IEC 61892-3:2019

IEC 61892-3 ®
Edition 4.0 2019-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Mobile and fixed offshore units – Electrical installations –
Part 3: Equipment
Unités mobiles et fixes en mer – Installations électriques –
Partie 3: Équipement
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IEC 61892-3 ®
Edition 4.0 2019-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Mobile and fixed offshore units – Electrical installations –

Part 3: Equipment
Unités mobiles et fixes en mer – Installations électriques –

Partie 3: Équipement
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 47.020.60 ISBN 978-2-8322-6668-7

– 2 – IEC 61892-3:2019 © IEC 2019
CONTENTS
FOREWORD . 6
INTRODUCTION . 8
1 Scope . 9
2 Normative references . 10
3 Terms and definitions . 13
4 General requirements . 15
4.1 General . 15
4.2 Access for maintenance, operation and inspection . 15
4.3 Access to interface . 16
4.4 Documentation . 16
4.5 Nameplates and labels . 16
4.6 Signal lamps . 16
4.7 Component and wiring identification (inside cabinet) . 16
4.7.1 Marking of components inside cabinet . 16
4.7.2 Internal wiring and marking of supplier's standard equipment . 17
4.7.3 Marking of internal wiring in project specific parts of equipment . 17
4.7.4 Marking of AC busbars . 17
4.7.5 Marking of DC busbars . 17
4.7.6 Marking of earth bars . 17
4.8 Enclosures/material . 17
4.9 Cabinet doors . 18
4.10 Protection against direct contact . 18
4.11 Protection against fluid leakage . 18
4.12 Ventilation/cooling by air . 18
4.13 Cooling by liquids . 19
4.13.1 General . 19
4.13.2 Forced cooling systems . 19
4.14 Earthing . 19
4.14.1 General . 19
4.14.2 PE bar . 20
4.14.3 IE bar . 20
4.14.4 IS bar . 22
4.14.5 Voltage and current transformers . 22
4.15 Electromagnetic compatibility and interference prevention means . 22
4.16 Termination of external cables/terminal design . 22
4.17 Internal wiring and terminations . 23
4.18 Control voltage . 23
4.19 Components' short-circuit rating . 23
4.20 Protection from condensation . 23
5 Generators and motors . 24
5.1 General . 24
5.2 Voltage regulation of generators . 24
5.2.1 General . 24
5.2.2 DC generators . 24
5.2.3 AC generators . 24
5.3 Generators for special purposes . 25

5.3.1 DC generators . 25
5.3.2 AC generators . 25
5.4 Parallel operation of general service generators – AC generators . 26
5.4.1 Reactive load sharing . 26
5.4.2 Active load sharing . 26
5.4.3 Flywheel effect for AC generators . 26
5.4.4 Excitation of AC generators . 26
5.5 Mechanical features (generators and motors) . 26
5.5.1 Cooling by liquid . 26
5.5.2 Accumulation of moisture and condensation . 27
5.5.3 Balance . 27
5.5.4 Shaft currents . 27
5.5.5 Terminals . 27
5.6 Lubrication (generators and motors) . 27
5.7 Prime movers . 27
5.7.1 General . 27
5.7.2 Speed governing characteristics . 28
5.8 Cyclic irregularity . 28
5.9 Lubrication (prime movers) . 29
5.10 Running speed . 29
5.11 Testing . 29
6 Transformers . 29
6.1 General . 29
6.2 Winding arrangement . 30
6.3 Terminals . 30
6.4 Cooling arrangement. 30
6.5 Liquid-immersed transformers not hermetically sealed . 30
6.6 Voltage regulation . 30
7 Switchgear and controlgear assemblies . 31
7.1 General . 31
7.2 Definitions. 31
7.3 Locking facilities . 31
7.4 Low-voltage switchgear and controlgear assemblies . 31
7.4.1 General . 31
7.4.2 Circuits . 31
7.4.3 Design and construction . 31
7.4.4 Design verification . 33
7.5 Switchgear and controlgear in the range above 1 kV to 52 kV . 33
7.5.1 General . 33
7.5.2 Service conditions . 33
7.5.3 Design and construction . 34
7.5.4 Circuit-breakers, switches and fuses. 34
7.5.5 Earthing and short-circuiting . 35
7.5.6 Protection against contact with live parts . 35
7.6 Switchgear and controlgear above 52 kV . 35
7.6.1 General . 35
7.6.2 Service conditions . 35
7.6.3 Design and construction . 35
7.6.4 Use of SF6 . 36

– 4 – IEC 61892-3:2019 © IEC 2019
7.6.5 Gas pressure and density monitoring . 36
7.6.6 Tightness . 36
7.6.7 Power connection . 36
7.6.8 Equipment handling . 36
7.7 Instruments for assemblies . 36
7.7.1 General . 36
7.7.2 Instrument for AC generators . 36
7.7.3 Instrument for DC power sources . 37
7.7.4 Instruments for UPS . 37
7.7.5 Instruments measuring the insulation level to earth . 37
7.7.6 Design of instruments . 37
7.7.7 Transformers provided for instrumentation, protection and control
circuits . 38
7.7.8 Synchronizing devices . 38
7.7.9 Speed governor . 38
8 Semiconductor converters . 38
8.1 General . 38
8.2 Cooling arrangements . 39
8.3 Service conditions . 39
8.4 Application . 39
8.4.1 Forced cooling . 39
8.4.2 Effects from and on the supply or load system . 39
8.5 Converter transformers . 40
9 Secondary cells and batteries . 40
9.1 General . 40
9.2 Types of batteries . 40
9.2.1 General . 40
9.2.2 Valve regulated acid batteries (VRLA) . 40
9.2.3 Nickel-cadmium batteries . 41
9.2.4 Vented lead-acid batteries . 41
9.2.5 Technology not described above . 41
9.3 Charging facilities . 41
9.4 Ventilation of secondary battery compartments . 41
10 Luminaires . 42
11 Heating and cooking appliances . 42
12 Resistance trace heating . 42
13 Communication . 42
13.1 General . 42
13.2 Safety requirements . 42
13.3 External communication systems . 42
13.4 Internal communication . 43
13.4.1 General . 43
13.4.2 Public address and general alarm systems . 43
13.4.3 Other internal communication requirements . 43
13.5 Safety and maintenance. 44
14 Control and instrumentation . 44
14.1 General . 44
14.2 Segregation . 45

14.3 Accessibility . 45
14.4 Replacement . 45
14.5 Non-interchangeability . 45
14.6 Cooling air . 45
14.7 Mechanical load on connecting devices . 45
14.8 Mechanical features of cabinets . 45
14.9 Shock and vibration absorbers . 45
14.10 Internal wiring . 45
14.11 Cable terminations . 45
14.12 Sensors . 46
14.13 Reliability . 46
14.14 Hardware modularity . 46
14.15 Ancillary devices . 46
14.16 Power supplies . 46
14.17 Testing . 46
14.18 Spares . 47
15 Accessories for accommodation and similar areas . 47
15.1 General . 47
15.2 Switches . 47
15.3 Socket-outlets and plugs . 47
Bibliography . 49

Figure 1 – Typical example of PE, IE and IS bars with earth loop . 21
Figure 2 – Typical example of PE and combined IE and IS bars without earth loop . 21

Table 1 – Earth conductors for enclosures . 19
Table 2 – Limits of cyclic irregularity . 28

– 6 – IEC 61892-3:2019 © IEC 2019
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MOBILE AND FIXED OFFSHORE UNITS –
ELECTRICAL INSTALLATIONS –
Part 3: Equipment
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
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agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
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3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
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between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
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5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
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6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
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expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
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 fourth edition cancels and replaces the third edition published in 2012. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) the previous voltage limitations have been removed;
b) Clause 4 has been completely rewritten, giving general requirements as to relevant
electrical equipment;
c) requirements concerning pyrotechnic fault current limiters have been added;
d) requirements as to gas insulated switchgear have been added;

e) the requirement concerning the isolation of supply to galley has been moved to
IEC 61892-2;
f) requirements concerning control and instrumentation have been rewritten, based on
changes in IEC 61892-2.
The text of this International Standard is based on the following documents:
FDIS Report on voting
18/1651/FDIS 18/1667/RVD
Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all the parts in the IEC 61892 series, published 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 document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
– 8 – IEC 61892-3:2019 © IEC 2019
INTRODUCTION
IEC 61892 forms a series of International Standards for safety in the design, selection,
installation, maintenance and use of electrical equipment for the generation, transmission,
storage, distribution and utilization of electrical energy for all purposes in offshore units which
are used for the purpose of exploration or exploitation of petroleum resources.
This part of IEC 61892 incorporates and coordinates, as far as possible, existing rules and
forms a code of interpretation, where applicable, of the requirements of the International
Maritime Organization (IMO), and constitutes a guide for future regulations which may be
prepared and a statement of practice for offshore unit owners, designers, installers and
appropriate organizations.
This document is based on solutions and methods which are in current use, but it is not
intended to impede development of new or improved techniques.
In this revision, voltage limitations have been removed. However, voltage limitations may be
given in the referenced equipment standards. The removal of voltage limitations is considered
necessary due to the interconnection of, and supply from shore to offshore units. In such
cases, transmission voltages up to 132 kV AC and 150 kV DC are used and higher voltages
are being planned.
The IEC 61892 series aims to constitute a set of International Standards for the offshore
petroleum industry, but it is not intended to prevent their use beyond petroleum installations.

MOBILE AND FIXED OFFSHORE UNITS –
ELECTRICAL INSTALLATIONS –
Part 3: Equipment
1 Scope
This part of IEC 61892 is applicable to electrical equipment in mobile and fixed offshore units
including pipeline, pumping or "pigging" stations, compressor stations and single buoy
moorings, used in the offshore petroleum industry for drilling, production, accommodation,
processing, storage and offloading purposes.
It applies to all installations, whether permanent, temporary, transportable or hand-held, to AC
installations and DC installations without any voltage level limitation. Referenced equipment
standards may give voltage level limitations.
This document specifies requirements such as those concerning
– enclosures, with regard to material, marking (nameplates and labels), ventilation, earthing,
EMC and short-circuit rating of components, and
– specific requirements related to use in an offshore unit, such as
• generators and motors,
• transformers,
• switchgear and control gear assemblies,
• instrumentation of power sources,
• semiconductor converters,
• secondary cells and batteries,
• luminaires,
• communication equipment,
• control and instrumentation, and
• accessories for accommodation and similar areas.
This document does not apply to
– fixed equipment for medical purposes,
– electrical installations of tankers, and
– control of ignition sources other than those created by electrical equipment.
NOTE 1 For medical rooms, IEC 60364-7-710 provides specific requirements. Requirements for tankers are given
in IEC 60092-502.
NOTE 2 Specific requirements in relation to electrical equipment in hazardous areas are given in IEC 61892-7.
NOTE 3 Guidance on protection of non-electrical equipment can be found in ISO 80079-36, ISO 80079-37 and
IMO 2009 MODU Code, 6.7.
– 10 – IEC 61892-3:2019 © IEC 2019
2 Normative references
The following documents are referred to in the text in such a way that some or all of their
content constitutes requirements of this document. 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 heights 56 mm and higher – Measurement, evaluation and limits of
vibration severity
IEC 60076 (all parts), Power transformers
IEC 60076-11, Power transformers – Part 11: Dry-type transformers
IEC 60146-1-1, Semiconductor converters – General requirements and line commutated
converters – Part 1-1: Specification of basic requirements
IEC TR 60146-1-2, Semiconductor converters – General requirements and line commutated
converters – Part 1-2: Application guide
IEC 60146-1-3, Semiconductor converters – General requirements and line commutated
converters – Part 1-3: Transformers and reactors
IEC 60146-2, 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 60309-1, Plugs, socket-outlets and couplers for industrial purposes – Part 1: General
requirements
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, 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 60335-1, Household and similar electrical appliances – Safety – Part 1: General
requirements
IEC 60519-10, Safety in electroheating 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: Particular requirements. Section One: 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
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, Secondary cells and batteries containing alkaline or other non-acid electrolytes –
Sealed nickel-cadmium prismatic rechargeable single cells
IEC 60623, Secondary cells and batteries containing alkaline or other non-acid electrolytes –
Vented 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, Stationary lead-acid batteries – Part 11: Vented types – General requirements
and methods of tests
IEC 60896-21, Stationary lead-acid batteries – Part 21: Valve regulated types – Methods of
test
IEC 60896-22, 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 60945, Maritime navigation and radiocommunication equipment and systems – General
requirements – Methods of testing and required test results
IEC 60947-2, Low-voltage switchgear and controlgear – Part 2: Circuit-breakers
IEC 60947-3, Low-voltage switchgear and controlgear – Part 3: Switches, disconnectors,
switch-disconnectors and fuse-combination units
IEC 60947-4-1, 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 61378-1, Converter transformers – Part 1: Transformers for industrial applications

– 12 – IEC 61892-3:2019 © IEC 2019
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 61558 (all parts), Safety of transformers, reactors, power supply units and combinations
thereof
IEC TR 61641:2014, 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
IEC 61869-2, Instrument transformers – Part 2: Additional requirements for current
transformers
IEC 61869-3, Instrument transformers – Part 3: Additional requirements for inductive voltage
transformers
IEC 61892-1:2019, 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 62040-2, Uninterruptible power systems (UPS) – Part 2: Electromagnetic compatibility
(EMC) requirements
IEC 62259, Secondary cells and batteries containing alkaline or other non-acid electrolytes –
Nickel-cadmium prismatic secondary single cells with partial gas recombination
IEC 62262, Degree of protection provided by enclosures for electrical equipment against
external mechanical impacts (IK code)
IEC 62271-100, High-voltage switchgear and controlgear – Part 100: Alternating current
circuit-breakers
IEC 62271-102, High-voltage switchgear and controlgear – Part 102: Alternating current
disconnectors and earthing switches
IEC 62271-106, 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 62271-201:2014, High-voltage switchgear and controlgear – Part 201: AC solid-insulation
enclosed switchgear and controlgear for rated voltages above 1 kV and up to and including
52 kV
IEC 62271-203:2011, High-voltage switchgear and controlgear – Part 203: Gas-insulated
metal-enclosed switchgear for rated voltages above 52 kV

IEC TR 62778:2014, Application of IEC 62471 for the assessment of blue light hazard to light
sources and luminaires
IEC 62395-1, Electrical resistance trace heating systems for industrial and commercial
applications – Part 1: General and testing requirements
IEC 62485-2, Safety requirements for secondary batteries and battery installations – Part 2:
Stationary batteries
IMO, International Convention for the Safety of Life at Sea (SOLAS), consolidated edition
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 61892-1 and the
following apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
converter
device for changing one or more characteristics associated with electric energy
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, modified – The wording in brackets "(electric
energy)" has been omitted from the term.]
3.2
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, 426-20-39]
3.3
electromagnetic compatibility
EMC
ability of an apparatus or system to function satisfactorily in its electromagnetic environment
without introducing intolerable electromagnetic disturbances to anything in that environment
[SOURCE: IEC 60050-161:2018, 161-01-07]
3.4
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
...