SIST EN ISO 13297:2021

SLOVENSKI STANDARD
01-junij-2021
Nadomešča:
SIST EN ISO 10133:2017
SIST EN ISO 13297:2018
Mala plovila - Električni sistemi - Inštalacije za izmenični in enosmerni tok (ISO
13297:2020)
Small craft - Electrical systems - Alternating and direct current installations (ISO
13297:2020)
Kleine Wasserfahrzeuge - Elektrische Systeme - Wechselstrom- und
Gleichstromanlagen (ISO 13297:2020)
Petits navires - Installations électriques - Installations à courant alternatif continu (ISO
13297:2020)
Ta slovenski standard je istoveten z: EN ISO 13297:2021
ICS:
47.020.60 Električna oprema ladij in Electrical equipment of ships
konstrukcij na morju and of marine structures
47.080 Čolni Small craft
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 13297
EUROPEAN STANDARD
NORME EUROPÉENNE
April 2021
EUROPÄISCHE NORM
ICS 47.080 Supersedes EN ISO 10133:2017, EN ISO 13297:2018
English Version
Small craft - Electrical systems - Alternating and direct
current installations (ISO 13297:2020)
Petits navires - Installations électriques - Installations Kleine Wasserfahrzeuge - Elektrische Systeme -
à courant alternatif et continu (ISO 13297:2020) Wechselstrom- und Gleichstromanlagen (ISO
13297:2020)
This European Standard was approved by CEN on 6 July 2020.

CEN 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 CEN
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 CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 13297:2021 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
Annex ZA (informative) Relationship between this European Standard and the Essential
Requirements of Directive 2013/53/EU aimed to be covered . 4

European foreword
This document (EN ISO 13297:2021) has been prepared by Technical Committee ISO/TC 188 "Small
craft" in collaboration with CCMC.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by October 2021, and conflicting national standards shall
be withdrawn at the latest by October 2021.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 10133:2017 and EN ISO 13297:2018.
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association, and supports essential requirements of EU Directive(s).
For the relationship with EU Directive(s) see informative Annex ZA, which is an integral part of this
document.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the
United Kingdom.
Endorsement notice
The text of ISO 13297:2020 has been approved by CEN as EN ISO 13297:2021 without any modification.

Annex ZA
(informative)
Relationship between this European Standard and the Essential
Requirements of Directive 2013/53/EU aimed to be covered
This European Standard has been prepared under a Commission’s standardization request
M/542 C(2015) 8736 final to provide one voluntary means of conforming to Essential Requirements of
Directive 2013/53/EU.
Once this standard is cited in the Official Journal of the European Union under that Directive,
compliance with the normative clauses of this standard given in Table ZA.1 confers, within the limits of
the scope of this standard, a presumption of conformity with the corresponding Essential Requirements
of that Directive and associated EFTA regulations.
Table ZA.1 — Correspondence between this European Standard and Directive 2013/53/EU
Essential Requirements of Clause(s)/sub-clause(s) of
Remarks/Notes
Directive 2013/53/EU this EN
Annex I, Part A, 5.3 - All clauses except Clause 26, This standard does not deal with
Electrical systems Annex A battery ventilation to prevent the
accumulation of explosive gases
or electric propulsion circuits.
Annex I, Part A, 5.6.1 - Fire Clause 20.6 In respect of routing electrical
protection; general conductors away from exhaust
components and heat sources.
Annex I, Part A, 2.5 - Owner’s Clause 26, Annex B Annex B specifies the information
manual to be included in the owner’s
manual, it does specify the
requirements for the owner’s
manual
WARNING 1 — Presumption of conformity stays valid only as long as a reference to this European
Standard is maintained in the list published in the Official Journal of the European Union. Users of this
standard should consult frequently the latest list published in the Official Journal of the European
Union.
WARNING 2 — Other Union legislation may be applicable to the product(s) falling within the scope of
this standard.
INTERNATIONAL ISO
STANDARD 13297
Fifth edition
2020-12
Small craft — Electrical systems
— Alternating and direct current
installations
Petits navires — Installations électriques — Installations à courant
alternatif et continu
Reference number
ISO 13297:2020(E)
©
ISO 2020
ISO 13297:2020(E)
© ISO 2020
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved

ISO 13297:2020(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 General requirements, DC and AC systems . 5
5 General requirements, DC systems . 6
6 General requirements, AC systems . 7
7 Marking, AC systems . 8
8 Batteries, DC systems . 9
9 Battery-disconnect switch, DC systems .11
10 Power source options, AC systems .11
11 Inverters and inverter/chargers, AC systems .12
12 Overcurrent protection, DC systems .13
13 Overcurrent protection, AC systems .14
13.1 General .14
13.2 Supply circuits .14
13.3 Branch circuits .14
14 Ground-fault protection/earth-leakage protection, AC systems .15
15 Panel boards (switchboards), DC and AC systems .15
16 Panel boards (switchboards), AC systems .15
17 Conductors, DC and AC systems .15
18 Conductors, DC systems .16
19 Conductors, AC systems .16
20 System wiring, DC and AC systems .17
21 System wiring, DC systems .19
22 Socket outlets, DC systems .19
23 Socket outlets, AC systems .19
24 Appliances and equipment, AC systems .19
25 Ignition protection, DC and AC systems .19
26 Owner’s manual.20
Annex A (normative) Conductor requirements .21
Annex B (normative) Instructions to be included with owner's manual .23
Annex C (informative) Recommended system tests .24
Annex D (informative) Typical AC system diagrams .25
Annex E (informative) Overcurrent protection location options.32
Bibliography .34
ISO 13297:2020(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/ patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to
the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see
www .iso .org/ iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 188, Small craft, in collaboration with
the European Committee for Standardization (CEN) Technical Committee CEN/TC 464, Small craft, in
accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
This fifth edition of ISO 13297 cancels and replaces ISO 13297:2014 and ISO 10133:2012, which have
been technically revised.
The main changes compared to the previous editions are as follows:
— combined the standard for alternating current (ISO 13297:2014) and the standard for direct current
(ISO 10133:2012) into a single marine electrical standard.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/ members .html.
iv © ISO 2020 – All rights reserved

INTERNATIONAL STANDARD ISO 13297:2020(E)
Small craft — Electrical systems — Alternating and direct
current installations
IMPORTANT — The colours represented in the electronic file of this document can be neither
viewed on screen nor printed as true representations. For the purposes of colour matching,
see ISO 3864-4, which provides colorimetric and photometric properties together with, as a
guideline, references from colour order systems.
1 Scope
This document specifies the requirements for the design, construction and installation of the following
types of DC and AC electrical systems, installed on small craft either individually or in combination:
a) extra-low-voltage direct current (DC) electrical systems that operate at nominal potentials of
50 V DC or less;
b) single-phase alternating current (AC) systems that operate at a nominal voltage not exceeding
AC 250 V.
This document does not cover the following:
— electrical propulsion systems of direct current less than 1 500 V DC, single-phase alternating
current up to 1 000 V AC, and three-phase alternating current up to 1 000 V AC, which are addressed
by ISO 16315;
— any conductor that is part of an outboard engine assembly and that does not extend beyond the
outboard engine manufacturers supplied cowling;
— three-phase AC installations that operate at a nominal voltage not exceeding 500 V AC, which are
addressed by IEC 60092-507.
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.
ISO 7010:2019, Graphical symbols — Safety colours and safety signs — Registered safety signs
ISO 8846:1990, Small craft — Electrical devices — Protection against ignition of surrounding
flammable gases
ISO 10240:2019, Small craft — Owner’s manual
IEC 60309-2:1999, Plugs, socket-outlets and couplers for industrial purposes — Part 2: Dimensional
interchangeability requirements for pin and contact-tube accessories
IEC 60529:1989, Degrees of protection provided by enclosures (IP code)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
ISO 13297:2020(E)
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
craft’s ground/earth
protective grounding
connection, provided for safety purposes, that is established by a conducting connection with the
common ground/earth (potential of the earth's surface)
3.2
equipotential bonding conductor
normally non-current-carrying conductor used to put various exposed conductive parts (3.15) of direct
current electrical devices and extraneous conductive parts (3.33) at a substantially equal potential
3.3
engine negative terminal
terminal on the engine, starter or solenoid to which the negative battery cable is connected
3.4
main grounding
earthing point
main point that provides connection for the DC negative conductor, AC protective grounding conductor
(3.10) and bonding conductor to the craft's ground that is established by a conducting connection
(intended or accidental) with the common ground (potential of the earth's surface)
Note 1 to entry: It can include any conductive part of the wetted surface of the hull in permanent contact with the
water, depending on the overall system design.
3.5
overcurrent protection device
device designed to interrupt the circuit when the current flow exceeds a predetermined value for a
predetermined time
EXAMPLE A fuse (3.29) or circuit breaker.
3.6
residual current device
RCD
electro-mechanical switching device or association of devices designed to make, carry and break
currents under normal service conditions and to cause the opening of contacts when the residual
current attains a given value under specified conditions
Note 1 to entry: RCDs serve to reduce the risk of injury to people from electrical shock hazard, and damage to
equipment from leakage of stray currents to earth or to other circuits.
3.7
polarization transformer
transformer that automatically orientates the neutral and active (phase) conductors (3.12) in the system
in the same polarity orientation as the polarized system (3.17) of the craft
3.8
isolation transformer
transformer installed in the shore power supply circuit on a craft to electrically isolate all the normally
live conductors (3.11) and the protective conductor (3.10) on the craft from the AC system conductors of
the shore power supply
3.9
neutral conductor
conductor intentionally maintained at ground potential and capable of contributing to the transmission
of electrical energy
2 © ISO 2020 – All rights reserved

ISO 13297:2020(E)
3.10
protective conductor
protective grounding conductor
conductor, not normally carrying current, used for some measure of protection against electric shock,
for electrically connecting any of the following parts of electrical equipment to the craft's ground/earth
and to the shore AC grounding conductor through the shore power cable:
a) exposed conductive parts (3.15) of electrical equipment;
b) extraneous conductive parts (3.33);
c) the main grounding (earthing) terminal;
d) earth electrode(s);
e) the earth point of a source, or an artificial neutral
3.11
live conductor
conductor or conductive part intended to be energized in normal use, including a neutral conductor (3.9)
3.12
active (phase) conductor
conductor that is maintained at a difference of potential from the neutral conductor (3.9) or protective
conductor (3.10)
Note 1 to entry: In a system that does not include a neutral or protective conductor, all conductors are considered
active conductors.
3.13
ignition-protected
designed and constructed to give protection against ignition of surrounding
flammable gases
Note 1 to entry: The protection against ignition of surrounding flammable gases is covered in ISO 8846:1990.
3.14
system voltage
nominal voltage supplied to the craft from a power source
3.15
exposed conductive part
conductive part of electrical equipment, which can be touched and which is not normally live, but which
can become live under fault conditions
3.16
panel board
switchboard
assembly of devices for the purpose of controlling and/or distributing electrical power
Note 1 to entry: It can include devices such as circuit breakers, fuses (3.29), switches, instruments, and indicators.
3.17
polarized system
system in which the live conductors (3.11) (active and neutral) are connected in the same relation to all
terminals on devices or receptacles (socket outlets) in a circuit
ISO 13297:2020(E)
3.18
fully insulated two-wire DC system
system in which both positive and negative poles remain isolated from the ground (earth), e.g. not
connected to the water through a metallic hull, the propulsion system or earthed through the AC
protective conductor (3.10)
Note 1 to entry: Some systems can use a momentary ground connection for engine starting purposes and can
remain isolated.
3.19
self-limiting
device whose maximum output is restricted to a specified value by its magnetic or electrical
characteristics
3.20
two-wire DC system with negative ground
system in which the DC negative is connected to the ground
3.21
shore power appliance inlet
fitting designed for mounting on a craft, of a shrouded male type, to connect to the female connector
on the craft end of the shore power cable in order to make the electrical connection for transmission of
electrical energy
3.22
trip-free 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 circuit conditions such as those of overload or short circuit, and which is designed so that the
resetting means cannot be manually held in place to override the current-interrupting mechanism
3.23
accessible
capable of being reached for inspection, removal or maintenance without removal of permanent craft
structure
3.24
readily accessible
capable of being reached for use, inspection, removal or maintenance without the use of tools
3.25
sheath
uniform and continuous tubular protective covering of metallic or non-metallic material around one or
more insulated conductors
Note 1 to entry: Examples of appropriate materials include moulded rubber, moulded plastic, woven sleeving or
flexible tubing.
3.26
conduit
part of a closed wiring system of circular or non-circular cross-section for insulated conductors and/or
cables in electrical installations, allowing them to be drawn in and/or replaced
3.27
cable trunking
system of closed enclosures comprising a base with a removable cover intended for the complete
surrounding of insulated conductors, cables, cords and for the accommodation of other electrical
equipment
4 © ISO 2020 – All rights reserved

ISO 13297:2020(E)
3.28
double-pole circuit breaker
device intended to interrupt both the neutral conductor (3.9) and active (phase) conductors (3.12) in a
circuit simultaneously when a designated current is exceeded for a predetermined time
3.29
fuse
protective device that interrupts the circuit irreversibly when the current flow reaches a specified
value for a specific time
[SOURCE: ISO 8820-1:2014, 3.2, modified – Note 1 to entry has been deleted.]
3.30
galvanic isolator
device which can be installed in series with the AC protective conductor (3.10) of the shore power cable
to block low voltage DC galvanic current flow, but permits the passage of AC normally associated with
the protective conductor
3.31
inverter
device powered by a DC source, designed primarily to provide AC power at a required voltage and
frequency
3.32
inverter/charger
device designed to supply either AC power to a craft’s electrical system or to utilize the craft’s AC
electrical distribution system to charge or maintain a battery or batteries supplying DC
3.33
extraneous conductive part
conductive part liable to introduce a potential, generally ground/earth potential, and not forming part
of the electrical installation
3.34
ground plate
means to conduct the electrical current from a craft's conductive element to the water
3.35
craft
small craft
recreational boat, and other watercraft using similar equipment, of up to 24 m length of hull (L )
H
Note 1 to entry: The measurement methodology for the length of hull is defined in ISO 8666.
[SOURCE: ISO 8666:2020, 3.15, modified – Note 1 to entry has been added.]
4 General requirements, DC and AC systems
4.1 The hull of a metallic hull craft shall not be used as a circuit conductor.
4.2 Craft equipped with both DC and AC electrical systems shall have their distribution from either
separate panel boards, or from a common one with a partition, or from other positive means to separate
clearly the AC and DC sections from each other, and these shall be clearly identified.
4.3 Wiring diagrams to identify circuits, components and conductors shall be included with the craft.
After completing an AC installation, it is recommended to perform a system test according to Annex C.
ISO 13297:2020(E)
4.4 Switches and controls shall be marked to indicate their function, unless the purpose of the switch
is obvious and its operation cannot, under normal operating conditions, cause a hazardous condition.
5 General requirements, DC systems
5.1 The system type shall be either a fully insulated two-wire DC system or a two-wire DC system with
negative ground. Engine-mounted wiring systems can use the engine block as the grounded conductor.
For DC systems with a negative ground, the main grounding/earthing point shall be either:
a) the engine negative terminal; or
b) a main grounding bus of sufficient current carrying capacity.
Systems with multiple battery banks shall have a common negative connection. Exceptions to this
are for dedicated power systems isolated from craft systems, e.g. propulsion systems that are clearly
identified as part of the isolated system.
5.2 An equipotential bonding conductor, if fitted, shall be connected to the craft's main grounding/
earthing point.
5.3 Protective devices such as trip free circuit breakers or fuses shall be provided at the source of
power, e.g. the panel board (switchboard), to interrupt any overload current in the circuit conductors
before heat can damage conductor insulation, connections or wiring system terminals.
5.3.1 The selection, arrangement and performance characteristics shall allow:
a) maximum continuity of service to healthy circuits when fault conditions exist in other circuits,
through selective operation of the various protective devices; and
b) protection of electrical equipment and circuits from damage due to overcurrents, by coordination
of the electrical characteristics of the circuit or apparatus and the tripping characteristics of the
protective devices.
5.4 All DC equipment shall be capable of function within a voltage range of 75 % to 133 % of nominal
voltage at the battery terminals, e.g.:
— for a 12 V system: 9 V to 16 V;
— for a 24 V system: 18 V to 32 V;
— for a 48 V system: 36 V to 64 V.
EXCEPTION  Where the circuit includes equipment requiring a higher minimum voltage, the specified
minimum voltage shall be used in the calculation of the conductor size in accordance with Annex A.
5.5 The length and cross sectional area of conductors in each circuit shall be such that the calculated
voltage drop shall not exceed 10 % of the nominal voltage.
5.6 Equipment vital to safety, where the voltage drop is critical, shall be supplied with the proper
voltage to achieve the rated performance.
NOTE 1 See Annex A for voltage drop calculations.
NOTE 2 A 3 % voltage drop is acceptable for this equipment.
NOTE 3 Examples of circuits that can be dependent on a minimum voltage drop include:
a) panel board/switchboard main conductors;
6 © ISO 2020 – All rights reserved

ISO 13297:2020(E)
b) navigation lights;
c) bilge blowers;
d) bilge pumps.
6 General requirements, AC systems
6.1 The protective conductor insulation shall be green or green with a yellow stripe. Neither colour
shall be used for current-carrying conductors.
NOTE The equipotential bonding conductor of the DC electrical system also uses green or green with a
yellow stripe insulation and is connected to various exposed conductive parts of DC electrical devices, other
extraneous conductive parts and the DC negative ground/earth.
6.2 For craft having a fully insulated DC system, the AC protective conductor shall be connected to:
a) for metallic hulled craft, the hull;
b) for non-conductive hulls, the craft's external ground/earth or ground plate.
6.3 The AC protective conductor(s) shall be provided with a final (single) connection to the hull of a
metallic hull craft, or, if the craft has a non-metallic hull, to the main grounding/earthing point of the craft.
6.4 On metallic hulls, the point of connection of the protective conductor shall be located above any
anticipated water accumulation.
6.5 Metallic housings or enclosures of permanently installed AC electrical appliances shall be
connected to the protective conductor system in the craft.
6.6 Individual circuits shall not be capable of being energized by more than one source of electrical
power at a time. Each shore power inlet, generator or inverter is a separate source of electrical power.
The transfer from one power source circuit to another shall be made by a means which opens all current-
carrying conductors, active (phase) and neutral, before closing the alternate source circuit, to prevent
arc-over between contacts, and should be interlocked by mechanical or electromechanical means. A
device that simultaneously breaks both current carrying conductors, active (phase) and neutral, shall be
used when changing power sources.
The requirements for overcurrent protection are found in Clause 13. A combination of power sources
can be used provided that:
a) the device is constructed and tested to an applicable recognized standard;
b) the device includes protection to prevent backfeeding to shore power (anti-islanding protection);
c) the device includes personnel protection against backfeeding;
d) the installation is performed according to the manufacturer’s instructions.
6.7 Energized parts of electrical equipment shall be guarded against accidental contact by the use of
enclosures conforming to at least IEC 60529:1989-IP 2X or other protective means which shall not be
used for non-electrical equipment. Access to energized parts of the electrical system shall require the use
of hand tools or be at least IP 2X, unless otherwise specified. A suitable warning sign shall be displayed
(see 7.2).
6.8 The neutral conductor shall be grounded (earthed) only at the source of power, i.e. at the onboard
generator, the secondary windings of the isolation or polarization transformer, the shore power
ISO 13297:2020(E)
connection or inverter. The shore power neutral shall be grounded (earthed) through the shore power
cable and shall not be grounded (earthed) on board the craft or:
a) for systems using an isolation transformer or polarization transformer, both the generator
or inverter neutral and the transformer secondary neutrals may be grounded at the AC main
grounding bus instead of at the generator, inverter, or transformer secondaries;
b) for systems using an isolation transformer or polarization transformer, or no shore power
provision, both the generator or inverter neutral and the transformer secondary neutrals may be
ungrounded provided double-pole protection and switching is installed.
6.9 When a galvanic isolator is fitted in the protective conductor, failure of the isolator shall not result
in an open circuit.
6.10 If the polarity of the system must be maintained for the proper operation of the electrical devices
in the system, reverse polarity indicating devices providing a continuous visible or audible signal shall be
installed in shore power systems and shall respond to the reversal of the active (phase) and the neutral
conductors. Otherwise, a branch circuit shall be provided with overcurrent protection in only the active
(phase) conductor.
Reverse polarity indicating devices are not required on craft employing:
a) unpolarized systems using double-pole branch circuit protection;
b) polarization or isolation transformers that establish polarity on the craft.
NOTE 1 Reverse polarity indicating devices might not respond to reversals of a live conductor and the
protective conductor.
NOTE 2 Reverse polarity indicating devices respond to the reversal of an active (phase) conductor or grounded
conductor only when there is continuity of the protective conductor to shore.
7 Marking, AC systems
7.1 Shore power inlets shall be marked to indicate voltage and current; they shall also be marked with
the electricity warning symbol (ISO 7010:2019-W012) and the "refer to instruction manual/booklet"
symbol (ISO 7010:2019-M002).
7.2 A permanently mounted waterproof warning sign shall be located at the panel board on the craft.
The sign shall include the information shown in Figure 1 a) or 1 b).

8 © ISO 2020 – All rights reserved

ISO 13297:2020(E)
General warning sign Warning; Electricity Warning; Refer to instruction
ISO 7010-W001 ISO 7010-W012 Flammable material manual/booklet
ISO 7010-W021 ISO 7010-M002
a)  Suggested warning sign using symbols

WARNING — To minimize shock and fire hazards:
1) Turn off craft's shore power connection switch before connecting or disconnecting shore
power cable.
2) Connect shore power cable to craft's inlet before connecting to shore power source.
3) If incorrect polarity is indicated, immediately disconnect cable.
4) Disconnect shore power cable at shore power source first.
5) Close shore power inlet cover tightly.
DO NOT ALTER SHORE POWER CABLE CONNECTORS

b)  Suggested warning sign with text in language appropriate to the country of use

Item 3 is required only if a polarity indicator is installed in the system.
Items 2, 4 and 5 are not required for permanently connected shore power cable installations.
Figure 1 — Suggested warning signs
7.3 Electrical equipment shall be marked or identified to indicate:
a) manufacturer's identification;
b) model number or designation;
c) electrical rating, in volts and amperes or volts and watts;
d) phase and frequency, if applicable;
e) ignition protection, if applicable, in accordance with ISO 8846:1990.
8 Batteries, DC systems
8.1 Batteries shall be permanently installed in a dry, ventilated location above anticipated bilge
water level.
ISO 13297:2020(E)
8.2 Batteries shall be installed in a manner to restrict their movement horizontally and vertically
considering the intended use of the craft, including trailering if applicable. A battery, as installed, shall not
move more than 10 mm in any direction when exposed to a force corresponding to twice the battery weight.
8.3 Batteries as installed in the craft shall be capable of inclinations of up to 30° without leakage of
electrolyte. Means shall be provided in monohull sailing craft for containment of any spilled electrolyte
up to inclinations of 45°.
8.4 Batteries shall be installed, designed or protected so that metallic objects cannot come in
unintentional contact with any battery terminal.
8.5 Batteries, as installed, shall be protected against mechanical damage at their location or within
their enclosure.
8.6 Batteries shall not be installed directly above or below a fuel tank or fuel filter without an
intervening deck or structure to isolate fuel components.
8.7 Any metallic component of the fuel system within 300 mm and above the battery top, as installed,
shall be electrically insulated. See Figure 2.
Front Side Top
a)  Top terminal battery
Front Side Top
b)  Side terminal battery
All indicated distances are min. 300 mm.
Figure 2 — Free space around battery
8.8 Battery cable terminals shall not depend on spring tension for mechanical connection to the
battery terminals.
8.9 Battery ventilation shall be provided to prevent the accumulation of explosive gases which might
be emitted from batteries.
10 © ISO 2020 – All rights reserved

ISO 13297:2020(E)
9 Battery-disconnect switch, DC systems
9.1 A battery-disconnect switch shall be installed in the positive conductor of a system with grounded/
earthed negative or the positive and negative conductor (simultaneously switched) of a fully insulated
two-wire DC system. The disconnect switch shall be installed in a readily accessible location, and as close
as practical to the battery or group of batteries. The following constitute exceptions:
a) outboard-powered craft with engine starting and navigation lighting circuits only;
b) 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;
c) engine/fuel tank compartment ventilation exhaust blower if separately protected by a fuse or
circuit breaker as close as practical to the battery terminal;
d) charging devices which are intended to be used when the craft is unattended (e.g. solar panels,
wind generators) if individually protected by a fuse or circuit breaker as close as practical to the
battery terminal.
9.2 Battery switch ratings - The 30-second rating of a battery switch shall not be less than the maximum
cranking current of the largest engine cranking motor that it serves. The minimum continuous rating of a
battery switch shall be the total of the ampacities of the main overcurrent protection devices connected
to the battery switch, or the ampacity of the feeder cable to the switch, whichever is less
9.3 Remote controlled battery disconnect switches, if used, shall also permit safe manual operation.
10 Power source options, AC systems
10.1 Power for the AC system shall be supplied by one of the following means:
a) single shore power cable, power inlet, wiring and components with a capacity to supply the
required design system load;
b) separate shore power cables, power inlets, wiring and components with a capacity to supply the
required design system loads;
c) inverter supplying AC power from the craft's DC system;
d) onboard AC generator(s) supplying the required system load;
e) combination of shore power cable(s), onboard generator(s), inverters or inverter/chargers used
simultaneously if the craft's circuitry is arranged such that the load connected to each source is
isolated from the other sources or supplies are combined in accordance with 6.6.
10.2 The shore power cable(s) alone or with onboard generator(s) capacity shall be at least as large as
the required system load(s).
10.3 Except for the system indicated in the Note below, the power feeder conductor from the AC
generator shall be protected at the generator with overcurrent protection devices with a rating such that
120 % of the generator nominal output is not exceeded.
NOTE Self-limiting (self-adjusting) generators whose maximum overload current does not exceed 120 % of
its rated current output do not require additional external overcurrent protection.
See Annex D for examples of AC system diagrams.
ISO 13297:2020(E)
11 Inverters and inverter/charg
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