SIST EN ISO 16315:2026

SLOVENSKI STANDARD
01-september-2026
Mala plovila - Električni sistemi za električni pogon (ISO 16315:2026)
Small craft - Electrical systems used for electrical propulsion (ISO 16315:2026)
Kleine Wasserfahrzeuge - Elektrische Antriebssysteme (ISO 16315:2026)
Petits navires - Systèmes électriques utilisés pour la propulsion électrique (ISO
16315:2026)
Ta slovenski standard je istoveten z: EN ISO 16315:2026
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 16315
EUROPEAN STANDARD
NORME EUROPÉENNE
July 2026
EUROPÄISCHE NORM
ICS 47.080 Supersedes EN ISO 16315:2016
English Version
Small craft - Electrical systems used for electrical
propulsion (ISO 16315:2026)
Petits navires - Systèmes électriques utilisés pour la Kleine Wasserfahrzeuge - Elektrische Antriebssysteme
propulsion électrique (ISO 16315:2026) (ISO 16315:2026)
This European Standard was approved by CEN on 26 January 2026.

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, Türkiye 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
© 2026 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 16315:2026 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 16315:2026) has been prepared by Technical Committee ISO/TC 188
"Small craft" in collaboration with Technical Committee CEN/TC 464 “Small Craft” the secretariat
of which is held by SIS.
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 January 2027, and conflicting national
standards shall be withdrawn at the latest by January 2027.
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 16315:2016.
This document has been prepared under a standardization request addressed to CEN by the
European Commission. The Standing Committee of the EFTA States subsequently approves these
requests for its Member States.
For the relationship with EU Legislation, see informative Annex ZA, which is an integral part of
this document.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
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, Türkiye and the United Kingdom.
Endorsement notice
The text of ISO 16315:2026 has been approved by CEN as EN ISO 16315:2026 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 and application of the
edition of the normatively referenced standards as given in Table ZA.2 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) Remarks/Notes
Directive 2013/53/EU of this EN
Annex 1A, Clause 5.3 para 1 4.3 (except 4.3.1), 4.13, 5 Electrical systems to be
(except 5.1.1.2), 8, 9 designed and installed so as to
ensure proper operation of the
watercraft under normal
conditions of use
Annex 1A, Clause 5.3 para 1 4.3 (except 4.3.1), 4.13, 6, 8.5 Electrical systems to be
designed and installed so as to
minimise risk of fire and
electric shock
Annex 1A, Clause 5.3 para 2 4.4, 7 All electrical circuits, except
engine starting circuits
supplied from batteries, to
remain safe when exposed to
overload
Annex 1A, Clause 5.3 para 3 9, 10 (except 10.3.2) Electric propulsion circuits to
not interact with other circuits
in such a way that either
would fail to operate as
intended
Annex 1A, Clause 5.3 para 4 4.1.3 a (except 4.1.2 and 4.1.5), Ventilation being provided to
8.5, Annex B(a) prevent the accumulation of
explosive gases which might
be emitted from batteries
Annex 1A, Clause 5.3 para 4 8 Batteries being secured and
protected from ingress of
water
Annex IA, Clause 2.5 – Owner’s 4.12, 5 (except 5.1.1.2), Clause 4.12, Figure 1 gives
Essential Requirements of Clause(s)/sub-clause(s) Remarks/Notes
Directive 2013/53/EU of this EN
Manual Annex A enclosure hazard markings
Clause 5 provides elements on
system alerts and alarms to be
included in the owner’s
manual
Annex A provides elements
necessary for safe use of the
product drawing particular
attention to set up,
maintenance, regular
operation, the prevention of
risks and risk management
Table ZA.2 — Normative references from Clause 2 of this document and their
corresponding European publications
Column 1 Column 2 Column 3 Column 4
Reference in International Title Corresponding
Clause 2 Standard Edition European Standard
Edition
ISO 8665-2 ISO 8665-2:2024 Small craft — Power EN ISO 8665-2:2024
measurements and
declarations —Part 2:
Electric marine
propulsion
ISO 8846 ISO 8846:1990 Small craft — EN ISO 8846:2026
Electrical devices —
Protection against
ignition of surrounding
flammable gases
ISO 13297 ISO 13297:2020 Small craft — EN ISO 13297:2021
Electrical systems —
ISO 13297:2020/Amd EN ISO
Alternating and direct
1:2022 13297:2021/A1:2022
current installations
EN ISO
13297:2021/A11:2023
ISO 25197 ISO 25197:2020 Small craft — EN ISO 25197:2020
Electrical/electronic
ISO 25197:2020/Amd EN ISO
control systems for
1:2022 25197:2020/A1:2022
steering, shift and
EN ISO
throttle
25197:2020/A12:2026
IEC 60034-1 IEC 60034-1:2022 Rotating electrical
EN 60034-1:2010
machines – Part 1:
EN 60034-
Rating and
1:2010/corrigendum Oct.
performance
IEC 60092-202 IEC 60092-202:2016 Electrical installation For applicable standard
in ships — Part 202: edition see Column 2
Column 1 Column 2 Column 3 Column 4
Reference in International Title Corresponding
Clause 2 Standard Edition European Standard
Edition
System design —
Protection
IEC 60092-303 IEC 60092-303:2023 Electrical installation For applicable standard
in ships — Part 303: edition see Column 2
Equipment —
Transformers for
power and lighting
IEC 60092-352 IEC 60092-352:2005 Electrical installation For applicable standard
in ships — Part 352: edition see Column 2
Choice and installation
of electrical cables
IEC 60092-507 IEC 60092-507:2014 Electrical installations EN 60092-507:2015
in ships — Part 507:
EN 60092-
Small vessels
507:2015/AC:2015
IEC 60146-1- IEC 60146-1-1:2024 Semiconductor EN IEC 60146-1-1:2024
1:2024 converters — General
requirements and line
commutated
converters — Part 1-1:
Specification of basic
requirements
IEC 60445 IEC 60445:2021 Basic and safety EN IEC 60445:2021
principles for man-
EN IEC
machine interface,
60445:2021/A1:2026
marking and
identification -
Identification of
equipment terminals,
conductor
terminations and
conductors
IEC 60898-1 IEC 60898- Electrical accessories EN 60898-1:2019
1:2015+AMD1:2019 — Circuit-breakers for
EN 60898-
CSV overcurrent protection
1:2019/A1:2024
for household and
Consolidated version
EN 60898-
similar installations —
1:2019/A11:2024
Part 1: Circuit-
breakers for a.c.
operation
IEC 60947-1 IEC 60947-1:2020 Low-voltage EN IEC 60947-1:2021
switchgear and
EN IEC 60947-
controlgear — Part 1:
1:2021/AC:2023-01
General rules
EN IEC 60947-
1:2021/AC:2024-05
Column 1 Column 2 Column 3 Column 4
Reference in International Title Corresponding
Clause 2 Standard Edition European Standard
Edition
IEC 61558-2-4 IEC 61558-2-4:2021 Safety of transformers, EN IEC 61558-2-4:2025
reactors, power supply
units and
combinations thereof
— Part 2-4: Particular
requirements and tests
for isolating
transformers and
power supply units
incorporating isolating
transformers for
general applications
The documents listed in the Column 1 of Table ZA.2, in whole or in part, are normatively
referenced in this document, i.e. are indispensable for its application. The achievement of the
presumption of conformity is subject to the application of the edition of Standards as listed in
Column 4 or, if no European Standard Edition exists, the International Standard Edition given in
Column 2 of Table ZA.2.
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
Standard
ISO 16315
Second edition
Small craft — Electrical systems
2026-02
used for electrical propulsion
Petits navires — Systèmes électriques utilisés pour la propulsion
électrique
Reference number
ISO 16315:2026(en) © ISO 2026
ISO 16315:2026(en)
© ISO 2026
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 16315:2026(en)
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 General requirements . 5
4.1 General .5
4.2 Components of an electric propulsion system .6
4.3 Electric propulsion systems .6
4.4 Configuration of electrical systems sharing a common energy source for propulsion
and service power . .8
4.4.1 DC systems . .8
4.4.2 AC systems .8
4.5 Environmental factors .9
4.6 Electrical ratings .9
4.7 Equipment .10
4.7.1 Transformers .10
4.7.2 Converters .10
4.7.3 Motors .10
4.8 Enclosures.10
4.9 Identification of equipment and conductors .10
4.10 Electromagnetic compatibility (EMC) .11
4.11 Electrical equipment in the vicinity of batteries .11
4.12 Hazardous areas . 12
4.13 Fire protection . 12
5 Controls, monitoring, system alerts and trip alarms .12
5.1 Electrical/electronic controls for electric propulsion systems . 12
5.1.1 Controls . 12
5.1.2 Emergency stop . 13
5.1.3 Fault trip reset . 13
5.2 Instruments, alerts and trip alarms . 13
5.2.1 General . 13
5.2.2 Operating mode and status .14
5.2.3 System alerts .14
5.2.4 Fault trip alarms .14
6 Protection against electric shock . 14
6.1 Protection against direct contact .14
6.2 Automatic disconnection of supply to the electric propulsion system under fault-to-
earth conditions (earthed two-wire DC systems and earthed neutral AC systems) . 15
6.3 Fault-to-earth monitoring for DC fully insulated systems and DC three-wire systems . 15
6.4 Fault-to-earth tripping in AC non-neutral earthed systems (IT-type system) .16
7 Protection against overcurrent .16
7.1 General .16
7.2 Characteristics of protective devices .16
7.3 Overcurrent protection devices in the outgoing circuit(s) from a battery .17
7.4 Overcurrent protection devices in fully insulated systems .17
7.4.1 Single pole overcurrent protection .17
7.4.2 Dual pole overcurrent protection .17
8 Battery monitoring and installation . 17
8.1 General arrangements .17
8.2 Isolation of batteries or battery banks .18
8.3 Operational switching of battery(s) or battery bank(s) .18

iii
ISO 16315:2026(en)
8.4 Permanently energized circuits .18
8.5 Ventilation .19
9 Electrical installation . 19
9.1 General .19
9.2 Segregation of electrical propulsion system cables .19
10 Testing. 19
10.1 General .19
10.2 Earthing and bonding. 20
10.3 Insulation resistance. 20
10.3.1 General . 20
10.3.2 DC electrical propulsion systems . 20
10.3.3 AC electrical propulsion systems . 20
10.3.4 Switchboards, panel boards and distribution boards . 20
10.3.5 Power and lighting final circuits . 20
10.3.6 Generators and motors .21
10.3.7 Transformers .21
10.4 Electrical/electronic controls systems for propulsion motor control .21
10.5 On load test and inspection of electrical propulsion systems, and associated switch
gear and control gear .21
10.6 Voltage drop .21
Annex A (normative) Information and instructions for the owner’s manual .22
Annex B (normative) Installation documentation .23
Annex C (informative) Electromagnetic compatibility documents .24
Bibliography .25

iv
ISO 16315:2026(en)
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 document 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).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
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 second edition cancels and replaces the first edition (ISO 16315:2016), which has been technically
revised.
The main changes are as follows:
— the overcurrent protection requirements have been clarified;
— the fault monitoring requirements for isolated DC systems have been revised.
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.

v
ISO 16315:2026(en)
Introduction
Electrical propulsion systems are becoming more common in recreational craft and other small craft and
propulsion system voltages of up to AC 1 000 V and DC 1 500 V are possible together with variable speed
drives operating at frequencies which differ from 50/60 Hz or DC.
Electric propulsion systems for small craft are generally designed and constructed from a number of
component parts many of which can be of proprietary origin and all of the electrical and control items are
interconnected by cables and operated as a system.
A propulsion system designer/installer should be competent with all components of the system addressed
by this standard, as well as all aspects of any other equipment included in the design of a system such that
the component parts of the propulsion system are integrated in a complete and safe manner.
There are a significant number of electrical propulsion system architectures for small craft and the main
types are the following.
— DC sourced. The main power source is a propulsion battery or battery bank which is either recharged
from on-board DC generators, or on-board AC generators/an AC shore supply through battery chargers.
The electric propulsion system(s) can be variable speed through a DC motor controller or AC through a
Variable Frequency Drive (VFD) or be fixed speed with a variable pitch propeller or other mechanical
means of providing thrust. The electric propulsion system can be electrically separate from other
electrical systems on-board (e.g. be fully insulated via the motor controller, or be an AC IT system via
a VFD or motor starter). Or the electrical propulsion system can be integrated with the whole craft DC
electrical system using converters DC/DC, DC/AC to provide for different services/consumers.
— AC sourced. The main power source is AC generator(s). The electric propulsion system(s) can be DC
variable speed through an AC/DC converter and DC motor controller, or AC through a VFD, or be fixed
speed with a variable pitch propeller or other mechanical means of providing thrust. The electric
propulsion system can be DC fully insulated system or be an AC IT system via a galvanically isolated VFD
or via an isolating transformer. A DC propulsion system(s) can be supported by a propulsion battery or
battery bank.
— Also possible are hybrid systems similar to the types being introduced for road vehicles where the source
is an internal combustion engine providing, for example, energy to a relatively lightweight energy storage
system with power take-off via converters to propulsion motor(s) and other electrical consumers.
It is essential that the electric propulsion system designer/installer be competent with all aspects of the
equipment included in the design of a particular system such that the component parts of the propulsion
system are integrated in a coherent and safe manner.
Current electrical standards for small craft of less than 24 m L are as follows:
H
a) ISO 13297, which covers extra-low-voltage direct current (DC) electrical systems that operate at
nominal potentials of 50 V DC or less and single-phase alternating current (AC) systems that operate at
a voltage not exceeding AC 250 V. It does not include requirements for electrical propulsion systems.
b) IEC 60092-507, which is applicable to small craft up to 50 m/500 GT and includes requirements for
three-phase systems not exceeding AC 500 V and single-phase systems not exceeding AC 250 V, and for
DC systems and sub-systems not exceeding DC 50 V nominal. It includes a section on electric propulsion
systems.
vi
International Standard ISO 16315:2026(en)
Small craft — Electrical systems used for electrical propulsion
1 Scope
This document specifies the design and installation of alternating current (AC) and direct current (DC)
electrical systems used for the purpose of electrical propulsion and/or the electrical part of a hybrid
propulsion system (system with both a rechargeable battery and a fuelled power source).
This document is applicable to electrical propulsion systems operated in the following ranges either
individually or in combination:
— direct current of less than 1 500 V DC;
— single-phase alternating current up to AC 1 000 V;
— three-phase alternating current up to AC 1 000 V.
This document is applicable to electrical propulsion systems installed in small craft up to 24 m length of the
hull (L in accordance with ISO 8666).
H
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 8665-2, Small craft — Power measurements and declarations — Part 2: Electric marine propulsion
ISO 8846, Small craft — Electrical devices — Protection against ignition of surrounding flammable gases
ISO 13297, Small craft — Electrical systems — Alternating and direct current installations
ISO 25197, Small craft — Electrical/electronic control systems for steering, shift and throttle
IEC 60034-1, Rotating electrical machines — Part 1: Rating and performance
IEC 60092-202, Electrical installation in ships — Part 202: System design — Protection
IEC 60092-303, Electrical installation in ships — Part 303: Equipment — Transformers for power and lighting
IEC 60092-352, Electrical installation in ships — Part 352: Choice and installation of electrical cables
IEC 60092-507, Electrical installations in ships — Part 507: Small vessels
IEC 60146-1-1:2024, Semiconductor converters — General requirements and line commutated converters —
Part 1-1: Specification of basic requirements
IEC 60445, Basic and safety principles for man-machine interface, marking and identification - Identification of
equipment terminals, conductor terminations and conductors
IEC 60898-1, Electrical accessories — Circuit-breakers for overcurrent protection for household and similar
installations — Part 1: Circuit-breakers for a.c. operation
IEC 60947-1, Low-voltage switchgear and controlgear — Part 1: General rules

ISO 16315:2026(en)
IEC 61558-2-4, Safety of transformers, reactors, power supply units and combinations thereof — Part 2-4:
Particular requirements and tests for isolating transformers and power supply units incorporating isolating
transformers for general applications
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
safety voltage
voltage which does not exceed AC 50 V root mean square (rms) between
conductors (3.19), or between any conductor and earth, in a circuit isolated from the supply by means such
as a safety isolating transformer (3.22), or converter with separate winding
Note 1 to entry: 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 (3.9) is involved.
Note 2 to entry: The voltage limit should not be exceeded either at full load or no load, but it is assumed, for the purpose
of this definition, that any transformer or converter is operated at its rated supply voltage.
3.2
safety voltage
voltage which does not exceed 50 DC V between conductors (3.19), or between any
conductor and earth, in a circuit which is isolated from higher voltage circuits
Note 1 to entry: 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 (3.9) is involved.
Note 2 to entry: The voltage limit should not be exceeded either at full load or no load, but it is assumed, for the purpose
of this definition, that any transformer (3.22) or converter is operated at its rated supply voltage.
3.3
rated voltage
U
0_TN
nominal alternating current (AC) root mean square (rms) line voltage to earth
[SOURCE: IEC 60092-507:2014, 3.1.4]
3.4
rated voltage
U
0_IT
nominal alternating current (AC) root mean square (rms) voltage between line conductor
(3.21) and neutral conductor (3.20)
[SOURCE: IEC 60092-507:2014, 3.1.4]
3.5
rated voltage
U
0_DC
nominal DC voltage between poles
[SOURCE: IEC 60092-507:2014, 3.1.4]

ISO 16315:2026(en)
3.6
maximum voltage
U
max_IT
measured maximum alternating current (AC) root mean square (rms) voltage between line
conductor (3.21) and neutral conductor (3.20)
3.7
maximum voltage
U
max_DC
the measured maximum DC voltage between poles
3.8
maximum voltage
U
max_TN
measured maximum alternating current (AC) root mean square (rms) line voltage to earth
3.9
live part
conductor (3.19) or conductive part intended to be energized in normal operation including a neutral
conductor (3.20), but by convention not a PEN conductor (a conductor combining the functions of both a
protective conductor (3.17) and a neutral conductor)
Note 1 to entry: This term does not necessarily imply risk of electric shock.
[SOURCE: IEC 60050-195:2021, 195-02-19, modified — “or a PEM conductor or PEL conductor” deleted. Text
in brackets added.]
3.10
earthed
grounded, en US
connected to the general mass of the hull of the craft in such a manner as will ensure at all times an
immediate discharge of electrical energy without danger
[SOURCE: IEC 60092-101:2018, 1.3.9]
3.11
readily accessible
capable of being reached quickly and safely for effective use without the use of tools
[SOURCE: ISO 13297:2020, 3.24]
3.12
final circuit
portion of a wiring system extending beyond the final overcurrent protection device (3.13) for that circuit
[SOURCE: IEC 60092-101:2018, 1.3.17, modified — “for that circuit” replaced “of a board”.]
3.13
overcurrent protection device
device provided to interrupt an electric circuit in case the conductor current in the electric circuit exceeds a
predetermined value for a specified duration
[SOURCE: IEC 60050-826:2004, 826-14-14]
3.14
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
Note 1 to entry: The fuse comprises all the parts that form the complete device.
[SOURCE: IEC 60050-441:1984, 441-18-01]

ISO 16315:2026(en)
3.15
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 a short circuit
[SOURCE: IEC 60050-441:1984, 441-14-20]
3.16
residual current device
RCD
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
[SOURCE: IEC 60050-442:1998, 442-05-02, modified — Note deleted.]
3.17
protective conductor
PE
conductor (3.19) provided for purposes of safety, for example, protection against electric shock
Note 1 to entry: In an electrical installation, the conductor identified PE is normally also considered as a protective
earthing conductor.
[SOURCE: IEC 60050-195:2021, 195-02-09]
3.18
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 cable screen of adjacent length of cable or
the bulkhead
[SOURCE: IEC 60092-101:2018, 1.3.7, modified — “cables in a radio-receiving room” deleted.]
3.19
conductor
conductive part intended to carry a specified electric current
[SOURCE: IEC 60050-195:2021, 195-01-07]
3.20
neutral conductor
conductor (3.19) electrically connected to the neutral point and capable of contributing to the distribution of
electrical energy
[SOURCE: IEC 60050-195:2021, 195-02-06]
3.21
line conductor
DEPRECATED: phase conductor (in AC systems)
DEPRECATED: pole conductor (in DC systems)
conductor (3.19) which is energized in normal operation and capable of contributing to the transmission or
distribution of electric energy but which is not a neutral conductor (3.20)
[SOURCE: IEC 60050-195:2021, 195-02-08]
3.22
transformer
energy converter with isolating separation between the input and output windings and the protective
conductor (3.17)
ISO 16315:2026(en)
3.23
switch
mechanical switching device capable of making, carrying and breaking currents under normal circuit
conditions, which can include specified operating overload conditions, and also carrying for a specified time
currents under specified abnormal circuit conditions such as those of a
...