HD 60364-7-721:2009

SLOVENSKI STANDARD
01-december-2009
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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 60364-7-721:2009
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
September 2009
HARMONISIERUNGSDOKUMENT
ICS 91.140.50; 29.020 Supersedes HD 384.7.754 S1:2005

English version
Low-voltage electrical installations -
Part 7-721: Requirements for special installations or locations -
Electrical installations in caravans and motor caravans
(IEC 60364-7-721:2007, modified)

Installations électriques à basse tension - Errichten von Niederspannungsanlagen -
Partie 7-721: Exigences Teil 7-721: Anforderungen
pour les installations für Betriebsstätten, Räume
ou emplacements spéciaux - und Anlagen besonderer Art -
Installations électriques dans Elektrische Anlagen in Caravans
les caravanes et caravanes à moteur und Motorcaravans
(CEI 60364-7-721:2007, modifiée) (IEC 60364-7-721:2007, modifiziert)

This Harmonization Document was approved by CENELEC on 2009-04-01. 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 Central Secretariat 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, Cyprus, the
Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: Avenue Marnix 17, B - 1000 Brussels

© 2009 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. HD 60364-7-721:2009 E

Foreword
The text of the International Standard IEC 60364-7-721:2007, prepared by IEC TC 64, Electrical
installations and protection against electric shock, together with common modifications prepared by
SC 64A, Protection against electric shock, of Technical Committee CENELEC TC 64, Electrical
installations and protection against electric shock, was submitted to the formal vote and was approved by
CENELEC as HD 60364-7-721 on 2009-04-01.
This Harmonization Document supersedes HD 384.7.754 S1:2005.
In this standard, the common modifications to the International Standard are indicated by a vertical line in
the left margin of the text.
The following dates were fixed:
– latest date by which the existence of the HD (doa) 2009-10-01
has to be announced at national level
– latest date by which the HD has to be implemented (dop) 2010-04-01
at national level by publication of a harmonized
national standard or by endorsement
– latest date by which the national standards conflicting (dow) 2012-04-01
with the HD have to be withdrawn
For this Harmonization Document the informative Annex D of IEC 60364-7-721:2007 shall be disregarded
and has been replaced by the normative Annex ZA, Special national conditions.
Annex ZA has been added by CENELEC.
________________
– 3 – HD 60364-7-721:2009
Introduction
The requirements of this part of HD 60364 supplement, modify or replace certain of the general
requirements in Parts 1 to 6 of HD 60364.
The clause numbering of Part 7-721 follows the pattern and corresponding references of HD 60364. The
numbers following the particular number of Part 7-721 are those of the corresponding parts or clauses of
HD 60364.
The absence of reference to a part or a clause means that the corresponding general requirements of
HD 60364 are applicable.
721.1 Scope
The particular requirements of this part of HD 60364 apply to the electrical installation of 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 HD 60364-7-717.
NOTE 3  For the purpose of this standard, caravans and motor caravans are referred to as “caravans”
NOTE Z1  For extra low-voltage d.c. 12 V installations, EN 1648-1 and EN 1648-2 apply.
The particular requirements of some parts from the HD 60364-7 series may also apply to such
installations in caravans, e.g. HD 60364-7-701.
721.2 Normative references
The following referenced documents are indispensable for the application 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.
EN 50085 (all parts), Cable trunking systems and cable ducting systems for electrical installations
HD 472 S1:1989 + Corr. 2002, Nominal voltages for low voltage public electricity supply systems
(IEC 60038:1983, mod.)
EN 60309-2, Plugs, socket-outlets and couplers for industrial purposes – Part 2: Dimensional
interchangeability requirements for pin and contact-tube accessories (IEC 60309-2)
EN 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 premixed flame
(IEC 60332-1-2)
EN 60335-1, Household and similar electrical appliances – Safety – Part 1: General requirements
(IEC 60335-1, mod.)
EN 60335-2-29, Household and similar electrical appliances – Safety – Part 2-29: Particular requirements
for battery chargers (IEC 60335-2-29)
HD 60364-5-51, Electrical installations of buildings – Part 5-51: Selection and erection of electrical
equipment - Common rules (IEC 60364-5-51, mod.)
HD 60364-7 (all parts), Low-voltage electrical installations – Part 7: Requirements for special installations
or locations (IEC 60364-7 all parts, mod.)
EN 60529, Degrees of protection provided by enclosures (IP Code) (IEC 60529)
EN 60947-2, Low-voltage switchgear and controlgear – Part 2: Circuit-breakers (IEC 60947-2)
EN 61008-1, Residual current operated circuit-breakers without integral overcurrent protection for
household and similar uses (RCCBs) – Part 1: General rules (IEC 61008-1, mod.)
EN 61009-1, Residual current operated circuit-breakers with integral overcurrent protection for household
and similar uses (RCBOs) – Part 1: General rules (IEC 61009-1, mod.)
EN 61386 (all parts), Conduit systems for cable management (IEC 61386 all parts)

– 5 – HD 60364-7-721:2009
EN 61558-2-6, Safety of transformers, reactors, power supply units and similar products for supply
voltages up to 1 100 V – Part 2-6: Particular requirements and tests for safety isolating transformers and
power supply units incorporating safety isolating transformers (IEC 61558-2-6)
EN ISO 11446, Road vehicles – Connectors for the electrical connection of towing and towed vehicles –
13-pole connectors for vehicles with 12 V nominal supply voltage (ISO 11446)
HD 22 (all parts), Cables of rated voltages up to and including 450/750 V and having cross-linked
insulation
ISO 1724, Road vehicles – Connectors for the electrical connection of towing and towed vehicles – 7-pole
connector type 12 N (normal) for vehicles with 12 V nominal supply voltage
ISO 3732, Road vehicles – Connectors for the electrical connection of towing and towed vehicles – 7-pole
connector type 12 S (supplementary) for vehicles with 12 V nominal supply voltage
ISO 6309, Fire protection – Safety signs
ISO 8820, Road vehicles – Fuse-links
721.3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
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  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
a factory produced relocatable dwelling
721.31 Purposes, supplies and structure
721.313 Supplies
721.313.1.2 The nominal supply system voltage shall be selected from HD 472 S1:1989 + Corr. 2002.
The nominal a.c. supply voltage of the installation of the caravan shall not exceed 230 V single-phase, or
400 V three-phase.
The nominal d.c. supply voltage of the installation of the caravan shall not exceed 48 V.

721.4 Protection for safety
721.41 Protection against electric shock
721.411.2 Requirements for basic protection
721.41.B.2 Obstacles
Protection by obstacles shall not be used.
721.41.B.3 Placing out of reach
Protection by placing out of reach shall not be used.
721.41.C.1 Non-conducting locations
Protection by non-conducting location shall not be used.
NOTE  This precludes the use of class 0 equipment.
721.41.C.2 Protection by earth-free local equipotential bonding
Protection by earth-free equipotential bonding shall not be used.
721.411.3.1.2 Protective equipotential bonding
Structural metallic parts that are accessible from within the caravan shall be bonded to the protective
conductor.
721.413 Protective measure: electrical separation
Protection by 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 d.c. power sources, the following standard voltages are generally applicable: 12 V,
24 V, 42 V and 48 V.
In exceptional cases, when a.c. extra-low voltage is required, the following standard voltages (rms) are
permitted: 12 V, 24 V, 42 V and 48 V.
NOTE  The requirements of Part 721 are also applicable to extra low-voltage d.c. installation. See Annex B for recommendations
that may be applied in addition.
721.415.1 Additional protection: residual current protective devices
Add:
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 EN 60947-2, EN 61008-1 or EN 61009-1
breaking all live conductors, shall be provided having the characteristics specified in 415.1.1.
Each supply inlet shall be directly connected to its associated RCD.
NOTE  This implies that there may not be any taps or junctions in the circuit.
721.43 Protection against overcurrent
721.43.1 Final circuits
Each final circuit shall be protected by an overcurrent protective device which disconnects all live
conductors of that circuit.
– 7 – HD 60364-7-721:2009
721.5 Selection and erection of equipment
721.51 Common rules
721.510 Introduction
721.510.3 General
Where there is more than one electrically independent installation, each independent installation shall be
supplied by a separate connecting device and shall be segregated in accordance with general rules.
721.512 Operational conditions and external influences
721.512.2 External influences
NOTE  Consideration should be given to the foreseeable external influences to which the caravan will be subjected.
721.514 Identification
721.514.1 General
Instructions for use shall be provided with the caravan so that the caravan can be used safely.
The instructions shall comprise:
– a description of the installation;
– a description of the function of the RCD(s) and the use of the test button;
– a description of the function of the main isolating switch;
– the text of the instructions of Annex A.
If it is necessary to take precautions during user maintenance, appropriate details shall be given.
721.521 Types of wiring systems
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 conduit or trunking system;
b) insulated single-core cables, with stranded class 2 conductors (minimum of 7 strands); in conduit or
trunking system;
c) sheathed flexible cab
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