IEC 60092-507:2008
(Main)Electrical installations in ships - Part 507: Small vessels
Electrical installations in ships - Part 507: Small vessels
This part of IEC 60092 specifies requirements for the design, construction and installation of electrical systems in small vessels, which have a length of up to 50 m, or which have a gross registered tonnage not exceeding 500 GRT, designed for use on inland waters or at sea. It is not intended to apply to small craft equipped with a battery supplying circuits for engine starting and navigation lighting only, recharged from an inboard or outboard engine driven alternator.
This second edition cancels and replaces the first edition published in 2000. The significant technical changes with respect to the previous edition are:
- DC, AC single phase, and AC 3-phase systems are now included in one document.
- The standard now specifies requirements for electrical installations relevant to all small commercial or leisure vessels up to 50 m or which have a Gross Registered Tonnage (GRT) not exceeding 500 GRT designed for use on inland waters or at sea.
Installations électriques à bord des navires - Partie 507: Petits navires
La présente partie de la CEI 60092 spécifie les exigences pour la conception, la construction et l'installation des réseaux électriques à bord des petits navires dont la longueur ne dépasse pas 50 m et le tonnage brut 500 GRT (gross registered tonnage) qui sont conçus pour être utilisés dans les eaux intérieures ou en mer. Elle n'est pas destinée à s'appliquer aux petits navires équipés d'une batterie alimentant des circuits pour le démarrage d'un moteur et pour les feux de navigation uniquement, rechargée par un alternateur entraîné par un moteur en-bord ou hors-bord.
Cette deuxième édition annule et remplace la première édition publiée en 2000. Les modifications techniques majeures sont les suivantes par rapport à l'édition antérieure:
- Les réseaux monophasés à courant continu et à courant alternatif et les réseaux triphasés à courant alternatif sont maintenant regroupés dans un même document.
- La norme spécifie désormais les exigences pour les installations électriques applicables à tous les petits navires de commerce ou de plaisance jusqu'à 50 m ou dont le tonnage brut ne dépasse pas 500 GRT (gross registered tons) conçus pour être utilisés dans les eaux intérieures ou en mer.
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Standards Content (Sample)
IEC 60092-507
Edition 2.0 2008-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Electrical installations in ships –
Part 507: Small vessels
Installations électriques à bord des navires –
Partie 507: Petits navires
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IEC 60092-507
Edition 2.0 2008-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Electrical installations in ships –
Part 507: Small vessels
Installations électriques à bord des navires –
Partie 507: Petits navires
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
X
CODE PRIX
ICS 47.020.60 ISBN 2-8318-9499-9
– 2 – 60092-507 © IEC:2008
CONTENTS
FOREWORD.5
INTRODUCTION.7
1 Scope.8
2 Normative references .8
3 Terms and definitions .10
3.1 General .10
3.2 DC systems of distribution.11
3.3 AC systems of distribution .11
3.4 Protection.11
3.5 Equipment.13
4 General requirements .14
4.1 Ratings.14
4.2 Ambient air and cooling water temperature.14
4.3 Inclination of vessel.15
4.4 Voltage and frequency variations.15
4.5 Electrical power sources.16
4.6 Equipment.19
4.7 Electrical equipment and enclosures .19
4.8 Plugs and socket-outlets .21
4.9 Battery installation.22
4.10 Battery chargers.23
4.11 Internal communication circuits .23
4.12 Electrical apparatus for explosive gas atmospheres .23
4.13 Electrical fittings and cables attached to structures of another metal .24
4.14 Navigation lights supply.24
4.15 Luminaires .24
4.16 Electrical heating and cooking appliances .24
4.17 Magnetic compasses .24
5 Distribution systems .24
5.1 DC distribution systems.24
5.2 Standard a.c. distribution systems.24
5.3 Bonding conductors.25
5.4 Balance of loads in three-phase a.c. systems.26
5.5 Shore connection arrangements .26
6 Protection against electric shock in a.c. systems with voltage exceeding 50 V.27
6.1 Protection against direct contact .27
6.2 Automatic disconnection of supply to final circuit or equipment.27
6.3 Earthed neutral systems.27
6.4 Non-neutral earthed system (IT-type system) .27
6.5 Use of class II equipment .28
7 Protection against over-current and fault-current .28
7.1 General .28
7.2 Characteristics of protective devices .28
7.3 DC system.28
7.4 AC system.29
60092-507 © IEC:2008 – 3 –
7.5 Generators .29
7.6 Transformers.29
7.7 Motor protection .30
8 Diversity (demand) factor .30
8.1 Circuits other than final circuits .30
8.2 Application of diversity (demand) factors .30
8.3 Final circuits.30
8.4 Motor power circuits .30
9 Cables.30
9.1 Selection of cables .30
9.2 Determination of the cross-sectional areas of conductors .31
10 Cable and wiring installation and termination.35
10.1 Earth bonds.35
10.2 Cable terminations .36
10.3 Cable and conductor installation.36
10.4 DC and AC cabling and wiring segregation.37
10.5 Conductor identification.38
10.6 Lightning protection.38
11 Testing .39
11.1 General .39
11.2 Earthing .39
11.3 Insulation resistance .39
11.4 Switchgear and controlgear .40
11.5 Voltage drop.40
11.6 Internal communication circuits .40
11.7 Lighting, heating and galley equipment.40
12 Vessels over 24 m in length.40
12.1 Essential services .40
12.2 Capacity of the batteries.41
12.3 Earthing .41
12.4 Segregation of circuits.41
12.5 Battery charger protection .41
12.6 Protection against over current and fault current – Special applications .41
12.7 Navigation light supply .41
12.8 Radio and navigation equipment .42
12.9 Navigation, control, instrumentation and communication systems.42
12.10 Electric and electro-hydraulic steering gear .42
12.11 Electromagnetic compatibility .42
Annex A (informative) Power supply arrangements .43
Bibliography.48
Figure A.1 – Direct connection to a single phase mains supply .45
Figure A.2 – Direct connection to a single phase mains supply with an isolating
transformer on the vessel .45
Figure A.3 – Direct connection to a three phase mains supply .46
– 4 – 60092-507 © IEC:2008
Figure A.4 – Direct connection to a three phase mains supply with an isolating
transformer on the vessel .46
Figure A.5 – Connection to a single phase supply through a shore-mounted isolating
transformer .47
Table 1 – Design parameters – Temperature .14
Table 2 – Angular deviation and motion .15
Table 3 – AC voltages and frequencies for vessel's service systems of supply.16
Table 4 – Degree of protection in accordance with IEC 60529 .20
Table 5 – Minimum clearances and creepage distances for bare busbars .21
Table 6 – Reference currents for calculation of minimum ventilation .23
Table 7 – Recommended current ratings for single core cables in continuous service
(ambient temperature 45 °C).33
Table 8 – Correction factors for various ambient air temperatures.34
Table 9 – Correction factors for half-hour and one-hour service .34
60092-507 © IEC:2008 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTRICAL INSTALLATIONS IN SHIPS –
Part 507: Small vessels
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
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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 provides no marking procedure to indicate its approval and cannot be rendered responsible for any
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6) All users should ensure that they have the latest edition of this publication.
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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 60092-507 has been prepared by IEC technical committee 18:
Electrical installations of ships and of mobile and fixed offshore units.
This second edition cancels and replaces the first edition published in 2000 and constitutes a
technical revision.
This second edition includes the following significant technical changes with respect to the
previous edition:
a) DC, AC single phase, and AC 3-phase systems are now included in one document.
b) The standard now specifies requirements for electrical installations relevant to all small
commercial or leisure vessels up to 50 m or which have a Gross Registered Tonnage
(GRT) not exceeding 500 GRT designed for use on inland waters or at sea.
– 6 – 60092-507 © IEC:2008
The text of this standard is based on the following documents:
FDIS Report on voting
18/1067/FDIS 18/1073/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 60092 series, published under the general title Electrical
installations in ships, can be found on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the maintenance result 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.
60092-507 © IEC:2008 – 7 –
INTRODUCTION
This International Standard incorporates and coordinates, as far as possible, the existing
requirements for electrical installations relevant to small vessels as published in other parts of
the IEC 60092 series and the IEC 60364 series.
– 8 – 60092-507 © IEC:2008
ELECTRICAL INSTALLATIONS IN SHIPS –
Part 507: Small vessels
1 Scope
This part of IEC 60092 specifies requirements for the design, construction and installation of
electrical systems in small vessels, which have a length of up to 50 m, or which have a gross
registered tonnage not exceeding 500 GRT, designed for use on inland waters or at sea. It is
not intended to apply to small craft equipped with a battery supplying circuits for engine
starting and navigation lighting only, recharged from an inboard or outboard engine driven
alternator.
NOTE 1 For alternating current systems having voltages exceeding 250 V single-phase or 500 V three-phase, for
direct current systems exceeding 50 V, and for vessels larger than 500 GRT or with a length greater than 50 m,
other standards within the IEC 60092 series apply.
NOTE 2 Attention is drawn to regulations which govern specific requirements for navigation lights for small
vessels.
NOTE 3 Attention is drawn to the fact that, in some countries the EC Directives covering EMC (89/336/EEC), low
voltage (73/23/EEC) and general product safety (92/59/EEC) may be applied. In addition, Council Directive 97/70
applies to fishing vessels of 24 m in length and over, and Council Directive 98/18/EC applies to passenger ships.
Attention is also drawn to the recreational craft directive 94/25/EC and 2003/44/EF. For high speed crafts, attention
is drawn to the International code of safety for high-speed craft (HSC Code).
This standard applies to the following types of d.c. and a.c. electrical systems, individually or
in combination:
a) direct current system which operates at a nominal voltage not exceeding 50 V;
NOTE For example, for many small vessels, this will be the main electrical system. Alternatively, a vessel
equipped with an a.c. system as its principal electrical system may be also equipped with a d.c. system for
navigation and communications equipment supplied from batteries.
b) single-phase alternating current system which operates at a nominal voltage not
exceeding 250 V;
NOTE Such a system may be the principal electrical power system of a vessel or a system which may only be
energized when connected to a shore supply. AC extra-low voltage, safety extra-low voltage, and other circuits
may also comprise part of a single-phase a.c. system. A vessel may also be equipped with d.c. system(s) as in a)
above.
c) three-phase alternating current system which operates at a nominal voltage not exceeding
1 000 V.
NOTE The three-phase system is likely to be the principal electrical power system of a vessel’s electrical
installation. Such a vessel may also be equipped with single-phase a.c. subsystem(s) and d.c. subsystem(s).
2 Normative references
The following referenced documents are indispensable for the application 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 60079 (all parts), Explosive atmospheres
IEC 60092-101:1994, Electrical installations in ships – Part 101: Definitions and general
requirements
IEC 60092-201:1994, Electrical installations in ships – Part 201: System design – General
60092-507 © IEC:2008 – 9 –
IEC 60092-202:1994, Electrical installations in ships – Part 202: System design – Protection
IEC 60092-301:1980, Electrical installations in ships – Part 301: Equipment – Generators and
motors
IEC 60092-302, Electrical installations in ships – Part 302: Low-voltage switchgear and
controlgear assemblies
IEC 60092-303, Electrical installations in ships – Part 303: Equipment – Transformers for
power and lighting
IEC 60092-304, Electrical installations in ships – Part 304: Semiconductor convertors
IEC 60092-306, Electrical installations in ships – Part 306: Equipment – Luminaires and
accessories
IEC 60092-307, Electrical installations in ships – Part 307: Equipment – Heating and cooking
appliances
IEC 60092-350, Electrical installations in ships – Part 350: Shipboard power cables – General
construction and test requirements
IEC 60092-352:2005, Electrical installations in ships – Part 352: Choice and installation of
electric cables
IEC 60092-401, Electrical installations in ships – Part 401: Installation and test of completed
installation
1)
IEC 60092-502:1994 , Electrical installations in ships – Part 502: Tankers – Special features
2)
IEC 60092-504:2001 , Electrical installations in ships – Part 504: Special features – Control
and instrumentation
IEC 60309-1, Plugs, socket-outlets and couplers for industrial purposes – Part 1: General
requirements
IEC 60309-2, Plugs, socket-outlets and couplers for industrial purposes – Part 2: Dimensional
interchangeability requirements for pin and contact-tube accessories
IEC 60332-1 (all parts), Tests on electric and optical fibre cables under fire conditions – Part
1: Test for vertical flame propagation for a single insulated wire or cable
IEC 60332-3-22, Tests on electric cables under fire conditions – Part 3-22: Test for vertical
flame spread of vertically mounted bunched wires or cables – Category A
IEC 60529, Degrees of protection provided by enclosures (IP Code)
IEC 60533, Electrical and electronic installations in ships – Electromagnetic compatibility
—————————
1)
The fourth edition of IEC 60092-502 (1994) has been replaced by a new edition (IEC 60092-502:1999) which no
longer contains the data referenced in Table 1 of this document.
2)
The second edition of IEC 60092-504 (1994) has been replaced by a new edition (IEC 60092-504:2001) which
no longer contains the data referenced in Table 1 of this document.
– 10 – 60092-507 © IEC:2008
IEC 60898-1, Electrical accessories – Circuit-breakers for overcurrent protection for
household and similar installations – Part 1: Circuit-breakers for a.c. operation
IEC 60945, Maritime navigation and radiocommunication equipment and systems – General
requirements – Methods of testing and required test results
IEC 60947-7-1, Low-voltage switchgear and controlgear – Part 7-1: Ancillary equipment –
Terminal blocks for copper conductors
ISO 8846, Small craft – Electrical devices – Protection against ignition of surrounding
flammable gases
ISO 9094-1, Small craft – Fire protection – Part 1: Craft with a hull length of up to and
including 15 m
ISO 9094-2, Small craft – Fire protection – Part 2: Craft with a hull length of over 15 m
ISO 10239, Small craft – Liquefied petroleum gas (LPG) systems
International Convention for the Safety of Life at Sea (SOLAS):1974
Amendment (1983)
3 Terms and definitions
For the purposes of this document, the terms and definitions given IEC 60092-101 (some of
which are repeated here for convenience), as well as the following, apply.
3.1 General
3.1.1
safety voltage
voltage which does not exceed 50 V a.c. r.m.s. between conductors, or between any
conductor and earth, in a circuit isolated from the supply by means such as a safety isolating
transformer, or converter with separate windings;
voltage which does not exceed 50 V d.c. between conductors, or between any conductor and
earth, in a circuit which is isolated from higher voltage circuits
NOTE 1 Consideration should be given to the reduction of the limit of 50 V under certain conditions, such as wet
surroundings or exposure to heavy seas or where direct contact with live parts is involved.
NOTE 2 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.
[IEC 60092-101, definition 1.3.19]
3.1.2
essential services
services essential for the navigation, steering or maneuvering of the ship, or for the safety of
human life, or for special characteristics of the ship (for example, special services)
[IEC 60092-101, 1.3.4]
3.1.3
earthed
connected to the general mass of the hull of the ship in such a manner as will ensure at all
times an immediate discharge of electrical energy without danger
60092-507 © IEC:2008 – 11 –
NOTE 1 A conductor is said to be “solidly earthed” when it is electrically connected to the hull without a fuse-link,
switch, circuit-breaker, resistor, or impedance, in the earth connection.
NOTE 2 In the USA, “grounded” is used instead of “earthed”.
[IEC 60092-101, 1.3.9]
3.1.4
engine negative terminal
terminal on the engine to which the negative cable of a battery system is connected
3.2 DC systems of distribution
3.2.1
two-wire d.c. system
d.c. system comprising two conductors only, between which the load is connected
[IEC 60092-201, 2.2.1]
3.3 AC systems of distribution
3.3.1
single-phase two-wire a.c. system
single-phase a.c. system comprising two conductors only, between which the load is
connected
[IEC 60092-201, 2.3.1]
3.3.2
single-phase three-wire a.c. system
single-phase a.c. system comprising two conductors and a neutral wire, the supply being
taken from the two outer conductors or from the neutral wire and either outer conductor, the
neutral wire carrying only the difference-current
[IEC 60092-201, 2.3.2]
3.3.3
three-phase three-wire system
system comprising three conductors connected to a three-phase supply
[IEC 60092-201, 2.3.3]
3.3.4
three-phase four-wire system
system comprising four conductors of which three are connected to a three-phase supply and
the fourth to a neutral point in the source of supply
[IEC 60092-201, 2.3.4]
3.4 Protection
3.4.1
final circuit
that portion of a wiring system extending beyond the final overcurrent protection device for
that circuit
[IEC 60092-101, 1.3.17, modified]
– 12 – 60092-507 © IEC:2008
3.4.2
overcurrent protection device
device, such as a fuse or circuit-breaker, designed to interrupt the circuit when the current
flow exceeds a predetermined value for a predetermined time.
3.4.3
fuse
device that by the fusing of one or more of its specifically designed and proportioned
components, opens the circuit in which it is inserted by breaking the current when this
exceeds a given value for a sufficient time. The fuse comprises all the parts that form the
complete device
3.4.4
circuit-breaker
mechanical switching device capable of making, carrying and breaking currents under normal
circuit conditions, and also making, carrying for a specified time and breaking currents under
specified abnormal conditions such as those of a short circuit
3.4.5
residual (differential) current device (RCD) /ground-fault circuit interrupter (GFCI)
mechanical switching device designed to make, carry and break currents under normal
service conditions and to cause the opening of the contacts when the residual current attains
a given value under specified conditions
3.4.6
low-voltage switchgear and controlgear
combination of one or more low-voltage switching devices together with associated control,
measuring, signaling, protective, regulating equipment etc. often contained within an
enclosure or mounted on a panel
NOTE Examples of devices are circuit-breakers, fuses, switches, instruments and indicators.
3.4.7
protective conductor
conductor provided for purposes of safety, for example, protection against electric shock by
electrically connecting any of the exposed and extraneous conductive-parts of electrical
equipment of a vessel with non-metallic hull to the vessel’s main earth
NOTE In the case of a vessel with metallic hull, exposed and extraneous conductive parts may be bonded to the
ship’s hull by permanent and reliable metal to metal joints of negligible impedance.
[IEV 195-02-09, modified]
3.4.8
bond
connection of non-current-carrying parts to ensure continuity of electrical connection, or to
equalize the potential between parts comprising, for example, the armour or lead sheath of
adjacent length of cable, the bulkhead, etc. For example, bulkhead and cables in a radio-
receiving room
[IEC 60092-101, 1.3.7]
3.4.9
neutral conductor
conductor electrically connected to the neutral point and capable of contributing to the
distribution of electrical energy
[IEV 195-02-06 ]
60092-507 © IEC:2008 – 13 –
3.4.10
sheath
uniform and continuous tubular covering of metallic or non-metallic material, generally
extruded
[IEV 151-12-41, modified]
3.5 Equipment
3.5.1
cable trunking
system of enclosures comprising a base with a removable cover intended for the complete
surrounding of insulated conductors, cables or cords and for the accommodation of other
electrical equipment
[IEV 442-02-34, modified]
3.5.2
accessible (as applied to equipment)
an object or device that can be inadvertently touched or approached nearer than a safe
distance by any person. It is applied to objects not suitably guarded or insulated
[IEC 60092-101, 1.3.5]
3.5.3
captive-spade terminal
conductor terminal component which is maintained in connection to the screw or stud even
when the threaded terminal fastener is loose
3.5.4
certified safe type equipment
equipment designed and constructed to comply with IEC 60079 series
3.5.5
shore-power socket inlet
fitting designed for mounting on a vessel, of a shrouded male type, to connect to the female
connector on the vessel end of the shore-power cable, in order to make the electrical
connection for transmission of electrical energy
3.5.6
transformer
transformer with isolating separation between the input and output windings and the
protective conductor
3.5.7
generator
device which creates d.c. or a.c. (alternator) power for distribution to the electrical system on
board a vessel.
NOTE In its simplest form a generator may be an engine-driven alternator with integral rectifier for recharging a
small vessel’s extra-low voltage system. It may also be a solar panel, generator driven by wind or water mill or fuel
cell.
[IEV 411-32-01, modified]
– 14 – 60092-507 © IEC:2008
3.5.8
battery
3.5.8.1
vented cell
cell which allows products of electrolysis and evaporation to escape freely from the cells to
the atmosphere and can receive additions to the electrolyte
3.5.8.2
sealed cell
cell which remains closed and does not release or take in gas or liquid when operated within
the limits specified by the manufacturer (the cells may be equipped with a safety device to
prevent dangerously high internal pressure)
3.5.8.3
valve regulated battery
cells which are closed but have a valve which allows the escape of gas if the internal pressure
exceeds a predetermined value (the lead acid version is called the valve-regulated lead-acid
VRLA)
4 General requirements
4.1 Ratings
Conductors, switchgear and accessories shall be suitable for expected environmental and
operational conditions and shall sustain anticipated overloads and transient current induced
by motor start-up without damage, tripping or overheating.
4.2 Ambient air and cooling water temperature
Electrical equipment shall be designed to operate satisfactorily under the various temperature
parameters indicated in Table 1 (from Table 4 of IEC 60092-101).
Table 1 – Design parameters – Temperature
Parameters Unit value Type of equipment
Relevant IEC (Sub)clause
standard
High air temperature ° C
IEC 60092-201 Clause 33 45 Cables
IEC 60092-301 3.1 (Table A.1) 50 Generators and motors
IEC 60092-352 3.3.4 45 Cables
IEC 60092-502:1994 A.2.1.3, A.3.1.3, 50 Certified safe-type equipment (for use in tankers)
A.3.2.3.3
IEC 60092-504:1994 3.2 55 Control and instrumentation
Low air temperature ° C
5 General
− 25 Open deck
High water temperature ° C
IEC 60092-301 3.1 (Table A.1) 30 Generators and motors
60092-507 © IEC:2008 – 15 –
4.3 Inclination of vessel
Electrical equipment shall be designed to continue to operate satisfactorily with the vessel at
the inclinations from normal indicated in Table 2 (from Table 6 of IEC 60092-101).
NOTE For sailing vessels only, maximum heel angles of 45° on either tack should be considered.
Table 2 – Angular deviation and motion
Angular deviation about fore-and-aft axis (list)
a,b
General conditions ± 15°
Static condition
Emergency conditions ± 22° 30’
Angular deviation about athwartship axis (trim)
a
Emergency conditions ± 10°
c
Rotation about fore-and-aft axis (rolling) ± 22° 30’
Dynamic condition
c
Rotation about athwartship axis (pitching) ± 7° 30’
a
The vessel in any combination of angles within these limits.
b
For ships for the carriage in bulk of liquefied gases and dangerous chemicals, refer to the 1983 Amendment to
SOLAS 1974, Volumes II and III.
c
These motions may occur simultaneously.
4.4 Voltage and frequency variations
Equipment shall function under the normal voltage and frequency variations and harmonic
distortion which can occur in the distribution system in normal operation.
4.4.1 DC systems
The nominal d.c. voltage tolerance at the battery terminals over which all d.c. equipment shall
operate is ± 10 %.
The essential services of the vessel shall remain functional to the minimum voltage at the
battery terminals.
NOTE When battery chargers/battery combination are used as d.c. power systems, adequate measures should be
taken to keep the voltage within the specified limits during charging, quick charging and discharging of the battery.
4.4.2 AC systems
The system shall be designed to operate within the following limits:
i) frequency: ± 5 %;
+ 6
ii) voltage: %;
− 10
iii) single harmonic distortion: < 3 %;
iv) total harmonic distortion: < 5 %.
Table 3 gives recommended values of nominal voltage and frequencies as well as the
maximum voltages permitted for a vessel's service systems of supply.
– 16 – 60092-507 © IEC:2008
Table 3 – AC voltages and frequencies for vessel's service systems of supply
Recommended Recommended Maximum
nominal nominal voltage
voltages frequencies
Application
V Hz V
1 Power, cooking and heating. Equipment Single-phase Single-phase/Three- Single-phase
securely fixed and permanently connected 120/230 phase 250
50 or 60
Three-phase Three-phase
400/440 1 000
Socket-outlet supplying equipment which is Single-phase Single-phase Single-phase
earthed 120/230 50 or 60 500
2 Fixed lighting and outlets intended for purposes Single-phase Single-phase Single-phase
not mentioned in items 1 and 3 but intended for 120/230 50 or 60 250
apparatus with reinforced or double insulation
or connected by a flexible cord or cable
incorporating a protective conductor
3 Socket-outlets for use where extra precautions
against shock are necessary:
a) supplies with or without the use of isolating Single-phase Single-phase Single-phase
transformers 24 50 or 60 55
b) where a safety isolating transformer is used 120/230 50 or 60 250
supplying one consuming device only. Both
conductors of such systems should be
insulated from earth
NOTE The use of the nominal voltages as given in IEC 60092-201 is permitted.
4.5 Electrical power sources
The vessel’s electrical power may be supplied by a generator(s) and/or main battery bank
having sufficient capacity to supply the essential services.
4.5.1 DC systems supplied from batteries
A vessel in which the only means of propulsion is an internal combustion engine with electric
starting shall be provided with two batteries or group of batteries, each one of sufficient
capacity to start the engine.
One battery or battery group shall be reserved for engine starting service, the other for
supplying the vessel’s electrical services. It shall be possible to select which battery or group
is used for which service and also to connect both battery groups in parallel in an emergency
to assist engine starting. Special charge splitting arrangements may also be fitted if required
to enable two or more batteries to be re-charged by a single generator.
Each main battery bank shall be capable of being isolated from the d.c. system which is
supplied, normally by a switch in the positive conductor from each battery or group of
batteries. The isolator switch function may be combined with the service selection function
above. The battery selector switch or control shall be fitted in a readily accessible location, as
close as practical to the battery or group of batteries.
Isolation switches shall not be placed in battery compartments or containers. Remote-
controlled isolation switches, if used, shall also permit safe manual operation.
The following systems, however, may be connected between the isolation switch and the
battery:
60092-507 © IEC:2008 – 17 –
a) electronic devices with protected memory and protective devices such as bilge-pumps and
alarms, if individually protected by a circuit-breaker or fuse as close as practical to the
battery terminal;
b) ventilation exhaust blower of engine/fuel-tank compartment if separately protected by a
fuse or circuit-breaker as close as practical to the battery terminal;
c) charging devices which are intended to be used when the vessel is unattended (for
example, solar panels, wind generators) if individually protected by a fuse or circuit-
breaker as close as practical to the battery terminal.
The minimum continuous rating of the battery selection/isola
...
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