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 .
...