SIST HD 60364-5-52:2011/A12:2023

Low-voltage electrical installations - Part 5-52: Selection and erection of electrical equipment - Wiring systems

IEC 60364-5-52:2009 deals with the selection and erection of wiring systems. This third edition cancels and replaces the second edition, published in 2001, and constitutes a technical revision. The main changes with respect to the previous edition are as follows:  - Subclause 521.4 introduces minor changes with regard to busbar trunking systems and powertrack systems.  - Subclause 523.6 introduces minor changes with regard to the sizing of cables where harmonic currents are present.  - A new sublause 523.9  concerning single-core cables with a metallic covering has been introduced.  - Clause 525 introduces changes in the maximum value of voltage drop permitted between the origin of the consumer's installation and the equipment which should not be greater than that given in the relevant annex.  - Clause 526 introduces minor changes to electrical connections including additional exceptions for inspection of connections and additional notes.  - Clause 528 introduces additional requirements with regard to proximity of underground power and telecommunication cables.  - Clause 529 introduces minor changes to selection and erection of wiring systems in relation to maintainability, including cleaning.

Errichten von Niederspannungsanlagen - Teil 5-52: Auswahl und Errichtung elektrischer Betriebsmittel - Kabel- und Leitungsanlagen

Installations électriques à basse-tension - Partie 5-52: Choix et mise en oeuvre des matériels électriques - Canalisations

Nizkonapetostne električne inštalacije - 5-52. del: Izbira in namestitev električne opreme - Inštalacijski sistemi - Dopolnilo A12

General Information

• Status: Published
• Publication Date: 01-Dec-2022
• ICS: 13.260 - Protection against electric shock. Live working
• ICS: 91.140.50 - Electricity supply systems
• Technical Committee: ELI - Electrical and communication installations
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Dec-2022
• Due Date: 05-Feb-2023
• Completion Date: 02-Dec-2022
• Ref Project: HD 60364-5-52:2011/A12:2022 - Low-voltage electrical installations - Part 5-52: Selection and erection of electrical equipment - Wiring systems

Relations

• Amends: SIST HD 60364-5-52:2011 - Low-voltage electrical installations -- Part 5-52: Selection and erection of electrical equipment - Wiring systems
• Effective Date: 01-Jan-2023

Overview

HD 60364-5-52:2011/A12:2022 (CLC) is a harmonization amendment to the European adoption of IEC 60364‑5‑52 covering the selection and erection of wiring systems for low‑voltage electrical installations. It updates rules for cables, conduits, trunking and related wiring practices, with a strong emphasis on fire performance (in line with the EU Construction Products Regulation - CPR) and practical installation requirements.

Key topics and technical requirements

• Wiring system selection and erection: Guidance on conduits, cable trunking, cable ducts, cable trays and acceptable installation methods.
• Reaction-to-fire classification (CPR / EN 13501-6): Cables must be selected with EN 13501‑6 classes in mind; minimum recommendations (e.g., Class E) and higher classes (C‑s1,d2,a1 or B2‑s1,d2,a1) for higher fire risk installations are addressed. References to EN 50575 for CPR performance declaration are included.
• Fire behaviour and mitigation: Revisions to Clause 527 clarify limits on flame‑propagating cables, installation limits for non-compliant cables, and notes on smoke emission and continuity of service during fire.
• Busbar trunking and powertrack systems: Minor changes in requirements for busbar trunking (subclause 521.4).
• Cable sizing with harmonics: Subclause 523.6 updates sizing considerations where harmonic currents are present.
• Single‑core metallic covering: New subclause 523.9 addressing single‑core cables with metallic covering.
• Voltage drop: Clause 525 revises permitted maximum voltage drop from origin to equipment and refers to relevant annex values.
• Electrical connections and inspection: Clause 526 introduces changes, exceptions for inspection and additional notes on connections.
• Underground proximity: Clause 528 adds requirements for the proximity of underground power and telecommunication cables.
• Maintainability and cleaning: Clause 529 clarifies selection/erection rules to improve maintainability, including cleaning considerations.
• National deviations and implementation: Annexes ZA/ZB/ZC list normative references and special national conditions (CENELEC national committees must implement or adopt).

Practical applications

• Design and installation of low‑voltage wiring in residential, commercial and industrial buildings where compliance with European wiring safety, fire performance and installation practice is required.
• Specifying cable types and fire‑performance classes for building works to ensure conformity with the CPR and national building regulations.
• Determining cable routing, voltage‑drop limits, and conductor sizing in installations subject to harmonic loads.
• Coordinating installation rules where underground utilities or complex trunking/busbar systems are involved.

Who uses this standard

• Electrical designers, consulting engineers and specifiers
• Installation contractors and electricians
• Building safety engineers and facility managers
• Electrical inspectors, certification bodies and regulators
• Cable manufacturers and product conformity assessors (for CPR/EN 50575 compliance)

Related standards (key references)

• IEC 60364‑5‑52 / HD 60364‑5‑52 (base document)
• EN 13501‑6 (fire classification of electric cables)
• EN 50575 (CPR for power, control and communication cables)
• EN 60332‑1‑2 (non‑flame propagating test)

Keywords: HD 60364-5-52:2011/A12:2022, wiring systems, low‑voltage electrical installations, selection and erection, cable fire classification, CPR, EN 13501-6, EN 50575, voltage drop, busbar trunking, harmonic currents.

Standards Content (Sample)

SLOVENSKI STANDARD
01-januar-2023
Nizkonapetostne električne inštalacije - 5-52. del: Izbira in namestitev električne
opreme - Inštalacijski sistemi - Dopolnilo A12
Low-voltage electrical installations - Part 5-52: Selection and erection of electrical
equipment - Wiring systems
Errichten von Niederspannungsanlagen - Teil 5-52: Auswahl und Errichtung elektrischer
Betriebsmittel - Kabel- und Leitungsanlagen
Installations électriques à basse-tension - Partie 5-52: Choix et mise en oeuvre des
matériels électriques - Canalisations
Ta slovenski standard je istoveten z: HD 60364-5-52:2011/A12:2022
ICS:
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 60364-5-52:2011/A12

DOCUMENT D'HARMONISATION
HARMONISIERUNGSDOKUMENT November 2022
ICS 13.260; 91.140.50
English Version
Low-voltage electrical installations - Part 5-52: Selection and
erection of electrical equipment - Wiring systems
Installations électriques à basse-tension - Partie 5-52: Errichten von Niederspannungsanlagen - Teil 5-52:
Choix et mise en oeuvre des matériels électriques - Auswahl und Errichtung elektrischer Betriebsmittel - Kabel-
Canalisations und Leitungsanlagen
This amendment A12 modifies the Harmonization Document HD 60364-5-52:2011; it was approved by CENELEC on 2022-07-18.
CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for implementation of
this amendment 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 amendment 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye 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
© 2022 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. HD 60364-5-52:2011/A12:2022 E

Contents Page
European foreword . 2
1 Addition to “Foreword” . 3
2 Additions to 520.1, “Scope” . 3
3 Additions to 520.2, “Normative references” . 3
4 Modifications to Clause 527, “Selection and erection of wiring systems to minimize the
spread of fire” . 3
5 Addition to normative Annex ZA, “Normative references to international publications with
their corresponding European publications” . 4
6 Additions to Annex ZB, “Special National Conditions” . 4
7 Additions to Annex ZC, “A-Deviations” . 17
8 Modifications to the “Bibliography” . 18
European foreword
This document (HD 60364-5-52:2011/A12:2022) has been prepared by CLC/TC 64 “Electrical installations and
protection against electric shock”.
The following dates are fixed:
• latest date by which this document has to be (dop) 2023-05-25
implemented at national level by publication of
an identical national standard or by
endorsement
• latest date by which the national standards (dow) 2025-11-25
conflicting with this document have to be
withdrawn
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.
Any feedback and questions on this document should be directed to the users’ national committee. A complete
listing of these bodies can be found on the CENELEC website.
1 Addition to “Foreword”
Add the following after the end of the 3rd paragraph:
“The main changes with respect to the previous edition are listed below:
– For cables, the provisions of the Construction Products Regulation ((EU) No. 305/2011 (CPR)) came fully
into force on 1 July 2017 in respect of Reaction to Fire. These requirements are now expressed by reference
to the relevant Classes according to EN 13501-6.
NOTE The CPR harmonises the methods of assessment and test, the means of declaration of product performance
and the system of conformity assessment of construction products, but NOT national building regulations. The choice of
required classes for the particular intended use is left to the regulators and public / private sector procurers at the national
level. However, it is essential that such required classes are expressed in a consistent manner (technical language) as used
in the harmonized technical specifications.”
2 Additions to 520.1, “Scope”
Add the following after NOTE 2:
“Requirements for the selection of cables with respect to the classification provided in EN 13501-1 on reaction
to fire in order to comply with the Construction Products Regulation (CPR) of the EU are also provided.
NOTE 3 Whilst the CPR requires the manufacturer to declare the reaction to fire performance of the cable in accordance
with procedures and classification that are common across the EU, it is the responsibility of the Member State to determine
which class according to EN 13501-6 is required for any particular application or installation. National statutory requirements
could therefore override the classes required by this publication.”
3 Additions to 520.2, “Normative references”
Add the following reference:
“EN 13501-6, Fire classification of construction products and building elements - Part 6: Classification using
data from reaction to fire tests on electric cables”
4 Modifications to Clause 527, “Selection and erection of wiring systems to
minimize the spread of fire”
Add the following note at the end of Clause 527.1.1:
“
NOTE Fire hazards can be limited by appropriate selection of insulated conductors and cables providing improved
behaviour in case of fire. Such products can limit the fire propagation, can offer lower smoke emission and can, in case of
fire, even provide a continuous service of important functions for a certain period of time.
To limit the fire hazard by applying insulated conductors and cables with improved fire behaviour is especially important for
installations where a particular risk of fire is identified as described in BD2, BD3 and BD4 of HD 60364-5-51.
All cables permanently installed in Construction Work, are expected to comply with the European Construction Product
Regulation (CPR) which requests to inform about the fire performance of insulated conductors and cables by only referring
to classes as defined in EN 13501-6, and comply with the provisions of EN 50575.”
Replace the entire text of 527.1.3 with the following:
“527.1.3  Cables complying with, at least, the requirements of Class E as defined in EN 13501-6 and
ca
products classified as non-flame propagating according to Clause 527.1.5 may be installed without special
precautions.
NOTE In installations where particular risk of fire is identified, cables complying with class C -s1,d2,a1 or
ca
B2 - s1,d2,a1 as defined in EN 13501-6 could be necessary. See also 422.2.1.”
ca
Replace the entire text of 527.1.4 with the following:
“527.1.4  Cables not complying, as a minimum, with the requirements of EN 60332-1-2 or class E shall, if
ca
used, be limited to short lengths for connection of appliances to permanent wiring systems and shall, in any
event, not pass from one fire-segregated compartment to another.”
5 Addition to normative Annex ZA, “Normative references to international
publications with their corresponding European publications”
Add the following new reference to the table at the appropriate place:
“Publication Year Title EN/HD Year
- - Fire classification of construction products EN 13501-6 -
and building elements - Part 6:
Classification using data from reaction to
fire tests on power, control and
communication cables
“
6 Additions to Annex ZB, “Special National Conditions”
Add the following entries to the table on Special National Conditions:
“
Country Clause Special national condition
IT  In Italy this part is covered by the Amendment 4 to Italian Standard
CEI 64-8 and Part 751 of CEI 64-8
IE 527 In Ireland, The National Rules for Electrical Installations require that
all cables in buildings are minimum D -s2,d2,a2 in accordance with
ca
EN 50575.
AT 527.1.3 In Austria, for wiring there are special conditions established by
federal state authorities on the basis of the “OIB-Richtlinie 2 –
Brandschutz.
GB 527.1.3 In the UK the provisions of BS 7671 apply.
AT 527.1.4 In Austria, for wiring there are special conditions established by
federal state authorities on the basis of the “OIB-Richtlinie 2 –
Brandschutz.
DK Table C.52.3 Extension of an existing installation carried out under previous
national regulations applicable before 1 July 2019.
When an existing installation is extended with one new circuit, it is
permitted that no correction for groups be made to the current-
carrying capacity of the new circuit, and that the impact of the new
circuit on the existing circuits be neglected if all of the following
criteria are met:
—  The new circuit has a conductor cross-sectional area of max.
4 mm ;
—  The new circuit has a design load of max. 16 A;
Country Clause Special national condition
—  The new circuit is expected to carry a current not exceeding
70 % of the current-carrying capacities listed in Table C.52.1
or Table C.52.2 multiplied by any correction factor for the
ambient temperature (other than 30 °C);
—  The new circuit is not charged maximally for a period longer
than 3 h at a time.
“
In the table on Special National Conditions, replace the Special National Conditions for Germany with the
following:
“
Country Clause Special national condition
DE 520.3 Add new definition:
520.3.3
main circuit
circuit containing electrical equipment for generation, conversion, distribution or
switching of electrical power or current-using equipment
[IEC 60364-5-55 Ed. 2.2:2016-07, 557.2.2]

521.6 Amend text as follows:
Several circuits are allowed in the same conduit system, separated compartment of
cable ducting system or cable trunking system provided all conductors are
insulated for the highest nominal voltage present and the conduit system,
separated compartment of cable ducting system or cable trunking system
have a suitable cross-section.
Conduit systems shall comply with the EN 61386 series, cable trunking or ducting
systems shall comply with EN 50085 series and cable tray and cable ladder
systems shall comply with EN 61537.
NOTE Guidance on the selection of conduit systems is given in Annex F.
For installation of non-metallic conduits in free air conduits with resistance to
UV radiation shall be selected.
For installations where halogene-free material is required, non-metallic
conduit systems, cable ducting systems and cable trunking systems shall
comply with EN 50642.
For the installation of conduits in concrete the resistance to compression as
required in DIN EN 61386-1 (VDE 0605-1) has to be considered to enable the
introduction and the exchange of cables without damage after the installation
of the conduits.
Following this, the conduits shall comply with medium or high resistance to
compression and the bending behavior shall be rigid or bendable according
to DIN EN 61386-22 (VDE 0605-22).
Conduits in compliance with DIN EN 61386-24 (VDE 0605-24) classified with
N750 may be installed in or passing through concrete.
In the case of basic-insulated conductors in conduit systems, cable trunking
systems and cable ducting systems, only the conductors of one main circuit
and the auxiliary circuits associated with this main circuit may be laid in a
conduit or a single-channel trunking or one duct of a multi-channel trunking,
except in electrical and closed electrical operating areas. The uncut
Country Clause Special national condition
conductors of several circuits may, however, be fed through common
looping-through boxes.
521.9.1 This clause is amended as follows:
A flexible cable may be used for fixed wiring where the provisions of this standard
and EN 50565-2 or DIN VDE 0298-3 (VDE 0298-3) are met.
Isolated flexible cores in compliance with EN 50565-2 or DIN VDE 0298-3 (VDE
0298-3) may also be used for fixed installation. In this case, 521.10.1 shall
also be considered.
521.9.5 Add new subclause:
521.9.5
Under certain circumstances, for ease of installation, the conductor may be Class 5
according to EN 60228, in which case the designatory suffix according to DIN VDE
0292 (VDE 0292) is given by "-K".
The use of a Class 5 conductor designated "-K" does not indicate that the cable is
suitable for repeated bending.
Flexible cables or cords should not be used as fixed wiring unless contained in an
enclosure affording mechanical protection, except when used as the final
connection to fixed equipment. In which case they should be of, at least, the
'ordinary' type. Heavy duty types may be used for fixed installations in temporary
buildings.
Flexible cables or cords should not be placed under carpets or other floor
coverings, where there is
a) any risk of thermal insulating effects, leading to excessive temperature rise (see
5.3.1, a));
b) any risk of damage due to furniture or equipment resting on them or traffic
passing over them.
When flexible cables are required for use outdoors, whether of temporary or
permanent usage, reference should be made to EN 50565-2 to determine their
suitability for such usage.
PVC flexible cables or cords are unsuitable for permanent use outdoors. Neither
should those that have a temporary designation be used in that manner outdoors in
adverse conditions, e. g. at temperatures below those given in EN 50565-2.
In the case of soft soldered joints or terminations the limiting temperature for the
◦
conductor under short circuit conditions is reduced to 160 C. Account of this
limitation should be taken in selecting and operating cables.
Tinned copper conductors should not be used at temperatures above 200 C
because of the risk of mutual adhesion.
Where the limiting temperature given in EN 50565-2 is such that the temperature of
the surface of the cable is liable to exceed 50 C, the cable should be so located or
guarded as to prevent contact of persons or animals therewith. Cable surface
temperatures above this can cause involuntary reaction in the event of contact with
exposed skin. Account should be taken of these possibilities in the selection and
use of cables.
521.10 This clause is separated in several subclauses as follows:
521.10.1 Cores
Insulated conductors (non-sheathed cores) for fixed wiring shall be enclosed in a
continuous
Country Clause Special national condition
— conduit system in compliance with EN 61386 series,
— cable ducting system in compliance with EN 50085 series,
— cable trunking system in compliance with EN 50085 series.
This requirement does not apply to a protective conductor complying with HD
60364-5-54.
521.10.2 Cables (Kabel)
Cables NYY or NYCWY according to DIN VDE 0276-603 (VDE 0276-603):2010
should have the following bending radii (see Part 5, Section 3G, Clause IV
“Recommendation for use”):
a) Permissible bending radius during installation:
— single-core cables: 15-fold cable diameter;
— multi-core cables: 12-fold cable diameter.
b) Reduction of bending radius by 50 % under the following conditions:
— single bending;
— professional installation;
— heating the cable up to 30 °C;
— bending the cable by using a template.
The distance between fixing means should be (see Part 5, Section 3G, Clause IV
“Recommendation for use”:
Horizontal distance between fixing means:
— 20 times the cable diameter
These distances also apply for supporting areas for wiring on cable racks, or
supporting structures. The distance shall not exceed 80 cm.
Vertical distance between fixing means:
— For vertical wiring along walls, the distances may be longer. However, distances
shall not exceed 1,5 m.
521.10.3 Cables (Leitungen)
In case of fixed installation, conductors shall have bending radii according to
Table 1 (see also EN 50565-1:2002, Table 3):
Table 1 — Minimum permissible bending radius for fixed installation

minimum bending radius for cable diameter D
mm
D ≤ 8 8 < D ≤ 12 12 < D ≤ 20 D > 20
cables with rigid Standard
4 5 6 6
application
conductors
Careful bending 2 3 4 4
cables with Fixed
3 3 4 4
installation
flexible
conductors Flexible
4 4 5 6
application
NOTE 1 The minimum permissible bending radius corresponds to the internal radius.
NOTE 2 Specifications apply for a cable temperature of (20 ± 10) °C.
NOTE 3 D corresponds to the outer diameter for round cables or the smaller external dimensions for flat cables.

The distance between fixing means should be according to Table 2 (see
EN 50565-1:2014, Table 1):
Table 2 — Maximum distance between fixing means
a b c
Outer diameter of cable Maximum distance
(mm) (mm)
Horizontal Vertical
250 400
D ≤ 9
300 400
9 < D ≤ 15
350 450
15 < D ≤ 20
d
400 550
20 < D ≤ 40
a
For flat cables this is taken as the measurement of the major axis.
b
The spacings stated for horizontal runs may also be applied to runs at an angle of more than 30° from the
vertical. For runs at an angle of 30° or less than the vertical, the vertical spacings are applicable.
c
The spacing stated in this table is a maximum. Reduced spacing may be required for various reasons, for
example, the fixing method used, vibration, weight of cable.
d
For the spacing of supports for cables of overall diameter exceeding 40 mm, and for single core cables having
conductors of cross-sectional area 300 mm and larger, the manufacturer’s recommendations shall be observed.

521.10.4 Sheathed cables (NYM)
These cables are intended for installation on, under and in plaster in dry, humid and
wet rooms as well as in masonry and concrete, except for direct embedding in
heaped, shaked or tamped concrete in compliance with DIN VDE 0298-3 (VDE 0298-
3). These cables are also suitable for use in open air, provided that they are protected
from direct exposure to sun light.
Table A.52.1 applies for the installation of sheathed conductors with the following
restriction:
Sheathed conductors according to DIN VDE 0250-210 (VDE 0250-210) may be
installed in underground protective conduits if the cables remain accessible and
exchangeable and the conduit is mechanically fixed, protected against the ingress of
liquids and ventilated.
This type of wiring should be restricted to exceptional cases with short distances. An
installation in compliance with 522.8.10 should be preferred.
521.10.5 Flat webbed house wires
Flat webbed house wires in accordance with DIN VDE 0250-201 (VDE 0250-201)
may be used if the following requirements are met:
a) Flat webbed house wires (NYIF, NYIFY) according to DIN VDE 0250-201 (VDE
0250-201) may only be installed in dry rooms and only in or under plaster. They shall
be covered with plaster along their entire length.
NOTE 1 The use of flat webbed house wires may be restricted in special specifications.
NOTE 2 The insulation of cores in flat conductors is about half as thick as the insulation of
single-core conductors. The covering is primarily intended to maintain the distances between
the cores in order to ensure the permissible heat removal based on the maximum carrying
current and the additional mechanical protection of the conductor by the plaster covering. In
general, this is ensured by a crack-resistant plaster covering with a plaster thickness of about
4 mm.
b) If flat webbed house wires are installed in cavities in ceilings or walls consisting of
concrete, stone or similar non-combustible material, it is not necessary to cover them
with plaster in accordance with item a).
c) Even when covered with plaster, flat webbed house wires may not be laid on
combustible construction materials (see DIN 4102-1), e. g. wood.
d) Flat webbed house wires shall not be bunched. Collecting flat webbed house wires
together at the inlet points of electrical equipment, e. g. distribution boards, is not
considered as bunching.
e) Flat webbed house wires may only be fixed using means and methods which will
ensure that the insulation is not damaged or deformed.
NOTE 3 Means for fixing without damage are, e.g.
— gypsum plaster; or
— clamps matching the shape of the wires and made of insulating material or of metal with
insulating layer; or
— sticking; or
— nailing with suitable nails with insulating washers.
f) Flat webbed house wires shall not be installed under plaster board unless these
boards are attached entirely with plaster.
g) Flat webbed house wires shall not be installed immediately on or under wire
netting, metal mesh or similar.
h) Flat webbed house wires may only be joined in installation boxes in accordance
with DIN EN 60670-1 (VDE 0606-1) made of insulating material.
521.10.6 Installation of overhead span lines
Overhead span lines shall be attached and fixed so that sag or movement do not
result in damage. The specifications for overhead lines in DIN VDE 0211 (VDE
0211):1985-12 are applicable to the height of span lines (e. g. for crossings of
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