IEE Wiring Regulation Basic Summary and Tables

IEE Wiring Regulation Basic Summary and Tables DESIGN CURRENT

The Regulations indicate the following symbols for use when selecting cables:

Iz

is the current carrying capacity of the cable in the situation where it is installed

It

is the tabulated current for a single circuit at an ambient temperature of 30°C

Ib

is the design current, the actual current to be carried by the cable

In

is the rating of the protecting fuse or circuit breaker

I2

is the operating current for the fuse or circuit breaker (the current at which the fuse blows or the circuit breaker opens)

Ca

is the correction factor for ambient temperature

Cg

is the correction factor for grouping

Ci

is the correction factor for thermal insulation.

1. 1. - Calculate the expected (design) current in the circuit (Ib) 2. 2. - Choose the type and rating of protective device (fuse or circuit breaker) to be used (In) 3. 3. - Divide the protective device rated current by the ambient temperature ----- correction ---- correction factor (Ca) if ambient temperature differs from 30°C 4. 4. - Further divide by the grouping correction factor (Cg) 5. 5. - Divide again by the thermal insulation correction factor (CI) 6. 6. - Divide by the semi-enclosed fuse factor of 0.725 where applicable 7. 7. - The result is the rated current of the cable required, which must be chosen ----- from ---- from the appropriate tables Table 4.3 Correction factors to current rating for ambient temperature -------------- (Ca) (from (Ca) (from [Tables 4C1 and 4C2] of BS 7671: 1992) Ambient temperature

Type of insulation

(°C)

70°C p.v.c

85°C rubber

70°C m.i

105°C m.i

25

1.03 (1.03)

1.02 (1.02)

1.03 (1.03)

1.02 (1.02)

30

1.00 (1.00)

1.00 (1.00)

1.00 (1.00)

1.00 (1.00)

35

0.94 (0.97)

0.95 (0.97)

0.93 (0.96)

0.96 (0.98)

40

0.87 (0.94)

0.90 (0.95)

0.85 (0.93)

0.92 (0.96)

45

0.79 (0.91)

0.85 (0.93)

0.77 (0.89)

0.88 (0.93)

50

0.71 (0.97)

0.80 (0.91)

0.67 (0.86)

0.84 (0.91)

The Regulations indicate the following symbols for use when selecting cables:

Iz

is the current carrying capacity of the cable in the situation where it is installed

It

is the tabulated current for a single circuit at an ambient temperature of 30°C

Ib

is the design current, the actual current to be carried by the cable

In

is the rating of the protecting fuse or circuit breaker

I2

is the operating current for the fuse or circuit breaker (the current at which the fuse blows or the circuit breaker opens)

Ca

is the correction factor for ambient temperature

Cg

is the correction factor for grouping

Ci

is the correction factor for thermal insulation.

1. 1. - Calculate the expected (design) current in the circuit (Ib) 2. 2. - Choose the type and rating of protective device (fuse or circuit breaker) to be used (In) 3. 3. - Divide the protective device rated current by the ambient temperature ----- correction ---- correction factor (Ca) if ambient temperature differs from 30°C 4. 4. - Further divide by the grouping correction factor (Cg) 5. 5. - Divide again by the thermal insulation correction factor (CI) 6. 6. - Divide by the semi-enclosed fuse factor of 0.725 where applicable 7. 7. - The result is the rated current of the cable required, which must be chosen ----- from ---- from the appropriate tables Table 4.3 Correction factors to current rating for ambient temperature -------------- (Ca) (from (Ca) (from [Tables 4C1 and 4C2] of BS 7671: 1992) Ambient temperature

Type of insulation

(°C)

70°C p.v.c

85°C rubber

70°C m.i

105°C m.i

25

1.03 (1.03)

1.02 (1.02)

1.03 (1.03)

1.02 (1.02)

30

1.00 (1.00)

1.00 (1.00)

1.00 (1.00)

1.00 (1.00)

35

0.94 (0.97)

0.95 (0.97)

0.93 (0.96)

0.96 (0.98)

40

0.87 (0.94)

0.90 (0.95)

0.85 (0.93)

0.92 (0.96)

45

0.79 (0.91)

0.85 (0.93)

0.77 (0.89)

0.88 (0.93)

50

0.71 (0.97)

0.80 (0.91)

0.67 (0.86)

0.84 (0.91)

55

0.61 (0.84)

0.74 (0.88)

0.57 (0.79)

0.80 (0.89)

Table 4.4 - Correction factors for groups of cables Number of circuits

Correction factor Cg

-

Enclosed or clipped

Clipped to non-metallic surface

-

-

Touching

Spaced*

2

0.80

0.85

0.94

3

0.70

0.79

0.90

4

0.65

0.75

0.90

5

0.60

0.73

0.90

6

0.57

0.72

0.90

7

0.54

0.72

0.90

8

0.52

0.71

0.90

9

0.50

0.70

0.90

10

0.48

----------

0.90

* ‘Spaced’ means a gap between cables at least equal to cable diameter.

Table 4.5 - Derating factors (Ci) for cables up to 10mm² in cross-sectional area buried in thermal insulation. insulation. Length in insulation (mm)

Derating factor (Ci)

50

0.89

100

0.81

200

0.68

400

0.55

500 or more

0.50

Table 4.6 - Current ratings and volt drops for unsheathed single core p.v.c. insulated cables

Cross sectional area

In conduit in thermal insulation


In conduit on wall

In conduit on wall

Clipped direct

Clipped direct

Volt drop

Volt drop

(mm²)

(A)

(A)

(A)

(A)

(A)

(A)

(mV/A/m)

(mV/A/m)

-

2 cables

3 or 4 cables

2 cables

3 or 4 cables

2 cables

3 or 4 cables

2 cables

3 or 4 cables

1.0

11.0

10.5

13.5

12.0

15.5

14.0

44.0

38.0

1.5

14.5

13.5

17.5

15.5

20.0

18.0

29.0

25.0

2.5

19.5

18.0

24.0

21.0

27.0

25.0

18..0

15.0

4.0

26.0

24.0

32.0

28.0

37.0

33.0

11.0

9.5

6.0

34.0

31.0

41.0

36.0

47.0

43.0

7.3

6.4

10.0

46.0

42.0

57.0

50.0

65.0

59.0

4.4

3.8

16.0

61.0

56.0

76.0

68.0

87.0

79.0

2.8

2.4

Table 4.7 - Current ratings and volt drops for sheathed multi-core p.v.c.-insulated cables Cross sectional area



In conduit on wall

In conduit on wall

Clipped direct

Clipped direct

Volt drop

Volt drop

(mm²)

(A)

(A)

(A)

(A)

(A)

(A)

(mV/A/m)

(mV/A/m)

-

2 core

3 or 4 core

2 core

3 or 4 core

2 core

3 or 4 core

2 core

3 or 4 core

1.0

11.0

10.0

13.0

11.5

15.0

13.5

44.0

38.0

1.5

14.0

13.0

16.5

15.0

19.5

17.5

29.0

25.0

2.5

18.5

17.5

23.0

20.0

27.0

24.0

18.0

15.0

4.0

25.0

23.0

30.0

27.0

36.0

32.0

11.0

9.5

6.0

32.0

29.0

38.0

34.0

46.0

41.0

7.3

6.4

10.0

43.0

39.0

52.0

46.0

63.0

57.0

4.4

3.8

16.0

57.0

52.0

69.0

62.0

85.0

76.0

2.8

2.4

The volt drop may be calculated using the basic Ohm's law formula U = I x R U is the cable volt drop (V

where

I is the circuit current (A), and R is the circuit resistance

Maximum permissible volt drop is 4% of 240 V =

Maximum permissible volt drop is 4% of 415 V

(Ohms)

4 X 240 V 100

=

4 X 415V 100

= 9.6 V

= 16.6 V

Selection of cpc using Table 54.7 Table 54.7 of the Regulations simply tells us that: 1. For line conductors up to and including 16 mm 2 , the cpc should be at least the same size. 2. For sizes between 16 mm 2 and 35 mm 2 , the cpc should be at least 16 mm 2 . 3. For sizes of line conductor over 35 mm 2 , the cpc should be at least half this size.

Table 6.1 - Current demand of outlets Type of outlet

Assumed current demand

2 A socket outlet

At least 0.5A

Other socket outlets

Rated current

Lighting point

Connected load, with minimum of 100 W

Shaver outlet, bell transformer or any equipment of 5 W or less

May be neglected

Household cooker

10A + 30% of remainder + 5A for socket in cooker unit Table 6.2 - Allowance for diversity

Note the following abbreviations : X is the full load current of the largest appliance or circuit Y is the full load current of the second largest appliance or circuit Z is the full load current of the remaining appliances or circuits Type of premises

Type of final circuit Households

Small shops, stores, offices

Hotels, guest houses

Lighting

66% total demand

90% total demand

75% total demand

Heating and power

100% up to 10 A + 50% balance

100%X + 75%(Y+Z)

100%X + 80%Y + 60%Z

Cookers

10 A + 30% balance + 5 A for socket

100%X + 80%Y + 60%Z

100%X + 80%Y + 60%Z

100%X + 80%Y + 60%Z

100%X + 50%(Y+Z)

Motors (but not lifts)

Instantaneous water heaters

100%X + 100%Y + 25%Z

100%X + 100%Y + 25%Z

100%X + 100%Y + 25%Z

Thermostatic water heaters

100%

100%

100%

Floor warming installations

100%

100%

100%

Thermal storage heating

100%

100%

100%

Standard circuits

100%X + 40%(Y+Z)

100%X + 50%(Y+Z)

100%X + 50%(Y+Z)

Sockets and stationary equip.

100%X + 40%(Y+Z)

100%X + 75%(Y+Z)

100%X + 75%Y + 40%Z

SI System or Metric (Decimal) System

English System – British (Inches)

Current Carrying Capacity (in Amp)

Numbers of Wire and Thickness of each Wire(mm)

Area 2 (in mm )

Current Carrying Capacity (in Amp)

Numbers of Wire and Thickness of each Wire(Inch)

Area 2 (in Inch )

11 13 13 18 18 24 31 42 56 73 90 145

1/1.13 1/1.38 7/0.50 1/1.78 7/0.67 7/0.85 7/1.04 7/1.35 7/1.70 7/2.14 19/1.53 19/1.78

1 1.5 1.5 2.5 2.5 4 6 10 16 25 35 50

11 13

1/0.044 3/0.029

0.0015 0.002

16

3/0.036

0.003

21 28 34 43 56 66 77

7/0.029 7/0.036 7/0.044 7/0.052 7/0.064 19/0.044 19/0.052

0.0045 0.007 0.01 0.0145 0.0225 0.03 0.04

185 230

19/2.14 19/2.52

70 95

105 180

19/0.064 19/0.83

CB and conductor selection

Capacity

Main conductor size; Earth conductor Circuit breaker copper (mm2)

size (mm2)

capacity (A)

Up to 600 W

1.5

1.5

5

600 –1,200 W

1.5/2.5

1.5

10

1,200 –1,800 W

2.5/4

2.5

15

2.5

2.5

30/32

4.0

2.5

30/32

2.5

1.5

20

Air conditioner (1.5 tonne) 6.0

6.0

30/32

Cooker

6.0

6.0

30/32

Water heater

4.0

4.0

20

Ring circuit (floor area 100 m2)

A2 radial circuit (floor area 75 m2)

A3 radial circuit (floor area 50 m2)

0.06 0.1

Outlet point or

Assumed load

equipment

Socket outlet 2 A

0.5 A

Other socket outlets Rated current

Light outlet (per lamp holder)

Domestic cooker

Other stationary equipment

100 W

10 A, 30% remainder, and 5 A for auxiliary socket

BS current rating or normal current

Diversity factor

25%

50%

50%

Table 4D1A Single-core 70°C Thermoplastic Insulated Cables, Non-Armoured, with or without Sheath Ambient Temperature: 30°C Conductor Operating Temperature: 70°C Current-carrying Capacity (amperes): Conductor crosssectional area

Reference Method A (enclosed in conduit in thermally insulating wall etc.)

Reference Method B (enclosed in conduit on a wall or in trunking etc.)

Reference Method C (clipped direct)

2 cables, 3 or 4 cables, 2 cables, 3 or 4 2 cables, singlesingle-phase three-phase single-phase cables, phase a.c. or d.c. a.c. or d.c. a.c. a.c. or d.c. three-phase flat and touching a.c. 1

3 or 4 cables, three-phase a.c. flat and touching or trefoil

Reference Method F (in free air or on a perforated cable tray horizontal or vertical etc.) Touching

Spaced by one diameter

2 cables, 3 cables, 3 cables, single-phase three-phase three-phase a.c. or d.c. a.c. flat a.c. trefoil flat

2 cables, single-phase a.c. or d.c. or 3 cables three-phase a.c. flat Horizontal

Vertical

2

3

4

5

6

7

8

9

10

11

12

(mm )

(A)

(A)

(A)

(A)

(A)

(A)

(A)

(A)

(A)

(A)

(A)

1

11

10.5

13.5

12

15.5

14

-

-

-

-

-

1.5

14.5

13.5

17.5

15.5

20

18

-

-

-

-

-

2.5

20

18

24

21

27

25

-

-

-

-

-

4

26

24

32

28

37

33

-

-

-

-

-

6

34

31

41

36

47

43

-

-

-

-

-

10

46

42

57

50

65

59

-

-

-

-

-

16

61

59

76

68

87

79

-

-

-

-

-

25

80

73

101

89

114

104

131

114

110

146

130

35

99

89

125

110

141

129

162

143

137

181

162

50

119

108

151

134

182

167

196

174

167

219

197

70

151

136

192

171

234

214

251

225

216

281

254

95

182

164

232

207

284

261

304

275

264

341

311

120

210

188

269

239

330

303

352

321

308

396

362

150

240

216

300

262

381

349

406

372

356

456

419

185

273

245

341

296

436

400

463

427

409

521

480

240

321

286

400

346

515

472

546

507

485

615

569

300

367

328

458

394

594

545

629

587

561

709

659

400

-

-

546

467

694

634

754

689

656

852

795

500

-

-

626

533

792

723

868

789

749

982

920

630

-

-

720

611

904

826

1,005

905

855

1,138

1,070

800

-

-

-

-

1,030

943

1,086

1,020

971

1,265

1,188

1000

-

-

-

-

1,154

1,058

1,216

1,149

1,079

1,420

1,337

2

Note: For cables having flexible conductors, see adjustment factors for current-carrying capacity and voltage d rop.

Table 4D2A Multicore 70°C Thermoplastic Insulated and T hermoplastic Sheathed Cables, Non-Armoured Ambient Temperature: 30°C Conductor Operating Temperature: 70°C Current-carrying Capacity (amperes): Conductor Reference Method A (enclosed in crossconduit in thermally insulating wall sectional etc.) area 1 two-core 1 three-core cable* cable* singleor 1 four-core phase a.c. or cable, three-phase d.c. a.c.

Reference Method B (enclosed in conduit on a wall or in trunking etc.) 1 two-core cable* singlephase a.c. or d.c.

1 three-core cable* or 1 four-core cable, three-phase a.c.


1 two-core cable* singlephase a.c. or d.c.


Reference Method E (free air or on a perforated cable tray etc, horizontal or vertical) 1 two-core cable* singlephase a.c. or d.c.


95

182

164

232

207

284

261

304

275

264

341

311

120

210

188

269

239

330

303

352

321

308

396

362

150

240

216

300

262

381

349

406

372

356

456

419

185

273

245

341

296

436

400

463

427

409

521

480

240

321

286

400

346

515

472

546

507

485

615

569

300

367

328

458

394

594

545

629

587

561

709

659

400

-

-

546

467

694

634

754

689

656

852

795

500

-

-

626

533

792

723

868

789

749

982

920

630

-

-

720

611

904

826

1,005

905

855

1,138

1,070

800

-

-

-

-

1,030

943

1,086

1,020

971

1,265

1,188

1000

-

-

-

-

1,154

1,058

1,216

1,149

1,079

1,420

1,337

Note: For cables having flexible conductors, see adjustment factors for current-carrying capacity and voltage d rop.

Table 4D2A Multicore 70°C Thermoplastic Insulated and T hermoplastic Sheathed Cables, Non-Armoured Ambient Temperature: 30°C Conductor Operating Temperature: 70°C Current-carrying Capacity (amperes): Conductor Reference Method A (enclosed in crossconduit in thermally insulating wall sectional etc.) area 1 two-core 1 three-core cable* cable* singleor 1 four-core phase a.c. or cable, three-phase d.c. a.c.

1



Reference Method E (free air or on a perforated cable tray etc, horizontal or vertical)







5

6

7

8

9

2

3

4

(mm )

(A)

(A)

(A)

(A)

(A)

(A)

(A)

(A)

1

11

10

13

11.5

15

13.5

17

14.5

1.5

14

13

16.5

15

19.5

17.5

22

18.5

2.5

18.5

17.5

23

20

27

24

30

25

4

25

23

30

27

36

32

40

34

6

32

29

38

34

46

41

51

43

10

43

39

52

46

63

57

70

60

16

57

52

69

62

85

76

94

80

2

Note: * With or without protective conductor.

Table 4D2B Voltage Drop (per ampere per metre): Conductor cross-sectional area 1

Conductor Operating Temperature: 70oC

Two-core cable d.c.

Two-core cable single-phase a.c.

Three- or four-core cable, three-phase a.c.

2

3

4

(mm )

(mV/A/m)

(mV/A/m)

(mV/A/m)

1

44

44

38

1.5

29

29

25

2.5

18

18

15

4

11

11

9.5

6

7.3

7.3

6.4

10

4.4

4.4

3.8

16

2.8

2.8

2.4

2

1

2

3

4

5

6

7

8

9

(mm )

(A)

(A)

(A)

(A)

(A)

(A)

(A)

(A)

1

11

10

13

11.5

15

13.5

17

14.5

1.5

14

13

16.5

15

19.5

17.5

22

18.5

2.5

18.5

17.5

23

20

27

24

30

25

4

25

23

30

27

36

32

40

34

6

32

29

38

34

46

41

51

43

10

43

39

52

46

63

57

70

60

16

57

52

69

62

85

76

94

80

2

Note: * With or without protective conductor.

Table 4D2B Voltage Drop (per ampere per metre):

Conductor Operating Temperature: 70oC

Conductor cross-sectional area

Two-core cable d.c.



1

2

3

4

(mm )

(mV/A/m)

(mV/A/m)

(mV/A/m)

1

44

44

38

1.5

29

29

25

2.5

18

18

15

4

11

11

9.5

6

7.3

7.3

6.4

10

4.4

4.4

3.8

16

2.8

2.8

2.4

2

Table 4E1A Single-Core 90°C Thermosetting Insulated Cables, Non-Armoured, with or without Sheath Ambient Temperature: 30°C Conductor Operating Temperature: 90°C

Current-carrying Capacity (amperes):

Conductor crosssectional area

1



Reference Method C (clipped direct) Spaced by one cable diameter

3 or 4 2 cables, 3 or 4 cables, 2 cables, 2 cables, singlecables, single-phase three-phase single-phase phase a.c. or d.c. three-phase a.c. or d.c. a.c. a.c. or d.c. flat and touching a.c.


Reference Method F (in free air or on a perforated cable tray etc horizontal or vertical etc.)

Reference Method G (in free air)

Touching

Spaced by one cable diameter



Vertical

2

3

4

5

6

7

8

9

10

11

12

(mm )

(A)

(A)

(A)

(A)

(A)

(A)

(A)

(A)

(A)

(A)

(A)

1

14

13

17

15

19

17.5

-

-

-

-

-

1.5

19

17

23

20

25

23

-

-

-

-

-

2.5

26

23

31

28

34

31

-

-

-

-

-

4

35

31

42

37

46

41

-

-

-

-

-

6

45

40

54

48

59

54

-

-

-

-

-

10

61

54

75

66

81

74

-

-

-

-

-

16

81

73

100

88

109

99

-

-

-

-

-

25

106

95

133

117

143

130

161

141

135

182

161

35

131

117

164

144

176

161

200

176

169

226

2 01

50

158

141

198

175

228

209

242

216

207

275

2 46

70

200

179

253

222

293

268

310

279

268

353

3 18

2

Table 4E1A Single-Core 90°C Thermosetting Insulated Cables, Non-Armoured, with or without Sheath Ambient Temperature: 30°C Conductor Operating Temperature: 90°C




Reference Method C (clipped direct) Spaced by one cable diameter

3 or 4 2 cables, 3 or 4 cables, 2 cables, 2 cables, singlecables, single-phase three-phase single-phase phase a.c. or d.c. three-phase a.c. or d.c. a.c. a.c. or d.c. flat and touching a.c.

1


Reference Method F (in free air or on a perforated cable tray etc horizontal or vertical etc.)

Reference Method G (in free air)

Touching




3

4

5

6

7

8

9

10

11

12

(mm )

(A)

(A)

(A)

(A)

(A)

(A)

(A)

(A)

(A)

(A)

(A)

1

14

13

17

15

19

17.5

-

-

-

-

-

1.5

19

17

23

20

25

23

-

-

-

-

-

2.5

26

23

31

28

34

31

-

-

-

-

-

4

35

31

42

37

46

41

-

-

-

-

-

6

45

40

54

48

59

54

-

-

-

-

-

10

61

54

75

66

81

74

-

-

-

-

-

16

81

73

100

88

109

99

-

-

-

-

-

25

106

95

133

117

143

130

161

141

135

182

161

35

131

117

164

144

176

161

200

176

169

226

2 01

50

158

141

198

175

228

209

242

216

207

275

2 46

70

200

179

253

222

293

268

310

279

268

353

3 18

95

241

216

306

269

355

326

377

342

328

430

3 89

120

278

249

354

312

413

379

437

400

383

500

454

150

318

285

393

342

476

4036

504

464

444

577

5 27

185

362

324

449

384

545

500

575

533

510

661

605

240

424

380

528

450

644

590

679

634

607

781

719

300

486

435

603

514

743

681

783

736

703

902

833

400

-

-

683

584

868

793

940

868

823

1,085

1,008

500

-

-

783

666

990

904

1,083

998

946

1,253

1,169

630

-

-

900

764

1,130

1,033

1,254

1,151

1,088

1,454

1,362

800

-

-

-

-

1,288

1,179

1,358

1,275

1,214

1,581

1,485

1,000

-

-

-

-

1,443

1,323

1,520

1,436

1,349

1,775

1,671

Where it is intended to connect the cables in this table to equipment or accessories designed to operate at a temperature lower than the maximum operating temperature of the cable, the cables should be rated at the maximum operating temperature of the equipment or accessory (see Regulation 512.1.5).

2.

Where it is intended to group a cable in this table with other cables, the cable should be rated at the lowest of the maximum operating temperatures of any of the cables in the group (see Regulation 512.1.5).

3.

Vertical

2 2

1.


For cables having flexible conductors see section 2.4 of this appendix for adjustment factors for current-carrying capacity and voltage drop.

Table 4E1B Single-Core 90°C Thermosetting Insulated Cables, Non-Armoured, with or without Sheath o

Voltage Drop (per ampere per metre): 2 cables, single-ph ase a.c. Conductor Reference Methods C & F (clipped direct, cross2 cables, Reference Method on tray or free air) A & B (enclosed in sectional d.c. conduit or area Cables touching Cables spaced* trunking)

Conductor Operating Temperature: 90 C 3 or 4 cables, three-ph ase a.c. Reference Methods A & B (enclosed in conduit or trunking)

Reference Methods C, F & G (clipped direct, on tray or in free air) Cables touching, trefoil

Cables touching, flat

Cables spaced*, flat

1.

95

241

216

306

269

355

326

377

342

328

430

120

278

249

354

312

150

318

285

393

342

185

362

324

449

240

424

380

300

486

435

400

-

500 630

3 89

413

379

437

400

383

500

454

476

4036

504

464

444

577

5 27

384

545

500

575

533

510

661

605

528

450

644

590

679

634

607

781

719

603

514

743

681

783

736

703

902

833

-

683

584

868

793

940

868

823

1,085

1,008

-

-

783

666

990

904

1,083

998

946

1,253

1,169

-

-

900

764

1,130

1,033

1,254

1,151

1,088

1,454

1,362

800

-

-

-

-

1,288

1,179

1,358

1,275

1,214

1,581

1,485

1,000

-

-

-

-

1,443

1,323

1,520

1,436

1,349

1,775

1,671

Where it is intended to connect the cables in this table to equipment or accessories designed to operate at a temperature lower than the maximum operating temperature of the cable, the cables should be rated at the maximum operating temperature of the equipment or accessory (see Regulation 512.1.5).

2.


3.


Table 4E1B Single-Core 90°C Thermosetting Insulated Cables, Non-Armoured, with or without Sheath o

Voltage Drop (per ampere per metre):

Conductor Operating Temperature: 90 C

2 cables, single-ph ase a.c. Conductor Reference Methods C & F (clipped direct, cross2 cables, Reference Method on tray or free air) A & B (enclosed in sectional d.c. conduit or area Cables touching Cables spaced* trunking)

1

3 or 4 cables, three-ph ase a.c. Reference Methods A & B (enclosed in conduit or trunking)

Reference Methods C, F & G (clipped direct, on tray or in free air) Cables touching, trefoil

Cables touching, flat

Cables spaced*, flat

8

9

40 27 16 10 6.8 4.0 2.5

40 27 16 10 6.8 4.0 2.5

2

3

4

5

6

7

(mm )

(mV/A/m)

(mV/A/m)

(mV/A/m)

(mV/A/m)

(mV/A/m)

(mV/A/m)

1 1.5 2.5 4 6 10 16

46 31 19 12 7.9 4.7 2.9

46 31 19 12 7.9 4.7 2.9

46 31 19 12 7.9 4.7 2.9

46 31 19 12 7.9 4.7 2.9

40 27 16 10 6.8 4.0 2.5

40 27 16 10 6.8 4.0 2.5

25 35 50 70 95 120 150 185 240 300 400 500 630 800 1,000

1.85 1.35 0.99 0.68 0.49 0.39 0.32 0.25 0.190 0.155 0.120 0.093 0.072 0.056 0.045

2

r

x

z

r

x

z

r

x

z

r

x

z

r

x

z

r

x

z

r

x

z

1.85 0.31 1.90 1.85 0.190 1.85 1.85 0.28 1.85 1.60 0.27 1.65 1.60 1.165 1.60 1.6 0 0.190 1.60 1.60 0.27 1.65 1.35 0.29 1.35 1.35 0.180 1.35 1.35 0.27 1.35 1.15 0.25 1.15 1.15 0.155 1.15 1.1 5 0.180 1.15 1.15 0.26 1.20 1.00 0.29 1.05 0.99 0.180 1.00 0.99 0.27 1.00 0.87 0.25 0.90 0.86 0.155 0.87 0.8 6 0.180 0.87 0.86 0.26 0.89 0.70 0.28 0.75 0.68 0.175 0.71 0.68 0.26 0.73 0.60 0.24 0.65 0.59 0.150 0.61 0.5 9 0.175 0.62 0.59 0.25 0.65 0.51 0.27 0.58 0.49 0.170 0.52 0.49 0.26 0.56 0.44 0.23 0.50 0.43 0.145 0.45 0.4 3 0.170 0.46 0.43 0.25 0.49 0.41 0.26 0.48 0.39 0.165 0.43 0.39 0.25 0.47 0.35 0.23 0.42 0.34 0.140 0.37 0.3 4 0.165 0.38 0.34 0.24 0.42 0.33 0.26 0.43 0.32 0.165 0.36 0.32 0.25 0.41 0.29 0.23 0.37 0.28 0.140 0.31 0.2 8 0.165 0.32 0.28 0.24 0.37 0.27 0.26 0.37 0.26 0.165 0.30 0.25 0.25 0.36 0.23 0.23 0.32 0.22 0.140 0.26 0.2 2 0.165 0.28 0.22 0.24 0.33 0.21 0.26 0.33 0.20 0.160 0.25 0.195 0.25 0.31 0.185 0.22 0.29 0.170 0.140 0.22 0.170 0.165 0.24 0.170 0.24 0.29 0.175 0.25 0.31 0.160 0.160 0.22 0.155 0.25 0.29 0.150 0.22 0.27 0.140 0.140 0.195 0.135 0.160 0.21 0.135 0.24 0.27 0.140 0.25 0.29 0.130 0.155 0.20 0.125 0.24 0.27 0.125 0.22 0.25 0.110 0.135 0.175 0.110 0.160 0.195 0.110 0.24 0.26 0.120 0.25 0.28 0.105 0.155 0.185 0.098 0.24 0.26 0.100 0.22 0.24 0.090 0.135 0.160 0.088 0.160 0.180 0.085 0.24 0.25 0.100 0.25 0.27 0.086 0.155 0.175 0.078 0.24 0.25 0.088 0.21 0.23 0.074 0.135 0.150 0.071 0.160 0.170 0.068 0.23 0.24 0.072 0.150 0.170 0.064 0.24 0.25 0.062 0.130 0.145 0.059 0.155 0.165 0.055 0.23 0.24 0.063 0.150 0.165 0.054 0.24 0.24 0.055 0.130 0.140 0.050 0.155 0.165 0.047 0.23 0.24

2

3

4

5

6

7

(mm )

1

(mV/A/m)

(mV/A/m)

(mV/A/m)

(mV/A/m)

(mV/A/m)

(mV/A/m)

1 1.5 2.5 4 6 10 16

46 31 19 12 7.9 4.7 2.9

46 31 19 12 7.9 4.7 2.9

46 31 19 12 7.9 4.7 2.9

46 31 19 12 7.9 4.7 2.9

40 27 16 10 6.8 4.0 2.5

40 27 16 10 6.8 4.0 2.5

25 35 50 70 95 120 150 185 240 300 400 500 630 800 1,000

1.85 1.35 0.99 0.68 0.49 0.39 0.32 0.25 0.190 0.155 0.120 0.093 0.072 0.056 0.045

2

r

x

z

r

x

z

r

x

z

r

x

z

r

x

z

r

8

9

40 27 16 10 6.8 4.0 2.5

40 27 16 10 6.8 4.0 2.5

x

z

r

x

Table 4E2A Multi-Core 90°C Thermosetting Insulated Cables and thermoplastic Sheathed Cables, Non-Armoured

Ambient Temperature: 30°C Conductor Operating Temperature: 90°C



1

Reference Method A

Reference Method B

(enclosed in conduit in thermally insulating wall etc.)

(enclosed in conduit on a wall or in trunking etc.)


Reference Method E (free air or on a perforated cable tray etc horizontal or vertical)

1 two-core 1 three- or four1 two-core 1 three- or four1 two-core 1 three- or four1 two-core 1 three- or fourcable*, singlecore cable*, cable*, singlecore cable*, cable*, singlecore cable*, cable*, singlecore cable*, phase a.c. or d.c. three-phase a.c. phase a.c. or d.c. three-phase a.c. phase a.c. or d.c. three-phase a.c. phase a.c. or d.c. three-phase a.c. 2

3

4

5

6

7

8

9

(mm )

(A)

(A)

(A)

(A)

(A)

(A)

(A)

(A)

1

14.5

13

17

15

19

14

21

18

1.5

18.5

16.5

22

19.5

24

22

26

23

2

z

1.85 0.31 1.90 1.85 0.190 1.85 1.85 0.28 1.85 1.60 0.27 1.65 1.60 1.165 1.60 1.6 0 0.190 1.60 1.60 0.27 1.65 1.35 0.29 1.35 1.35 0.180 1.35 1.35 0.27 1.35 1.15 0.25 1.15 1.15 0.155 1.15 1.1 5 0.180 1.15 1.15 0.26 1.20 1.00 0.29 1.05 0.99 0.180 1.00 0.99 0.27 1.00 0.87 0.25 0.90 0.86 0.155 0.87 0.8 6 0.180 0.87 0.86 0.26 0.89 0.70 0.28 0.75 0.68 0.175 0.71 0.68 0.26 0.73 0.60 0.24 0.65 0.59 0.150 0.61 0.5 9 0.175 0.62 0.59 0.25 0.65 0.51 0.27 0.58 0.49 0.170 0.52 0.49 0.26 0.56 0.44 0.23 0.50 0.43 0.145 0.45 0.4 3 0.170 0.46 0.43 0.25 0.49 0.41 0.26 0.48 0.39 0.165 0.43 0.39 0.25 0.47 0.35 0.23 0.42 0.34 0.140 0.37 0.3 4 0.165 0.38 0.34 0.24 0.42 0.33 0.26 0.43 0.32 0.165 0.36 0.32 0.25 0.41 0.29 0.23 0.37 0.28 0.140 0.31 0.2 8 0.165 0.32 0.28 0.24 0.37 0.27 0.26 0.37 0.26 0.165 0.30 0.25 0.25 0.36 0.23 0.23 0.32 0.22 0.140 0.26 0.2 2 0.165 0.28 0.22 0.24 0.33 0.21 0.26 0.33 0.20 0.160 0.25 0.195 0.25 0.31 0.185 0.22 0.29 0.170 0.140 0.22 0.170 0.165 0.24 0.170 0.24 0.29 0.175 0.25 0.31 0.160 0.160 0.22 0.155 0.25 0.29 0.150 0.22 0.27 0.140 0.140 0.195 0.135 0.160 0.21 0.135 0.24 0.27 0.140 0.25 0.29 0.130 0.155 0.20 0.125 0.24 0.27 0.125 0.22 0.25 0.110 0.135 0.175 0.110 0.160 0.195 0.110 0.24 0.26 0.120 0.25 0.28 0.105 0.155 0.185 0.098 0.24 0.26 0.100 0.22 0.24 0.090 0.135 0.160 0.088 0.160 0.180 0.085 0.24 0.25 0.100 0.25 0.27 0.086 0.155 0.175 0.078 0.24 0.25 0.088 0.21 0.23 0.074 0.135 0.150 0.071 0.160 0.170 0.068 0.23 0.24 0.072 0.150 0.170 0.064 0.24 0.25 0.062 0.130 0.145 0.059 0.155 0.165 0.055 0.23 0.24 0.063 0.150 0.165 0.054 0.24 0.24 0.055 0.130 0.140 0.050 0.155 0.165 0.047 0.23 0.24

2.5

25

22

30

26

33

30

36

32

4

33

30

40

35

45

40

49

42

6

42

38

51

44

58

52

63

54

10

57

51

69

60

80

71

86

75

16

76

68

91

80

107

96

11 5

100

25

99

89

119

105

138

119

149

127

35

121

1 09

146

128

171

1 47

18 5

1 58

50

145

1 30

175

154

209

1 79

22 5

1 92

70

183

1 64

221

194

269

2 29

28 9

2 46

95

220

1 97

265

233

328

2 78

35 2

2 98

120

253

227

305

268

382

322

410

346

Table 4E2A Multi-Core 90°C Thermosetting Insulated Cables and thermoplastic Sheathed Cables, Non-Armoured

Ambient Temperature: 30°C Conductor Operating Temperature: 90°C



Reference Method A

Reference Method B

(enclosed in conduit in thermally insulating wall etc.)

(enclosed in conduit on a wall or in trunking etc.)


Reference Method E (free air or on a perforated cable tray etc horizontal or vertical)

1 two-core 1 three- or four1 two-core 1 three- or four1 two-core 1 three- or four1 two-core 1 three- or fourcable*, singlecore cable*, cable*, singlecore cable*, cable*, singlecore cable*, cable*, singlecore cable*, phase a.c. or d.c. three-phase a.c. phase a.c. or d.c. three-phase a.c. phase a.c. or d.c. three-phase a.c. phase a.c. or d.c. three-phase a.c. 2

3

4

5

6

7

8

9

(mm )

1

(A)

(A)

(A)

(A)

(A)

(A)

(A)

(A)

2

1

14.5

13

17

15

19

14

21

18

1.5

18.5

16.5

22

19.5

24

22

26

23

2.5

25

22

30

26

33

30

36

32

4

33

30

40

35

45

40

49

42

6

42

38

51

44

58

52

63

54

10

57

51

69

60

80

71

86

75

16

76

68

91

80

107

96

11 5

100

25

99

89

119

105

138

119

149

127

35

121

1 09

146

128

171

1 47

18 5

1 58

50

145

1 30

175

154

209

1 79

22 5

1 92

70

183

1 64

221

194

269

2 29

28 9

2 46

95

220

1 97

265

233

328

2 78

35 2

2 98

120

253

227

305

268

382

322

410

346

150

290

259

334

300

441

371

473

399

185

329

295

384

340

506

424

542

456

240

386

346

459

398

599

500

641

538

300

442

396

532

455

693

576

741

621

400

-

-

625

536

803

667

865

741

Notes: * With or without a protective conductor 1.

Where it is intended to connect the cables in this table to equipment or accessories designed to operate at a temperature lower than the maximum operating temperature of the cable, the cables should b e rated at the maximum operating temperature of the equipment or accessory (see Regulation 512.1.5).

2.


3.


Table 4E2B Conductor Operating Temperature: 90 oC

Voltage Drop (per ampere per metre): Conductor cross-sectional area 1

Two-core cable d.c.



2

3

4

(mm )

(mV/A/m)

(mV/A/m)

(mV/A/m)

1

46

46

40

1.5

31

31

27

2.5

19

19

16

4

12

12

10

6

7.9

7.9

6.8

10

4.7

4.7

4.0

2

150

290

259

334

300

441

371

473

399

185

329

295

384

340

506

424

542

456

240

386

346

459

398

599

500

641

538

300

442

396

532

455

693

576

741

621

400

-

-

625

536

803

667

865

741

Notes: * With or without a protective conductor 1.

Where it is intended to connect the cables in this table to equipment or accessories designed to operate at a temperature lower than the maximum operating temperature of the cable, the cables should b e rated at the maximum operating temperature of the equipment or accessory (see Regulation 512.1.5).

2.


3.



Voltage Drop (per ampere per metre): Conductor cross-sectional area

Two-core cable d.c.

1



2

3

4

(mm )

(mV/A/m)

(mV/A/m)

(mV/A/m)

1

46

46

40

1.5

31

31

27

2

2.5

19

19

16

4

12

12

10

6

7.9

7.9

6.8

10

4.7

4.7

4.0

16

2.9

2.9

2.5

r

x

z

r

x

z

25

1.85

1.85

0.160

1.90

1.60

0.140

1.65

35

1.35

1.35

0.155

1.35

1.15

0.135

1.15

50

0.98

0.99

0.155

1.00

0.86

0.135

0.87

70

0.67

0.67

0.150

0.69

0.59

0.130

0.60

95

0.49

0.50

0.150

0.52

0.43

0.130

0.45

120

0.39

0.40

0.145

0.42

0.34

0.130

0.37

150

0.31

0.32

0.145

0.35

0.28

0.125

0.30

185

0.25

0.26

0.145

0.29

0.22

0.125

0.26

240

0.195

0.200

0.140

0.24

0.175

0.125

0.21

300

0.155

0.160

0.140

0.21

0.140

0.120

0.185

400

0.120

0.130

0.140

0.190

0.115

0.120

0.165

Table 4E3A Single-Core Armoured 90°C Thermosetting Insulated Cables, Non-Magnetic Armour Ambient Temperature: 30°C Conductor Operating Temperature: 90°C

Current-carrying Capacity (amperes): Conductor crossssectional area

1


Reference Method F (in free air or on a perforated cable tray, horizontal or vertical)

Touching

Touching

2 cables, singlephase a.c. or d.c. flat

3 or 4 cables, three-phase a.c. flat


2

3

4


3 cables, three- 3 cables, threephase a.c. or phase a.c. or d.c. d.c. flat trefoil 5

6

2 cables, d.c.

2 cables, single-phase a.c.

3 or 4 cables, three-phase a.c.

Horizontal Vertical Horizontal Vertical Horizontal Vertical 7

8

9

10

11

12

16

2.9

2.9

2.5

r

x

z

r

x

z

25

1.85

1.85

0.160

1.90

1.60

0.140

1.65

35

1.35

1.35

0.155

1.35

1.15

0.135

1.15

50

0.98

0.99

0.155

1.00

0.86

0.135

0.87

70

0.67

0.67

0.150

0.69

0.59

0.130

0.60

95

0.49

0.50

0.150

0.52

0.43

0.130

0.45

120

0.39

0.40

0.145

0.42

0.34

0.130

0.37

150

0.31

0.32

0.145

0.35

0.28

0.125

0.30

185

0.25

0.26

0.145

0.29

0.22

0.125

0.26

240

0.195

0.200

0.140

0.24

0.175

0.125

0.21

300

0.155

0.160

0.140

0.21

0.140

0.120

0.185

400

0.120

0.130

0.140

0.190

0.115

0.120

0.165

Table 4E3A Single-Core Armoured 90°C Thermosetting Insulated Cables, Non-Magnetic Armour Ambient Temperature: 30°C Conductor Operating Temperature: 90°C

Current-carrying Capacity (amperes): Conductor crossssectional area


Reference Method F (in free air or on a perforated cable tray, horizontal or vertical)

Touching

Touching



3 or 4 cables, three-phase a.c. flat


2

3

4

5

6

7

8

9

10

11

12

(mm )

(A)

(A)

(A)

(A)

(A)

(A)

(A)

(A)

(A)

(A)

(A)

50

237

220

253

232

222

284

270

282

266

288

266

70

303

277

322

293

285

356

349

357

337

358

331

95

367

333

389

352

346

446

426

436

412

425

393

120

425

383

449

405

402

519

497

504

477

485

449

150

488

437

516

462

463

600

575

566

539

549

510

185

557

496

587

524

529

688

660

643

614

618

574

240

656

579

689

612

625

815

782

749

714

715

666

300

755

662

792

700

720

943

906

842

805

810

755

400

853

717

899

767

815

1,137

1,094

929

889

848

797

500

962

791

1,016

851

918

1,314

1,266

1,032

989

923

871

630

1,082

861

1,146

935

1,027

1,528

1,474

1,139

1,092

992

940

800

1,170

904

1,246

987

1,119

1,809

1,744

1,204

1,155

1,042

978

1,000

1,261

961

1,345

1,055

1,214

2,100

2,026

1,289

1,238

1,110

1,041

1

2

3 cables, three- 3 cables, threephase a.c. or phase a.c. or d.c. d.c. flat trefoil

2 cables, d.c.

2 cables, single-phase a.c.


Horizontal Vertical Horizontal Vertical Horizontal Vertical

Notes: 1.

Where it is intended to connect the cables in this table to equipment or accessories designed to operate at a temperature lower than the maximum operating temperature of the cable, the cables should be rated at the maximum operating temperature of the equip ment or accessory (see Regulation 512.1.5).

2.




2 cables, d.c.

Reference Methods C & F (clipped direct, on tray or free air) 2 cables, single-phase a.c. Touching

Spaced*

3 or 4 cables, three-phase a.c. Trefoil and touching

Flat and touching

Flat and spaced*

2

(mm )

(A)

(A)

(A)

(A)

(A)

(A)

(A)

(A)

(A)

(A)

(A)

50

237

220

253

232

222

284

270

282

266

288

266

70

303

277

322

293

285

356

349

357

337

358

331

95

367

333

389

352

346

446

426

436

412

425

393

120

425

383

449

405

402

519

497

504

477

485

449

150

488

437

516

462

463

600

575

566

539

549

510

185

557

496

587

524

529

688

660

643

614

618

574

240

656

579

689

612

625

815

782

749

714

715

666

300

755

662

792

700

720

943

906

842

805

810

755

400

853

717

899

767

815

1,137

1,094

929

889

848

797

500

962

791

1,016

851

918

1,314

1,266

1,032

989

923

871

630

1,082

861

1,146

935

1,027

1,528

1,474

1,139

1,092

992

940

800

1,170

904

1,246

987

1,119

1,809

1,744

1,204

1,155

1,042

978

1,000

1,261

961

1,345

1,055

1,214

2,100

2,026

1,289

1,238

1,110

1,041

Notes: 1.

Where it is intended to connect the cables in this table to equipment or accessories designed to operate at a temperature lower than the maximum operating temperature of the cable, the cables should be rated at the maximum operating temperature of the equip ment or accessory (see Regulation 512.1.5).

2.




2 cables, d.c.

Reference Methods C & F (clipped direct, on tray or free air) 2 cables, single-phase a.c. Touching

1 2

(mm )


Spaced*

Trefoil and touching

Flat and touching

Flat and spaced*

2

3

4

5

6

7

(mV/A/m)

(mV/A/m)

(mV/A/m)

(mV/A/m)

(mV/A/m)

(mV/A/m)

r

x

z

r

x

z

r

x

z

r

x

z

r

x

z

50

0.98

0.99

0.21

1.00

0.98

0.29 1.00

0.86

0.180

0.78

0.84

0.25

0.88

0.84

0.33

0.90

70

0.67

0.68

0.200

0.71

0.69

0.29 0.75

0.59

0.170

0.62

0.60

0.25

0.65

0.62

0.32

0.70

95

0.49

0.51

0.195

0.55

0.53

0.28 0.60

0.44

0.170

0.47

0.46

0.24

0.52

0.49

0.31

0.58

120

0.39

0.41

0.190

0.45

0.43

0.27 0.51

0.35

0.165

0.39

0.38

0.24

0.44

0.41

0.30

0.51

150

0.31

0.33

0.185

0.38

0.36

0.27 0.45

0.29

0.160

0.33

0.31

0.23

0.39

0.34

0.29

0.45

185

0.25

0.27

0.185

0.33

0.30

0.26 0.40

0.23

0.160

0.28

0.26

0.23

0.34

0.29

0.29

0.41

240

0.195

0.21

0.180

0.28

0.24

0.26 0.35 0.180 0.155

0.24

0.21

0.22

0.30

0.24

0.28

0.37

300

0.155

0.170 0.175

0.25

0.195 0.25 0.32 0.145 0.150

0.21

0.170

0.22

0.28

0.20

0.27

0.34

400

0.115

0.145 0.170

0.22

0.180 0.24 0.30 0.125 0.150 0.195 0.160

0.21

0.27

0.20

0.27

0.33

500

0.093

0.125 0.170

0.21

0.165 0.24 0.29 0.105 0.145 0.180 0.145

0.20

0.25 0.190

0.24

0.31

630

0.073

0.105 0.165 0.195 0.150 0.23 0.27 0.092 0.145 0.170 0.135 0.195 0.24 0.175

0.23

0.29

800

0.056

0.090 0.160 0.190 0.145 0.23 0.27 0.086 0.140 0.165 0.130 0.180 0.23 0.175 0.195 0.26

1,000

0.045

0.092 0.155 0.180 0.140 0.21 0.25 0.080 0.135 0.155 0.125 0.170 0.21 0.165 0.180 0.24

Note: * Spacings larger than one cable diameter will result in a larger voltage drop.

Table 4E4A Multicore 90°C Thermosetting Insulated Cables


Air Ambient Temperature: 30°C Ground Ambient Temperature: 20°C Conductor Operating Temperature: 90°C

2

3

4

5

6

7

(mm )

1

(mV/A/m)

(mV/A/m)

(mV/A/m)

(mV/A/m)

(mV/A/m)

(mV/A/m)

r

x

z

r

50

0.98

0.99

0.21

1.00

0.98

0.29 1.00

0.86

0.180

0.78

0.84

0.25

0.88

0.84

0.33

0.90

70

0.67

0.68

0.200

0.71

0.69

0.29 0.75

0.59

0.170

0.62

0.60

0.25

0.65

0.62

0.32

0.70

95

0.49

0.51

0.195

0.55

0.53

0.28 0.60

0.44

0.170

0.47

0.46

0.24

0.52

0.49

0.31

0.58

120

0.39

0.41

0.190

0.45

0.43

0.27 0.51

0.35

0.165

0.39

0.38

0.24

0.44

0.41

0.30

0.51

150

0.31

0.33

0.185

0.38

0.36

0.27 0.45

0.29

0.160

0.33

0.31

0.23

0.39

0.34

0.29

0.45

185

0.25

0.27

0.185

0.33

0.30

0.26 0.40

0.23

0.160

0.28

0.26

0.23

0.34

0.29

0.29

0.41

240

0.195

0.21

0.180

0.28

0.24

0.26 0.35 0.180 0.155

0.24

0.21

0.22

0.30

0.24

0.28

0.37

300

0.155

0.170 0.175

0.25

0.195 0.25 0.32 0.145 0.150

0.21

0.170

0.22

0.28

0.20

0.27

0.34

400

0.115

0.145 0.170

0.22

0.180 0.24 0.30 0.125 0.150 0.195 0.160

0.21

0.27

0.20

0.27

0.33

500

0.093

0.125 0.170

0.21

0.165 0.24 0.29 0.105 0.145 0.180 0.145

0.20

0.25 0.190

0.24

0.31

630

0.073

0.105 0.165 0.195 0.150 0.23 0.27 0.092 0.145 0.170 0.135 0.195 0.24 0.175

0.23

0.29

800

0.056

0.090 0.160 0.190 0.145 0.23 0.27 0.086 0.140 0.165 0.130 0.180 0.23 0.175 0.195 0.26

1,000

0.045

0.092 0.155 0.180 0.140 0.21 0.25 0.080 0.135 0.155 0.125 0.170 0.21 0.165 0.180 0.24

2

x

z

r

x

z

r

x

z

r

x

z

Note: * Spacings larger than one cable diameter will result in a larger voltage drop.

Table 4E4A Multicore 90°C Thermosetting Insulated Cables Air Ambient Temperature: 30°C Ground Ambient Temperature: 20°C Conductor Operating Temperature: 90°C


Conductor crosssectional area 1

Reference Method C (clipped direct) 1 two-core cable single-phase a.c. or d.c.

1 three-or 1 four-core cable, three-phase a.c.

Reference Method E (in free air or on a perforated cable tray etc, horizontal or vertical) 1 two-core cable single-phase a.c. or d.c.


Reference Method D (direct in ground or in ducting in ground, in or around buildings) 1 two-core cable single-phase a.c. or d.c.


2

3

4

5

6

7

(mm )

2

(A)

(A)

(A)

(A)

(A)

(A)

1.5

27

23

29

25

25

21

2.5

36

31

39

33

33

28

4

49

42

52

44

46

36

6

62

53

66

56

53

44

10

85

73

90

78

71

58

16

110

94

115

99

91

75

25

146

124

152

131

116

96

35

180

154

188

162

139

115

50

219

187

228

197

164

135

70

279

238

291

251

203

167

95

338

289

354

304

239

197

120

392

335

410

353

271

223

150

451

386

472

406

306

251

185

515

441

539

463

343

281

240

607

520

636

546

395

324

300

698

599

732

628

446

365

400

787

673

847

728

-

-

Notes:

Reference Method E (in free air or on a perforated cable tray etc, horizontal or vertical)



1 two-core cable single-phase a.c. or d.c.

1


1 two-core cable single-phase a.c. or d.c.


Reference Method D (direct in ground or in ducting in ground, in or around buildings) 1 two-core cable single-phase a.c. or d.c.


2

3

4

5

6

7

(mm )

2

(A)

(A)

(A)

(A)

(A)

(A)

1.5

27

23

29

25

25

21

2.5

36

31

39

33

33

28

4

49

42

52

44

46

36

6

62

53

66

56

53

44

10

85

73

90

78

71

58

16

110

94

115

99

91

75

25

146

124

152

131

116

96

35

180

154

188

162

139

115

50

219

187

228

197

164

135

70

279

238

291

251

203

167

95

338

289

354

304

239

197

120

392

335

410

353

271

223

150

451

386

472

406

306

251

185

515

441

539

463

343

281

240

607

520

636

546

395

324

300

698

599

732

628

446

365

400

787

673

847

728

-

-

Notes:

1.

Where it is intended to connect the cables in this table to equipment or accessories designed to operate at a temperature lower than the maximum operating temperature of the cable, the cables should be rated at the maximum operating temperature of the equi pment or accessory (see Regulation 512.1.5).

2.


Table 4E4B Voltage Drop (per ampere per metre): Conductor cross-sectional area 1

Conductor Operating Temperature: 90°C

Two-core cable d.c.

Two-core cable, single-phase a.c.


2

3

4

(mm )

(mV/A/m)

(mV/A/m)

(mV/A/m)

1.5

31

31

27

2

2.5

19

19

16

4

12

12

10

6

7.9

7.9

6.8

10

4.7

4.7

4.0

16

2.9

2.9

2.5

r

x

z

r

x

z

25

1.85

1.85

0.160

1.90

1.60

0.140

1.65

35

1.35

1.35

0.155

1.35

1.15

0.135

1.15

50

0.98

0.99

0.155

1.00

0.86

0.135

0.87

70

0.67

0.67

0.150

0.69

0.59

0.130

0.60

95

0.49

0.50

0.150

0.52

0.43

0.130

0.45

120

0.39

0.40

0.145

0.42

0.34

0.130

0.37

150

0.31

0.32

0.145

0.35

0.28

0.125

0.30

1.

Where it is intended to connect the cables in this table to equipment or accessories designed to operate at a temperature lower than the maximum operating temperature of the cable, the cables should be rated at the maximum operating temperature of the equi pment or accessory (see Regulation 512.1.5).

2.


Table 4E4B Voltage Drop (per ampere per metre): Conductor cross-sectional area 1


Two-core cable d.c.



2

3

4

(mm )

(mV/A/m)

(mV/A/m)

(mV/A/m)

1.5

31

31

27

2.5

19

19

16

2

4

12

12

10

6

7.9

7.9

6.8

10

4.7

4.7

4.0

16

2.9

2.9

2.5

r

x

z

r

x

z

25

1.85

1.85

0.160

1.90

1.60

0.140

1.65

35

1.35

1.35

0.155

1.35

1.15

0.135

1.15

50

0.98

0.99

0.155

1.00

0.86

0.135

0.87

70

0.67

0.67

0.150

0.69

0.59

0.130

0.60

95

0.49

0.50

0.150

0.52

0.43

0.130

0.45

120

0.39

0.40

0.145

0.42

0.34

0.130

0.37

150

0.31

0.32

0.145

0.35

0.28

0.125

0.30

185

0.25

0.26

0.145

0.29

0.22

0.125

0.26

240

0.195

0.20

0.140

0.24

0.175

0.125

0.21

300

0.155

0.16

0.140

0.21

0.140

0.120

0.185

400

0.120

0.13

0.140

0.190

0.115

0.120

0.165

Table 4F1A 60°C Thermosetting Insulated Flexible Cables with Sheath, Non-Armoured Ambient Temperature: 30°C Conductor Operating Temperature: 60°C

Current-carrying Capacity (amperes): Conductor cross-sectional area

1

Three-phase a.c.

Single-phase a.c. or d.c.

1 two-core cable, with or without protective conductor

1 three-core, four-core or five-core

2 single-core cable

2

3

4

(mm )

(A)

(A)

(A)

4

30

26

-

6

39

34

-

10

51

47

-

16

73

63

-

25

97

83

-

35

-

102

140

50

-

124

175

70

-

158

216

95

-

192

258

2

Notes:


185

0.25

0.26

0.145

0.29

0.22

0.125

0.26

240

0.195

0.20

0.140

0.24

0.175

0.125

0.21

300

0.155

0.16

0.140

0.21

0.140

0.120

0.185

400

0.120

0.13

0.140

0.190

0.115

0.120

0.165

Table 4F1A 60°C Thermosetting Insulated Flexible Cables with Sheath, Non-Armoured Ambient Temperature: 30°C Conductor Operating Temperature: 60°C

Current-carrying Capacity (amperes): Conductor cross-sectional area


Three-phase a.c.




2 single-core cable

2

3

4

(mm )

1

(A)

(A)

(A)

4

30

26

-

2

6

39

34

-

10

51

47

-

16

73

63

-

25

97

83

-

35

-

102

140

50

-

124

175

70

-

158

216

95

-

192

258

Notes:

1.

The current ratings tabulated are for cables in free air but may also be used for cables resting on a surface. If the cable is to be wou nd on a drum on l oad the ratings should be reduced in accordance with Note 2 below and for cables which may be covered, Note 3 below.

2.

Flexible cables wound on reeling drums The current ratings of cables used on reeling drums are to be reduced by the following factors: a) Radial type drum b) Ventilated cylindrical type drum ventilated: 85% 1 layer of cable: 85% unventilated: 75% 2 layers of cable: 65% 3 layers of cable: 45% 4 layers of cable: 35%A radial type drum is one where spiral layers of cable are accommodated between closely spaced flanges; if fitted with solid flanges the ratings given above should be reduced and the drum is described as non-v entilated. If the flanges have suitable apertures the drum is described as ventilated. A ventilated cylindrical cable drum is on e where layers of cable are accommodated between widely spaced flang es and the drum an d end flanges have suitable ventilating apertures.

3.

Where cable may be covered over or coiled up whilst on load, or the air movement over the cable restricted, the current rating should be reduced. It is no t possible to specify the amount of reduction but the table of rating factors for reeling drums can be used as a guide.

Table 4F1B

60°C Thermosetting Insulated Flexible Cables Voltage Drop (per ampere per metre): Conductor cross-sectional area 1

Conductor Operating Temperature: 60°C Two-core cable d.c.

Two-core cable, singlephase a.c.

1 three-core, four-core or five-core cable, three-phase a.c.

2 single-core cables, touching d.c.

Single-phase a.c.*

2

3

4

5

6

(mm )

(mV/A/m)

(mV/A/m)

(mV/A/m)

(mV/A/m)

(mV/A/m)

4

12

12

10

-

-

2

1.

The current ratings tabulated are for cables in free air but may also be used for cables resting on a surface. If the cable is to be wou nd on a drum on l oad the ratings should be reduced in accordance with Note 2 below and for cables which may be covered, Note 3 below.

2.

Flexible cables wound on reeling drums The current ratings of cables used on reeling drums are to be reduced by the following factors: a) Radial type drum b) Ventilated cylindrical type drum ventilated: 85% 1 layer of cable: 85% unventilated: 75% 2 layers of cable: 65% 3 layers of cable: 45% 4 layers of cable: 35%A radial type drum is one where spiral layers of cable are accommodated between closely spaced flanges; if fitted with solid flanges the ratings given above should be reduced and the drum is described as non-v entilated. If the flanges have suitable apertures the drum is described as ventilated. A ventilated cylindrical cable drum is on e where layers of cable are accommodated between widely spaced flang es and the drum an d end flanges have suitable ventilating apertures.

3.

Where cable may be covered over or coiled up whilst on load, or the air movement over the cable restricted, the current rating should be reduced. It is no t possible to specify the amount of reduction but the table of rating factors for reeling drums can be used as a guide.

Table 4F1B

60°C Thermosetting Insulated Flexible Cables Voltage Drop (per ampere per metre):



Two-core cable d.c.

1

Two-core cable, singlephase a.c.


2 single-core cables, touching d.c.

Single-phase a.c.*

2

3

4

5

6

(mm )

(mV/A/m)

(mV/A/m)

(mV/A/m)

(mV/A/m)

(mV/A/m)

4

12

12

10

-

-

2

6

7.8

7.8

6.7

-

-

10

4.6

4.6

4.0

-

-

16

2.9

2.9

2.5

-

r

x

z

r

x

z

r

x

z

-

-

-

25

1.80

1.80

0.175

1.85

1.55

0.150

1.55

-

35

-

-

-

-

1.10

0.150

1.15

1.31

1.31 0.21 1.32

50

-

-

-

-

0.83

0.145

0.84

0.91

0.91 0.21 0.93

70

-

-

-

-

0.57

0.140

0.58

0.64

0.64 0.20 0.67

95

-

-

-

-

0.42

0.135

0.44

0.49

0.49 0.195 0.53

Note: * A larger voltage drop will result if the cables are spaced.

Table 4F2A 90°C and 180°C Thermosetting Insulated Flexible Cables with Sheath, Non-Armoured (Copper Conductors) Ambient Temperature: 30°C Current-carrying Capacity (amperes): Conductor cross-sectional area

1

Conductor Operating Temperature: 90°C Single-phase a.c. or d.c.

Three-phase a.c.




2 single-core cables, touching

2

3

4

(mm )

(A)

(A)

(A)

4

42

37

-

6

55

49

-

2

6

7.8

7.8

6.7

-

-

10

4.6

4.6

4.0

-

-

16

2.9

2.9

2.5

-

-

r

x

z

r

x

z

25

1.80

1.80

0.175

1.85

1.55

0.150

1.55

-

35

-

-

-

-

1.10

0.150

1.15

1.31

1.31 0.21 1.32

50

-

-

-

-

0.83

0.145

0.84

0.91

0.91 0.21 0.93

70

-

-

-

-

0.57

0.140

0.58

0.64

0.64 0.20 0.67

95

-

-

-

-

0.42

0.135

0.44

0.49

0.49 0.195 0.53

r

x

z

-

-

-

Note: * A larger voltage drop will result if the cables are spaced.

Table 4F2A 90°C and 180°C Thermosetting Insulated Flexible Cables with Sheath, Non-Armoured (Copper Conductors) Ambient Temperature: 30°C Current-carrying Capacity (amperes): Conductor cross-sectional area

Conductor Operating Temperature: 90°C Single-phase a.c. or d.c.

Three-phase a.c.




2 single-core cables, touching

2

3

4

(mm )

1

(A)

(A)

(A)

4

42

37

-

6

55

49

-

10

76

66

-

16

103

89

-

25

136

119

-

35

-

146

200

50

-

146

200

50

-

177

250

70

-

225

310

2

95

-

273

369

120

-

316

432

150

-

363

497

185

-

414

567

240

-

487

673

300

-

560

773

400

-

-

924

500

-

-

1,062

630

-

-

1,242

Rating Factor for Ambient Temperature 90°C Thermoplastic or Thermosetting Insulated Cords: Ambient Temperature:

35°C

40°C

45°C

50°C

55°C

60°C

65°C

70°C

75°C

80°C

85°C

Correction Factor:

0.95

0.91

0.86

0.82

0.76

0.70

0.64

0.57

0.50

0.40

0.28

35°C to90°C

95°C

100°C

105°C

110°C

150°C

120°C

125°C

130°C

135°C

1.0

0.96

0.91

0.86

0.81

0.76

0.70

0.64

0.57

0.50

180°C Thermosetting Insulated Cords: Ambient Temperature: Correction Factor:

10

76

66

-

16

103

89

-

25

136

119

-

35

-

146

200

50

-

146

200

50

-

177

250

70

-

225

310

95

-

273

369

120

-

316

432

150

-

363

497

185

-

414

567

240

-

487

673

300

-

560

773

400

-

-

924

500

-

-

1,062

630

-

-

1,242

Rating Factor for Ambient Temperature 90°C Thermoplastic or Thermosetting Insulated Cords: Ambient Temperature:

35°C

40°C

45°C

50°C

55°C

60°C

65°C

70°C

75°C

80°C

85°C

Correction Factor:

0.95

0.91

0.86

0.82

0.76

0.70

0.64

0.57

0.50

0.40

0.28

35°C to90°C

95°C

100°C

105°C

110°C

150°C

120°C

125°C

130°C

135°C

1.0

0.96

0.91

0.86

0.81

0.76

0.70

0.64

0.57

0.50

180°C Thermosetting Insulated Cords: Ambient Temperature: Correction Factor:

Ambient Temperature:

140°C

145°C

0.40

0.28

Correction Factor: Notes: 1.

The current ratings tabulated are for cables in free air but may also be used for cables resting on a surface. If the cabl e is to be woun d on a drum on load the ratings should be reduced in accordance with Note 2 below and for cables which may be covered, Note 3 below.

2.

Flexible cables wound on reeling drums The current ratings of cables used on reeling drums are to be reduced by the following factors: a) Radial type drum b) Ventilated cylindrical type drum ventilated: 85% 1 layer of cable: 85% unventilated: 75% 2 layers of cable: 65% 3 layers of cable: 45% 4 layers of cable: 35% A radial type drum is one wh ere spiral layers of cable are accommodated between closely spaced fl anges; if fitted with solid flanges the ratings given above should be reduced and the drum is described as non-ventilated. If the flanges have suitable apertures the drum is described as ventilated. A ventilated cylindrical cable drum is on e where layers of cable are accommodated between widely spaced flang es and the drum and end flanges have suitable ventilating apertures.

3.

Where cable may be covered over or coiled up whilst on load, or the air movement over the cable restricted, the current ratin g should be reduced. It is n ot possible to specify the amount of reduction but the table of rating factors for reeling drums can be used as a guide.

4.

For 180oC cables, the rating factors for ambient temperature allow a conductor operating temperature up to 150oC. Consult the cable manufacturer for further information.

5.

Where it is intended to connect the cab les in this table to equip ment or accessories designed to operate at a temperature lower than the maximum operating temperature of the cable, the cables should be rated at the maximum operating temperature of the equipment or accessory (see Regulations 512.1.5).

6.

Where it is intended to group a cable in this table with other cables, the cable should be rated at the lowest of the maximum operating temperatures of any of the cables in the group (see Regulations 512.1.5).


140°C

145°C

0.40

0.28

Correction Factor: Notes: 1.

The current ratings tabulated are for cables in free air but may also be used for cables resting on a surface. If the cabl e is to be woun d on a drum on load the ratings should be reduced in accordance with Note 2 below and for cables which may be covered, Note 3 below.

2.

Flexible cables wound on reeling drums The current ratings of cables used on reeling drums are to be reduced by the following factors: a) Radial type drum b) Ventilated cylindrical type drum ventilated: 85% 1 layer of cable: 85% unventilated: 75% 2 layers of cable: 65% 3 layers of cable: 45% 4 layers of cable: 35% A radial type drum is one wh ere spiral layers of cable are accommodated between closely spaced fl anges; if fitted with solid flanges the ratings given above should be reduced and the drum is described as non-ventilated. If the flanges have suitable apertures the drum is described as ventilated. A ventilated cylindrical cable drum is on e where layers of cable are accommodated between widely spaced flang es and the drum and end flanges have suitable ventilating apertures.

3.

Where cable may be covered over or coiled up whilst on load, or the air movement over the cable restricted, the current ratin g should be reduced. It is n ot possible to specify the amount of reduction but the table of rating factors for reeling drums can be used as a guide.

4.

For 180oC cables, the rating factors for ambient temperature allow a conductor operating temperature up to 150oC. Consult the cable manufacturer for further information.

5.

Where it is intended to connect the cab les in this table to equip ment or accessories designed to operate at a temperature lower than the maximum operating temperature of the cable, the cables should be rated at the maximum operating temperature of the equipment or accessory (see Regulations 512.1.5).

6.

Where it is intended to group a cable in this table with other cables, the cable should be rated at the lowest of the maximum operating temperatures of any of the cables in the group (see Regulations 512.1.5).

Table 4F2B Voltage Drop (per ampere per metre): Conductor cross-sectional area 1

Conductor Operating Temperature: 90°C 1 two-core or 2 single-core cables d.c.



2 single-core cables touching Single-phase a.c.*

2

3

4

6

(mm )

(mV/A/m)

(mV/A/m)

(mV/A/m)

(mV/A/m)

4

13.2

13.2

11.1

-

6

8.5

8.5

7.4

-

10

5.1

5.1

4.4

-

16

3.2

3.2

2.7

-

r

x

z

r

x

z

r

x

z

25

2.03

2.03

0.175

2.04

1.73

0.15

1.73

-

-

-

35

1.42

-

-

-

1.22

0.15

1.23

1.44

0.21

1.46

50

1.00

-

-

-

0.91

0.145

0.93

1.00

0.21

1.02

70

0.71

-

-

-

0.62

0.14

0.64

0.71

0.20

0.73

2

95

0.54

-

-

-

0.47

0.135

0.49

0.54

0.195

0.57

120

0.42

-

-

-

0.37

0.135

0.39

0.42

0.190

0.46

150

0.34

-

-

-

0.29

0.130

0.32

0.34

0.190

0.39

185

0.27

-

-

-

0.24

0.130

0.27

0.27

0.190

0.33

240

0.21

-

-

-

0.188

0.130

0.23

0.21

0.185

0.28

300

0.167

-

-

-

0.147

0.125

0.195

0.173 0.180

0.25

400

0.127

-

-

-

-

-

-

0.132 0.175

0.22

Table 4F2B Voltage Drop (per ampere per metre):



1 two-core or 2 single-core cables d.c.

1



2 single-core cables touching Single-phase a.c.*

2

3

4

6

(mm )

(mV/A/m)

(mV/A/m)

(mV/A/m)

(mV/A/m)

4

13.2

13.2

11.1

-

6

8.5

8.5

7.4

-

10

5.1

5.1

4.4

-

16

3.2

2

3.2

2.7

-

r

x

z

r

x

z

r

x

z

25

2.03

2.03

0.175

2.04

1.73

0.15

1.73

-

-

-

35

1.42

-

-

-

1.22

0.15

1.23

1.44

0.21

1.46

50

1.00

-

-

-

0.91

0.145

0.93

1.00

0.21

1.02

70

0.71

-

-

-

0.62

0.14

0.64

0.71

0.20

0.73

95

0.54

-

-

-

0.47

0.135

0.49

0.54

0.195

0.57

120

0.42

-

-

-

0.37

0.135

0.39

0.42

0.190

0.46

150

0.34

-

-

-

0.29

0.130

0.32

0.34

0.190

0.39

185

0.27

-

-

-

0.24

0.130

0.27

0.27

0.190

0.33

240

0.21

-

-

-

0.188

0.130

0.23

0.21

0.185

0.28

300

0.167

-

-

-

0.147

0.125

0.195

0.173 0.180

0.25

400

0.127

-

-

-

-

-

-

0.132 0.175

0.22

500

0.100

-

-

-

-

-

-

0.107 0.170

0.20

630

0.074

-

-

-

-

-

-

0.085 0.170 0.190

Notes: 1.

The voltge drop figures given above are based on a conductor operating temperature of 9 0°C and are therefore not accurate when the opera ting temperature is in excess of 90°C. In the case of the 180°C cables with a conductor temperature of 15 0°C the above resistive values should be increased by a factor of 1.2.

2.

*A larger voltage drop will result if the cables are spaced.

Table 4F3A Flexible Cords, Non-Armoured Conductor cross-sectional area 1

Current-carry ing capacity Single-phase a.c.

Three-phase a.c.

Maximum mass supporta ble by twin flexible cord (see Regulations 522.7.2 and 559.6.1.5)

2

3

4

(mm )

(A)

(A)

(kg)

0.5

3

3

2

2

0.75

6

6

3

1

10

10

5

1.25

13

-

5

1.5

16

16

5

2.5

25

20

5

4

32

25

5

Where cable is on a reel see the no tes to the table in 4F1A.

Rating Factor for Ambient Temperature 60°C Thermoplastic or Thermosetting Insulated Cords:

500

0.100

-

-

-

-

-

-

0.107 0.170

0.20

630

0.074

-

-

-

-

-

-

0.085 0.170 0.190

Notes: 1.

The voltge drop figures given above are based on a conductor operating temperature of 9 0°C and are therefore not accurate when the opera ting temperature is in excess of 90°C. In the case of the 180°C cables with a conductor temperature of 15 0°C the above resistive values should be increased by a factor of 1.2.

2.

*A larger voltage drop will result if the cables are spaced.

Table 4F3A Flexible Cords, Non-Armoured Conductor cross-sectional area

Current-carry ing capacity Single-phase a.c.

1

Maximum mass supporta ble by twin flexible cord (see Regulations 522.7.2 and 559.6.1.5)

Three-phase a.c.

2

3

4

(mm )

(A)

(A)

(kg)

0.5

3

3

2

0.75

6

6

3

2

1

10

10

5

1.25

13

-

5

1.5

16

16

5

2.5

25

20

5

4

32

25

5

Where cable is on a reel see the no tes to the table in 4F1A.

Rating Factor for Ambient Temperature 60°C Thermoplastic or Thermosetting Insulated Cords:


35°C

40°C

45°C

50°C

55°C

Correction Factor:

0.91

0.82

0.71

0.58

0.41

35°C to 50°C

55°C

60°C

65°C

70°C

1.0

0.96

0.83

0.67

0.47

35°C to 120°C

125°C

130°C

135°C

140°C

145°C

1.0

0.96

0.85

0.74

0.60

0.42

35°C to 150°C

155°C

160°C

165°C

170°C

175°C

1.0

0.92

0.82

0.71

0.51

0.40

90°C Thermoplastic or Thermosetting Insulated Cords: Ambient Temperature: Correction Factor: 180oC Thermosetting Insulated Cords: Ambient Temperature: Correction Factor: Glass Fibre Cords: Ambient Temperature: Correction Factor:

Table 4F3B Voltage Drop (per ampere per meter):

Conductor Operating Temperature: 60°C*


d.c. or single-phase a.c.

1

2

3

(mm )

(mV/A/m)

(mV/A/m)

0.5

93

80

0.75

62

54

2

Three-phase a.c.

1

46

40

1.25

37

-

1.5

32

27


35°C

40°C

45°C

50°C

55°C

Correction Factor:

0.91

0.82

0.71

0.58

0.41

35°C to 50°C

55°C

60°C

65°C

70°C

1.0

0.96

0.83

0.67

0.47

35°C to 120°C

125°C

130°C

135°C

140°C

145°C

1.0

0.96

0.85

0.74

0.60

0.42

35°C to 150°C

155°C

160°C

165°C

170°C

175°C

1.0

0.92

0.82

0.71

0.51

0.40

90°C Thermoplastic or Thermosetting Insulated Cords: Ambient Temperature: Correction Factor: 180oC Thermosetting Insulated Cords: Ambient Temperature: Correction Factor: Glass Fibre Cords: Ambient Temperature: Correction Factor:

Table 4F3B Voltage Drop (per ampere per meter):

Conductor Operating Temperature: 60°C*


d.c. or single-phase a.c.

1

2

3

(mm )

(mV/A/m)

(mV/A/m)

0.5

93

80

0.75

62

54

2

Three-phase a.c.

1

46

40

1.25

37

-

1.5

32

27

2.5

19

16

4

12

10

Note: * The tabulated values above are for 60°C thermoplastic or thermosetting insulated flexible cables and for other types of flexible cable they are to be multiplied by the following factors: For 90°C thermoplastic or thermosetting insulated 1.09 150°C 1.31 185°C glass fibre 1.43

AWG/Metric Conversion American Wire Gauge to Metric Conversion – Listed below are some of the most popular strandings, however, many other combinations exist. Resistance figures are approximate and are given for guidance only. 2

AWG

Cross section mm

Stranding

Resistance Ohm/km

38

0.008

1 x 0.10

2,125

38

0.009

7 x 0.04

1,930

36

0.013

1 x 0.12

1,360

36

0.014

7 x 0.05

1,217

34

0.020

1 x 0.16

856

34

0.022

7 x 0.06

777

32

0.032

1 x 0.20

538

32

0.034

7 x 0.08

538

32

0.035

19 x 0.05

446

30

0.051

1 x 0.25

338

30

0.057

7 x 0.10

338

2.5

19

16

4

12

10

Note: * The tabulated values above are for 60°C thermoplastic or thermosetting insulated flexible cables and for other types of flexible cable they are to be multiplied by the following factors: For 90°C thermoplastic or thermosetting insulated 1.09 150°C 1.31 185°C glass fibre 1.43

AWG/Metric Conversion American Wire Gauge to Metric Conversion – Listed below are some of the most popular strandings, however, many other combinations exist. Resistance figures are approximate and are given for guidance only. 2

AWG

Cross section mm

Stranding

Resistance Ohm/km

38

0.008

1 x 0.10

2,125

38

0.009

7 x 0.04

1,930

36

0.013

1 x 0.12

1,360

36

0.014

7 x 0.05

1,217

34

0.020

1 x 0.16

856

34

0.022

7 x 0.06

777

32

0.032

1 x 0.20

538

32

0.034

7 x 0.08

538

32

0.035

19 x 0.05

446

30

0.051

1 x 0.25

338

30

0.057

7 x 0.10

338

30

0.059

19 x 0.06

286

28

0.080

1 x 0.32

213

28

0.089

7 x 0.12

213

28

0.090

19 x 0.08

186

26

0.128

1 x 0.40

134

26

0.141

7 x 0.16

122

26

0.155

19 x 0.10

113

24

0.205

1 x 0.51

84

24

0.227

7 x 0.20

76

24

0.241

19 x 0.12

69

22

0.324

1 x 0.64

53

22

0.355

1 x 0.25

48

22

0.382

19 x 0.16

45

20

0.519

1 x 0.81

33

20

0.563

7 x 0.32

30.4

20

0.616

19 x 0.20

28.3

18

0.785

16 x 0.25

21.2

18

0.823

1 x 1.02

20.9

18

0.90

7 x 0.40

19.2

18

0.96

19 x 0.25

17.9

16

1.30

1 x 1.29

13.2

16

1.23

19 x 0.28

14.0

14

2.08

1 x 1.62

8.28

14

1.94

19 x 0.36

8.86

30

0.059

19 x 0.06

286

28

0.080

1 x 0.32

213

28

0.089

7 x 0.12

213

28

0.090

19 x 0.08

186

26

0.128

1 x 0.40

134

26

0.141

7 x 0.16

122

26

0.155

19 x 0.10

113

24

0.205

1 x 0.51

84

24

0.227

7 x 0.20

76

24

0.241

19 x 0.12

69

22

0.324

1 x 0.64

53

22

0.355

1 x 0.25

48

22

0.382

19 x 0.16

45

20

0.519

1 x 0.81

33

20

0.563

7 x 0.32

30.4

20

0.616

19 x 0.20

28.3

18

0.785

16 x 0.25

21.2

18

0.823

1 x 1.02

20.9

18

0.90

7 x 0.40

19.2

18

0.96

19 x 0.25

17.9

16

1.30

1 x 1.29

13.2

16

1.23

19 x 0.28

14.0

14

2.08

1 x 1.62

8.28

14

1.94

19 x 0.36

8.86

12

3.31

1 x 2.05

5.20

12

3.08

19 x 0.45

5.58

10

5.26

1 x 2.58

3.28

10

5.26

19 x 0.6

3.28

8

8.38

1 x 3.26

2.06

8

8.35

19 x 0.75

2.06

6

13.29

1 x 4.11

1.59

6

13.29

19 x 0.96

1.59

4

21.15

1 x 5.18

0.815

4

21.14

19 x 1.19

0.815

2

33.63

1 x 6.54

0.513

2

33.61

19 x 1.50

0.513

1

42.41

1 x 7.34

0.424

1

42.38

19 x 1.68

0.424

1/0

53.4

19 x 1.89

0.253

2/0

67.4

19 x 2.17

0.291

4/0

107

19 x 2.68

0.182

250MCM

127

37 x 2.09

0.139

300MCM

152

37 x 2.29

0.119

350MCM

177

37 x 2.47

0.102

400MCM

202

37 x 2.64

0.091

500MCM

253

37 x 2.95

0.072

12

3.31

1 x 2.05

5.20

12

3.08

19 x 0.45

5.58

10

5.26

1 x 2.58

3.28

10

5.26

19 x 0.6

3.28

8

8.38

1 x 3.26

2.06

8

8.35

19 x 0.75

2.06

6

13.29

1 x 4.11

1.59

6

13.29

19 x 0.96

1.59

4

21.15

1 x 5.18

0.815

4

21.14

19 x 1.19

0.815

2

33.63

1 x 6.54

0.513

2

33.61

19 x 1.50

0.513

1

42.41

1 x 7.34

0.424

1

42.38

19 x 1.68

0.424

1/0

53.4

19 x 1.89

0.253

2/0

67.4

19 x 2.17

0.291

4/0

107

19 x 2.68

0.182

250MCM

127

37 x 2.09

0.139

300MCM

152

37 x 2.29

0.119

350MCM

177

37 x 2.47

0.102

400MCM

202

37 x 2.64

0.091

500MCM

253

37 x 2.95

0.072

Stranding Chart Cross section 2 mm

Nearest AWG size*

Stranding Stranding class Resistance Ohm/km class 1 2 classes 1&2

Stranding class 5

Stranding class 6

Resistance Ohm/km classes 5&6

Approx weight kg/km

IEC 60228/BS 6360 Conductors for insulated cables

0.14

26

-

-

-

-

18 x 0.10

138

1.35

0.25

24

-

-

-

14 x 0.16

32 x 0.10

79

2.4

0.34

22

-

-

-

19 x 0.16

42 x 0.10

57

3.3

0.50

20

1 x 0.80

7 x 0.30

36.0

16 x 0.21

28 x 0.16

38

4.8

0.75

18

1 x 0.97

7 x 0.37

24.5

24 x 0.21

42 x 0.16

26

7.2

1.0

18

1 x 1.13

7 x 0.43

18.1

32 x 0.21

56 x 0.16

19.5

9.6

1.5

16

1 x 1.38

7 x 0.53

12.1

30 x 0.26

84 x 0.16

13.3

14.4

2.5

14

1 x 1.78

7 x 0.67

7.41

50 x 0.26

140 x 0.16

7.98

24

4.0

12

1 x 2.26

7 x 0.85

4.61

56 x 0.31

224 x 0.16

4.95

38

6.0

10

1 x 2.76

7 x 1.04

3.08

84 x 0.31

192 x 0.21

3.3

58

10

8

1 x 3.57

7 x 1.35

1.83

80 x 0.41

320 x 0.21

1.91

96

16

6

1 x 4.5

17 x 1.70

1.15

128 x 0.41

512 x 0.21

1.21

154

25

4

-

7 x 2.14

0.72

200 x 0.41

800 x 0.21

0.78

240

35

2

-

7 x 2.52

0.52

280 x 0.41

1,120 x 0.21

0.55

336

50

1/0

-

19 x 1.78

0.39

400 x 0.41

705 x 0.31

0.39

480

70

2/0

-

19 x 2.14

0.27

356 x 0.51

990 x 0.31

0.27

672

95

3/0

-

19 x 2.52

0.19

485 x 0.51

1,340 x 0.31

0.21

912

120

250MCM

-

37 x 2.03

0.15

614 x 0.51

1,690 x 0.31

0.16

1,152

150

300MCM

-

37 x 2.25

0.12

765 x 0.51

2,123 x 0.31

0.13

1,440

Stranding Chart Cross section 2 mm

Nearest AWG size*

Stranding Stranding class Resistance Ohm/km class 1 2 classes 1&2

Stranding class 5

Stranding class 6

Resistance Ohm/km classes 5&6

Approx weight kg/km

IEC 60228/BS 6360 Conductors for insulated cables

0.14

26

-

-

-

-

18 x 0.10

138

1.35

0.25

24

-

-

-

14 x 0.16

32 x 0.10

79

2.4

0.34

22

-

-

-

19 x 0.16

42 x 0.10

57

3.3

0.50

20

1 x 0.80

7 x 0.30

36.0

16 x 0.21

28 x 0.16

38

4.8

0.75

18

1 x 0.97

7 x 0.37

24.5

24 x 0.21

42 x 0.16

26

7.2

1.0

18

1 x 1.13

7 x 0.43

18.1

32 x 0.21

56 x 0.16

19.5

9.6

1.5

16

1 x 1.38

7 x 0.53

12.1

30 x 0.26

84 x 0.16

13.3

14.4

2.5

14

1 x 1.78

7 x 0.67

7.41

50 x 0.26

140 x 0.16

7.98

24

4.0

12

1 x 2.26

7 x 0.85

4.61

56 x 0.31

224 x 0.16

4.95

38

6.0

10

1 x 2.76

7 x 1.04

3.08

84 x 0.31

192 x 0.21

3.3

58

10

8

1 x 3.57

7 x 1.35

1.83

80 x 0.41

320 x 0.21

1.91

96

16

6

1 x 4.5

17 x 1.70

1.15

128 x 0.41

512 x 0.21

1.21

154

25

4

-

7 x 2.14

0.72

200 x 0.41

800 x 0.21

0.78

240

35

2

-

7 x 2.52

0.52

280 x 0.41

1,120 x 0.21

0.55

336

50

1/0

-

19 x 1.78

0.39

400 x 0.41

705 x 0.31

0.39

480

70

2/0

-

19 x 2.14

0.27

356 x 0.51

990 x 0.31

0.27

672

95

3/0

-

19 x 2.52

0.19

485 x 0.51

1,340 x 0.31

0.21

912

120

250MCM

-

37 x 2.03

0.15

614 x 0.51

1,690 x 0.31

0.16

1,152

150

300MCM

-

37 x 2.25

0.12

765 x 0.51

2,123 x 0.31

0.13

1,440

185

400MCM

-

37 x 2.52

0.1

944 x 0.51

1,470 x 0.41

0.11

1,776

240

500MCM

-

61 x 2.25

0.07

1,225 x 0.51

1,905 x 0.41

0.08

2,304

300

600MCM

-

61 x 2.52

0.06

1,530 x 0.51

2,385 x 0.41

0.064

2,880

400

750MCM

-

61 x 2.85

0.05

2,035 x 0.51

-

0.068

3,840

500

1,000MCM

-

61 x 3.20

0.04

1,768 x 0.60

-

0.0384

4,800

Notes: The number of strands according to IEC 60228/BS 6360 shown in classes 1 & 2 is obligatory. Stranding shown in classes 5 & 6 gives the maximum strand diameters and may have less strands provided the conductor do es not exceed the resistance figures shown. In either case the standard gives the maxi mum resistance in ohms/km that is permissable for non-tinned conductors. * AWG sizes are approximate and for i nformation only. Please contact us for exact sizing .

BS 5308 Colour Codes BS 5308 Part 1 Colour Code Table 1 Unscreened & Collective Screened Pair no.

A – wire

B – wire

1

Black

Blue

2

Black

Green

3

Blue

Green

4

Black

Brown

5

Blue

Brown

6

Green

Brown

7

Black

White

8

Blue

White

9

Green

White

185

400MCM

-

37 x 2.52

0.1

944 x 0.51

1,470 x 0.41

0.11

1,776

240

500MCM

-

61 x 2.25

0.07

1,225 x 0.51

300

600MCM

-

61 x 2.52

0.06

1,530 x 0.51

1,905 x 0.41

0.08

2,304

2,385 x 0.41

0.064

2,880

400

750MCM

-

61 x 2.85

0.05

2,035 x 0.51

-

0.068

3,840

500

1,000MCM

-

61 x 3.20

0.04

1,768 x 0.60

-

0.0384

4,800

Notes: The number of strands according to IEC 60228/BS 6360 shown in classes 1 & 2 is obligatory. Stranding shown in classes 5 & 6 gives the maximum strand diameters and may have less strands provided the conductor do es not exceed the resistance figures shown. In either case the standard gives the maxi mum resistance in ohms/km that is permissable for non-tinned conductors. * AWG sizes are approximate and for i nformation only. Please contact us for exact sizing .

BS 5308 Colour Codes BS 5308 Part 1 Colour Code Table 1 Unscreened & Collective Screened Pair no.

A – wire

B – wire

1

Black

Blue

2

Black

Green

3

Blue

Green

4

Black

Brown

5

Blue

Brown

6

Green

Brown

7

Black

White

8

Blue

White

9

Green

White

10

Brown

White

11

Black

Red

12

Blue

Red

13

Green

Red

14

Brown

Red

15

White

Red

16

Black

Orange

17

Blue

Orange

18

Green

Orange

19

Brown

Orange

20

White

Orange

21

Red

Orange

22

Black

Yellow

23

Blue

Yellow

24

Green

Yellow

25

Brown

Yellow

26

White

Yellow

27

Red

Yellow

28

Orange

Yellow

29

Black

Grey

30

Blue

Grey

31

Green

Grey

32

Brown

Grey

33

White

Grey

10

Brown

White

11

Black

Red

12

Blue

Red

13

Green

Red

14

Brown

Red

15

White

Red

16

Black

Orange

17

Blue

Orange

18

Green

Orange

19

Brown

Orange

20

White

Orange

21

Red

Orange

22

Black

Yellow

23

Blue

Yellow

24

Green

Yellow

25

Brown

Yellow

26

White

Yellow

27

Red

Yellow

28

Orange

Yellow

29

Black

Grey

30

Blue

Grey

31

Green

Grey

32

Brown

Grey

33

White

Grey

34

Red

Grey

35

Orange

Grey

36

Yellow

Grey

37

Black

Grey

38

Blue

Grey

39

Green

Violet

40

Brown

Violet

41

White

Violet

42

Red

Violet

43

Orange

Violet

44

Yellow

Violet

45

Grey

Violet

46

Black

Turquoise

47

Blue

Turquoise

48

Green

Turquoise

49

Brown

Turquoise

50

White

Turquoise

sSingle Quad (2 pair): Black, Blue, Green, Brown Single Triple: Blue, Black, Green Individually screened pairs can also be identified by a polyester tape over black and purple pairs.

BS 5308 Part 2 Colour Code Table 2 Unscreened & Collective Screened Pair no.

A – wire

B – wire

1

White

Blue

34

Red

Grey

35

Orange

Grey

36

Yellow

Grey

37

Black

Grey

38

Blue

Grey

39

Green

Violet

40

Brown

Violet

41

White

Violet

42

Red

Violet

43

Orange

Violet

44

Yellow

Violet

45

Grey

Violet

46

Black

Turquoise

47

Blue

Turquoise

48

Green

Turquoise

49

Brown

Turquoise

50

White

Turquoise

sSingle Quad (2 pair): Black, Blue, Green, Brown Single Triple: Blue, Black, Green Individually screened pairs can also be identified by a polyester tape over black and purple pairs.

BS 5308 Part 2 Colour Code Table 2 Unscreened & Collective Screened Pair no.

A – wire

B – wire

1

White

Blue

2

White

Orange

3

White

Green

4

White

Brown

5

White

Grey

6

Red

Blue

7

Red

Orange

8

Red

Green

9

Red

Brown

10

Red

Grey

11

Black

Blue

12

Black

Orange

13

Black

Green

14

Black

Brown

15

Black

Grey

16

Yellow

Blue

17

Yellow

Orange

18

Yellow

Green

19

Yellow

Brown

20

Yellow

Grey

21

White-Blue

Blue

22

White-Blue

Orange

23

White-Blue

Green

24

White-Blue

Brown

25

White-Blue

Grey

2

White

Orange

3

White

Green

4

White

Brown

5

White

Grey

6

Red

Blue

7

Red

Orange

8

Red

Green

9

Red

Brown

10

Red

Grey

11

Black

Blue

12

Black

Orange

13

Black

Green

14

Black

Brown

15

Black

Grey

16

Yellow

Blue

17

Yellow

Orange

18

Yellow

Green

19

Yellow

Brown

20

Yellow

Grey

21

White-Blue

Blue

22

White-Blue

Orange

23

White-Blue

Green

24

White-Blue

Brown

25

White-Blue

Grey

26

Red-Blue

Blue

27

Red-Blue

Orange

28

Red-Blue

Green

29

Red-Blue

Brown

30

Red-Blue

Grey

31

Blue-Black

Blue

32

Blue-Black

Orange

33

Blue-Black

Green

34

Blue-Black

Brown

35

Blue-Black

Grey

36

Yellow-Blue

Blue

37

Yellow-Blue

Orange

38

Yellow-Blue

Green

39

Yellow-Blue

Brown

40

Yellow-Blue

Grey

41

White Orange

Blue

42

White Orange

Orange

43

White Orange

Green

44

White Orange

Brown

45

White Orange

Grey

46

Orange-Red

Blue

47

Orange-Red

Orange

48

Orange-Red

Green

49

Orange-Red

Brown

26

Red-Blue

Blue

27

Red-Blue

Orange

28

Red-Blue

Green

29

Red-Blue

Brown

30

Red-Blue

Grey

31

Blue-Black

Blue

32

Blue-Black

Orange

33

Blue-Black

Green

34

Blue-Black

Brown

35

Blue-Black

Grey

36

Yellow-Blue

Blue

37

Yellow-Blue

Orange

38

Yellow-Blue

Green

39

Yellow-Blue

Brown

40

Yellow-Blue

Grey

41

White Orange

Blue

42

White Orange

Orange

43

White Orange

Green

44

White Orange

Brown

45

White Orange

Grey

46

Orange-Red

Blue

47

Orange-Red

Orange

48

Orange-Red

Green

49

Orange-Red

Brown

50

Orange-Red

Grey

Single Quad (2 pair): Blue, Green, Orange, Brown Single Triple: Blue, White, Orange Individually screened pairs can also be identified by a polyester tape over white and blue pairs.

Harmonised Cable Core Colours 1 Introduction The requirements of BS 7671 were harmonized with the technical intent of CENELEC Standard HD 384.5.514: Identification, including 514.3: Identification of conductors, now withdrawn. Amendment No 2: 2004 (AMD 14905) to BS 7671:2001 implemented the following: The harmonized cable core colours and the alphanumeric marking of the following standards: HD 308 S2:2001 Identification of cores in cables and flexible cords BS EN 60445:2000 Basic and safety principles for man-machine interface, marking and identification of equipment terminals and of terminations BS EN 60446:2000 Basic and safety principles for man-machine interface, marking and identification. Identification of conductors by colours or numerals. This appendix provides guidance on marking at the interface between old and harmonized colours and marking general guidance on the colours to be used for conductors. In the British Standards for fixed and flexible cables the colours have been harmonized. BS 7671 has been modified to align with these cables, but also allows other suitable methods of marking connections by colour (tapes, sleeves or discs), or by alphanumerics (letters and/or numbers). Methods may be mixed within an installation.

2 Addition or alteration to an existing installation 2.1 Single-phase installation An addition or an alteration made to a single-phase installation need not be marked at the interface provided that: i) the old cables are correctly identified by the colour red for line and black for neutral, and ii) the new cables are correctly identified by the colour brown for line and blue for neutral.

2.2 Two- or three-phase installation

50

Orange-Red

Grey

Single Quad (2 pair): Blue, Green, Orange, Brown Single Triple: Blue, White, Orange Individually screened pairs can also be identified by a polyester tape over white and blue pairs.

Harmonised Cable Core Colours 1 Introduction The requirements of BS 7671 were harmonized with the technical intent of CENELEC Standard HD 384.5.514: Identification, including 514.3: Identification of conductors, now withdrawn. Amendment No 2: 2004 (AMD 14905) to BS 7671:2001 implemented the following: The harmonized cable core colours and the alphanumeric marking of the following standards: HD 308 S2:2001 Identification of cores in cables and flexible cords BS EN 60445:2000 Basic and safety principles for man-machine interface, marking and identification of equipment terminals and of terminations BS EN 60446:2000 Basic and safety principles for man-machine interface, marking and identification. Identification of conductors by colours or numerals. This appendix provides guidance on marking at the interface between old and harmonized colours and marking general guidance on the colours to be used for conductors. In the British Standards for fixed and flexible cables the colours have been harmonized. BS 7671 has been modified to align with these cables, but also allows other suitable methods of marking connections by colour (tapes, sleeves or discs), or by alphanumerics (letters and/or numbers). Methods may be mixed within an installation.

2 Addition or alteration to an existing installation 2.1 Single-phase installation An addition or an alteration made to a single-phase installation need not be marked at the interface provided that: i) the old cables are correctly identified by the colour red for line and black for neutral, and ii) the new cables are correctly identified by the colour brown for line and blue for neutral.

2.2 Two- or three-phase installation

Where an addition or alteration is made to a two- or three-phase installation wired in the old core colours with cable to the new core colours, unambiguous identification is required at the interface. Cores should be marked as follows: Neutral conductors Old and new conductors: N Line conductors Old and new conductors: L1, L2, L3.

Table 7A – Example of conductor marking at the interface for additions and alterations to an a.c. installation identified with the old cable colours Function

Old conductor Colour

New conductor Marking Marking

Colour

Line 1 of a.c.

Red

L1

L1

Brown(1)

Line 2 of a.c.

Yellow

L2

L2

Black(1)

Line 3 of a.c.

Blue

L3

L3

Grey(1)

Neutral of a.c.

Black

N

N

Blue

Protective conductor Green-and-yellow

Green-and-yellow

3 Switch wires in a new installation or an addition or alteration to an existing installation Where a two-core cable with cores coloured brown and blue is used as switch wires, both conductors being line conductors, the blue conductor should be marked brown or L at its terminations.

4 Intermediate and two-way switch wires in a new installation or an addition or alteration to an existing installation Where a three-core cable with cores coloured brown, black and grey is used as switch wires, all three conductors being line conductors, the black and grey conductors should be marked brown or L at their terminations.

5 Line conductors in a new installation or an addition or alteration to an existing installation Power circuit line conductors should be coloured as in Table 51. Other line conductors may be brown, black , red, orange, yellow, violet, grey, white, pink or turquoise.

Where an addition or alteration is made to a two- or three-phase installation wired in the old core colours with cable to the new core colours, unambiguous identification is required at the interface. Cores should be marked as follows: Neutral conductors Old and new conductors: N Line conductors Old and new conductors: L1, L2, L3.

Table 7A – Example of conductor marking at the interface for additions and alterations to an a.c. installation identified with the old cable colours Function

Old conductor Colour

New conductor Marking Marking

Colour

Line 1 of a.c.

Red

L1

L1

Brown(1)

Line 2 of a.c.

Yellow

L2

L2

Black(1)

Line 3 of a.c.

Blue

L3

L3

Grey(1)

Neutral of a.c.

Black

N

N

Blue

Protective conductor Green-and-yellow

Green-and-yellow

3 Switch wires in a new installation or an addition or alteration to an existing installation Where a two-core cable with cores coloured brown and blue is used as switch wires, both conductors being line conductors, the blue conductor should be marked brown or L at its terminations.

4 Intermediate and two-way switch wires in a new installation or an addition or alteration to an existing installation Where a three-core cable with cores coloured brown, black and grey is used as switch wires, all three conductors being line conductors, the black and grey conductors should be marked brown or L at their terminations.

5 Line conductors in a new installation or an addition or alteration to an existing installation Power circuit line conductors should be coloured as in Table 51. Other line conductors may be brown, black , red, orange, yellow, violet, grey, white, pink or turquoise.

In a two- or three-phase power circuit the line conductors may all be of one of the permitted colours, either identified L1, L2, L3 or marked brown, black, grey at their terminations to show the phases.

6 Changes to cable core colour identification

Table 7B – Cable to BS 6004 (flat cable with bare cpc) Cable type

Old core colours

New core colours

Single-core + bare cpc

Red or black

Brown or blue

Two-core + bare cpc

Red, black

Brown, blue

Alt. Two-core + bare cpc

Red, red

Brown, brown

Three-core + bare cpc

Red, yellow, blue

Brown, black, grey

Table 7C – Standard 600/1000V armoured cable BS 6346, BS 5467 or BS 6724 Cable type

Old core colours

New core colours

Single-core

Red or black

Brown or blue

Two-core

Red, black

Brown, blue

Three-core

Red, yellow, blue

Brown, black, grey

Four-core

Red, yellow, blue, black

Brown, black, grey, blue

Red, yellow, blue, black,

Brown, black, grey, blue,

green-and-yellow

green-and-yellow

Five-core

Table 7D – Flexible cable to BS 6500 Cable type

Old core colours

New core colours

Two-core

Brown, blue

No change

Three-core

Brown, blue, green-and-yellow

No change

Four-core

Black, blue, brown,

Brown, black, grey,

In a two- or three-phase power circuit the line conductors may all be of one of the permitted colours, either identified L1, L2, L3 or marked brown, black, grey at their terminations to show the phases.

6 Changes to cable core colour identification

Table 7B – Cable to BS 6004 (flat cable with bare cpc) Cable type

Old core colours

New core colours

Single-core + bare cpc

Red or black

Brown or blue

Two-core + bare cpc

Red, black

Brown, blue

Alt. Two-core + bare cpc

Red, red

Brown, brown

Three-core + bare cpc

Red, yellow, blue

Brown, black, grey

Table 7C – Standard 600/1000V armoured cable BS 6346, BS 5467 or BS 6724 Cable type

Old core colours

New core colours

Single-core

Red or black

Brown or blue

Two-core

Red, black

Brown, blue

Three-core

Red, yellow, blue

Brown, black, grey

Four-core

Red, yellow, blue, black

Brown, black, grey, blue

Red, yellow, blue, black,


green-and-yellow

green-and-yellow

Five-core

Table 7D – Flexible cable to BS 6500 Cable type

Old core colours

New core colours

Two-core

Brown, blue

No change

Three-core

Brown, blue, green-and-yellow

No change

Four-core

Black, blue, brown,

Brown, black, grey,

green-and-yellow

green-and-yellow

Black,blue, brown, black,


green-and-yellow

green-and-yellow

Five-core

7 Addition or alteration to a d.c. installation Where an addition or alteration is made to a d.c. installation wired in the old core colours with cable to the new core colours, unambiguous identification is required at the interface. Cores should be marked as follows:

Neutral and midpoint conductors Old and new conductors:

M

Line conductors Old and new conductors:

Brown or grey, or

Old and new conductors:

L, L+ or L-

Table 7E – Example of conductor marking at the interface for additions and alterations to a d.c. installation identified with the old ca ble colours Function

Old conductor

New conductor

Colour

Marking

Marking

Colour

Positive of two-wire circuit

Red

L+

L+

Brown

Negative of two-wire circuit

Black

L-

L-

Grey

Two-wire unearthed d.c. power circuit

Two-wire earthed d.c. power circuit

Positive (of negative earthed) circuit

Red

L+

L+

Brown

Negative (of negative earthed) circuit

Black

M

M

Blue

Positive (of positive earthed) circuit

Black

M

M

Blue

Negative (of positive earthed) circuit

Blue

L-

L-

Grey

Five-core

green-and-yellow

green-and-yellow

Black,blue, brown, black,


green-and-yellow

green-and-yellow

7 Addition or alteration to a d.c. installation Where an addition or alteration is made to a d.c. installation wired in the old core colours with cable to the new core colours, unambiguous identification is required at the interface. Cores should be marked as follows:

Neutral and midpoint conductors Old and new conductors:

M

Line conductors Old and new conductors:

Brown or grey, or

Old and new conductors:

L, L+ or L-

Table 7E – Example of conductor marking at the interface for additions and alterations to a d.c. installation identified with the old ca ble colours Function

Old conductor

New conductor

Colour

Marking

Marking

Colour

Positive of two-wire circuit

Red

L+

L+

Brown

Negative of two-wire circuit

Black

L-

L-

Grey

Two-wire unearthed d.c. power circuit

Two-wire earthed d.c. power circuit

Positive (of negative earthed) circuit

Red

L+

L+

Brown

Negative (of negative earthed) circuit

Black

M

M

Blue

Positive (of positive earthed) circuit

Black

M

M

Blue

Negative (of positive earthed) circuit

Blue

L-

L-

Grey

Outer positive of two-wire circuit derived from three-wire system

Red

L+

L+

Brown

Outer negative of two-wire circuit derived from three-wire system

Red

L-

L-

Grey

Positive of three-wire circuit

Red

L+

L+

Brown

Mid-wire of three-wire circuit

Black

M

M

Blue

Negative of three-wire circuit

Blue

L-

L-

Grey

Three-wired d.c. power circuit

Cable Certifications Below are the most common European Cable Certifications:

Three-wired d.c. power circuit

Outer positive of two-wire circuit derived from three-wire system

Red

L+

L+

Brown

Outer negative of two-wire circuit derived from three-wire system

Red

L-

L-

Grey

Positive of three-wire circuit

Red

L+

L+

Brown

Mid-wire of three-wire circuit

Black

M

M

Blue

Negative of three-wire circuit

Blue

L-

L-

Grey

Cable Certifications Below are the most common European Cable Certifications:

DIN 47100 European Colour Codes The DIN 47100 standard specifies the core colour of up to 44 cores. Above this it is usual practice to repeat the colours. The first colour is the colour of the base insulation and the second colour is that of either a longitudinal stripe or printed rings. Core

Colour

Core

Colour

1

White

23

White/Red

2

Brown

24

Brown/Red

3

Green

25

White/Back

4

Yellow

26

Brown/Black

5

Grey

27

Grey/Green

6

Pink

28

Yellow/Grey

7

Blue

29

Pink/Green

8

Red

30

Yellow/Pink

9

Black

31

Green/Blue

10

Violet

32

Yellow/Blue

11

Grey/Pink

33

Green/Red

12

Red/Blue

34

Yellow/Red

13

White/Green

35

Green/Black

14

Brown/Green

36

Yellow/Black

15

White/Yellow

37

Grey/Blue

16

Yellow/Brown

38

Pink/Blue

17

White Grey

39

Grey/Red

18

Grey/Brown

40

Pink/Red

19

White/Pink

41

Grey/Black

20

Pink/Brown

42

Pink/Black

DIN 47100 European Colour Codes The DIN 47100 standard specifies the core colour of up to 44 cores. Above this it is usual practice to repeat the colours. The first colour is the colour of the base insulation and the second colour is that of either a longitudinal stripe or printed rings. Core

Colour

Core

Colour

1

White

23

White/Red

2

Brown

24

Brown/Red

3

Green

25

White/Back

4

Yellow

26

Brown/Black

5

Grey

27

Grey/Green

6

Pink

28

Yellow/Grey

7

Blue

29

Pink/Green

8

Red

30

Yellow/Pink

9

Black

31

Green/Blue

10

Violet

32

Yellow/Blue

11

Grey/Pink

33

Green/Red

12

Red/Blue

34

Yellow/Red

13

White/Green

35

Green/Black

14

Brown/Green

36

Yellow/Black

15

White/Yellow

37

Grey/Blue

16

Yellow/Brown

38

Pink/Blue

17

White Grey

39

Grey/Red

18

Grey/Brown

40

Pink/Red

19

White/Pink

41

Grey/Black

20

Pink/Brown

42

Pink/Black

21

Pink/Brown

43

Blue/Black

22

Brown/Blue

44

Red/Black

Fire Performance Cable Standards Below is a list of the standards for FP cables in the United Kingdom, Germany and internationally. Click for a selection of the Fire Performance (FP) cables we have specified on-line or telephone us for more information.

British Standards BS 7629-1 : 1997

Specification for 300 / 500 V fire resistant electric cables having low emission of smoke and corrosive gases when affected by fire. Multicore cables.

BS 7629-2 : 1997

Specification for 300 / 500 V fire resistant electric cables having low emission of smoke and corrosive gases when affected by fire. Multipair cables.

BSEN 50266-1 : 2001

Common test methods for cables under fire conditions. Test for vertical flame spread of vertically mounted bunched wires of cables.

BSEN 50267-1 : 1999

Common test methods for cables under fire conditions. Tests on gases evolved during combustion of materials from cables. Procedures. Determination of the amount of halogen acid gas.

BSEN 50267-2-2 : Common test methods for cables under fire conditions. Test on gases evolved during combustion of materials from 1999 cables. Procedures. Determination of degree of acidity of gases for materials by measuring pH and conductivity. BSEN 60079-1 : 2004

Electrical apparatus for explosive gas atmospheres : Flameproof enclosures ‘d’

BSEN 60332-1-2 : test on electric and optical fibre cables under fire conditions. Test for vertical flame propagation for a single v ertical 2004 insulated wire or cable. Procedure for 1kW pre-mixed flame. BSEN 60332-1-3 : Tests on electric and optical fibre cables under fire conditions. Test for vertical flame propagation for a single vertical 2004 insulated wire or cable. Procedure for determination of flaming droplets / particles. BSEN 60332 – 2 – Tests on electric and optical fibre cables under fire conditions. Tests for vertical flame propagation for a single vertical 2 : 2004 insulated wire or cable. Procedure for diffusion flame. BS G 241 : 1988

Specification for fire proof electric cables for engine fire zone and airframe use

21

Pink/Brown

43

Blue/Black

22

Brown/Blue

44

Red/Black

Fire Performance Cable Standards Below is a list of the standards for FP cables in the United Kingdom, Germany and internationally. Click for a selection of the Fire Performance (FP) cables we have specified on-line or telephone us for more information.

British Standards BS 7629-1 : 1997

Specification for 300 / 500 V fire resistant electric cables having low emission of smoke and corrosive gases when affected by fire. Multicore cables.

BS 7629-2 : 1997

Specification for 300 / 500 V fire resistant electric cables having low emission of smoke and corrosive gases when affected by fire. Multipair cables.

BSEN 50266-1 : 2001

Common test methods for cables under fire conditions. Test for vertical flame spread of vertically mounted bunched wires of cables.

BSEN 50267-1 : 1999

Common test methods for cables under fire conditions. Tests on gases evolved during combustion of materials from cables. Procedures. Determination of the amount of halogen acid gas.

BSEN 50267-2-2 : Common test methods for cables under fire conditions. Test on gases evolved during combustion of materials from 1999 cables. Procedures. Determination of degree of acidity of gases for materials by measuring pH and conductivity. BSEN 60079-1 : 2004

Electrical apparatus for explosive gas atmospheres : Flameproof enclosures ‘d’

BSEN 60332-1-2 : test on electric and optical fibre cables under fire conditions. Test for vertical flame propagation for a single v ertical 2004 insulated wire or cable. Procedure for 1kW pre-mixed flame. BSEN 60332-1-3 : Tests on electric and optical fibre cables under fire conditions. Test for vertical flame propagation for a single vertical 2004 insulated wire or cable. Procedure for determination of flaming droplets / particles. BSEN 60332 – 2 – Tests on electric and optical fibre cables under fire conditions. Tests for vertical flame propagation for a single vertical 2 : 2004 insulated wire or cable. Procedure for diffusion flame. BS G 241 : 1988

Specification for fire proof electric cables for engine fire zone and airframe use

German Standards DIN VDE 0266 Part 3 & 4

Halogen free cables with improved characteristics in the case of fire, with reduced fire propagation and continuance of isolation for use in the containment of nuclear power plants

DIN VDE 0267

Halogen free cables with improved characteristics in the case of fire, nominal voltages from 6 up to 30kV

DIN VDE 0276 Part 604

Power cables of nominal voltages 0.6 / 1kV with special fire performance for use in power stations

DIN 4102-12

Fire behaviour of building materials and elements – fire resistance of electric cable systems required to maintain circuit integrity – requirements and testing

DIN 4102-9

Fire behaviour of building materials and elements – seals for cable penetrations ; concepts, requirements and testing

International Standards IEC 60331-11

Tests for electric cables under fire conditions – circuit integrity – Part 11 : apparatus – fire alone at a flame temperature of at least 750oC

IEC 60331-12

Tests for electric cables under fire conditions – circuit integrity – Part 12 : apparatus – fire with shock at a temperature of at o least 830 C

IEC 60331-21

Tests for electric cables under fire conditions – circuit integrity – Part 21 : procedures and requirements – cables of rated voltage up to an dincluding 0.6 / 1.0kV

IEC 60331-23

Tests for electric cables under fire conditions – circuit integrity – Part 23 : procedures and requirements – electric data cables

IEC 60331-25

Tests for electric cables under fire conditions – circuit integrity – Part 25 : procedures and requirements – optical fibre cables

IEC 60331-31

Tests for electric cables under fire conditions – circuit integrity – Part 31 : procedures and requirements for fire with shock – cables of rated voltage up to and includign 0.6 / 1.0 kV

IEC 60332-1-1

Tests on electric and optical fibre cables under fire conditions part 1 : test for vertical flame propagation for a single insulated wire or cable Section 1 : apparatus

IEC 60332-1-2

Tests on electric and optical fibre cables under fire conditions Part 1 : test for vertical flame propagation for a single insulated wire or cable Section 2: procedure for 1kW pre-mixed flame

IEC 60332-1-3

Test on electric and optical fibre cables under fire conditions Part 1 : test for vertical flame propagation for a single insulated wire or cable Section 3 : procedure for determination of flaming droplets / particles

German Standards DIN VDE 0266 Part 3 & 4

Halogen free cables with improved characteristics in the case of fire, with reduced fire propagation and continuance of isolation for use in the containment of nuclear power plants

DIN VDE 0267

Halogen free cables with improved characteristics in the case of fire, nominal voltages from 6 up to 30kV

DIN VDE 0276 Part 604

Power cables of nominal voltages 0.6 / 1kV with special fire performance for use in power stations

DIN 4102-12

Fire behaviour of building materials and elements – fire resistance of electric cable systems required to maintain circuit integrity – requirements and testing

DIN 4102-9

Fire behaviour of building materials and elements – seals for cable penetrations ; concepts, requirements and testing

International Standards IEC 60331-11

Tests for electric cables under fire conditions – circuit integrity – Part 11 : apparatus – fire alone at a flame temperature of at least 750oC

IEC 60331-12

Tests for electric cables under fire conditions – circuit integrity – Part 12 : apparatus – fire with shock at a temperature of at o least 830 C

IEC 60331-21

Tests for electric cables under fire conditions – circuit integrity – Part 21 : procedures and requirements – cables of rated voltage up to an dincluding 0.6 / 1.0kV

IEC 60331-23

Tests for electric cables under fire conditions – circuit integrity – Part 23 : procedures and requirements – electric data cables

IEC 60331-25

Tests for electric cables under fire conditions – circuit integrity – Part 25 : procedures and requirements – optical fibre cables

IEC 60331-31

Tests for electric cables under fire conditions – circuit integrity – Part 31 : procedures and requirements for fire with shock – cables of rated voltage up to and includign 0.6 / 1.0 kV

IEC 60332-1-1

Tests on electric and optical fibre cables under fire conditions part 1 : test for vertical flame propagation for a single insulated wire or cable Section 1 : apparatus

IEC 60332-1-2

Tests on electric and optical fibre cables under fire conditions Part 1 : test for vertical flame propagation for a single insulated wire or cable Section 2: procedure for 1kW pre-mixed flame

IEC 60332-1-3

Test on electric and optical fibre cables under fire conditions Part 1 : test for vertical flame propagation for a single insulated wire or cable Section 3 : procedure for determination of flaming droplets / particles

IEC 60332-2-1

Tests on electric and optical fibre cables under fire conditions Part 2 : test for vertical flame propagation for a single small insulated wire or cable Section 1 : apparatus

IEC 60332-2-2

Tests on electric and optical fibre cables under fire conditions Part 2 : test for vertical flame propagation for a single small insulated wire or cable Section 2 : procedure for diffusion flame

IEC 60332-3-10

Tests on electric cables under fire conditions Part 3 : test for vertical flame spread of vertically mounted bunched wires or cables Section 10 : apparatus

IEC 60332-3-21

Tests on electric cables under fire conditions Part 3 : test for vertical flame spread of vertically mounted bunched wires or cables Section 21 : category A F/R

IEC 60332-3-23

Tests on electric cables under fire conditions Part 3 : test for vertical flame spread of vertically mounted bunched wire or cables Section 23 : category B

IEC 60332-3-24

Tests on electric cables under fire conditions Part 3 : test for vertical flame spread of vertically mounted bunched wire or cables Section 24 category C

IEC 60332-3-25

Tests on electric cables under fire conditions Part 3 : test for vertical flame spread of vertically mounted bunched wires or cables Section 25 category D

IEC / TR 6222

Fire performance of communication cables installed in buildings

Voltage Drop Calculations The voltage drop of any insulated cable is dependent upon the rou te length under consideration (in meters), the required current rating (in amperes) and the relevant total impedance per unit length of the cable. The maximum impedance and voltage drop applicable to each cable at maximum conductor temperature and un der a.c. conditions is given in the tables. For cables operating under dc conditions, the appropriate voltage drops may be calculated using the formula.

2 x route length x current x resistance x 10¯³ . The values detailed in the tables are given in m/V/Am, (volts/100 per ampere per metre), and the nominal maximum acceptable volt drop specified by the IEE Regulations is 2.5% of the system voltage, i.e. 0.025 x 415 = 10.5 volts for 3 phase working or 0.025 x 240 = 6.0 volts for single phase working. Consider a 3 phase system The requirement may be for a load of 1000A to be transmitted over a route length of 150m, the cable to be clipped to the wall and close protection provided. The rating tables in the IEE Regulations indicate that a 35mm copper conductor PVC SWA PVC cable would be suitable for the loading required, but the voltage drop must be checked.

IEC 60332-2-1

Tests on electric and optical fibre cables under fire conditions Part 2 : test for vertical flame propagation for a single small insulated wire or cable Section 1 : apparatus

IEC 60332-2-2

Tests on electric and optical fibre cables under fire conditions Part 2 : test for vertical flame propagation for a single small insulated wire or cable Section 2 : procedure for diffusion flame

IEC 60332-3-10

Tests on electric cables under fire conditions Part 3 : test for vertical flame spread of vertically mounted bunched wires or cables Section 10 : apparatus

IEC 60332-3-21

Tests on electric cables under fire conditions Part 3 : test for vertical flame spread of vertically mounted bunched wires or cables Section 21 : category A F/R

IEC 60332-3-23

Tests on electric cables under fire conditions Part 3 : test for vertical flame spread of vertically mounted bunched wire or cables Section 23 : category B

IEC 60332-3-24

Tests on electric cables under fire conditions Part 3 : test for vertical flame spread of vertically mounted bunched wire or cables Section 24 category C

IEC 60332-3-25

Tests on electric cables under fire conditions Part 3 : test for vertical flame spread of vertically mounted bunched wires or cables Section 25 category D

IEC / TR 6222

Fire performance of communication cables installed in buildings

Voltage Drop Calculations The voltage drop of any insulated cable is dependent upon the rou te length under consideration (in meters), the required current rating (in amperes) and the relevant total impedance per unit length of the cable. The maximum impedance and voltage drop applicable to each cable at maximum conductor temperature and un der a.c. conditions is given in the tables. For cables operating under dc conditions, the appropriate voltage drops may be calculated using the formula.

2 x route length x current x resistance x 10¯³ . The values detailed in the tables are given in m/V/Am, (volts/100 per ampere per metre), and the nominal maximum acceptable volt drop specified by the IEE Regulations is 2.5% of the system voltage, i.e. 0.025 x 415 = 10.5 volts for 3 phase working or 0.025 x 240 = 6.0 volts for single phase working. Consider a 3 phase system The requirement may be for a load of 1000A to be transmitted over a route length of 150m, the cable to be clipped to the wall and close protection provided. The rating tables in the IEE Regulations indicate that a 35mm copper conductor PVC SWA PVC cable would be suitable for the loading required, but the voltage drop must be checked.

Volt drop = Y x current x length = 1.1 x 100 x 150 millivolts = 1.1 x 100 x 150 volts/1000 = 16.5 volts where Y = value from tables in mV/A/m Unless a particular value of voltage drop, acceptable to the user, is specified, the IEE Regulations figure of 10.5 volts must be adhered to. Thus: total volt drop = 10.5 volts 10.5 = Y x 100 x 150 Therefore Y = 10.5/100 x 150 = 0.7/1000 volts/ampere/meters Reference to the voltage drop tables indicates that the cable size with a voltage drop of 0.7/1000 V/A/m (0.7mV/A/m) OR LESS is a 70mm copper conductor. Therefore, in order to transmit a 3 phase current of 100A per phase over a route length of 150m, with a total voltage drop equal to or less than the statutory maximum 10.5 volts, the use would require a 70mm (cu.) multicore PVC.

Conversely The user may have 150m of 35mm (Cu.) multicore PVC cable and require to know what maximum current rating can be applied without exceeding the allowable voltage drop. The method is exactly the same as above, viz:total drop = 16.6 = YxAxM = 1.1 x A x 150/1000 from the tables Y = 1.1mV/A/m =1.1/1000V/A/m therefore A = 10.5 x 1000/1.1.x 150 =64 amperes From the foregoing, it is apparent that knowing any two values of Y, A or m, the remaining, unknown value can readily be calculated. The advice is always available to check, clarify or suggest the most suitable size and type of cable for any particular, specified requirements.

Voltage Drop for Single Core LV Cables (mV / amp / metre) Copper Conductor

>Flat Arrangement

Trefoil arrangement

Aluminium conductor

Flat arrangement

Trefoil arrangement

Volt drop = Y x current x length = 1.1 x 100 x 150 millivolts = 1.1 x 100 x 150 volts/1000 = 16.5 volts where Y = value from tables in mV/A/m Unless a particular value of voltage drop, acceptable to the user, is specified, the IEE Regulations figure of 10.5 volts must be adhered to. Thus: total volt drop = 10.5 volts 10.5 = Y x 100 x 150 Therefore Y = 10.5/100 x 150 = 0.7/1000 volts/ampere/meters Reference to the voltage drop tables indicates that the cable size with a voltage drop of 0.7/1000 V/A/m (0.7mV/A/m) OR LESS is a 70mm copper conductor. Therefore, in order to transmit a 3 phase current of 100A per phase over a route length of 150m, with a total voltage drop equal to or less than the statutory maximum 10.5 volts, the use would require a 70mm (cu.) multicore PVC.

Conversely The user may have 150m of 35mm (Cu.) multicore PVC cable and require to know what maximum current rating can be applied without exceeding the allowable voltage drop. The method is exactly the same as above, viz:total drop = 16.6 = YxAxM = 1.1 x A x 150/1000 from the tables Y = 1.1mV/A/m =1.1/1000V/A/m therefore A = 10.5 x 1000/1.1.x 150 =64 amperes From the foregoing, it is apparent that knowing any two values of Y, A or m, the remaining, unknown value can readily be calculated. The advice is always available to check, clarify or suggest the most suitable size and type of cable for any particular, specified requirements.

Voltage Drop for Single Core LV Cables (mV / amp / metre) Copper Conductor

>Flat Arrangement

Trefoil arrangement

Aluminium conductor

Flat arrangement

Trefoil arrangement

4

7.83

7.770

16

3.343

3.283

6

5.287

5.226

25

2.161

2.100

10

3.184

3.124

35

1.602

1.542

16

2.086

2.008

50

1.222

1.162

25

1.357

1.297

70

0.890

0.830

35

1.034

0.971

95

0.686

0.623

50

0.793

0.732

120

0.56 9

0.509

70

0.595

0.534

150

0.49 0

0.430

95

0.469

0.408

185

0.42 0

0.360

120

0.410

0.349

240

0.353

0.293

150

0.354

0.294

300

0.312

0.252

185

0.312

0.252

400

0.274

0.214

240

0.272

0.211

400

0.245

0.185

630

0.222

0.162

300

0.247

0.187

400

0.224

0.164

500

0.208

0.148

630

0.194

0.134

VOLTAGE DROP PER AMPERE PER METER (mV). Conductor operating temperature: 70ºC Conductor Cross Sectional Area

Two Core Cable D.C.

Two Core Cable SIngle Phase A.C.

Three or Four Core Cable Three phase A.C.

mm

mV

mV

mV

1.5

29

29

25

2.5

18

18

15

4

11

11

9.05

4

7.83

7.770

16

3.343

3.283

6

5.287

5.226

25

2.161

2.100

10

3.184

3.124

35

1.602

1.542

16

2.086

2.008

50

1.222

1.162

25

1.357

1.297

70

0.890

0.830

35

1.034

0.971

95

0.686

0.623

50

0.793

0.732

120

0.56 9

0.509

70

0.595

0.534

150

0.49 0

0.430

95

0.469

0.408

185

0.42 0

0.360

120

0.410

0.349

240

0.353

0.293

150

0.354

0.294

300

0.312

0.252

185

0.312

0.252

400

0.274

0.214

240

0.272

0.211

400

0.245

0.185

300

0.247

0.187

630

0.222

0.162

400

0.224

0.164

500

0.208

0.148

630

0.194

0.134

VOLTAGE DROP PER AMPERE PER METER (mV). Conductor operating temperature: 70ºC Conductor Cross Sectional Area

Two Core Cable D.C.

Two Core Cable SIngle Phase A.C.

Three or Four Core Cable Three phase A.C.

mm

mV

mV

mV

1.5

29

29

25

2.5

18

18

15

4

11

11

9.05

6

7.3

7.3

6.04

10

4.4

4.4

3.08

16

2.8

2.8

2.04

r

x

z

r

x

z

25

1.75

1.75

0.170

1.75

1.50

0.145

1.50

35

1.25

1.25

0.165

1.25

1.10

0.145

1.10

50

0.93

0.93

0.165

0.94

0.80

0.140

0.81

70

0.63

0.63

0.160

0.65

0.55

0.140

0.57

95

0.46

0.47

0.155

0.50

0.41

0.135

0.43

120

0.36

0.38

0.155

0.41

0.33

0.135

0.35

150

0.29

0.30

0.155

0.34

0.26

0.130

0.29

185

0.23

0.28

0.150

0.29

0.21

0.130

0.25

240

0.180

0.190

0.150

0.24

0.165

0.130

0.21

300

0.145

0.155

0.145

0.21

0.136

0.130

0.185

400

0.105

0.115

0.145

0.185

0.100

0.125

0.160

VOLTAGE DROP PER AMPERE PER METRE (mV). Conductor operating temperature: 70ºc Conductor Cross-Secti onal Area

Two Core Cable D.C.

TWo Core Cable Single Phase A.C.

1

2

3

Three or Four Core Cable Three Phase A.C. 4

Mm

Mv

MV

MV

16

4.5

45

3.9

25

2.9

29

0.175

2.9

2.5

0.150

2.5

35

2.1

2.1

0.170

2.1

1.80

0.150

1.80

50

1.55

1.55

0.170

1.55

1.35

0.145

1.35

70

1.05

1.05

0.165

1.05

0.90

0.140

0.92

6

7.3

7.3

6.04

10

4.4

4.4

3.08

16

2.8

2.8

2.04

r

x

z

r

x

z

25

1.75

1.75

0.170

1.75

1.50

0.145

1.50

35

1.25

1.25

0.165

1.25

1.10

0.145

1.10

50

0.93

0.93

0.165

0.94

0.80

0.140

0.81

70

0.63

0.63

0.160

0.65

0.55

0.140

0.57

95

0.46

0.47

0.155

0.50

0.41

0.135

0.43

120

0.36

0.38

0.155

0.41

0.33

0.135

0.35

150

0.29

0.30

0.155

0.34

0.26

0.130

0.29

185

0.23

0.28

0.150

0.29

0.21

0.130

0.25

240

0.180

0.190

0.150

0.24

0.165

0.130

0.21

300

0.145

0.155

0.145

0.21

0.136

0.130

0.185

400

0.105

0.115

0.145

0.185

0.100

0.125

0.160

VOLTAGE DROP PER AMPERE PER METRE (mV). Conductor operating temperature: 70ºc Conductor Cross-Secti onal Area

Two Core Cable D.C.

TWo Core Cable Single Phase A.C.

1

2

3

Three or Four Core Cable Three Phase A.C. 4

Mm

Mv

MV

MV

16

4.5

45

3.9

25

2.9

29

0.175

2.9

2.5

0.150

2.5

35

2.1

2.1

0.170

2.1

1.80

0.150

1.80

50

1.55

1.55

0.170

1.55

1.35

0.145

1.35

70

1.05

1.05

0.165

1.05

0.90

0.140

0.92

0.160

0.79

95

0.77

0.77

0.67

0.140

0.68

120

-

-

0.53

0.135

0.55

150

-

-

0.42

0.135

0.44

185

-

-

0.34

0.135

0.37

240

-

-

0.26

0.130

0.30

300

-

-

0.21

0.130

0.25

Tables derive from IEE copyright information

PVC INSULATED 600/1000 VOLT CABLES WITH COPPER CONDUCTORS SUSTAINED CURRENT RATING (AMP) (50Hz) PARAMETERS 600/100 VOLT THREE-PHASE SINGLE CORE CABLES IN TREFOIL ARRANGEMENT

Normal Conductor Area mm

Direct Armoured

Duct Armoured

Air Unarmoured

Air Armoured

50

203

199

184

193

70

248

241

233

249

95

297

282

290

298

120

337

311

338

347

150

376

342

338

395

185

423

375

450

452

240

485

419

537

532

300

542

459

620

607

700

600

489

722

690

500

660

523

832

776

630

721

563

957

869

800

758

587

1083

937

1000

797

621

1260

1010

95

0.77

0.77

0.67

0.140

0.68

120

-

-

0.160

0.79

0.53

0.135

0.55

150

-

-

0.42

0.135

0.44

185

-

-

0.34

0.135

0.37

240

-

-

0.26

0.130

0.30

300

-

-

0.21

0.130

0.25

Tables derive from IEE copyright information

PVC INSULATED 600/1000 VOLT CABLES WITH COPPER CONDUCTORS SUSTAINED CURRENT RATING (AMP) (50Hz) PARAMETERS 600/100 VOLT THREE-PHASE SINGLE CORE CABLES IN TREFOIL ARRANGEMENT

Normal Conductor Area mm

Direct Armoured

Duct Armoured

Air Unarmoured

Air Armoured

50

203

199

184

193

70

248

241

233

249

95

297

282

290

298

120

337

311

338

347

150

376

342

338

395

185

423

375

450

452

240

485

419

537

532

300

542

459

620

607

700

600

489

722

690

500

660

523

832

776

630

721

563

957

869

800

758

587

1083

937

1000

797

621

1260

1010

APPROXIMATE CURRENT PER LINE OR PHASE TAKEN AT FULL RATED HP BY MOTORS OF AVERAGE EFFICIENCY AND POWER FACTOR Motor Rating

Direct Current

Alternating Current

110V

220V

550V

240V

380V

415V

550V

HP

amp

amp

amp

amp

amp

amp

amp

0.5

5.7

2.8

1.1

3

1

10

5

2

6

1.9

1.7

1.3

2

18

9

3.6

10

3.6

3.3

2.5

3

26

13

5.2

15

5.1

4.6

3.5

5

42

21

8.4

24

8

7.3

5.5

7.5

60

30

12

35

11.6

10.6

8

10

80

40

16

46

15.1

13.8

10.4

15

117

59

23

67

22

20

16

20

154

77

31

88

29

27

21

25

190

95

38

110

37

34

26

30

227

114

46

130

43

40

30

40

300

150

60

180

59

54

41

50

375

187

75

210

73

67

50

50

445

223

89

253

87

80

60

60

520

260

104

291

102

94

70

80

600

300

120

332

117

107

81

100

740

370

148

412

145

133

100

460

184

515

181

166

125

125

APPROXIMATE CURRENT PER LINE OR PHASE TAKEN AT FULL RATED HP BY MOTORS OF AVERAGE EFFICIENCY AND POWER FACTOR Motor Rating

550V

240V

380V

415V

550V

HP

amp

amp

amp

amp

amp

amp

amp

0.5

5.7

2.8

1.1

3

1

10

5

2

6

1.9

1.7

1.3

2

18

9

3.6

10

3.6

3.3

2.5

3

26

13

5.2

15

5.1

4.6

3.5

5

42

21

8.4

24

8

7.3

5.5

7.5

60

30

12

35

11.6

10.6

8

10

80

40

16

46

15.1

13.8

10.4

15

117

59

23

67

22

20

16

20

154

77

31

88

29

27

21

25

190

95

38

110

37

34

26

30

227

114

46

130

43

40

30

40

300

150

60

180

59

54

41

50

375

187

75

210

73

67

50

50

445

223

89

253

87

80

60

60

520

260

104

291

102

94

70

80

600

300

120

332

117

107

81

100

740

370

148

412

145

133

100

460

184

515

181

166

125

150

220

217

199

150

175

256

253

232

175

200

292

288

264

199

250

353

323

244

300

421

385

291

Useful three phase formulae: 1. kW = kVA x power factor Line amps x Line volts x 1.73 x p.f.

3. kVA =

1000

kW p.f.

4. Line amps =

kW x 1000 Line volts x 1.73 x p.f.

5. Line amps =

kVA x 1000 Line volts x 1.73

6. Line amps =

h.p. x 746 Line volts x 1.73 x Efficiency x p.f.

7. kVA =

Alternating Current

220V

125

2. kW =

Direct Current 110V

Line amps x Line volts x 1.73 1000

150

220

217

199

150

175

256

253

232

175

200

292

288

264

199

250

353

323

244

300

421

385

291

Useful three phase formulae: 1. kW = kVA x power factor Line amps x Line volts x 1.73 x p.f.

2. kW =

1000

kW p.f.

3. kVA =

4. Line amps =

kW x 1000 Line volts x 1.73 x p.f.

5. Line amps =

kVA x 1000 Line volts x 1.73

6. Line amps =

h.p. x 746 Line volts x 1.73 x Efficiency x p.f.

7. kVA =

Line amps x Line volts x 1.73 1000

8. kW =

h.p. x 746 1000 x Efficiency

9. kVA =

Line amps x Line volts x 1.73 x Efficiency x p.f. 746

10. h.p. =

kW x 1000 x Efficiency 746

11. h.p. =

kVA x 1000 x Efficiency 746

CURRENT RATINGS OF CABLES CLIPPED DIRECT TO SURFACE OR TRAY BUNCHED AND UNENCLOSED 3 One-Core 4 One-Core

2 ONe-Core D.C. Conductor Size

One Phase A.C.

1 Three Core 1 Four Core

1 Two Core DV

Three Phase A.C.

One-Phase A.C.

Three Phase A.C.

R

P

R

P

R

P

R

P

mm

amp

amp

amp

amp

amp

amp

amp

amp

2

1

16

13

15

12

14

12

12

10

1.5

21

16

19

15

18

15

15

13

2.5

29

23

26

20

24

21

21

18

4

38

30

34

27

31

27

27

24

6

49

38

45

34

40

35

35

30

10

67

51

60

46

56

48

48

41

16

90

38

81

61

72

64

64

54

h.p. x 746 1000 x Efficiency

8. kW =

9. kVA =

Line amps x Line volts x 1.73 x Efficiency x p.f. 746

10. h.p. =

kW x 1000 x Efficiency 746

11. h.p. =

kVA x 1000 x Efficiency 746

CURRENT RATINGS OF CABLES CLIPPED DIRECT TO SURFACE OR TRAY BUNCHED AND UNENCLOSED 3 One-Core 4 One-Core

2 ONe-Core D.C. Conductor Size

One Phase A.C.

1 Three Core 1 Four Core

1 Two Core DV

Three Phase A.C.

One-Phase A.C.

Three Phase A.C.

R

P

R

P

R

P

R

P

mm

amp

amp

amp

amp

amp

amp

amp

amp

2

1

16

13

15

12

14

12

12

10

1.5

21

16

19

15

18

15

15

13

2.5

29

23

26

20

24

21

21

18

4

38

30

34

27

31

27

27

24

6

49

38

45

34

40

35

35

30

10

67

51

60

46

56

48

48

41

16

90

38

81

61

72

64

64

54

25

115

89

105

80

96

71

84

62

35

145

109

130

98

115

87

100

72

50

205

175

185

160

170

140

150

125

70

260

220

235

200

210

175

185

155

95

320

270

285

240

255

215

225

190

120

370

310

335

280

300

250

260

215

150

420

355

380

320

335

285

300

250

185

480

405

435

365

385

325

345

280

240

570

480

520

430

450

385

400

335

300

660

560

600

500

520

445

460

390

400

770

680

700

610

500

890

800

800

710

630

1050

910

950

820

CURRENT RATINGS OF CABLES IN CONDUIT OR TRUNKING BUNCHED AND ENCLOSED Conductor Size

2 One Core D.C.

4 One Core

D.C.

One Phase AC

Three Phase AC

One Phase AC

Three Phase A.C.

R

P

R

P

R

P

R

P

mm

amp

amp

amp

amp

amp

amp

amp

amp

2

1

14

11

11

9

12

11

10

9

1.5

17

13

14

11

15

13

13

12

2.5

24

18

20

16

20

18

17

16

4

31

24

27

22

27

24

23

22

6

40

31

35

28

34

30

30

27

25

115

89

105

80

96

35

145

109

50

205

175

70

260

71

84

130

98

185

160

220

235

62

115

87

100

72

170

140

150

125

200

210

175

185

155

95

320

270

285

240

255

215

225

190

120

370

310

335

280

300

250

260

215

150

420

355

380

320

335

285

300

250

185

480

405

435

365

385

325

345

280

240

570

480

520

430

450

385

400

335

300

660

560

600

500

520

445

460

390

400

770

680

700

610

500

890

800

800

710

630

1050

910

950

820

CURRENT RATINGS OF CABLES IN CONDUIT OR TRUNKING BUNCHED AND ENCLOSED Conductor Size

2 One Core D.C.

4 One Core

D.C.

One Phase AC

Three Phase AC

One Phase AC

Three Phase A.C.

R

P

R

P

R

P

R

P

mm

amp

amp

amp

amp

amp

amp

amp

amp

1

14

11

11

9

12

11

10

9

1.5

17

13

14

11

15

13

13

12

2.5

24

18

20

16

20

18

17

16

4

31

24

27

22

27

24

23

22

6

40

31

35

28

34

30

30

27

10

55

42

49

39

47

40

41

37

16

73

56

66

53

61

53

54

47

25

94

73

89

71

80

60

70

53

35

115

90

110

88

97

74

86

65

50

170

145

145

125

70

215

185

185

160

95

265

230

225

195

120

310

260

260

220

150

350

2

300

R = Heat-resisting rubber insulation P = PVC insulation

MINIMUM SIZE OF EARTH CONDUCTOR (IF NOT CONTAINED IN CABLE) Size of largest associated copper circuit conductor

Size of Earthing Conductor

Size of Earthing Continuity Conductor

Size of Bonding Lead

1

6

1*

1#*

1.5

6

1*

1#*

2.5

6

1*

1#*

4

6

2.5

1#*

6

6

2.5

1#*

10

6

6

2.5

16

6

6

2.5

25

16

16

6

35

16

16

6

50

16

16

6

70

50

50

16

10

55

42

49

39

47

40

41

37

16

73

56

66

53

61

53

54

47

25

94

73

89

71

80

60

70

53

35

115

90

110

88

97

74

86

65

50

170

145

145

125

70

215

185

185

160

95

265

230

225

195

120

310

260

260

220

150

350

300

R = Heat-resisting rubber insulation P = PVC insulation

MINIMUM SIZE OF EARTH CONDUCTOR (IF NOT CONTAINED IN CABLE) Size of largest associated copper circuit conductor

Size of Earthing Conductor

Size of Earthing Continuity Conductor

Size of Bonding Lead

1

6

1*

1#*

1.5

6

1*

1#*

2.5

6

1*

1#*

4

6

2.5

1#*

6

6

2.5

1#*

10

6

6

2.5

16

6

6

2.5

25

16

16

6

35

16

16

6

50

16

16

6

70

50

50

16

95

50

50

16

120

50

50

16

150

50

50

16

185

70

70

50

240

70

70

50

300

70

70

50

400

70

70

50

500

70

70

50

630

70

70

50

* 1.5 sq mm where earth conductor in unenclosed # 2.5 sq mm for bonding other services at entry to premises.

DIAMETERS AND GLAND SIZES OF ARMOURED PVC INSULATED CABLES Conductor Size

Max. Diameter of Core

No. of Cores

Wire

Recommended Gland Size#

Bedding Sheath

Armour

Sq. mm

mm

No. of Cores

mm

mm

14/8

26/8

2

7

9

mm

mm

BS4121

11 6/8

7/8

5/8

3

73/8

9 3/8

12 2/8

7/8

5/8

4

8.1

10.1

13

0.9

3/4 S*

5

8.9

10.9

13.8

0.9

3/4 S

7

9.7

11.7

14.5

0.9

3/4 S

10

12 2/4

15

18

1 1/4

3/4

12

12 3/4

15 2/4

18 2/4

1 1/4

3/4

19

15.1

17.8

21.1

1.25

1

27

18.5

22

25.4

1.6

1

37

21

24 2/4

17 3/4

1 2/4

1 3/4

Approximate Diameters Oversheath

95

50

50

16

120

50

50

16

150

50

50

16

185

70

70

50

240

70

70

50

300

70

70

50

400

70

70

50

500

70

70

50

630

70

70

50

* 1.5 sq mm where earth conductor in unenclosed # 2.5 sq mm for bonding other services at entry to premises.

DIAMETERS AND GLAND SIZES OF ARMOURED PVC INSULATED CABLES Conductor Size

Max. Diameter of Core

No. of Cores Bedding Sheath

Armour

Sq. mm

mm

No. of Cores

mm

mm

14/8

26/8

2

7

9

3

73/8

9 3/8

4

8.1

5 7 10

12 2/4

12

12 3/4

19

15.1

17.8

27

18.5

22

25.4

1.6

1

37

21

24 2/4

17 3/4

1 2/4

1 3/4

48

23 3/4

27 1/4

30 3/4

1 2/4

1 3/4

2

8.2

10.2

13.1

0.9

3 3/4 S*

3

8.7

10.7

13.6

0.9

3 3/4 S

4

9.6

11.6

14.5

0.9

3 3/4 S

5

10.5

12.5

15.4

0.9

3 3/4 3/4

2.5

4

6

10

3.3

4.3

5

61/4

Wire

Recommended Gland Size#

mm

mm

BS4121

11 6/8

7/8

5/8

12 2/8

7/8

5/8

10.1

13

0.9

3/4 S*

8.9

10.9

13.8

0.9

3/4 S

9.7

11.7

14.5

0.9

3/4 S

15

18

1 1/4

3/4

15 2/4

18 2/4

1 1/4

3/4

21.1

1.25

1

Approximate Diameters Oversheath

7

11 2/4

12 2/4

16 2/4

1

10

14.8

17.5

20.9

1.25

1

12

15.3

18

21.4

1.25

1

19

18.5

22

25.4

1.6

1

27

22

25 2/4

29 1/4

1 2/4

1 3/4

37

25

28 2/4

32 2/4

1 2/4

1 3/4

48

29

33 1/2

37 1/2

2

1 1/2

2

10.2

12.2

15.1

0.9

3 3/4 S

3

11

13

16

1

3/4

4

12

14 3/4

17 3/4

1 1/4

3/4

5

12 1/4

16

19

1 1/4

3/4

7

14 2/4

17 1/4

20 2/4

1 1/4

1

10

19 1/4

22 3/4

26

1 2/4

1

12

19.8

23.3

26.8

1.6

1 3/4

19

12 2/4

27

30 2/4

1 2/4

1 1/4

27

28 1/2

33

37

2

1 1/2

2

11 2/4

13 2/4

16 2/4

1

3/4

3

12 1/4

12 1/4

18

1 1/4

3/4

4

13 2/4

13 2/4

19 1/4

1 1/4

3/4

2

14

16 3/4

20

1 1/4

3/4

3

15

17 3/4

21 1/4

1 1/4

1

2.5

4

6

10

16

3.3

4.3

5

61/4

Shaped Conductors

48

23 3/4

27 1/4

30 3/4

1 2/4

1 3/4

2

8.2

10.2

13.1

0.9

3 3/4 S*

3

8.7

10.7

13.6

0.9

3 3/4 S

4

9.6

11.6

14.5

0.9

3 3/4 S

5

10.5

12.5

15.4

0.9

3 3/4

7

11 2/4

12 2/4

16 2/4

1

3/4

10

14.8

17.5

20.9

1.25

1

12

15.3

18

21.4

1.25

1

19

18.5

22

25.4

1.6

1

27

22

25 2/4

29 1/4

1 2/4

1 3/4

37

25

28 2/4

32 2/4

1 2/4

1 3/4

48

29

33 1/2

37 1/2

2

1 1/2

2

10.2

12.2

15.1

0.9

3 3/4 S

3

11

13

16

1

3/4

4

12

14 3/4

17 3/4

1 1/4

3/4

5

12 1/4

16

19

1 1/4

3/4

7

14 2/4

17 1/4

20 2/4

1 1/4

1

10

19 1/4

22 3/4

26

1 2/4

1

12

19.8

23.3

26.8

1.6

1 3/4

19

12 2/4

27

30 2/4

1 2/4

1 1/4

27

28 1/2

33

37

2

1 1/2

2

11 2/4

13 2/4

16 2/4

1

3/4

3

12 1/4

12 1/4

18

1 1/4

3/4

4

13 2/4

13 2/4

19 1/4

1 1/4

3/4

2

14

16 3/4

20

1 1/4

3/4

3

15

17 3/4

21 1/4

1 1/4

1

4

16 2/4

19 1/4

22 3/4

1 1/4

1

2

13

15 2/4

19

1 1/4

3/4

3

14 2/4

14 2/4

20 2/4

1 1/4

1

4

19 3/4

16 3/4

24

1 1/4

1

#Glands Type BW, CW, D1W, D2W, E1W, E2W. • A cable made to minimum tolerance may be accommodated in a gland one size smaller.

GLAND SIZING CHART PVC/SWA/PVC CABLES Size MM Sq

Cores 1

2

3

4

1.5

16/20

16/20

20S

20S

20S

20L

20L

25S

25L

32

32

2.5

20S

20S

20S

20S

20L

25S

25S

25L

32

32

40S

4.0

20S

20L

20L

20L

20L

25L

32

32

40S

6.0

20L

20L

20L

10.0

25S

25S

25S

16.0

25S

25L

25L

25.0

25S

32

32

35.0

25L

32

32

50.0

32

32

40S

32

40S

40L

95.0

25S

40S

40S

50S

120.0

25L

40S

40L

50S

150.0

32

40L

50S

63S

185.0

32

50S

50L

63S

240.0

40S

50L

63S

63S

70.0

5

7

10

12

19

27

37

48

Shaped Conductors

16

4

16 2/4

19 1/4

22 3/4

1 1/4

1

2

13

15 2/4

19

1 1/4

3/4

3

14 2/4

14 2/4

20 2/4

1 1/4

1

4

19 3/4

16 3/4

24

1 1/4

1

#Glands Type BW, CW, D1W, D2W, E1W, E2W. • A cable made to minimum tolerance may be accommodated in a gland one size smaller.

GLAND SIZING CHART PVC/SWA/PVC CABLES Cores 1

Size MM Sq

2

3

4

5

1.5

16/20

16/20

20S

20S

2.5

20S

20S

20S

20S

4.0

20S

20L

20L

20L

6.0

20L

20L

20L

10.0

25S

25S

25S

16.0

25S

25L

25L

25.0

25S

32

32

35.0

25L

32

32

50.0

32

32

40S

70.0

32

40S

40L

95.0

25S

40S

40S

50S

120.0

25L

40S

40L

50S

150.0

32

40L

50S

63S

185.0

32

50S

50L

63S

240.0

40S

50L

63S

63S

7

300.0

40L

63S

63L

75L

400.0

50S

63L

75S

75L

500.0

50S

630.0

50L

10

12

20L

20L

25S

20L

25S

25S

20L

25L

32

20S

19

27

37

48

25L

32

32

25L

32

32

40S

32

40S

The gland sizes tabulated are intended as a guide only and are based on the approximate under armour and overall diameters. Cables with aluminium wire must have aluminium glands.

DERATING FACTORS GROUND TEMPERATURE DERATING FACTORS

AIR TEMPERATURE DERATING FACTOR o

Air Temperature C o

PVC cables rated at 70 C

25

30

35

40

45

50

55

1.22

1.15

1.08

1.00

0.95

0.82

0.71

25

30

35

40

45

50

55

1.13

1.07

1.00

0.93

0.85

0.76

0.65

Burial Depth Derating Factor o

Ground Temperature C o

PVC cables rated 70 C

Cables Cross Section Depth of laying mt

up to 70 mm sq

95mm sq – 240 mm sq

300 mm sq and above

0.5

1.00

1.00

1.00

0.60

0.99

0.98

0.97

0.80

0.97

0.96

0.94

1.00

0.95

0.93

0.92

300.0

40L

63S

63L

75L

400.0

50S

63L

75S

75L

500.0

50S

630.0

50L

The gland sizes tabulated are intended as a guide only and are based on the approximate under armour and overall diameters. Cables with aluminium wire must have aluminium glands.

DERATING FACTORS GROUND TEMPERATURE DERATING FACTORS

AIR TEMPERATURE DERATING FACTOR o

Air Temperature C o

PVC cables rated at 70 C

25

30

35

40

45

50

55

1.22

1.15

1.08

1.00

0.95

0.82

0.71

25

30

35

40

45

50

55

1.13

1.07

1.00

0.93

0.85

0.76

0.65

Burial Depth Derating Factor o

Ground Temperature C o

PVC cables rated 70 C

Cables Cross Section Depth of laying mt

up to 70 mm sq

95mm sq – 240 mm sq

300 mm sq and above

0.5

1.00

1.00

1.00

0.60

0.99

0.98

0.97

0.80

0.97

0.96

0.94

1.00

0.95

0.93

0.92

1.25

0.94

0.92

0.89

1.5

0.93

0.90

0.87

1.75

0.92

0.89

0.86

2.00

0.91

0.88

0.85

SOIL THERMAL RESISTIVITY DERATING FACTOR Soil thermal resistivity in °C cm / watt Rating factor

80

90

100

120

150

200

250

1.17

1.12

1.07

1.0

0.91

0.80

0.73

PVC Rated Temperature Derating Factor o

Type of PVC rated temperature C Rating Factor

70

85

95

105

1.000

1.195

1.309

1.414

1.25

0.94

0.92

0.89

1.5

0.93

0.90

0.87

1.75

0.92

0.89

0.86

2.00

0.91

0.88

0.85

SOIL THERMAL RESISTIVITY DERATING FACTOR Soil thermal resistivity in °C cm / watt Rating factor

80

90

100

120

150

200

250

1.17

1.12

1.07

1.0

0.91

0.80

0.73

PVC Rated Temperature Derating Factor o

Type of PVC rated temperature C Rating Factor

70

85

95

105

1.000

1.195

1.309

1.414

Wire cross sectional area calculation 2

The n gauge wire's cross sercional area An in square millimeters (mm ) is equal to pi divided by 4 times the square wire diameter d in millimeters (mm):

An (mm2) =

(π/4)×d n2

SWG to mm conversion chart SWG #

Diameter (mm)

Area 2 (mm )

7/0

12.700

126.6769

6/0

11.786

109.0921

5/0

10.973

94.5638

4/0

10.160

81.0732

3/0

9.449

70.1202

2/0

8.839

61.3643

0

8.230

53.1921

1

7.620

45.6037

Wire cross sectional area calculation 2

The n gauge wire's cross sercional area An in square millimeters (mm ) is equal to pi divided by 4 times the square wire diameter d in millimeters (mm):

An (mm2) =

(π/4)×d n2

SWG to mm conversion chart SWG #

Diameter (mm)

Area 2 (mm )

7/0

12.700

126.6769

6/0

11.786

109.0921

5/0

10.973

94.5638

4/0

10.160

81.0732

3/0

9.449

70.1202

2/0

8.839

61.3643

0

8.230

53.1921

1

7.620

45.6037

2

7.010

38.5989

3

6.401

32.1780

4

5.893

27.2730

5

5.385

22.7735

6

4.877

18.6793

7

4.470

15.6958

8

4.064

12.9717

9

3.658

10.5071

10

3.251

8.3019

11

2.946

6.8183

12

2.642

5.4805

13

2.337

4.2888

14

2.032

3.2429

15

1.829

2.6268

16

1.626

2.0755

17

1.422

1.5890

18

1.219

1.1675

19

1.016

0.8107

20

0.914

0.6567

21

0.813

0.5189

22

0.711

0.3973

23

0.610

0.2919

24

0.559

0.2452

25

0.5080

0.2027

26

0.4572

0.1642

27

0.4166

0.1363

28

0.3759

0.1110

29

0.3454

0.0937

30

0.3150

0.0779

31

0.2946

0.0682

32

0.2743

0.0591

33

0.2540

0.0507

34

0.2337

0.0429

35

0.2134

0.0358

36

0.1930

0.0293

37

0.1727

0.0234

38

0.1524

0.0182

39

0.1321

0.0137

40

0.1219

0.0117

41

0.1118

0.0098

42

0.1016

0.0081

43

0.0914

0.0066

IEE Wiring Regulation Basic Summary and Tables

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