Reference Method E (in free air or on a perforated cable tray horizontal or vertical
Reference Method D (direct in groundor in ducting in ground, in or around buildings)
1 two core cable, single phase a.c. or d.c.
1 three- or fourcore cable, three-phase a.c.
1 two core cable, single phase a.c. or d.c.
1 three- or fourcore cable, three-phase a.c.
1 two core cable, single phase a.c. or d.c.
1 three- or fourcore cable, three-phase a.c.
1
2
3
4
5
6
7
(mm²)
(A)
(A)
(A)
(A)
(A)
(A)
1.5
27
23
29
25
25
21
2.5 4 6 10 16
36 49 62 85 110
31 42 53 73 94
39 52 66 90 115
33 44 56 78 99
33 43 53 71 91
28 36 44 58 75
25 35 50 70 95
146 180 219 279 338
124 154 187 238 289
152 188 228 291 354
131 162 197 251 304
116 139 164 203 239
96 115 135 167 197
120 150 185 240 300
392 451 515 607 698
335 386 441 520 599
410 472 539 636 732
353 406 463 546 628
271 306 343 395 446
223 251 281 324 365
728
-
-
I N F O 400 787 673 847 R M 4 E4B A VOLTAGE DROP (per ampere per metre) TABLE 4E4B Conductor Two-core Two-core cable, T crosscable, d.c. single-phase a.c. I sectional O area N
2. Where cables cables in this table are connected to equipment or accessories designed to operate at a temperature not exceeding 70°C, the current ratings given in the equivalent table for 70°C thermoplastic insulated cables (Table 4D4A) must be used (see also Regulation 523.1)
Conductor operating temperature: 90°C Three- or four-core cable, three-phase a.c.
1
2
3
4
(mm²)
(mV/A/m)
(mV/A/m)
(mV/A/m)
1.5
31
31
27
2.5 4 6 10 16
19 12 7.9 4.7 2.9
19 12 7.9 4.7 2.9
16 10 6.8 4.0 2.5
r
x
z
r
x
z
1.85 1.35 0.98 0.67 0.49
1.85 1.35 0.99 0.67 0.50
0.160 0.155 0.155 0.150 0.150
1.90 1.35 1.00 0.69 0.52
1.60 1.15 0.86 0.59 0.43
0.140 0.135 0.135 0.130 0.130
1.65 1.15 0.87 0.60 0.45
120 150 185 240 300
0.39 0.31 0.25 0.195 0.155
0.40 0.32 0.26 0.20 0.16
0.145 0.145 0.145 0.140 0.140
0.42 0.35 0.29 0.24 0.21
0.34 0.28 0.22 0.175 0.140
0.130 0.125 0.125 0.125 0.120
0.37 0.30 0.26 0.21 0.185
400
0.120
0.13
0.140
0.190
0.115
0.120
0.165
25 35 50 70 95
NOTES: 1. Where a conductor operates at a temperature exceeding 70°C it must be ascertained that the equipment connected to the conductor is suitable for the conductor operating temperature (see Regulation 512.1.2).
All tables are reproduced by kind permission of The Institution of Engineering & Technology from IEE Regs, 17th Edition However, it should be noted that in order to apply these tables correctly, reference is required to appendix 4 of the 17th edition of the wiring regualtions which may be obtained from: Institution of Engineering & Technolgy, Michael Faraday House,Six Hills Way, Stevenage, Hertfordshire, ENGLAND, SG1 2AY.
272
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