Electrical Installation Rules for Ships

I

Rules for Classification and Construction Ship Technology

1

Seagoing Ships

3

Electrical Installations Installations

Edition 2010

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The following Rules come into force on 1 May 2010. Alterations to the preceding Edition are marked by beams at the text margin. Germanischer Lloyd AG Head Office Brooktorkai 18, 20457 Hamburg, Germany Phone: +49 40 36149-0 Fax: +49 40 36149-200 [email protected] www.gl-group.com "General Terms and Conditions" of the respective latest edition will be applicable (see Rules for Classification and Construction, I - Ship Technology, Part 0 - Classification Classification and Surveys).









Table of Contents

I - Part 1 GL 2010

Chapter 3 Page 3

Table of Contents

Section 1

General Requirements and Guidance

A.

General ............................................................ .............................................................. .............

1- 1

B.

Definitions .............................................................. ............................................................... .....

1- 1

C.

Documents ....................................................... ............................................................... ............

1- 4

D.

Further Rules and Standards to be considered

................................................................ ...........

1- 4

E.

Ambient Conditions

............................................................. ......................................................

1- 7

F.

Operating Conditions

...................................................................... ...........................................

1- 9

G.

Power Supply Systems ...................................................................... .........................................

1- 10

H.

Voltages and Frequencies ...................................................................... .....................................

1- 11

I.

Visual and Acoustical Signalling Devices ..................................................................................

1- 11

J.

Materials and Insulation .................................................................... .........................................

1- 11

K.

Protective Measures ................................................................. ..................................................

1- 12

Section 2

Installation of Electrical Equipment

A.

Availability of Main Power Supply ............................................................................................

2- 1

B.

Generators ......................................................... ............................................................ .............

2- 1

C.

Storage Batteries

............................................................ ............................................................

2- 2

D.

Power Transformers ....................................................... ........................................................ ....

2- 4

E.

Electronics .................................................................... ......................................................... .....

2- 4

F.

Low-Voltage Switchboards ......................................................................... ...............................

2- 4

G.

Medium Voltage Equipment (> 1 kV - 17,5 kV AC) ....................................................... ..........

2- 5

Section 3

Power Supply Installations

A.

Electrical Power Demand ......................................................................... ..................................

3- 1

B.

Main Electrical Power Supply .................................................................. ..................................

3- 1

C.

Emergency Electrical Power Supply

..........................................................................................

3- 5

D.

Operation of the emergency generator in port .......................................................................... ..

3- 6

Section 4

Installation Protection and Power Distribution

A.

Three-Phase Main Generators .................................................................. ..................................

4- 1

B.

Emergency Three-Phase Generators

.......................................................... ................................

4- 2

C.

Direct Current Generators ............................................................ ..............................................

4- 3

D.

Power Transformers ....................................................... ........................................................ ....

4- 3









Table of Contents

Chapter 3 Page 4

Section 5

I - Part 1 GL 2010

Low-Voltage Switchgear Assemblies

A.

General ................................................................... ........................................................... ..........

5- 1

B.

Calculations

................................................................ ............................................................... .

5- 1

C.

Construction ...................................................................... ......................................................... .

5- 2

D.

Selection of Switchgear

.......................................................................... ....................................

5- 4

E.

Choice of Electrical Protection Equipment .................................................................................

5- 5

F.

Conductors and Busbar Carriers

.................................................................................................

5- 6

G.

Measuring Instruments and Instrument Transformers .................................................................

5- 8

H.

Testing of Switchboards and Switchgear ............................................................... .....................

5- 9

Section 6

Power Electronics

A.

General ................................................................... ........................................................... ..........

6- 1

B.

Construction ......................................................... .............................................................. .........

6- 1

C.

Rating and Design ...................................................................... .................................................

6- 1

D.

Cooling

6- 2

E.

Control and Monitoring

F.

Protection Equipment

G.

Section 7

............................................................... .............................................................. .......... ............................................................. .................................................

6- 2

.............................................................. ...................................................

6- 2

Tests .......................................................... ................................................................ ..................

6- 2

Power Equipment

A.

Steering Gear

............................................................ ................................................................. .

7- 1

B.

Lateral Thrust Propellers and Manoeuvring Aids ...... .................................................................

7- 3

C.

Variable Pitch Propellers for Main Propulsion Systems ...... .......................................................

7- 4

D.

Auxiliary Machinery and Systems

..............................................................................................

7- 4

E.

Deck Machinery ............................................................. ............................................................ .

7- 6

F.

Electrical Heating Equipment and Heaters ...... ...................................................................... .....

7- 7

G.

Heel-Compensating Heel-Compensating Systems .......................................................................... .............................

7- 7

H.

Cross-flooding Arrangements ......................................................... ............................................

7- 7

Section 8

Medium-Voltage Installations

A.

Scope

......................................................... ............................................................... ..................

8- 1

B.

General Provisions .............................................................. ....................................................... .

8- 1

C.

Network Design and Protection Equipment ................................................................................

8- 2

D.

Electrical Equipment ................................................................. ..................................................

8- 4

E.

Installation

8- 7

................................................................... ............................................................. ..









Table of Contents

I - Part 1 GL 2010

Section 10

Chapter 3 Page 5

Computer Systems

A.

General ............................................................ ............................................................. ..............

10- 1

B.

Requirement Classes ........................................................... .......................................................

10- 1

C.

System Configuration ..................................................................... ............................................

10- 4

D.

Documents to be submitted .................................................................................. ......................

10- 5

E.

Testing of Computer Systems ................................................................... ..................................

10- 5

Section 11

Lighting and Socket-Outlets

A.

General ............................................................ ............................................................. ..............

11- 1

B.

Lighting Installations ................................................................ ..................................................

11- 1

C.

Socket-Outlets ................................................................... .........................................................

11- 2

Section 12

Cable Network

A.

Choice of Cables and Wires .................. ................................................................. ....................

12- 1

B.

Determination of Conductor Cross-Sections ..............................................................................

12- 1

C.

Rating, Protection and Installation of Circuits

...........................................................................

12- 3

D.

Installation ....................................................................... ...........................................................

12- 5

E.

Requirements for Busbar Trunking Systems intended for the Electrical Supply of Distribution Panels and Single Consumers ....................................................................... ..........

12- 10

Section 13

Additional Rules for Electrical Propulsion Plants

A.

General ............................................................ ............................................................. ..............

13- 1

B.

Drives .............................................................. ............................................................. ..............

13- 1

C.

Static Converter Installations

................................................................. ....................................

13- 1

D.

Control Stations ................................................................. .........................................................

13- 2

E.

Ships' Mains ................................................................. ........................................................ ......

13- 2

F.

Control and Regulating

................................................................ ..............................................

13- 2

G.

Protection of the Plant ........................................................................................................... .....

13- 2

H.

Measuring-, Indicating- and Monitoring Equipment ............................. .....................................

13- 3

I.

Cables and Cable Installation ................................................................ .....................................

13- 3

J.

Supervision during Construction, Testing and Trials .................................................................

13- 4

K.

Additional Rules for Ships with redundant Propulsion Systems (RP1x%, RP2x% or RP3x%) ............................................................ .............................................................. ............

13- 4

Section 14

A.

Additional Rules for Passenger Vessels

General ............................................................ ............................................................. ..............

14- 1









Table of Contents

Chapter 3 Page 6

Section 15

I - Part 1 GL 2010

Additional Rules for Tankers

A.

General ................................................................... .......................................................... ...........

15- 1

B.

Oil Tankers, Cargo Flash Point above 60 °C ............................................................... ...............

15- 2

C.

Oil Tankers, Cargo Flash Point 60°C or below ..................................................................... ......

15- 2

D.

Liquefied Gas Tankers ............................................................ ....................................................

15- 3

E.

Chemical Tankers

15- 3

Section 16

..................................................................... ..................................................

Additional Rules for Ships for the Carriage of Motor Vehicles

A.

Scope

......................................................... ............................................................... ..................

16- 1

B.

Protection Areas ........................................................... ............................................................. ..

16- 1

C.

Ventilation

......................................................... ............................................................... ..........

16- 1

D.

Fire Alarm System ........................................................... ......................................................... ..

16- 1

E.

Indicating and Monitoring Systems for Shell Doors ...................................................................

16- 1

F.

Additional Requirements for the Illumination on Ro/Ro Passenger Vessels

..............................

16- 2

G.

Installation of Electrical Equipment in Protection Areas ............................................................

16- 3

H.

Permissible Electrical Equipment ....................................................................... ........................

16- 3

Section 17

Additional Rules for Ships for the Carriage of Dangerous Goods

A.

Scope

......................................................... ............................................................... ..................

17- 1

B.

References to other Rules ............. ................................................................. .............................

17- 1

C.

Classes of Dangerous Goods

......................................................... .............................................

17- 1

D.

Hazardous Areas and permitted Electrical Equipment ..................................... ...........................

17- 2

E.

Installation of Electrical Systems in Hazardous Areas ................................................................

17- 5

F.

Certification if Installations not conform to the above Provisions ..............................................

17- 5

G.

Fire Pumps ..................................................................... ........................................................... ..

17- 5

H.

Alternative Electrical Power Supply for Ships intended for the Carriage of packaged irradiated Nuclear Fuel, Plutonium and high-level radioactive Wastes ......................................

17- 5

Characteristics of Electrical Equipment for Use in Hazardous Areas (Zone 1) for the Carriage of Solid Bulk Cargoes and in packaged form (partly) ..................................................

17- 6

I.

Section 18

A.

Additional Rules for Bulk Carriers and Single Hold Cargo Ships other than Bulk Carriers

General ................................................................... .......................................................... ...........

18- 1











Table of Contents

I - Part 1 GL 2010

Section 20

Chapter 3 Page 7

Electrical Equipment

A.

Electrical Machinery .............................................................. ....................................................

20- 1

B.

Transformers and Reactance Coils .............................................................................................

20- 7

C.

Capacitors

20- 8

D.

Storage Batteries, Chargers and Uninterruptible Power Supplies (UPS)

...................................

20- 9

E.

Switchgear and Protection Devices ............................................................. ...............................

20- 10

F.

Cables and Insulated Wires ................................. ................................................................... ....

20- 11

G.

Cable Penetrations and Fire Stops .......................................................................... ... ....................................................................... ....................

20- 13

H.

Installation Material

.......................................................................... .........................................

20- 13

I.

Lighting Fixtures ....................................................................... .................................................

20- 13

J.

Electrical Heating Equipment

................................................................................ ....................

20- 13

A.

General ............................................................ ............................................................. ..............

21- 1

B.

Examinations of Technical Documentation ...................................................................... ..........

21- 1

C.

Tests in the Manufacturer's Works ...................................... .......................................................

21- 1

D.

Tests on Board

....................................................................................................... ....................

21- 2

E.

Type Approvals ........................................................... .......................................................... .....

21- 3

Section 21

Section 22

................................................................ ............................................................ ......

Tests

Spare Parts









Chapter 3 Page 8

Index

I - Part 1 GL 2010

Index

A Air distances ....................................................... ................................................................. ................................ 1-12 Air gaps ............. ............................................................ .............................................................. ........................ 20-2 Alarm systems systems ................................................................ .............................................................. ......................... 9-3 Alarms ................................................................................................................................................................... 1-3 Ambient conditions ................. ....................................................................... ................................................. 1-4, 1-7 Anchor windlasses ..................................................................... ............................................................ ................ 7-6 Areas ...................................................................................................................................................................... 1-3 Availability ............................................................................................................................................................ 3-4

B Bathing rooms ......................................................... ............................................................ ................................ 11-2 Battery-room installation ........................................................................................................................................................ 2-2 Bearing currents .......................................................................................................... ......................................... 20-2 Bearings ............................................................................................................................................................... 20-1 Bilge level monitoring ................................................................ .......................................................... ............... 9-12 Bilge pumps passenger vessels ....................................................... ............................................................. ....................... 14-3 Boilers ............................................................................................................................................................... 20-14 Breaking capacity ...................... ....................................................................... ................................................. 20-11 Bulk Carriers ........................................................ ............................................................... ................................ 18-1 Bulkhead .............................................................................................................................................................. 12-8 Bulkhead penetrations ............................................................ ............................................................. .............. 20-13 Bunkers ................................................................................................................................................................ 11-1









I - Part 1 GL 2010

Index

Chapter 3 Page 9

Cables ............................................................ ................................................................ ........................... 12-1, 20-11 fire-resistant ................................................................... .............................................................. ..................... 1-3 medium-voltage medium-voltage .............................................................. .............................................................. .................... 8-7 Calculation of short-circuit currents .................................................................... ................................................... 5-1 Capacitors ................................................................ ............................................................... ............................. 20-8 Capstans ......................................................... ................................................................. ....................................... 7-6 Cargo holds ............................................... ........................................................ ................................ 9-10, 11-1, 11-2 Cargo winches ............................................................................... ............................................................ ............. 7-6 Charger ................................................................................................................... ............................................... 2-2 2-2 Chargers ............................................................ ............................................................. ...................................... 20-9 Check synchronizers ... ................................................................. ........................................................... ........... 20-11 Circuit breakers ....................................................................... .................................................... ........ 5-4, 8-6, 20-10 Clearances low-voltage .................................................................... .............................................................. ..................... 5-7 medium-voltage medium-voltage .............................................................. .............................................................. .................... 8-1 Closed loop control .................................................... .............................................................. .............................. 9-3 CO2-alarm systems ........................................................... ................................................................. .................... 9-6 Communication systems passenger vessels .................................................. ............................................................... ........................... 14-3 Communications Communications .......................................................................................... ...................................................... .... 9-5 Computer systems systems ................................................................ ............................................................ .................... 10-1 testing .............................................................. ................................................................... ............................ 10-5 Construction low-voltage .................................................................... .............................................................. ..................... 5-2 Consumer protection equipment ............................................................. ............................................................ ... 4-4 Contactors ................................................................. ............................................................... .............................. 8-6 Container connections .................................................................... ........................................................ ....... 3-1, 11-2 Control









Chapter 3 Page 10

Index

I - Part 1 GL 2010

electrical machinery ................................................... .............................................................. ...................... 20-1 power electronics ..................... ................................................................. ....................................................... 6-2 Cranes .................................................................................................................................................................... 7-6 Creepage distances ...................................................................... ......................................................... ............... 1-12 low-voltage ...................................................................................................................................................... 5-7 medium-voltage ............................................................................................................................................... 8-1 Cross-flooding arrangements .......................................................... ....................................................... .............. 14-3 Cross-sections ...................................................................................................................................................... 12-1 Cyclic irregularity generators ......................................................................................................................................................... 3-4

D Dangerous goods ................................................................ .... ............................................................ ......................................................... ........................ 17-1 classes ............................................................................................................................................................ 17-1 Deck machinery ................................................................................... .......................................................... ........ 7-6 Deck penetrations .................................................................... ........................................................ ......... 12-8, 20-13 Degrees of protection ............................................................ ............................................................... ............... 1-12 medium-voltage ............................................................................................................................................... 8-1 Detector ............................................................................................................................................................... 9-11 Detector systems .................................................................................................................. ................................ 18-2 Direct current generators ..................................................................... ........................................................ ... 3-3, 4-3 Distribution panels ..................................................................................................... ............................................ 5-4 Diversity factor .............................................. ...................................................................... ................................ 12-3 Documents for approval ........................................................... .............................................................. ............... 1-4 Dynamic loading .................................................................................................. .................................................. 5-2

E Earthed ................................................................................................................................................................ 1-13 Earthed neutral ............................................................. ............................................................. ................... 1-10, 8-3









I - Part 1 GL 2010

Index

Chapter 3 Page 11

Emergency engine telegraph system .................................................................. .................................................... 9-5 Emergency generators ...................................... ................................................................. ..................................... 4-2 installation ........................................................ .................................................................. .............................. 2-1 Emergency lighting ................................................................... ............................................................... ............ 11-1 Emergency power supply ........................................................ ........................................................... .................... 3-5 Emergency shut-down ........................................................... ............................................................. .................... 7-6 Emergency shutdown facilities ................................................................... ......................................................... .. 4-6 Emergency source of power ................................................... .......................................................... ............... 3-5, 3-6 Emergency switchboards ................................................................. ........................................................... ........... 5-3 installation ........................................................ .................................................................. .............................. 2-5 Engine telegraph systems ............................................................... ............................................................ ............ 9-4 Environmental effects ................................................................. ............................................................... ............ 1-7 Equipment ................................... ................................................................. ................................................. 1-1, 17-3 non-essential .............................................................. .................................................................. ..................... 1-2 Exciter circuits ...................................................................... ........................................................... ...................... 5-6 Explosion protection ........................................................... ......................................................... ..... 1-14, 16-3, 17-2

F Fans ............................................................. ................................................................... ........................................ 7-4 passenger vessels .................................................. ............................................................... ........................... 14-3 Final supply circuits ............................................................. ............................................................. ..................... 4-4 Fire alarm system ....................................................................... ............................................................... ............. 9-7 Ro/Ro-ships ......................................................... ............................................................... ............................ 16-1 Fire detection ................................................................ ................................................................... ...................... 9-7 passenger vessels .................................................. ............................................................... ........................... 14-4 Fire door indicator panel ................................................ .......................................................... ............................ 14-6 Fire door’s closing system passenger vessels .................................................. ............................................................... ........................... 14-5











Chapter 3 Page 12

Index

I - Part 1 GL 2010

Frequency drop ............................................. ............................................................ ............................................. 4-2 Frequency variations .................................................................................................... .......................................... 1-9 Fuel pumps ............ ...................................................................... ......................................................... ................. 7-5 Fuses ............................................................ .............................................................. ....................... 5-3, 5-5, 8-4, 8-6 FWBLAFFS ........................................................................................................................................................ 9-11

G General emergency alarm ................................................................. .............................................................. ....... 9-6 passenger vessels ....................................................... ............................................................. ....................... 14-4 Generator prime movers ........................................................... .............................................................. ............... 3-3 Generators ........................................................................................................................................................... 20-1 control .............................................................................................................................................................. 3-2 installation ........................................................................................................................................................ 2-1 rating ................................................................................................................................................................ 3-2

H Hazardous areas ............................................................... ........................................................... .................. 1-3, 17-2 Heat balance ............... ....................................................................... ............................................................ ........ 5-2 Heat test electrical machinery ................................................... .............................................................. ...................... 20-4 transformers ................................................................................................................................................... 20-8 Heaters ................................................................................................................................................................... 7-7









I - Part 1 GL 2010

Index

Chapter 3 Page 13

Installation material .................................................................... ............................................................. .......... 20-13 Instrument transformers ...................................................... .............................................................. ..................... 5-8 Insulation ....................................................................................................................... ...................................... 1-11 Insulation monitoring ................. ...................................................................... .................................................. 20-11 Insulation resistance ..................................................................... ......................................................... ........ 5-6, 20-7 Insulation resistance measurement measurement low-voltage .................................................................... .............................................................. ..................... 5-9 Integration of systems ............................................................... ............................................................. ....... 9-4, 10-5 IP degrees ........................................................ ............................................................... ..................................... 9-12 Isolating switches ......................................................... .................................................................... ...................... 8-6

K Kerosene lamp rooms ........................................................ ............................................................... ................... 1-15

L Lateral thrust propellers ................................................................. ............................................................ ............ 7-3 Lift alarm ............................................................... .................................................................. .............................. 9-6 Lighting ......................................................................................................................................................... 4-5, 11-1 passenger vessels .................................................. ............................................................... ........................... 14-7 Lighting fixtures .................................................................. ............................................................ ................... 20-13 Lightning protection ............................................... .................................................................. ............................ 1-17 Load characteristics









Chapter 3 Page 14

Index

I - Part 1 GL 2010

installation ........................................................................................................................................................ 2-5 Main engine telegraph system ......................................................................... ...................................................... 9-4 Main engines ................................................................... ............................................................. ....................... 13-1 Main generators ..................................................... .............................................................. .................................. 4-1 Main lighting ................... ....................................................................... ....................................................... ...... 11-1 Main power supply ............................................................. .......................................................... ......................... 3-1 Main switchboards ................................................................................................................ ................................. 5-2 installation ........................................................................................................................................................ 2-4 Mains quality ........................................ ...................................................................... ......................................... 1-10 Mains reactions ............................................................................................... ....................................................... 6-1 Making capacity ...................................................................... ............................................................ .............. 20-11 Manoeuvring aids .......... ................................................................. ................................................................ ....... 7-3 Marking ................................................................................................................................................................. 2-6 Materials .............................................................................................................................................................. 1-11 Measuring circuits ...................................................................... ........................................................... ................ 5-6 Measuring instruments ...................................... .................................................................... .......................... 5-3, 5-8 Medium-voltage installations .................................................................... ..................................................... 2-5, 8-1 Medium-voltage systems ................................. ...................................................................... ................................ 1-2 Minimum cross-sections ................................................ ............................................................... ....................... 12-3 Minimum degrees ....................... ................................................................. ........................................................ 1-13 Monitoring devices for generators ................................................................ ......................................................... 5-3









I - Part 1 GL 2010

Index

Chapter 3 Page 15

Operating conditions ............................... ....................................................................... ........................................ 1-9 Overcurrent protection ....................................................................... ................................................... ...... 5-5, 20-11 Overload protection .......................................................... ................................................................ ..................... 7-6 generators .............................................................. ............................................................. .............................. 4-1 Overload test electrical machinery ................................................................... ......................................................... ........... 20-4 Overspeed test electrical machinery .................................................................... ........................................................ ........... 20-4 Over-voltage protection ................................................................ ............................................................. ............ 4-1

P Paint rooms .......... ................................................................. ........................................................... .................... 1-15 Parallel operation generators .............................................................. ............................................................. .............................. 3-3 Passenger vessels ................................................................ .............................................................. ................... 14-1 Peak short-circuit current .................................................................. ......................................................... ............ 5-1 Phase failure protection ........... ................................................................ ......................................................... .. 20-11 Pilot transfer .............................................................................................. ........................................................ ... 11-1 Pipe tunnels ......................................................................... ............................................................. .................... 11-1 Pitch propellers ............................................................... ................................................................. ...................... 7-4 Plain bearings ..................................................................................... ....................................................... ........... 20-1









Chapter 3 Page 16

Index

I - Part 1 GL 2010

steering gear .......................................................... .................................................................. ......................... 7-2 Protection Equipment power electronics ..................... ................................................................. ....................................................... 6-2 Protective devices ............................................................................... ........................................................... ........ 1-3 Protective earthing ................................................................................. ........................................................ ...... 1-13 Protective measures ...................................................... ............................................................... ........................ 1-12 Public address (PA) systems systems passenger vessels ....................................................... ............................................................. ....................... 14-3 Public address system .................... ................................................................. ....................................................... 9-7

R Radio equipment ................................................................................................ .................................................... 4-6 Ranges ............................................................................................................................................................... 20-14 Reactance Coils .......................................................................... ... ....................................................................... .......................................................... ............... 20-7 Rectifier ................................................................................................................................................................. 6-1 Refrigerated rooms .......................... ................................................................. ................................................... 12-6 Refrigeration spaces .............................................................. ............................................................... ............... 12-8 Regulating electrical propulsion plants ....................................................................... ..................................................... 13-2 Relays .................................................................................................................................................................... 8-7 Remote control of the main engine ....................................................................... ................................................. 9-4











I - Part 1 GL 2010

Index

Chapter 3 Page 17

Separators ........................................................................................................... ................................................... 7-5 7-5 Shaft-driven generators ... ................................................................. .......................................................... ............ 3-4 Shafts .............................................................. ............................................................... ...................................... 20-1 Shell doors Ro/Ro-ships ......................................................... ............................................................... ............................ 16-1 Ship safety systems .............................................................. ........................................................... ................ 4-5, 9-6 Ships' mains electrical propulsion plants .............................................................................. ............................................... 13-2 Ship's safety systems passenger vessels .................................................. ............................................................... ........................... 14-3 Shore connection ........................................................................................... ..................................................... .... 4-3 Short-circuit protection ................................................................. ........................................................ ...... 5-5, 20-11 generators .............................................................. ............................................................. .............................. 4-1 Short-circuit test









Chapter 3 Page 18

Index

I - Part 1 GL 2010

generators ......................................................................................................................................................... 3-2 Steady short-circuit current generators ......................................................................................................................................................... 3-3 Steering gear .......................................................................... ............................................................... ................. 7-1 control systems ............................................................ ............................................................. ........................ 7-2 passenger vessels ....................................................... ............................................................. ....................... 14-2 Steering propeller .................................................................... ............................................................. ................. 7-3 Stern doors Ro/Ro-ships ................................................................................................................................................... 16-2 Storage batteries ........................................................... ............................................................. ................... 4-3, 20-9 installation ........................................................................................................................................................ 2-2 Sub-distribution boards installation ........................................................................................................................................................ 2-5 Supply systems









I - Part 1 GL 2010

Index

Chapter 3 Page 19

Transitional source of emergency power ......................................................................... ...................................... 3-6 Turning gear ....................................................................... .............................................................. ...................... 7-5 Type approvals .......................................................... ............................................................. ..................... 18-3, 21-3

U Unattended machinery spaces .............................................................................. ................................................ 9-10 Underfrequency protection generators .............................................................. ............................................................. .............................. 4-2 Undervoltage protection .................................................................. ........................................................ ........... 20-11 generators .............................................................. ............................................................. .............................. 4-1 Utilization category ............................................................................ ....................................................... ............. 5-4

V

Electrical Installation Rules for Ships

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