SIST HD 60364-7-721:2019

SLOVENSKI STANDARD
01-junij-2019
Nadomešča:
SIST HD 60364-7-721:2009
Nizkonapetostne električne inštalacije - 7-721. del: Zahteve za posebne inštalacije
ali lokacije - Električne inštalacije v počitniških prikolicah in avtodomih
Low-voltage electrical installations - Part 7-721: Requirements for special installations or
locations - Electrical installations in caravans and motor caravans
Errichten von Niederspannungsanlagen - Teil 7-721: Anforderungen für Betriebsstätten,
Räume und Anlagen besonderer Art - Elektrische Anlagen in Caravans und
Motorcaravans
Installations électriques à basse tension - Partie 7-721: Exigences pour les installations
ou emplacements spéciaux - Installations électriques dans les caravanes et caravanes à
moteur
Ta slovenski standard je istoveten z: HD 60364-7-721:2019
ICS:
43.100 Osebni avtomobili. Bivalne Passenger cars. Caravans
prikolice in lahke prikolice and light trailers
91.140.50 Sistemi za oskrbo z elektriko Electricity supply systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

HARMONIZATION DOCUMENT HD 60364-7-721

DOCUMENT D'HARMONISATION
HARMONISIERUNGSDOKUMENT
February 2019
ICS 29.020; 91.140.50 Supersedes HD 60364-7-721:2009
English Version
Low-voltage electrical installations - Part 7-721: Requirements
for special installations or locations - Electrical installations in
caravans and motor caravans
(IEC 60364-7-721:2017, modified)
Installations électriques à basse tension - Partie 7-721: Errichten von Niederspannungsanlagen - Teil 7-721:
Exigences pour les installations ou emplacements spéciaux Anforderungen für Betriebsstätten, Räume und Anlagen
- Installations électriques dans les caravanes et caravanes besonderer Art - Elektrische Anlagen in Caravans und
à moteur Motorcaravans
(IEC 60364-7-721:2017) (IEC 60364-7-721:2017)
This Harmonization Document was approved by CENELEC on 2018-12-17. CENELEC members are bound to comply with the
CEN/CENELEC Internal Regulations which stipulate the conditions for implementation of this Harmonization Document at national level.
Up-to-date lists and bibliographical references concerning such national implementations may be obtained on application to the CEN-
CENELEC Management Centre or to any CENELEC member.
This Harmonization Document exists in three official versions (English, French, German).
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, Serbia, 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: Rue de la Science 23, B-1040 Brussels
© 2019 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. HD 60364-7-721:2019 E

European foreword
The text of document 64/2200/FDIS, future edition 2 of IEC 60364-7-721, prepared by IEC/TC 64 "Electrical
installations and protection against electrical shock" was submitted to the IEC-CENELEC parallel vote and
approved by CENELEC as HD 60364-7-721:2019.
A draft amendment, which covers common modifications to IEC 60364-7-721 (64/2200/FDIS), was prepared
by CLC/TC 64 "Electrical installations and protection against electric shock" and approved by CENELEC.
The following dates are fixed:
• latest date by which this document has (dop) 2019-12-17
to be implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2021-12-17
standards conflicting with this document
have to be withdrawn
This document supersedes HD 60364-7-721:2009.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Clauses, subclauses, notes, tables, figures and annexes which are additional to those in
IEC 60364-7-721:2017 are prefixed “Z”.
Endorsement notice
The text of the International Standard IEC 60364-7-721:2017 was approved by CENELEC as a European
Standard with agreed common modifications.
721.3.1.3
Add the term “caravan holiday home” below the term “mobile home”
721.521
721.521 Types of wiring systems
Replace 712.512.2 by:
721.521.2 The wiring system shall use one or more of the following:
a) insulated single-core cables, with flexible class 5 conductors, in conduits, conduit system, trunking or
trunking system;
b) insulated single-core cables, with stranded class 2 conductors (minimum of 7 strands); in conduit,
conduit systems, trunking, or trunking system;
c) sheathed flexible cables.
All cables shall as a minimum meet the requirements of EN 60332-1-2.
Conduits and conduits systems shall comply with the relevant part of EN 61386.
Cable trunking, cable trunking systems and cable ducting systems shall comply with the relevant part of EN
50085.
Add the following Annexes ZA and ZB
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

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.
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 60038 -  IEC standard voltages EN 60038 -
IEC 60309-2 -  Plugs, socket-outlets and couplers for EN 60309-2 -
industrial purposes -- Part 2: Dimensional
interchangeability requirements for pin and
contact-tube accessories
IEC 60332-1-2 -  Tests on electric and optical fibre cables EN 60332-1-2 -
under fire conditions -- Part 1-2: Test for
vertical flame propagation for a single
insulated wire or cable - Procedure for 1 kW
pre-mixed flame
IEC 60947-2 -  Low voltage switchgear and controlgear - Part EN 60947-2 -
2: Circuit-breakers
IEC 61008-1 -  Residual current operated circuit-breakers EN 61008-1 -
without integral overcurrent protection for
household and similar uses (RCCB's) -- Part
1: General rules
IEC 61009-1 -  Residual current operated circuit-breakers EN 61009-1 -
with integral overcurrent protection for
household and similar uses (RCBOs) -- Part
1: General rules
IEC 61084 series Cable trunking and ducting systems for - -
electrical installations
IEC 61386 series Conduit systems for cable management EN 61386 series
IEC 62423 -  Type F and type B residual current operated EN 62423 -
circuit-breakers with and without integral
overcurrent protection for household and
similar uses
Annex ZB
(normative)
Special national conditions
Special national condition: National characteristic or practice that cannot be changed even over a long
period, e.g. climatic conditions, electrical earthing conditions.
NOTE If it affects harmonization, it forms part of the Harmonization Document.
For the countries in which the relevant special national conditions apply these provisions are normative, for
other countries they are informative.
Country Clause Special national condition
DE 721.1 Scope
Add the following new note:
NOTE Z1  For extra low-voltage d.c. 12 V installations EN 1648-1 or EN 1648-
2 apply
GB 721.41 Add the following notes at the end of the subclause:
In the United Kingdom, UK law requires that the distributor shall not connect
his combined
neutral and protective conductor to any metalwork in a caravan or boat
(Regulation 9(4) of
The Electricity Safety, Quality and Continuity Regulations 2002 No. 2665).
DE 721.528.2.1 Replace the first Paragraph by the following ones:

“No electrical equipment including wiring systems, except
a) ELV-equipment for gas-supply control,
b) cables running through a gas compartment
shall be installed in any gas cylinder storage compartment.
ELV cables and electrical equipment may only be installed within the LPG
cylinder compartment or housing if the installation serves the operation of the
gas cylinder (e.g. indication of empty gas cylinders) or is for use within the
compartment or housing. Such electrical installations and components shall be
constructed and installed so that they are not a potential source of ignition.
Where cables have to run through such a compartment such cables shall be
protected against mechanical damage by installation within conduit or duct
passing through the compartment.”

DE 721.55.1.1 Replace this subclause by:
Any a.c. electrical inlet on the caravan shall be in compliance with EN 60309-2.
DE 721.55.2.6 In the first Paragraph delete the following text:
“If the appliance inlet installed under 721.55.1.1 complies only with EN 60309-
1,”
DE Annex B Add the following note after the heading:
(informative)
NOTE Z2  This annex does not apply to extra low-voltage d.c. 12 V
Extra low-
installations complying with EN 1648-1 and EN 1648-2.
voltage d.c.
installations
Country Clause Special national condition
DE Bibliography Add the following references:
EN 1648-1, Leisure accommodation vehicles – 12 V direct current extra low
voltage electrical installations – Part 1: Caravans
EN 1648-2, Leisure accommodation vehicles – 12 V direct current extra low
voltage electrical installations – Part 2: Motor caravans
B.721.521.2 Add "or flexible" after the word "stranded".

IEC 60364-7-721 ®
Edition 2.0 2017-06
INTERNATIONAL
STANDARD
Low-voltage electrical installations –

Part 7-721: Requirements for special installations or locations – Electrical

installations in caravans and motor caravans

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.020; 91.140.50 ISBN 978-2-8322-4425-8

– 2 – IEC 60364-7-721:2017 © IEC 2017
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
721 Electrical installations in caravans and motor caravans . 7
721.1 Scope . 7
721.2 Normative references . 7
721.3 Terms and definitions . 8
721.31 Purposes, supplies and structure . 8
721.313 Supplies . 8
721.4 Protection for safety . 9
721.41 Protection against electric shock . 9
721.411 Protective measure: automatic disconnection of supply . 9
721.413 Protective measure: electrical separation . 9
721.414 Protective measure: extra-low voltage provided by SELV and PELV . 9
721.415 Additional protection . 9
721.43 Protection against overcurrent . 10
721.5 Selection and erection of equipment . 10
721.51 Common rules . 10
721.510 Introduction . 10
721.512 Operational conditions and external influences . 10
721.514 Identification . 10
721.52 Wiring systems . 10
721.521 Types of wiring systems . 10
721.522 Selection and erection of wiring systems in relation to external
influences . 11
721.524 Cross-sectional areas of conductors . 11
721.526 Electrical connections . 11
721.528 Proximity of wiring systems to other services . 11
721.53 Isolation, switching and control . 12
721.536 Isolation and switching . 12
721.54 Earthing arrangements and protective conductors . 12
721.543 Protective conductors . 12
721.55 Other equipment . 12
Annex A (normative) Instructions for electricity supply . 14
Annex B (informative) Extra low-voltage DC installations . 15
Annex C (informative) Current-carrying capacities . 21
Annex D (informative) List of notes concerning certain countries . 24
Bibliography . 25

Figure C.721.1 – Graph for obtaining minimum cross-sectional area for conductors for
fixed wiring installations with a voltage drop of 0,8 V . 21
Figure C.721.2 – Graph for obtaining minimum cross-sectional area for conductors for
battery cable installations with a voltage drop of 0,3 V . 22

IEC 60364-7-721:2017 © IEC 2017 – 3 –
Table 721.1 – Cross-sectional areas of flexible cords and cables for caravan
connection . 13
Table B.721.1 – Functional allocation and cross-sectional areas of cores for caravan
connectors . 18

– 4 – IEC 60364-7-721:2017 © IEC 2017
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
LOW-VOLTAGE ELECTRICAL INSTALLATIONS –

Part 7-721: Requirements for special installations or locations –
Electrical installations in caravans and motor caravans

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 60364-7-721 has been prepared by IEC technical committee 64:
Electrical installations and protection against electrical shock.
This second edition cancels and replaces the first edition published in 2007. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) A minimum height of not less than 500 mm above the base of the cylinders is now required
for cables passing through the gas cylinder compartment. Where cables have to run
through a compartment such cables shall be protected against mechanical damage by
installation within a continuous conduit or duct passing through the compartment
(721.528.3.1).
IEC 60364-7-721:2017 © IEC 2017 – 5 –
b) It is now required that each independent installation shall be provided with its own main
isolating switch which shall disconnect all live conductors and which shall be suitably
placed in a readily accessible location in the caravan.(721.536.2.1.1)
c) The clause numbers for the protective measures not permitted (obstacles, placing out of
reach, non-conducting locations and earth-free local equipotential bonding) have been
changed.
The text of this International Standard is based on the following documents:
FDIS Report on voting
64/2200/FDIS 64/2210/RVD
Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts in the IEC 60364 series, published under the general title Low-voltage
electrical installations, can be found on the IEC website.
The reader's attention is drawn to the fact that Annex D lists all of the “in-some-country”
clauses on differing practices of a less permanent nature relating to the subject of this
standard.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.

– 6 – IEC 60364-7-721:2017 © IEC 2017
INTRODUCTION
For the purpose of this part (IEC 60364-7-721) the requirements of the general Parts 1 to 6 of
IEC 60364 apply.
The IEC 60364-7-7XX parts of IEC 60364 contain particular requirements for special
installations or locations which are based on the requirements of the general parts of
IEC 60364 (IEC 60364-1 to IEC 60364-6). These IEC 60364-7-7XX parts are considered in
conjunction with the requirements of the general parts.
The particular requirements of this part of IEC 60364 supplement, modify or replace certain of
the requirements of the general parts of IEC 60364 being valid at the time of publication of
this part. The absence of reference to the exclusion of a part or a clause of a general part
means that the corresponding clauses of the general part are applicable (undated reference).
Requirements of other 7XX parts being relevant for installations covered by this part also
apply. This part may therefore also supplement, modify or replace certain of these
requirements valid at the time of publication of this part.
The clause numbering of this part follows the pattern and corresponding references of
IEC 60364. The numbers following the particular number of this part are those of the
corresponding parts, or clauses of the other parts of the IEC 60364 series, valid at the time of
publication of this part, as indicated in the normative references of this document (dated
reference).
If requirements or explanations additional to those of the other parts of the IEC 60364 series
are needed, the numbering of such items appears as 721.101, 721.102, 721.103 etc.
In the case where new or amended general parts with modified numbering were published
after this part was issued, the clause numbers referring to a general part in this 721 part may
no longer align with the latest edition of the general part. Dated references should be
observed.
IEC 60364-7-721:2017 © IEC 2017 – 7 –
LOW-VOLTAGE ELECTRICAL INSTALLATIONS –

Part 7-721: Requirements for special installations or locations –
Electrical installations in caravans and motor caravans

721 Electrical installations in caravans and motor caravans
721.1 Scope
The particular requirements of this part of IEC 60364 apply to electrical installations in
caravans and motor caravans.
They apply to those electrical circuits and equipment intended for the use of the caravan for
habitation purposes.
They do not apply to those electrical circuits and equipment for automotive purposes.
They do not apply to the electrical installations of mobile homes, residential park homes and
transportable units.
NOTE 1 For mobile homes and residential park homes the general requirements apply.
NOTE 2 For transportable units see IEC 60364-7-717.
NOTE 3 For the purposes of this document, caravans and motor caravans are referred to as “caravans”
The particular requirements of some parts from the IEC 60364-7 series can also apply to such
installations in caravans, for example IEC 60364-7-701.
721.2 Normative references
The following documents are referred to in the text in such a way that some or all of their
content constitutes requirements of this document. For dated references, only the edition
cited applies. For undated references, the latest edition of the referenced document (including
any amendments) applies
IEC 60038, IEC standard voltages
IEC 60309-2, Plugs, socket-outlets and couplers for industrial purposes – Part 2: Dimensional
interchangeability requirements for pin and contact-tube accessories
IEC 60332-1-2, Tests on electric and optical fibre cables under fire conditions – Part 1-2: Test
for vertical flame propagation for a single insulated wire or cable – Procedure for 1 kW pre-
mixed flame
IEC 60947-2, Low-voltage switchgear and controlgear – Part 2: Circuit-breakers
IEC 61008-1, Residual current operated circuit-breakers without integral overcurrent
protection for household and similar uses (RCCBs) – Part 1: General rules
IEC 61009-1, Residual current operated circuit-breakers with integral overcurrent protection
for household and similar uses (RCBOs) – Part 1: General rules
IEC 61084 (all parts), Cables trunking and ducting systems for electrical installations

– 8 – IEC 60364-7-721:2017 © IEC 2017
IEC 61386 (all parts), Conduit systems for cable management
IEC 62423, Type F and Type B residual current operated circuit-breakers with and without
integral overcurrent protection for household and similar uses
721.3 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:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
721.3.1
leisure accommodation vehicle
unit of living accommodation for temporary or seasonal occupation that may meet the
requirements for the construction and use of road vehicles
721.3.1.1
caravan
trailer leisure accommodation vehicle, used for touring, that meets the requirements for the
construction and use of road vehicles
721.3.1.2
motor caravan
self-propelled leisure accommodation vehicle, used for touring, that meets the requirements
for the construction and use of road vehicles
Note 1 to entry: A motor caravan is either adapted from a series production vehicle, or designed and built on an
existing chassis, with or without the driving cab, the accommodation being either fixed or dismountable.
721.3.1.3
mobile home
transportable leisure accommodation vehicle that includes means for mobility but does not
meet the requirements for the construction and use of road vehicles
721.3.1.4
residential park home
factory produced relocatable dwelling
721.31 Purposes, supplies and structure
721.313 Supplies
721.313.1 General
721.313.1.101 The nominal supply system voltage shall be selected from IEC 60038.
The nominal AC supply voltage of the installation of the caravan shall not exceed 230 V
single-phase, or 400 V three-phase.
The nominal DC supply voltage of the installation of the caravan shall not exceed 48 V.

IEC 60364-7-721:2017 © IEC 2017 – 9 –
721.4 Protection for safety
721.41 Protection against electric shock
721.410.3.5
Add the following:
The protective measures of obstacles and placing out of reach as specified in Annex B of
IEC 60364-4-41:2005 shall not be used.
721.410.3.6
Add the following:
The protective measures of non-conducting locations and earth-free local equipotential
bonding as specified in Annex C of IEC 60364-4-41:2005 shall not be used.
NOTE This precludes the use of class 0 equipment.
721.411 Protective measure: automatic disconnection of supply
721.411.3.1.2 Protective equipotential bonding
Metal frame parts or thereto connected construction parts shall be connected through main
protective bonding conductors to the main earthing terminal within the caravan.
721.413 Protective measure: electrical separation
The protective measure: electrical separation shall not be used, except for a shaver socket-
outlet.
721.414 Protective measure: extra-low voltage provided by SELV and PELV
Any part of a caravan installation operating at extra-low voltage shall comply with the
requirements of Clause 414.
For extra-low voltage DC power sources, a maximum of 48 V are allowed. In exceptional
cases, when AC extra-low voltage is required, the voltage (rms) is not allowed to exceed
48 V.
The requirements of Part 721 are also applicable to extra low-voltage DC installation. See
Annex B for recommendations that can be applied in addition.
721.415 Additional protection
721.415.101 Additional protection: residual current protective devices (RCDs)
Addition:
Where protection by automatic disconnection of supply is used, a residual current device with
a rated residual operating current not exceeding 30 mA, complying with IEC 60947-2,
IEC 61008-1, IEC 61009-1 or IEC 62423
...