IEC 61892-3:2012

Mobile and fixed offshore units - Electrical installations - Part 3: Equipment

IEC 61892-3:2012(E) contains provisions for electrical equipment in mobile and fixed offshore units including pipeline, pumping or 'pigging' stations, compressor stations and exposed location single buoy moorings, used in the offshore petroleum industry for drilling, processing and for storage purposes. This standard applies to equipment in all installations, whether permanent, temporary, transportable or hand-held, to a.c. installations up to and including 35 000 V and d.c. installations up to and including 1 500 V (a.c. and d.c. voltages are nominal values). This standard sets requirements for equipment, which are additional to the requirements given in the product standard for the relevant equipment. This standard does not apply to the electrical installations in rooms used for medical purposes or in tankers. This edition includes the following significant technical changes with respect to the previous edition:
a) Table 4 in the previous edition of IEC 61892-3 regarding type testing has been deleted. Information regarding environmental conditions, including requirements to vibration, is now given in Clause 4;
b) for liquid immersed transformers requirement for overheating alarm and shut down has been added;
c) requirements for low voltage switchgear and controlgear have been rewritten, based on IEC 61439-1 and IEC 61439-2. Only additional requirements to those given in IEC 61439 are given in the standard;
d) requirements to low voltage circuit breakers, switches, contactors and fuses have been added;
e) requirement for subdivision of high voltage switchboard has been added;
f) requirements for luminaires have been deleted and replaced with reference to IEC 60598 series and IEC 60092-306;
g) requirements for heating and cooking appliances have been deleted and replaced with reference to IEC 60335 series;
h) requirement for portable equipment has been added.

General Information

• Status: Published
• Publication Date: 14-Mar-2012
• ICS: 47.020.60 - Electrical equipment of ships and of marine structures
• Technical Committee: TC 18 - Electrical installations of ships and of mobile and fixed offshore units
• Drafting Committee: MT 18 - TC 18/MT 18
• Current Stage: DELPUB - Deleted Publication
• Start Date: 09-Apr-2019
• Completion Date: 26-Oct-2025

Relations

• Revises: IEC 61892-3:2007 - Mobile and fixed offshore units - Electrical installations - Part 3: Equipment
• Effective Date: 05-Sep-2023
• Revised: IEC 61892-3:2019 - Mobile and fixed offshore units - Electrical installations - Part 3: Equipment
• Effective Date: 05-Sep-2023

Overview

IEC 61892-3:2012 - Mobile and fixed offshore units: Electrical installations - Part 3: Equipment defines equipment-level requirements for electrical plant used in the offshore petroleum industry. It covers electrical equipment on mobile and fixed offshore units (including pipeline/pumping or “pigging” stations, compressor stations and exposed single buoy moorings) used for drilling, processing and storage. The standard applies to a.c. installations up to 35 000 V and d.c. installations up to 1 500 V (nominal). It applies to permanent, temporary, transportable and hand‑held equipment, but excludes medical rooms and tankers.

Keywords: IEC 61892-3, offshore electrical installations, mobile and fixed offshore units, offshore equipment standard.

Key topics and technical requirements

• Scope of equipment: Generators, motors, transformers, switchgear and controlgear assemblies, semiconductor converters, secondary cells and batteries, luminaires, heating/cooking appliances, portable equipment, underwater systems, communication and control instrumentation.
• Environmental and mechanical conditions: Environmental data (temperature, vibration, moisture, condensation) and degree of protection requirements are given (see Clause 4). This edition removed the previous Table 4 and relocated environmental/test criteria into Clause 4.
• Safety & marking: Nameplates, labels, terminations, EMC and voltage/frequency variation requirements are specified for offshore service conditions.
• Power equipment specifics: Requirements for generator regulation, parallel operation, transformer cooling and voltage regulation, and new overheating alarm/shutdown requirement for liquid‑immersed transformers.
• Switchgear & controlgear: Low-voltage switchgear requirements have been rewritten and aligned with IEC 61439‑1/2 - the standard now provides only additional requirements to IEC 61439. New rules for low-voltage circuit breakers, switches, contactors and fuses and subdivision of high-voltage switchboards are included.
• Referenced product standards: Luminaires and heating/cooking appliances are now addressed by reference to the IEC 60598 series, IEC 60092‑306, and IEC 60335 series respectively.
• Portable equipment: New requirements for portable equipment were added in this edition.

Practical applications

• Design and specification of offshore electrical equipment and cabinets for rigs, platforms and floating units.
• Equipment selection, procurement and factory acceptance testing to ensure suitability for offshore environmental conditions.
• Installation, maintenance and inspection guidance for electrical engineers and technicians working on offshore power systems.
• Risk assessment and compliance documentation for HSE teams and classification societies.

Who uses this standard

• Offshore electrical and control systems engineers
• Equipment manufacturers and suppliers
• Classification societies and certifying bodies
• EPC contractors, operations & maintenance teams, and HSE engineers

Related standards

• IEC 61439‑1 / IEC 61439‑2 (low-voltage switchgear and controlgear)
• IEC 60598 series (luminaires)
• IEC 60092‑306 (shipboard/offshore lighting)
• IEC 60335 series (heating and cooking appliances)

This standard is essential for anyone specifying, manufacturing, certifying or maintaining electrical equipment for the offshore petroleum sector who needs IEC-compliant, environment-suitable equipment.

Standards Content (Sample)

IEC 61892-3 ®
Edition 3.0 2012-03
INTERNATIONAL
STANDARD
Mobile and fixed offshore units – Electrical installations –
Part 3: Equipment
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IEC 61892-3 ®
Edition 3.0 2012-03
INTERNATIONAL
STANDARD
Mobile and fixed offshore units – Electrical installations –

Part 3: Equipment
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
XA
ICS 47.020.60 ISBN 978-2-88912-991-1

– 2 – 61892-3 © IEC:2012(E)
CONTENTS
FOREWORD . 6

INTRODUCTION . 8

1 Scope . 9

2 Normative references . 9

3 Terms and definitions . 12

4 General requirements . 15

4.1 Environmental conditions . 15
4.1.1 General . 15
4.1.2 Ambient air temperature . 15
4.1.3 Temperature rise . 15
4.1.4 Vibration . 15
4.2 Degree of protection . 16
4.3 Nameplates and labels . 16
4.4 Voltage and frequency variations . 16
4.5 Electromagnetic compatibility . 17
4.6 Terminations . 17
5 Generators and motors . 17
5.1 General . 17
5.2 Voltage regulation of generators . 17
5.2.1 General . 17
5.2.2 DC generators . 18
5.2.3 AC generators . 18
5.3 Generators for special purposes . 19
5.3.1 DC generators . 19
5.3.2 AC generators . 19
5.4 Parallel operation of general service generators – AC generators. 19
5.4.1 Reactive load sharing . 19
5.4.2 Load sharing . 19
5.4.3 Flywheel effect for a.c. generators . 19
5.4.4 Excitation of a.c. generators . 20
5.5 Mechanical features (generators and motors) . 20

5.5.1 Entry of water . 20
5.5.2 Accumulation of moisture and condensation . 20
5.5.3 Balance . 20
5.5.4 Shaft currents . 20
5.5.5 Terminals . 21
5.6 Lubrication (generators and motors) . 21
5.7 Prime movers . 21
5.7.1 General . 21
5.7.2 Speed governing characteristics . 21
5.7.3 Flywheel effect . 22
5.8 Cyclic irregularity . 22
5.9 Lubrication (prime movers) . 22
5.10 Running speed . 23
5.11 Testing . 23

61892-3 © IEC:2012(E) – 3 –
6 Transformers for power and lighting . 23

6.1 General . 23

6.2 Winding arrangement . 24

6.3 Terminals . 24

6.4 Cooling arrangement . 24

6.5 Voltage regulation . 24

6.6 Tests . 24

7 Switchgear and controlgear assemblies . 25

7.1 Service conditions . 25

7.2 Definitions . 25
7.3 Locking facilities . 25
7.4 Low-voltage switchgear and controlgear assemblies . 25
7.4.1 General . 25
7.4.2 Temperature rise . 25
7.4.3 Circuits . 25
7.4.4 Marking of parts . 26
7.4.5 Design and construction . 26
7.4.6 Barriers between generator sections. 28
7.4.7 Internal electrical circuits and connections . 28
7.4.8 Design verification . 29
7.5 Switchgear and controlgear in the range above 1 kV up to and including
35 kV . 30
7.5.1 General . 30
7.5.2 Service conditions . 30
7.5.3 Ratings . 30
7.5.4 Design and construction . 30
7.5.5 Degree of protection provided by enclosures . 30
7.5.6 Circuit breakers, switches and fuses . 30
7.5.7 Earthing and short-circuiting . 31
7.5.8 Protection against live parts . 31
7.5.9 Internal wiring . 31
7.5.10 Auxiliary systems . 31
7.6 Instruments for assemblies . 31
7.6.1 General . 31
7.6.2 Instrument for a.c. generators . 32

7.6.3 Instrument for d.c. power sources . 32
7.6.4 Instruments measuring the insulation level to earth . 32
7.6.5 Design of instruments . 32
7.6.6 Transformers provided for instrumentation, protection and control
circuits. 33
7.6.7 Selection of protective devices . 33
7.6.8 Synchronizing devices . 33
7.6.9 Speed governor . 33
8 Semiconductor converters . 33
8.1 General . 33
8.2 Internal wiring . 34
8.3 Cooling arrangements . 34
8.4 Accessibility . 34
8.5 Service conditions . 34

– 4 – 61892-3 © IEC:2012(E)
8.6 Application . 35

8.6.1 Forced cooling . 35

8.6.2 Effects from and on the supply or load system . 35

8.7 Diagrams . 35

8.8 Converter transformers . 35

9 Secondary cells and batteries . 36

9.1 General . 36

9.2 Types of batteries . 36

9.2.1 General . 36

9.2.2 Valve-regulated acid batteries (VRLA) . 36
9.2.3 Nickel-cadmium batteries . 36
9.3 Charging facilities . 36
9.4 Ventilation of secondary battery compartments . 37
10 Luminaires . 37
10.1 General . 37
10.2 Luminaires for hazardous areas . 37
11 Heating and cooking appliances . 37
11.1 Construction . 37
11.2 Isolation of supply to galley . 37
12 Resistance trace heating . 37
13 Communication. 38
13.1 General . 38
13.2 Safety requirements . 38
13.3 External communication systems . 38
13.4 Internal communication . 38
13.4.1 General . 38
13.4.2 Public address and general alarm systems . 38
13.4.3 Other internal communication requirements . 39
13.5 Safety and maintenance . 39
14 Underwater systems and appliances. 40
14.1 General . 40
14.2 Fixed diving systems . 40
14.3 Temporary diving systems . 40
15 Control and instrumentation . 40

15.1 General . 40
15.2 General requirements . 40
15.2.1 Operation . 40
15.2.2 Reliability . 40
15.2.3 Stability . 41
15.2.4 Repeatability and accuracy . 41
15.2.5 Segregation . 41
15.3 Adjustments . 41
15.4 Accessibility. 41
15.5 Replacement . 41
15.6 Non-interchangeability . 41
15.7 Cooling air . 41
15.8 Mechanical load on connecting devices . 41
15.9 Mechanical features of cabinets . 42

61892-3 © IEC:2012(E) – 5 –
15.10 Shock and vibration absorbers . 42

15.11 Internal wiring . 42

15.12 Cable connections . 42

15.13 Sensors . 42

15.13.1 Performance . 42

15.13.2 Response time . 42

15.13.3 Reliability . 42

15.14 Computer-based systems . 42

15.14.1 Safety applications . 43

15.14.2 Hardware modularity . 43

15.14.3 Memory . 43
15.14.4 Ancillary devices . 43
15.14.5 Power supplies . 43
15.14.6 Computer communications . 43
15.14.7 Monitoring and fault diagnosis . 44
15.14.8 Man-machine interface . 44
15.14.9 Software . 45
15.14.10 Precautions against design failures. 45
15.14.11 Testing . 45
15.14.12 Manuals . 45
15.14.13 Spares . 46
16 Accessories . 46
16.1 General . 46
16.2 Enclosures . 46
16.3 Switches . 46
16.4 Socket-outlets and plugs . 47
17 Portable equipment . 48
Annex A (informative) Alternative method of power generation . 49
Bibliography . 55

Figure A.1 – PV Power generating system – Major functional elements, sub-systems
and power flow diagram . 50
Figure A.2 – Power generating system – Major functional elements . 51
Figure A.3 – CCVT operating principle block diagram . 53

Figure A.4 – Micro turbine typical block diagram . 54

Table 1 – Limits of cyclic irregularity . 22
Table 2 – Clearance and creepage distances for assemblies not verified by testing . 27

– 6 – 61892-3 © IEC:2012(E)
INTERNATIONAL ELECTROTECHNICAL COMMISSION

____________
MOBILE AND FIXED OFFSHORE UNITS –

ELECTRICAL INSTALLATIONS –
Part 3: Equipment
FOREWORD
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 61892-3 has been prepared by IEC technical committee 18:
Electrical installations of ships and of mobile and fixed offshore units.
This third edition cancels and replaces the second edition published in 2007. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) Table 4 in the previous edition of IEC 61892-3 regarding type testing has been deleted.
Information regarding environmental conditions, including requirements to vibration, is
now given in Clause 4;
b) for liquid immersed transformers requirement for overheating alarm and shut down has
been added;
61892-3 © IEC:2012(E) – 7 –
c) requirements for low voltage switchgear and controlgear have been rewritten, based on

IEC 61439-1 and IEC 61439-2. Only additional requirements to those given in IEC 61439

are given in the standard;
d) requirements to low voltage circuit breakers, switches, contactors and fuses have been

added;
e) requirement for subdivision of high voltage switchboard has been added;

f) requirements for luminaires have been deleted and replaced with reference to IEC 60598

series and IEC 60092-306;
g) requirements for heating and cooking appliances have been deleted and replaced with

reference to IEC 60335 series;

h) requirement for portable equipment has been added.
The text of this standard is based on the following documents:
FDIS Report on voting
18/1241/FDIS 18/1256/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all the parts of the IEC 61892 series, under the general title Mobile and fixed offshore
units – Electrical installations, can be found on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.

– 8 – 61892-3 © IEC:2012(E)
INTRODUCTION
IEC 61892 forms a series of International Standards intended to enable safety in the design,

selection, installation, maintenance and use of electrical equipment for the generation,

storage, distribution and utilisation of electrical energy for all purposes in offshore units which

are being used for the purpose of exploration or exploitation of petroleum resources.

This part of IEC 61892 also incorporates and co-ordinates, as far as possible, existing rules

and forms a code of interpretation, where applicable, of the requirements of the International

Maritime Organisation (IMO), a guide for future regulations which may be prepared and a

statement of practice for offshore unit owners, constructors and appropriate organisations.

This standard is based on equipment and practices which are in current use but it is not
intended in any way to impede the development of new or improved techniques.
The ultimate aim has been to produce a set of International standards exclusively for the
offshore petroleum industry.
61892-3 © IEC:2012(E) – 9 –
MOBILE AND FIXED OFFSHORE UNITS –

ELECTRICAL INSTALLATIONS –
Part 3: Equipment
1 Scope
This part of IEC 61892 contains provisions for electrical equipment in mobile and fixed
offshore units including pipeline, pumping or 'pigging' stations, compressor stations and
exposed location single buoy moorings, used in the offshore petroleum industry for drilling,
processing and for storage purposes.
This standard applies to equipment in all installations, whether permanent, temporary,
transportable or hand-held, to a.c. installations up to and including 35 000 V and d.c.
installations up to and including 1 500 V (a.c. and d.c. voltages are nominal values).
This standard sets requirements for equipment, which are additional to the requirements
given in the product standard for the relevant equipment.
This standard does not apply to the electrical installations in rooms used for medical purposes
or in tankers.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and
are indispensable for its application. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 60034-1 , Rotating electrical machines – Part 1: Rating and performance
IEC 60034-14 Rotating electrical machines – Part 14: Mechanical vibration of certain
machines with shaft height 56 mm and higher – Measurement, evaluation and limits of
vibration severity
IEC 60044-1, Instrument transformers – Part 1: Current transformers

IEC 60065, Audio, video and similar electronic apparatus – Safety requirements
IEC 60076-1, Power transformers – Part 1: General
IEC 60076-5, Power transformers – Part 5: Ability to withstand short circuit
IEC 60076-6, Power transformers – Part 6: Reactors
IEC 60076-7, Power transformers – Part 7: Loading guide for oil-immersed power
transformers
IEC 60076-8, Power transformers – Part 8: Application guide
IEC 60076-11, Power transformers – Part 11: Dry-type transformers

– 10 – 61892-3 © IEC:2012(E)
IEC 60076-12, Power transformers – Part 12: Loading guide for dry-type power transformers

IEC 60092-306:2009, Electrical installations in ships – Part 306: Equipment – Luminaires and

lighting accessories
IEC 60146-1-1:2009, Semiconductor converters – General requirements and line commutated

converters – Part 1-1: Specification of basic requirements

IEC/TR 60146-1-2:2011, Semiconductor converters – General requirements and line

commutated converters – Part 1-2: Application guide

IEC 60146-1-3:1991, Semiconductor converters – General requirements and line commutated
converters – Part 1-3: Transformers and reactors
IEC 60146-2:1999, Semiconductor converters – Part 2: Self-commutated semiconductor
converters including direct d.c. converters
IEC 60269-1, Low-voltage fuses – Part 1: General requirements
IEC 60269-3, Low-voltage fuses – Part 3: Supplementary requirements for fuses for use by
unskilled persons (fuses mainly for household or similar applications) – Examples of
standardized systems of fuses A to F
IEC/TR 60269-5 Low-voltage fuses – Part 5: Guidance for the application of low-voltage fuses
IEC 60282-1, High-voltage fuses – Part 1: Current-limiting fuses
IEC 60282-2, High-voltage fuses – Part 2: Expulsion fuses
IEC 60309-4, Plugs, socket-outlets and couplers for industrial purposes – Part 4: Switched
socket-outlets and connectors with or without interlock
IEC 60331 (all parts), Tests for electric cables under fire conditions – Circuit integrity
IEC 60332-1-2:2004, Tests on electric and optical fibre cables under fire conditions – Part 1-
2: Test for vertical flame propagation for a single insulated wire or cable – Procedure for 1 kW
pre-mixed flame
IEC 60335 (relevant parts), Household and similar electrical appliances

IEC 60519-10, Safety in electroheat installations – Part 10: Particular requirements for
electrical resistance trace heating systems for industrial and commercial applications
IEC 60529, Degrees of protection provided by enclosures (IP Code)
IEC 60598-1, Luminaires – Part 1: General requirements and tests
IEC 60598-2-1, Luminaires – Part 2-1: Particular requirements – Fixed general purpose
luminaires
IEC 60598-2-2, Luminaires – Part 2-2: Particular requirements – Recessed luminaires
IEC 60598-2-5, Luminaires – Part 2-5: Particular requirements – Floodlights
___________
”Relevant parts” are those parts of the standards which are relevant for use on mobile and fixed offshore units.

61892-3 © IEC:2012(E) – 11 –
IEC 60598-2-6, Luminaires – Part 2: Particular requirements – Section 6: Luminaires with

built-in transformers for filament lamps

IEC 60598-2-22, Luminaires – Part 2-22: Particular requirements – Luminaires for emergency

lighting
IEC/TR 60616, Terminal and tapping markings for power transformers

IEC 60622:2002, Secondary cells and batteries containing alkaline or other non-acid

electrolytes – Sealed nickel-cadmium prismatic rechargeable single cells

IEC 60669 (all parts), Switches for household and similar fixed-electrical installations
IEC 60884 (all parts), Plugs and socket-outlets for household and similar purposes
IEC 60896-11:2002, Stationary lead-acid batteries – Part 11: Vented types – General
requirements and methods of tests
IEC 60896-21:2004, Stationary lead-acid batteries – Part 21: Valve regulated types – Methods
of test
IEC 60896-22:2004, Stationary lead-acid batteries – Part 22: Valve regulated types –
Requirements
IEC 60906 (all parts), IEC system of plugs and socket-outlets for household and similar
purposes
IEC 60947-2:2006, Low-voltage switchgear and controlgear – Part 2: Circuit-breakers
IEC 60947-3:2008, Low-voltage switchgear and controlgear – Part 3: Switches, disconnectors,
switch-disconnectors and fuse-combination units
IEC 60947-4-1:2009, Low-voltage switchgear and controlgear – Part 4-1 Contactors and
motor-starters – Electromechanical contactors and motor-starters
IEC 61097 (all parts), Global maritime distress and safety system (GMDSS)
IEC 61131-1, Programmable controllers – Part 1: General information
IEC 61131-2, Programmable controllers – Part 2: Equipment requirements and tests
IEC 61378-1:2011, Converter transformers – Part 1: Transformers for industrial applications
IEC 61439-1:2011, Low-voltage switchgear and controlgear assemblies – Part 1: General
rules
IEC 61439-2:2011, Low-voltage switchgear and controlgear assemblies – Part 2: Power
switchgear and controlgear assemblies
IEC/TR 61641:2008, Enclosed low-voltage switchgear and controlgear assemblies – Guide for
testing under conditions of arcing due to internal fault
IEC 61800 (all parts), Adjustable speed electrical power drive systems

– 12 – 61892-3 © IEC:2012(E)
IEC 61869-3, Instrument transformers – Part 3: Additional requirements for inductive voltage

transformers
IEC 61892-1:2010, Mobile and fixed offshore units – Electrical installations – Part 1: General

requirements and conditions
IEC 61892-2, Mobile and fixed offshore units – Electrical installations – Part 2: System design

IEC 61892-5, Mobile and fixed offshore units – Electrical installations – Part 5: Mobile units

IEC 61892-7, Mobile and fixed offshore units – Electrical installations – Part 7: Hazardous

areas
IEC 62040-2, Uninterruptible power systems (UPS) – Part 2: Electromagnetic compatibility
(EMC) requirements
IEC 62262, Degree of protection provided by enclosures for electrical equipment against
external mechanical impacts (IK code)
IEC 62271-100:2008, High-voltage switchgear and controlgear – Part 100: Alternating-current
circuit-breakers
IEC 62271-102:2001, High-voltage switchgear and controlgear – Part 102: Alternating current
disconnectors and earthing switches
IEC 62271-106:2011, High-voltage switchgear and controlgear – Part 106: Alternating current
contactors, contactor-based controllers and motor-starters
IEC 62271-200:2011, High-voltage switchgear and controlgear – Part 200: AC metal-enclosed
switchgear and controlgear for rated voltages above 1 kV and up to and including 52 kV
IEC 62271-201:2006, High-voltage switchgear and controlgear – Part 201: AC insulation-
enclosed switchgear and controlgear for rated voltages above 1 kV and up to and including
52 kV
IEC 62395-1, Electrical resistance trace heating systems for industrial and commercial
applications – Part 1: General and testing requirements
IMO, Code of Safety for Diving Systems

3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 61892-1 and the
following apply.
3.1
computer-based system
system that consists of one or more programmable electronic devices with the connections,
peripherals and software necessary to automatically carry out specified functions
Note 1 to entry The following types of programmable devices could form part of a computer system: mainframe,
mini-computer, micro-computer, programmable logic controller.
3.2
converter
device for changing one or more characteristics associated with electric energy

61892-3 © IEC:2012(E) – 13 –
Note 1 to entry Characteristics associated with energy are for example voltage, number of phases and frequency

including zero frequency.
[SOURCE: IEC 60050-151:2001, 151-13-36]

3.3
trace heating
utilization of electric trace heater cables, pads, panels and support components, externally

applied and used to raise or maintain the temperature of contents in piping, tanks and

associated equipment
[SOURCE: IEC 60050-426:2008, 426-08-14]

3.4
electromagnetic compatibility
EMC
the ability of an equipment or system to function satisfactorily in its electromagnetic
environment without introducing intolerable electromagnetic disturbances to anything in that
environment
[SOURCE: IEC 60050-161:1990, 161-01-07]
3.5
emergency switchboard
switchgear and controlgear assembly which is normally supplied by the main switchboard but
which, in the event of failure of the main electrical power supply system, is directly supplied
by the emergency source of electrical power or the transitional source of emergency power
and is intended to distribute and control electrical energy to the emergency services for all
electrical consumers essential to the safety of the crew, contractors, visitors and the unit
under emergency conditions
3.6
expert system
knowledge-based system capable of solving problems in a particular domain or field of
application by drawing inferences from a knowledge base developed from expert knowledge
[SOURCE: IEC 60050-351:2006, 351-21-47, modified]
3.7
extra-low voltage
ELV
voltage which does not exceed 50 V a.c. r.m.s. between conductors, or between any
conductor and earth.
[SOURCE: IEC 60050-826:2004, 826-12-30, modified]
Note 1 to entry The voltage limit should not be exceeded, either at full load or no load, but it is assumed, for the
purpose of this definition, that any transformer or converter is operated at its rated supply voltage.
Note 2 to entry Information about protection by extra-low voltage is given in IEC 60364-4-41.
3.8
inverter
electric energy converter that changes direct electric current to single-phase or polyphase
alternating currents
[SOURCE: IEC 60050-151:2001, 151-13-46]

– 14 – 61892-3 © IEC:2012(E)
3.9
low-voltage switchgear and controlgear assembly

combination of one or more low-voltage switching devices together with associated control,

measuring, signalling, protective, regulating equipment, with all the internal electrical and

mechanical interconnections and structural parts

[SOURCE: IEC 61439-1:2011, 3.1.1]

3.10
main switchboard
switchgear and controlgear assembly which is directly supplied by the main source of

electrical power and is intended to distribute and control electrical energy to the unit’s

services
3.11
rectifier
electric energy converter that changes single-phase or polyphase alternating electric currents
to unidirectional current
[SOURCE: IEC 60050-151:2001, 151-13-45]
3.12
secondary cell
cell which is designed to be electrically recharged
[SOURCE: IEC 60050-482:2004, 482-01-03, modified]
3.13
semiconductor device
device the essential characteristics of which are due to the flow of charge carriers within one
or more semiconductor materials
[SOURCE: IEC 60050-151:2001, 151-13-63]
3.14
software
program, procedures and associated documentation pertaining to the operation of a computer
system and including both the application (user) program and the operating system (firmware)
program
3.15
valve regulated lead acid battery
VRLA
secondary battery in which cells are closed but have a valve
...