SIST EN 60092-507:2015

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Installations électriques à bord des navires -- Partie 507: Petits naviresElectrical installations in ships -- Part 507 - Small vessels47.080ýROQLSmall craft47.020.60Electrical equipment of ships and of marine structuresICS:Ta slovenski standard je istoveten z:EN 60092-507:2015SIST EN 60092-507:2015en01-junij-2015SIST EN 60092-507:2015SLOVENSKI
STANDARDSIST EN 60092-507:20011DGRPHãþD

EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 60092-507
January 2015 ICS 47.020.60
Supersedes
EN 60092-507:2000
English Version
Electrical installations in ships - Part 507 - Small vessels (IEC 60092-507:2014)
Installations électriques à bord des navires - Partie 507: Petits navires (IEC 60092-507:2014)
Elektrische Anlagen auf Schiffen - Teil 507: Kleine Wasserfahrzeuge (IEC 60092-507:2014) This European Standard was approved by CENELEC on 2014-12-30. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung CEN-CENELEC Management Centre: Avenue Marnix 17,
B-1000 Brussels © 2015 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 60092-507:2015 E SIST EN 60092-507:2015

This document supersedes EN 60092-507:2000. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such patent rights. Endorsement notice The text of the International Standard IEC 60092-507:2014 was approved by CENELEC as a European Standard without any modification. In the official version, for Bibliography, the following notes have to be added for the standards indicated: ISO 10133 NOTE Harmonised as EN ISO 10133 (not modified). ISO 10240 NOTE Harmonised as EN ISO 10240 (not modified). ISO 13297 NOTE Harmonised as EN ISO 13297 (not modified).
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Normative references to international publications with their corresponding European publications 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. NOTE 1 When an International Publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies. NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available here: www.cenelec.eu. Publication Year Title EN/HD Year IEC 60034
series Rotating electrical machines EN 60034
series IEC 60079
series Explosive atmospheres EN 60079
series IEC 60092-101 1994
Electrical installations in ships - Part 101: Definitions and general requirements - -
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: Equipment - 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 -
Electrical installations in ships - Part 352: Choice and installation of electrical cables - -
IEC 60092-401 1980
Electrical installations in ships.- Part 401: Installation and test of completed installation - -
IEC 60092-501 2013
Electrical installations in ships - Part 501: Special features - Electric propulsion plant - -
IEC 60146
series General requirements and line commutated convertors EN 60146
series IEC 60245-4 -
Rubber insulated cables - Rated voltages up to and including 450/750 V - Part 4: Cords and flexible cables - -
Plugs, socket-outlets and couplers for industrial purposes - Part 1: General requirements EN 60309-1 -
IEC 60309-2 -
Plugs, socket-outlets and couplers for industrial purposes - Part 2: Dimensional interchangeability requirements for pin and contact-tube accessories EN 60309-2 -
IEC 60332-1
series Tests on electric cables under fire conditions; Part 1: test on a single vertical insulated wire or cable EN 60332-1
series IEC 60332-3-22 -
Tests on electric and optical fibre cables under fire conditions - Part 3-22: Test for vertical flame spread of vertically-mounted bunched wires or cables - Category A - -
IEC 60364-7-709 -
Low-voltage electrical installations - Part 7-709: Requirements for special installations or locations - Marinas and similar locations HD 60364-7-709 -
IEC 60445 2010
Basic and safety principles for man-machine interface, marking and identification - Identification of equipment terminals, conductor terminations and conductors EN 60445 2010
IEC 60529 -
Degrees of protection provided by enclosures (IP Code) EN 60529 -
IEC 60533 -
Electrical and electronic installations in ships - Electromagnetic compatibility - -
IEC 60898-1 -
Electrical accessories - Circuit-breakers for overcurrent protection for household and similar installations - Part 1: Circuit-breakers for a.c. operation EN 60898-1 -
IEC 60945 -
Maritime navigation and radiocommunication equipment and systems - General requirements - Methods of testing and required test results EN 60945 -
IEC 60947-2 -
Low voltage switchgear and controlgear – Part 2: Circuit-breakers EN 60947-2 -
IEC 60947-7-1 -
Low-voltage switchgear and controlgear - Part 7-1: Ancillary equipment - Terminal blocks for copper conductors EN 60947-7-1 -
IEC 61140 -
Protection against electric shock - Common aspects for installation and equipment EN 61140 -
IEC 61558
series Safety of power transformers, power supplies, reactors and similar products EN 61558
series IEC 61558-2-4 2009
Safety of transformers, reactors, power supply units and similar products for supply voltages up to 1 100 V - Part 2-4: Particular requirements and tests for isolating transformers and power supply units incorporating isolating transformers EN 61558-2-4 2009
ISO 8846 -
Small craft - Electrical devices - Protection against ignition of surrounding flammable gases EN 28846:1993/A1 -
ISO 9094-1 -
Small craft - Fire protection - Part 1: Craft with a hull length of up to and including 15 m EN ISO 9094-1 -
ISO 9094-2 -
Small craft - Fire protection - Part 2: Craft with a hull length of over 15 m EN ISO 9094-2 -
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Small craft - Liquefied petroleum gas (LPG) systems EN ISO 10239 -
IMO 904E -
Convention on the International Regulations for Preventing Collisions at Sea, International Maritime Organization (COLREG) - -
SOLAS 1974
International Convention for the Safety of Life at Sea - -
IEC 60092-507 Edition 3.0 2014-11 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 INTERNATIONALE XB ICS 47.020.60 PRICE CODE CODE PRIX ISBN 978-2-8322-1933-1
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CONTENTS FOREWORD . 7 INTRODUCTION . 9 1 Scope . 10 1.1 General . 10 1.2 Electrical systems . 10 2 Normative references . 11 3 Terms and definitions . 13 3.1 General terms . 13 3.2 Terms and definitions related to DC systems of distribution . 14 3.3 Terms and definitions related to AC systems of distribution. 14 3.4 Terms and definitions related to protection. 15 3.5 Terms and definitions related to equipment . 16 3.6 Terms and definitions related to batteries . 18 3.7 Terms and definitions related to galvanic isolation from shore supplies . 19 4 General requirements . 19 4.1 Ratings . 19 4.2 Ambient air and cooling water temperature . 19 4.3 Inclination of vessel . 20 4.4 Voltage and frequency variations . 20
General . 20 4.4.1 DC systems . 20 4.4.2 AC systems . 21 4.4.34.5 Electrical power sources . 21
General . 21 4.5.1 DC systems supplied from batteries . 22 4.5.2 DC generator . 22 4.5.3 AC systems . 23 4.5.4 AC generator . 23 4.5.5 Measuring instruments. 24 4.5.6 Emergency source of electrical power . 24 4.5.74.6 Equipment . 25
Transformers . 25 4.6.1 Converters . 25 4.6.2 Motors . 25 4.6.34.7 Electrical equipment and enclosures . 25
General requirements . 25 4.7.1 General degree of protection of equipment and enclosures . 25 4.7.2 Protection from dripping water . 26 4.7.3 Cable entry . 26 4.7.4 Identification . 26 4.7.5 Segregation of DC and AC systems . 27 4.7.6 Electromagnetic compatibility . 27 4.7.7 Busbars . 27 4.7.8 Switches and controls . 27 4.7.9 Final circuits . 27 4.7.104.8 Plugs and socket-outlets . 28 SIST EN 60092-507:2015

IEC 60092-507:2014 © IEC 2014 – 3 –
AC system . 28 4.8.1 DC systems . 28 4.8.2 Installation in special locations . 28 4.8.34.9 Battery installation . 28
General arrangements . 28 4.9.1 Isolation of battery banks . 28 4.9.2 Operational switching of battery banks . 29 4.9.3 Permanently energised circuits . 29 4.9.4 Ventilation . 29 4.9.54.10 Electrical apparatus for explosive gas atmospheres . 30 4.11 Battery chargers . 30
Protection against overcharging and reversal of charging current . 30 4.11.1 Wind generator and photovoltaic devices . 31 4.11.24.12 Electric propulsion systems . 31
General . 31 4.12.1 Component parts of electric propulsion systems suitable for small 4.12.2vessels. . 31
Operator controls, instruments, system and trip alarms . 33 4.12.34.13 Electrical fittings and cables attached to structures of another metal . 34 4.14 Internal communication circuits . 34 4.15 Navigation lights supply . 34 4.16 Luminaires . 34 4.17 Electrical heating and cooking appliances . 35 4.18 Magnetic compasses . 35 5 Distribution systems . 35 5.1 DC distribution systems . 35 5.2 Standard AC distribution systems . 35
Types of AC distribution system . 35 5.2.1 Earthing the neutral conductor in type TN AC systems . 35 5.2.2 Earthing of non-current-carrying parts. 36 5.2.3 Protective conductor in AC systems . 36 5.2.45.3 Earth bonding conductors . 36 5.4 Balance of loads in three-phase AC systems . 36 5.5 Shore connection arrangements . 37
General . 37 5.5.1 Vessel connections . 37 5.5.2 Information and connection instructions . 37 5.5.3 Galvanic isolation provided by an isolation transformer . 37 5.5.4 Galvanic isolation provided by a diode type galvanic isolator . 38 5.5.56 Protection against electric shock in AC and DC systems with voltage exceeding safety voltage . 39 6.1 Protection against direct contact . 39 6.2 Automatic disconnection of supply to final circuit or equipment . 39 6.3 Earthed neutral AC system (TN system). 39 6.4 Non-neutral earthed AC system (IT-type system) . 39 6.5 Use of class II equipment . 40 7 Protection against over-current and fault-current in AC and DC systems . 40 7.1 General . 40 7.2 Characteristics of protective devices . 40 SIST EN 60092-507:2015

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7.3 DC battery source . 40
Overcurrent protection of main circuit from batteries . 40 7.3.1 Batteries without output overcurrent protection . 41 7.3.27.4 AC system . 41
Protective devices . 41 7.4.1 Final circuits . 41 7.4.27.5 Generators . 42
Small generators in DC systems . 42 7.5.1 Use of fuses . 42 7.5.2 Generator circuit-breaker . 42 7.5.37.6 Transformers . 42 7.7 Motor protection . 42 7.8 Electronic power converters . 42 8 Diversity (demand) factor . 42 8.1 Circuits other than final circuits . 42 8.2 Application of diversity (demand) factors . 43 8.3 Final circuits . 43 8.4 Motor power circuits . 43 9 Cables . 43 9.1 Selection of cables . 43
Cables for DC systems . 43 9.1.1 Cables for AC systems . 43 9.1.2 Conductors . 43 9.1.3 Protective coverings . 43 9.1.49.2 Determination of the cross-sectional areas of conductors . 44
General requirement . 44 9.2.1 DC system . 44 9.2.2 AC system . 44 9.2.3 Protective conductor in AC systems . 44 9.2.4 Current ratings for continuous service (AC and DC) . 45 9.2.5 Correction factors for different ambient air temperatures . 46 9.2.6 Correction factors for cable bunching. 47 9.2.7 Correction factors for non-continuous service . 47 9.2.8 Parallel connection of cables . 47 9.2.910 Cable installation, conductor terminations and identification . 48 10.1 Cable routes . 48 10.2 Cable support and protection . 48 10.3 Segregation of circuits . 48 10.4 DC and AC cabling segregation . 49 10.5 Instrument, control, navigation aids, data, and communications cables . 49 10.6 Conductor terminations . 50 10.7 Conductor identification . 50
General . 50 10.7.1 Bonding conductors . 51 10.7.2 Conductor insulation colours in DC systems . 51 10.7.311 Earthing . 51 11.1 Earthing arrangements on small vessels with non-metallic hull . 51 11.2 Earthing arrangements on small vessels with metallic hull . 51 SIST EN 60092-507:2015

IEC 60092-507:2014 © IEC 2014 – 5 –
11.3 Earthing plate for the main earth connection in a small vessel with non-metallic hull . 51 11.4 Insulation from earth of control systems for internal combustion engine on metallic hulled vessels . 51 11.5 Earthing of electrical equipment enclosures . 52 12 Lightning protection . 52 12.1 Lightning protection conductors . 52 12.2 Installation . 52 12.3 Earthing of lightning conductors . 52 13 Testing . 52 13.1 General . 52 13.2 Earthing . 53 13.3 Insulation resistance . 53
General . 53 13.3.1 Switchboards, panel boards and distribution boards . 53 13.3.2 Lighting and power circuits . 53 13.3.3 Generators and motors . 53 13.3.4 Transformers . 53 13.3.513.4 Switchgear and controlgear . 54 13.5 Voltage drop . 54 13.6 Internal communication circuits . 54 13.7 Lighting, heating and galley equipment . 54 14 Vessels over 24 m in length up to 50 m/500 GT . 54 14.1 General . 54 14.2 Essential services . 54 14.3 Capacity of the batteries . 54 14.4 Segregation of supplies for essential circuits . 55 14.5 SOLAS battery charger protection . 55 14.6 Protection against over current and fault current – safety equipment . 55 14.7 Earth faults in essential circuits . 55
Earthed neutral systems (TN-type systems) . 55 14.7.1 Non-earthed system (IT-type system) . 55 14.7.214.8 Navigation light supply . 55 14.9 Radio and navigation equipment . 55 14.10 Navigation, control, instrumentation and communication systems . 56 14.11 Electric and electrohydraulic steering gear . 56 Annex A (informative)
Shore-side power supply arrangements . 57 A.1 Connection to a shore power supply . 57 A.1.1 General . 57 A.1.2 Instructions included in a vessel owner's manual (ISO 10240) . 57 A.1.3 Information and instructions for connecting an electrical shore supply to a vessel . 57 A.2 Examples of general arrangements for an electrical supply to a vessel . 58 A.2.1 Direct connection to a single phase mains supply . 58 A.2.2 Direct connection to a single phase mains supply with an isolating transformer on the vessel . 59 A.2.3 Direct connection to a three phase mains supply . 59 A.2.4 Direct connection to a three phase mains supply with an isolating transformer on the vessel . 60 SIST EN 60092-507:2015

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A.2.5 Connection to a single phase supply through a shore-mounted isolating transformer . 61 A.2.6 Direct connection to a single phase mains supply with a diode type galvanic isolator in the PE circuit to shore. . 61 A.2.7 Direct connection to a three phase mains supply with a diode type galvanic isolator in the PE circuit to shore. . 62 Annex B (informative)
Diode type galvanic isolator . 63 B.1 General . 63 B.2 Testing . 64 Annex ZZ (informative)
Relationship between this standard and the essential requirements of EU directive 94/25/EC as amended by directive 2003/44/EC . 65 Bibliography . 66
Figure 1 – Diagram showing the use of shore power supply accessories . 18 Figure A.1 – Direct connection to a single phase mains supply . 59 Figure A.2 – Direct connection to a single phase mains
supply with an isolating transformer on the vessel . 59 Figure A.3 – Direct connection to a three phase mains supply . 60 Figure A.4 – Direct connection to a three phase mains
supply with an isolating transformer on the vessel . 60 Figure A.5 – Connection to a single phase supply
through a shore-mounted isolating transformer . 61 Figure A.6 – Direct connection to a single phase mains supply with a diode type galvanic isolator in the protective earth circuit to shore . 62 Figure A.7 – Direct connection to a three phase mains supply with
a diode type galvanic isolator in the protective earth circuit to shore . 62
Table 1 – Design parameters – Temperature . 20 Table 2 – Angular deviation and motion . 20 Table 3 – AC voltages and frequencies for vessel's service systems of supply . 21 Table 4 – Required technical data for owner’s manual . 22 Table 5 – Degree of protection in accordance with IEC 60529. 26 Table 6 – Minimum clearances and creepage distances for bare busbars . 27 Table 7 – Reference currents for calculation of minimum ventilation . 30 Table 8 – Table of main component parts of an electric propulsion system and associated clauses and sections in this standard . 32 Table 9 – Recommended maximum breaking times for protective devices . 41 Table 10 – Values of α used in the calculation of current ratings . 45 Table 11 – Recommended current ratings for single core cables
in continuous service (ambient temperature 45 °C) . 46 Table 12 – Correction factors for various ambient air temperatures . 47 Table 13 – Correction factors for half-hour and one-hour service . 47 Table ZZ.1 – Correspondence between this standard and directive 94/25/EC as amended by directive 2003/44/EC . 65
IEC 60092-507:2014 © IEC 2014 – 7 –
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 this end and in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work. International, governmental and non-governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with conditions determined by agreement between the two organizations. 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committee has representation from all interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any misinterpretation by any end user. 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications transparently to the maximum extent possible in their national and regional publications. Any divergence between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter. 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any services carried out by independent certification bodies. 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 members of its technical committees and IEC National Committees for any personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and 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 60092-507 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 2008 and constitutes a technical revision.
This third edition includes the following significant technical changes with respect to the previous edition. a) The standard now clarifies its application for electrical installations in those recreational craft which require to conform to the Recreational Craft Directive. b) The standard specifies requirements for methods of galvanic isolation for small vessels and recreational craft connecting to a low voltage AC shore supply.
c) The standard includes design guidance for electric propulsion systems suitable for small vessels and associated installation requirements.
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The text of this standard is based on the following documents: FDIS Report on voting 18/1426/FDIS 18/1443/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 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.
IEC 60092-507:2014 © IEC 2014 – 9 –
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.
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ELECTRICAL INSTALLATIONS IN SHIPS –
Part 507: Small vessels
1 Scope 1.1 General 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 tonnage not exceeding 500 Gross Tonnes (GT), designed for use on inland waters or at sea. It is not intended to apply to:
a) small craft equipped only with a battery supplying circuits for engine starting and navigation lighting recharged from an inboard or outboard engine driven alternator. b) recreational craft of less than 24 m hull length requiring to conform to the Recreational Craft Directive 94/25/EC Annex 1 Essential Requirements Part 5.3 Electrical systems, except for three-phase alternating current installations in such recreational craft which operate at a nominal voltage not exceeding AC 500 V. 1.2 Electrical systems This standard applies to the types of DC and AC electrical systems described below, individually or in combination. a) Direct current system which operates at a nominal voltage not exceeding DC 50 V. For many small vessels, this will be the main electrical system supported by batteries for engine starting, navigation lights, navigational aids and communications equipment, lighting and other DC power consumer or converter equipment.
b) Single-phase alternating current system which operates at a nominal voltage not exceeding AC 250 V. 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 AC system. A vessel may also be equipped with DC system(s) for equipment supplied from batteries as in 1.2 a) above. c) Three-phase alternating current system which operates at a nominal voltage not exceeding AC 500 V. 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 AC circuits(s) similar to 1.2 b) above and DC system(s) for equipment supplied from batteries as in 1.2 a) above. NOTE 1 Concerning recreational craft of less than 24 m hull length referenced in 1.1 b) above, the following standards apply: – for direct current installations which operate at a nominal voltage not exceeding DC 50 V: ISO 10133; – for single-phase alternating current installations which operate at a nominal voltage not exceeding AC 250 V single phase: ISO 13297. NOTE 2 For alternating current systems having voltages exceeding AC 250 V single-phase or AC 500 V three-phase, for direct current systems exceeding DC 50 V, and for vessels larger than 500 GT or with a length greater than 50 m, other standards within the IEC 60092 series apply. NOTE 3 Attention is drawn to regulations which govern specific requirements for navigation lights for s
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