IEC 60364-7-753:2014

Low-voltage electrical installations - Part 7-753: Requirements for special installations or locations - Heating cables and embedded heating systems

IEC 60364-7-753:2014 applies to embedded electric heating systems for surface heating. It also applies to electric heating systems for de-icing or frost prevention or similar applications. Both indoor and outdoor systems are covered. Heating systems for industrial and commercial applications complying with relevant parts of IEC 60519, IEC 62395 and IEC 60079 are not covered. This second edition cancels and replaces the first edition published in 2005 and constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
- the title has been changed from "Floor and ceiling heating systems" to "Heating cables and embedded heating systems" to align with the revised scope;
- the scope has been extended and now covers embedded electric heating systems for surface heating, also electric heating systems for de-icing or frost prevention or similar applications, and covers both indoor and outdoor systems. This includes heating systems for: walls, ceiling, floors, roofs, drainpipes, gutters, pipes, stairs, roadways, non-hardened compacted areas (e.g. football fields, lawns);
- for wall heating systems, this standard contains additional requirements (e.g. metal sheath/enclosure/grid) to protect against the effects of overheating caused by a short-circuit between live conductors due to penetration of an embedded heating unit;
- from heating units delivered from the manufacturer without exposed-conductive-parts, this standard requires a metallic mesh grid covering. This has been reduced to 3 mm for wall heating systems;
- this standard now requires that electric heating systems shall be selected and erected so as to avoid any harmful influence between the heating system and any electrical or non-electrical installations envisaged;
- and this standard covers surface temperatures and now refers the reader to the appropriate IEC guide.

Installations électriques à basse tension - Partie 7-753: Exigences pour les installations ou emplacements spéciaux - Câbles chauffants et systèmes de chauffage intégrés

L'IEC 60364-7-753:2014 s'applique aux systèmes de chauffage électriques intégrés pour le chauffage de surface. Elle s'applique aussi aux systèmes de chauffage électriques pour le dégivrage ou la prévention du gel ou pour des applications analogues. Les systèmes tant intérieurs qu'extérieurs sont couverts. Les systèmes de chauffage pour les applications industrielles et commerciales conformes aux parties applicables des normes IEC 60519, IEC 62395 et IEC 60079 ne sont pas couverts. Cette deuxième édition annule et remplace la première édition parue en 2005 et constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
- le titre a été modifié de "Systèmes de chauffage par sol ou plafond" en "Câbles chauffants et systèmes de chauffage intégrés" pour être en cohérence avec le nouveau domaine d'application;
- le domaine d'application a été étendu et couvre maintenant les systèmes de chauffage électrique intégrés pour le chauffage de surfaces, les systèmes de chauffage électrique pour le dégivrage ou la prévention du gel ou des applications similaires, et couvre à la fois les systèmes intérieurs et extérieurs. Ceci inclut les systèmes pour: murs, plafonds, sols, toits, tuyaux d'évacuation, gouttières, tuyaux, escaliers, chaussées, zones compactées meubles (par exemple terrains de football, pelouses);
- pour les systèmes de chauffage installés dans les murs, la présente norme contient des exigences supplémentaires (par exemple gaine/enveloppe/grillage métallique) pour la protection contre les échauffements dus à un court-circuit entre conducteurs actifs pénétrant dans l'unité de chauffage intégré;
- pour les unités de chauffage fournies par le constructeur sans masse, la présente norme exige un recouvrement par un grillage métallique. Celui-ci a été réduit à 3 mm pour les systèmes de chauffage installés dans les murs;
- la présente norme exige maintenant que les systèmes de chauffage électrique soient choisis et mis en oeuvre de manière à éviter toute influence dommageable entre le système de chauffage et toute installation électrique ou non-électrique prévue;
- et la présente norme traite des températures de surface et renvoie maintenant le lecteur au guide approprié de l'IEC.

General Information

• Status: Published
• Publication Date: 06-May-2014
• ICS: 91.140.50 - Electricity supply systems
• Technical Committee: TC 64 - Electrical installations and protection against electric shock
• Drafting Committee: MT 2 - TC 64/MT 2
• Current Stage: PPUB - Publication issued
• Start Date: 07-May-2014
• Completion Date: 15-Jun-2014

Relations

• Revises: IEC 60364-7-753:2005 - Low-voltage electrical installations - Part 7-753: Requirements for special installations or locations - Floor and ceiling heating systems
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 60364-7-753 ®
Edition 2.0 2014-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Low-voltage electrical installations –
Part 7-753: Requirements for special installations or locations – Heating cables
and embedded heating systems
Installations électriques à basse tension –
Partie 7-753: Exigences pour les installations ou emplacements spéciaux –
Câbles chauffants et systèmes de chauffage intégrés

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IEC 60364-7-753 ®
Edition 2.0 2014-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Low-voltage electrical installations –

Part 7-753: Requirements for special installations or locations – Heating cables

and embedded heating systems
Installations électriques à basse tension –

Partie 7-753: Exigences pour les installations ou emplacements spéciaux –

Câbles chauffants et systèmes de chauffage intégrés

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX M
ICS 91.140.50 ISBN 978-2-8322-1573-9

– 2 – IEC 60364-7-753:2014 © IEC 2014
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
753 Heating cables and embedded heating systems. 6
753.1 Scope . 6
753.2 Normative references . 6
753.3 Terms and definitions . 6
753.4 Protection for safety . 7
753.41 Protection against electric shock . 7
753.411 Automatic disconnection of supply . 8
753.413 Protective measure: electrical separation . 8
753.42 Protection against thermal effects . 8
753.423 Protection against burns . 8
753.424 Protection against overheating . 8
753.5 Selection and erection of electrical equipment . 9
753.51 Common rules . 9
753.511 Compliance with standards . 9
753.514 Identification . 9
753.515 Prevention of mutual detrimental influences . 9
753.52 Wiring systems . 10
753.520 Introduction . 10
753.522 Selection and erection of wiring systems in relation to external
influences . 10
Annex A (normative) Information for the user of the installation . 11
Annex B (informative) List of notes concerning certain countries. 12
Bibliography . 13

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
LOW-VOLTAGE ELECTRICAL INSTALLATIONS –

Part 7-753: Requirements for special installations or locations –
Heating cables and embedded heating systems

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
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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 60364-7-753 has been prepared by IEC technical committee 64:
Electrical installations and protection against electric shock.
This second edition cancels and replaces the first edition published in 2005 and constitutes a
technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) The title has been changed from "Floor and ceiling heating systems" to "Heating cables
and embedded heating systems" to align with the revised scope.
b) The scope has been extended and now covers embedded electric heating systems for
surface heating, also electric heating systems for de-icing or frost prevention or similar
applications, and covers both indoor and outdoor systems. This includes heating systems

– 4 – IEC 60364-7-753:2014 © IEC 2014
for: walls, ceiling, floors, roofs, drainpipes, gutters, pipes, stairs, roadways, non-hardened
compacted areas (e.g. football fields, lawns).
c) For wall heating systems, this standard contains additional requirements (e.g. metal
sheath/enclosure/grid) to protect against the effects of overheating caused by a short-
circuit between live conductors due to penetration of an embedded heating unit.
d) From heating units delivered from the manufacturer without exposed-conductive-parts, this
standard requires a metallic mesh grid covering. This has been reduced to 3 mm for wall
heating systems.
e) This standard now requires that electric heating systems shall be selected and erected so
as to avoid any harmful influence between the heating system and any electrical or non-
electrical installations envisaged.
f) This standard covers surface temperatures and now refers the reader to the appropriate
IEC guide.
The text of this standard is based on the following documents:
FDIS Report on voting
64/1916FDIS 64/1954/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication 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 committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC website under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
INTRODUCTION
For the purpose of this part (IEC 60364-7-753) 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 753.101, 753.102, 753.103 etc.
NOTE 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 753 part may no longer align with the latest
edition of the general part. Dated references should be observed.

– 6 – IEC 60364-7-753:2014 © IEC 2014
LOW-VOLTAGE ELECTRICAL INSTALLATIONS –

Part 7-753: Requirements for special installations or locations –
Heating cables and embedded heating systems

753 Heating cables and embedded heating systems
753.1 Scope
This part of IEC 60364 applies to embedded electric heating systems for surface heating. It
also applies to electric heating systems for de-icing or frost prevention or similar applications.
Both indoor and outdoor systems are covered.
Heating systems for industrial and commercial applications complying with relevant parts of
IEC 60519, IEC 62395 and IEC 60079 are not covered.
NOTE Examples of heating systems covered by this standard are heating systems for walls, ceilings, floors, roofs,
drainpipes, gutters, pipes, stairs, roadways, non-hardened compacted areas (e.g. football fields, lawns).
753.2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and
are indispensable for its application. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 60079-7, Explosive atmospheres – Part 7: Equipment protection by increased safety “e”
IEC 60335-2-96, Household and similar electrical appliances – Safety – Part 2-96: Particular
requirements for flexible sheet heating elements for room heating
IEC 60364 (all parts), Low-voltage electrical installations
IEC 60364-4-41:2005, Low-voltage electrical installations – Part 4-41: Protection for safety –
Protection against electric shock
IEC 60364-4-42, Low-voltage electrical installations – Part 4-42: Protection for safety –
Protection against thermal effects
IEC 60800, Heating cables with a rated voltage of 300/500 V for comfort heating and
prevention of ice formation
753.3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
753.3.1
thermal storage floor heating system
heating system in which, due to a limited charging period, a restricted availability of electrical
energy is converted into heat and dissipated mainly through the surface of the floor to the
room to be heated with an intended time delay

753.3.2
direct heating system
heating system which generates heat from electrical energy and dissipates it to the room to
be heated with a response time being as low as possible
753.3.3
complementary floor heating
direct heating system integrated into the floor construction, for example, in the border zones
close to outer walls, which complements the heat dissipation of a thermal storage floor
heating system
753.3.4
heating-free area
area of a surface that is deliberately left free of all parts of the heating system
753.3.5
heating cable
cable with or without a shield or a metallic sheath, intended to give off heat for heating
purposes
753.3.6
flexible sheet heating element
heating element consisting of sheets of electrical insulation laminated with electrical
resistance material, or a base material on which electrically insulated heating wires are fixed
753.3.7
heating unit
heating cable or flexible sheet heating element with rigidly fixed cold leads or terminal fittings
which are connected to the terminals of the electrical installation
753.3.8
cold lead
insulated cable or cord intended to connect the heating unit with the electrical installation
753.3.9
self-limiting heating cable
cable that cannot exceed 70 °C when tested according to IEC 60079-7 and which does not
require cold leads for connection to the electrical installation
753.4 Protection for safety
753.41 Protection against electric shock
753.410.3.5 Protection by obstacles and placing out of reach
Replace the requirements with the following:
The protective measures "obstacles" and "placing out of reach" as specified in Annex 41B of
IEC 60364-4-41: 2005, shall not be used.
753.410.3.6
Replace the requirements with the following:
The protective measures "protection by non-conducting location", "protection by earth-free
local equipotential bonding" and "protection by electrical separation for the supply of more
than one item of current-using equipment" as specified in Annex 41C of IEC 60364-4-41:2005,
shall not be used.
– 8 – IEC 60364-7-753:2014 © IEC 2014
753.411 Automatic disconnection of supply
753.411.1 General
Add the following paragraph:
In the case of heating units which are delivered from the manufacturer without an earthed
conductive shield a suitable conductive covering, for example, a mesh metallic grid, with a
mesh size of not more than 30 mm for ceilings and floor installations and 3 mm for wall
installations, shall be provided on site and connected to the protective conductor of the
electrical installation.
Residual current protective devices shall be so selected, and the electrical circuits so
subdivided, that any earth-leakage current which may be expected to occur during normal
operation of the connected load(s) will be unlikely to cause unnecessary tripping of the device.
753.413 Protective measure: electrical separation
Add the following:
Electrical separation is not permitted for wall heating systems.
753.415.1 Additional protection: residual current protective devices (RCDs)
753.415.1.1
Add, at the end of 415.1.1 of IEC 60364-4-41 the following new paragraph:
Circuits supplying heating units shall have additional protection by the use of RCDs with a
rated residual operating current not exceeding 30 mA. Time delayed type RCDs are not
permitted.
753.42 Protection against thermal effects
753.423 Protection against burns
Add the following:
Where contact with the skin or footwear is possible, the surface temperature shall be limited.
NOTE Guidance on limitation of temperature is given in IEC Guide 117.
753.424 Protection against overheating
Add the following:
753.424.101 Wall heating systems
For wall heating systems the heating units shall be provided with a metal sheath or metal
enclosure or fine mesh metallic grid. The metal sheath or metal enclosure or fine mesh
metallic grid shall be connected to the protective conductor of the supply circuit.
NOTE This requirement is intended to protect against the effects of overheating caused by a short-circuit between
live conductors due to penetration of an embedded heating unit.
753.424.102 To meet the requirements of IEC 60364-4-42, special care shall be taken to
prevent the heating elements creating high temperatures to adjacent material. This may be
achieved by using heating units with temperature self-limiting functions or by separation with
heat-resistant materials. The latter may be accomplished by placing on a metal sheet, in
metal conduit or at a distance of at least 10 mm in air from the ignitable structure.

753.5 Selection and erection of electrical equipment
753.51 Common rules
753.511 Compliance with standards
Add the following:
Flexible sheet heating elements shall comply with the requirements of IEC 60335-2-96.
Heating cables shall comply with IEC 60800.
753.514 Identification
753.514.1 General
Replace the existing text by the following new text:
Documentation for each heating system shall be provided, containing the following information
where relevant:
– manufacturer and type of heating units;
– number of heating units installed;
– length/area of heating units;
– rated power;
– surface power density;
– layout of the heating units in the form of a sketch, drawing or picture;
– position/depth of heating units;
– position of junction boxes;
– conductors, shields and the like;
– heated area;
– rated voltage;
– rated resistance (cold) of heating units;
– rated current of overcurrent protective device;
– rated residual operating current of RCD;
– the insulation resistance of the heating installation and the test voltage used;
– the leakage capacitance;
– product information containing provisions about approved substances in the surroundings
of the heating units, with necessary instructions for installation. If materials other than
those recommended are used, the manufacturer shall be consulted.
This plan shall be fixed to, or adjacent to, the distribution board of the heating system.
Furthermore, the requirements of Annex A apply.
753.515 Prevention of mutual detrimental influences
753.515.1
Replace the existing text by the following new text:
Electric heating systems shall be selected and erected so as to avoid any harmful influence
between the heating system and any electrical or non-electrical installations envisaged.

– 10 – IEC 60364-7-753:2014 © IEC 2014
NOTE For example, an electric heating system can affect other parts of the electrical installation such as reducing
the current-carrying capacity of cables of other circuits due to high local ambient temperature caused by the
heating system.
Add the following new subclause:
753.515.101 Heating units shall not cross expansion joints of the building or structure.
753.52 Wiring systems
753.520 Introduction
753.520.4 General
Add the following new subclause:
753.520.4.101 Heating-free areas
For the necessary attachment of room fittings, heating-free areas shall be provided in such a
way that the heat emission is not prevented by such fittings.
753.522 Selection and erection of wiring systems in relation to external influences
753.522.1 Ambient temperature (AA)
Add the following:
753.522.1.3 For cold leads (circuit wiring) and control leads installed in the zone of heated
surfaces, the increase of ambient temperature shall be taken into account.
753.522.4 Presence of solid foreign bodies (AE)
Add the following:
753.522.4.3 Where heating units are installed there shall be heating-free areas where
drilling and fixing by screws and the like may be carried out without risk of damage to the
unit(s).
Annex A
(normative)
Information for the user of the installation

A description of the heating system shall be provided to the person ordering the work upon
completion of the installation.
The description shall contain at least the following information:
a) description of the construction of the heating system, especially the installation depth of
the heating units;
b) location diagram with information concerning
– the distribution of the heating circuits and their rated power,
– the position of the heating units in each room,
– particularities which have been taken into account when installing the heating units, for
example heating-free areas, complementary heating zones, heating-free areas for
fixing means penetrating into the covering material;
c) data on the control equipment used, with relevant circuit diagrams and the dimensioned
position of floor temperature and weather conditions sensors, if any;
d) data on the type of heating units and their maximum operating temperature.
The installer shall inform the owner that the description of the heating system includes all
necessary information, for example for repair work.
An appropriate number of instructions for use shall be provided to the owner or his agent
upon completion. One copy of the instructions for use shall be permanently fixed in or near
each relevant distribution board.
The instructions for use shall include at least the following data:
– description of the heating system and its function;
– operation of the heating installation in the first heating period in the case of a new building,
for example, regarding drying out;
– operation of the control equipment for the heating system in the dwelling area and in the
complementary heating zones, if any;
– information on restrictions on placing of furniture or similar:
• additional floor coverings, for example, carpets with a thickness of >10 mm may lead
to higher floor temperatures which can adversely affect the performance of the heating
system;
• pieces of furniture solidly covering the floor and/or built-in cupboards shall only be
placed on heating-free areas,
• furniture, such as carpets, seating and rest furniture with pelmets, which in part do not
solidly cover the floor may not be placed in complementary heating zones, if any;
– in the case of ceiling heating systems, restrictions regarding the height of furniture.
Cupboards of room height may be placed only below the area of ceiling where no heating
elements are installed;
– dimensioned position of complementary heating zones and placing areas;
– statement that, in the case of thermal floor, wall and ceiling heating systems, no fixing
shall be made into the floor, wall or ceiling, respectively. Excluded from this requirement
are heating-free areas.Alternatives shall be given, where applicable.

– 12 – IEC 60364-7-753:2014 © IEC 2014
Annex B
(informative)
List of notes concerning certain countries

Country Clause N° Text
Austria 753.411.1, In Austria, the following additional requirements apply:
first paragraph
In the case of heating units which are delivered from the manufacturer without an
earthed conductive shield a suitable conductive covering, for example, a mesh
metallic grid, with an mesh size not more than 3 mm for ceilings, floor and wall
installations, shall be provided on site and connected to the protective conductor of
the electrical installation.
Norway 753.415.1.1 In Norway, the following additional requirements apply:
In Norway, circuits supplying heating units galvanic connected to a public IT
distribution network, the rated residual operating current of the RCDs may be
selected to be less or equal to 30 mA above the le
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