SIST EN 50525-1:2011
Electric cables - Low voltage energy cables of rated voltages up to and including 450/750 V (U0/U) - Part 1: General requirements
Electric cables - Low voltage energy cables of rated voltages up to and including 450/750 V (U0/U) - Part 1: General requirements
This European Standard gives the general requirements for rigid and flexible energy cables of rated voltages U0/U up to and including 450/750 V a.c., used in power installations and with domestic and industrial appliances and equipment.
Kabel und Leitungen - Starkstromleitungen mit Nennspannungen bis 450/750 V (U0/U) - Teil 1: Allgemeine Anforderunge
Câbles électriques - Câbles d’énergie basse tension de tension assignée au plus égale à 450/750 V (U0/U) - Partie 1: Exigences générales
Električni kabli - Nizkonapetostni energetski kabli z nazivno napetostjo do vključno 450/750 V (U0/U) - 1. del: Splošne zahteve
Ta evropski standard podaja splošne zahteve za toge in zvijave energetske kable z nazivno napetostjo do in vključno 450/750 V (U0/U) izmeničnega toka, ki se uporabljajo v močnostnih inštalacijah in pri gospodinjskih ter industrijskih aparatih in opremi.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 50525-1:2011
01-julij-2011
(OHNWULþQLNDEOL1L]NRQDSHWRVWQLHQHUJHWVNLNDEOL]QD]LYQRQDSHWRVWMRGR
YNOMXþQR9 88 GHO 6SORãQH]DKWHYH
Electric cables - Low voltage energy cables of rated voltages up to and including 450/750
V (U0/U) - Part 1: General requirements
Kabel und Leitungen - Starkstromleitungen mit Nennspannungen bis 450/750 V (U0/U) -
Teil 1: Allgemeine Anforderunge
Câbles électriques - Câbles d’énergie basse tension de tension assignée au plus égale à
450/750 V (U0/U) - Partie 1: Exigences générales
Ta slovenski standard je istoveten z: EN 50525-1:2011
ICS:
29.060.20 Kabli Cables
SIST EN 50525-1:2011 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 50525-1:2011
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SIST EN 50525-1:2011
EUROPEAN STANDARD
EN 50525-1
NORME EUROPÉENNE
May 2011
EUROPÄISCHE NORM
ICS 29.060.20 Supersedes HD 21.1 S4:2002, HD 22.1 S4:2002
English version
Electric cables -
Low voltage energy cables of rated voltages up to and including
450/750 V (U /U) -
0
Part 1: General requirements
Câbles électriques - Kabel und Leitungen -
Câbles d’énergie basse tension deStarkstromleitungen mit
tension assignée au plus égale à Nennspannungen bis 450/750 V (U /U) -
0
450/750 V (U /U) - Teil 1: Allgemeine Anforderungen
0
Partie 1: Exigences générales
This European Standard was approved by CENELEC on 2011-01-17. CENELEC members are bound to
comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the Central Secretariat or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CENELEC member into its own language and
notified to the Central Secretariat has the same status as the official versions.
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, 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
Management Centre: Avenue Marnix 17, B - 1000 Brussels
© 2011 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
-
Ref. No. EN 50525-1:2011 E
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Foreword
This European Standard was prepared by the Technical Committee CENELEC TC 20, Electric
cables.
The text of the draft was submitted to the formal vote and was approved by CENELEC as
EN 50525-1 on 2011-01-17.
This document, which is one of a multipart series, supersedes HD 21.1 S4:2002 and
HD 22.1 S4:2002.
Attention is drawn to the possibility that some of the elements of this document may be the
subject of patent rights. CEN and CENELEC shall not be held responsible for identifying any
or all such patent rights.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2012-01-17
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2014-01-17
___________
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Contents
Page
Introduction . 5
1 Scop e . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Rated voltage . 7
5 Requirements for the construction of cables . 8
5.1 General . 8
5.2 Condu cto r s . 8
5.3 Insulation . 8
5.4 Core identification . 9
5.5 Assembly of cores . 10
5.6 Other components . 10
5.7 Sheath. 13
6 Marking . 15
6.1 Indication of origin . 15
6.2 Continuity of marking . 15
6.3 Use of the name CENELEC . 16
6.4 Code designation . 16
6.5 Additional voluntary marking . 16
6.6 Additional requirements . 16
7 Tests on completed cables . 16
7.1 General . 16
7.2 Electrical requirements . 16
7.3 Overall dimensions . 20
7.4 Mechanical strength of flexible cables . 20
7.5 Assessment of halogens . 20
8 Guide to use of the cables . 20
Annex A (normative) Mechanical tests – Requirements for flexible cables . 21
A.1 Two-pulley flexing test . 21
A.2 Wear resistance test . 21
A.3 Three-pulley test . 21
A.4 Kink test . 22
A.5 Test for separation of cores . 22
Annex B (normative) Assessment of halogens . 23
B.1 Requirements for extruded material . 23
B.2 Requirements for non-extruded materials . 24
Annex C (normative) Determination of halogens – Elemental test . 25
C.1 Equipment . 25
C.2 Materials . 25
C.3 Procedure . 26
Annex D (normative) Requirements for core identification of multicore cables
with more than five cores . 27
D.1 Core identification . 27
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D.2 Marking by inscription . 27
D.3 Colour coding (pilot and marker system) . 27
Annex E (informative) Structure and content of EN 50525 and its derivation from
HD 21 and HD 22. 28
Bibliography . 31
Tables
Table 1 – Requirements for electrical tests for cables . 18
Table B.1 – Test method, measurement, requirements . 23
Table B.2 – Sequential test programme . 24
Table E.1 – General structure of EN 50525 . 28
Table E.2 – Specific structure of EN 50525 and its derivation from HD 21 and HD 22 . 29
Table E.3 – Location of each part of HD 21 and HD 22 . 30
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Introduction
EN 50525 derives from CENELEC Harmonization Documents HD 21 and HD 22. It has the
following parts:
- Part 1: General requirements;
- Part 2: Cables for general applications;
- Part 3: Cables with special fire performance.
Parts 2 and 3 are further subdivided for the particular cables and applications.
NOTE Annex E gives a full description of the structure of EN 50525, its content and its derivation from HD 21 and
HD 22.
An intention of the conversion work, which forms part of an overall CENELEC initiative to
convert remaining HDs to ENs, is to create a structure for the EN that will be sufficiently
robust to ensure a simple means of making future additions or amendments.
As part of the work there has been a review of the market relevance of cable types in HD 21
and HD 22, and changes have been made accordingly.
Some matters previously in HD 21 and HD 22 are now in separate publications thus:
- Insulating, sheathing and covering materials – EN 50363 series;
- Electrical test methods – EN 50395;
- Non-electrical test methods – EN 50396.
The collective object of all parts of EN 50525 is:
- to standardise cables that are safe and reliable when properly selected, installed and
used;
- to state the characteristics and manufacturing requirements directly or indirectly bearing
on safety; and
- to specify methods for checking conformity with those requirements.
European and national regulations contain requirements and recommendations relating to the
environment. CENELEC TC 20 has published a Technical Report (TR) that offers guidance
and assistance to standard-writers of TC 20, to take into account the relevant environmental
aspects as far as they are specific to electric cables in normal use. The TR is
CLC/TR 62125, Environmental statement specific to TC 20 - Electric cables
This EN takes account, where appropriate and practicable, of the guidance in CLC/TR 62125.
Cables within EN 50525 satisfy the essential health and safety requirements of the Low
Voltage Directive (2006/95/EC).
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1 Scope
This European Standard gives the general requirements for rigid and flexible energy cables
of rated voltages U /U up to and including 450/750 V a.c., used in power installations and
0
with domestic and industrial appliances and equipment.
NOTE 1 For some types of flexible cables, the term "cord" is used.
NOTE 2 Rated voltages are given by reference to alternating current (a.c.) systems. Use of the cables in direct
current (d.c.) systems is permitted.
NOTE 3 National regulations may prescribe additional performance requirements for cables that are not given in the particular
requirements. For example for buildings with high levels of public access, additional fire performance requirements may be
applicable,
The test methods for checking conformity with the requirements are given in other standards
(see Introduction).
The particular types of cables are specified in EN 50525-2 (series) and EN 50525-3 (series).
The individual parts within those two series are collectively referred to hereafter as "the
particular specifications".
Only the sizes (conductor class, cross-sectional area), number of cores, other constructional
features and rated voltages given in the particular specification apply to the individual cable
type.
The code designations of these types of cables are in accordance with HD 361.
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.
NOTE One or more references to the standards below are in respect of a specific sub-division of that standard,
for instance a clause, a table, a class or a type. Cross-references to these standards are undated and, at all times,
the latest version applies.
EN 50267-2-1 Common test methods for cables under fire conditions – Tests on
gases evolved during combustion of materials from cables – Part 2-1:
Procedures – Determination of the amount of halogen acid gas
EN 50267-2-2 Common test methods for cables under fire conditions – Tests on
gases evolved during combustion of materials from cables – Part 2-2:
Procedures – Determination of degree of acidity of gases for materials
by measuring pH and conductivity
EN 50334 Marking by inscription for the identification of cores of electric cables
EN 50363 Series Insulating, sheathing and covering materials for low-voltage energy
cables
EN 50395 Electrical test methods for low voltage energy cables
EN 50396 Non electrical test methods for low voltage energy cables
EN 60228 Conductors of insulated cables (IEC 60228)
EN 60684-2 Flexible insulating sleeving – Part 2: Methods of test (IEC 60684-2)
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HD 308 Identification of cores in cables and flexible cords
HD 361 System for cable designation
HD 516 Guide to use of low voltage harmonized cables
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
type tests (Symbol T)
tests required to be made before supplying a type of cable covered by this standard on a
general commercial basis, in order to demonstrate satisfactory performance characteristics to
meet the intended application
NOTE These tests are of such a nature that, after they have been made, they need not be repeated unless
changes are made in the cable materials, design or type of manufacturing process which might change the
performance characteristics.
3.2
sample tests (Symbol S)
tests made on samples of completed cable, or components taken from a completed cable
adequate to verify that the finished product meets the design specifications
3.3
routine tests (Symbol R)
tests made on all production cable lengths to demonstrate their integrity
3.4
dummy core
extruded element having the same overall diameter as the insulated core
4 Rated voltage
The rated voltage of a cable is the reference voltage for which the cable is designed.
The rated voltage in an alternating current system, is expressed by the combination of two
values U /U, expressed in volts, where:
0
a) U is the r.m.s. value between any insulated conductor and “earth” (metal covering of the
0
cable or the surrounding medium);
b) U is the r.m.s. value between any two phase conductors of a multicore cable or of a
system of single core cables.
In an alternating current system, the rated voltage of a cable should be at least equal to the
nominal voltage of the system for which it is intended. This condition applies to the values of
both U and U.
0
NOTE For information about the maximum permanent permitted operating voltage of the system (a.c. or d.c.)
refer to HD 516.
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5 Requirements for the construction of cables
5.1 General
The requirements given in this Part 1 shall apply to all cables in EN 50525, except where
otherwise specified in the particular specification.
NOTE The particular specification may deviate from the general requirements, either by addition, subtraction or
amendment.
5.2 Conductors
5.2.1 Material
The conductors shall be copper, and in accordance with EN 60228.
The wires of conductors may be plain or metal coated, for example with tin or silver. Coated
wires shall be covered with a continuous layer of the coating.
There shall be no visible gaps in the continuous layer, when examined with normal or
corrected vision.
5.2.2 Construction
The maximum diameters of the wires of flexible conductors and the minimum number of the
wires of rigid conductors shall be in accordance with EN 60228.
The classes of the conductors relevant to the various types of cables are given in the
particular specifications.
5.2.3 Separator between conductor and insulation
Unless otherwise specified in the particular specification it is permitted to place a separator
tape between the conductor and the insulation.
5.2.4 Check of construction
Compliance with the requirements of 5.2.1, 5.2.2 and 5.2.3, including the requirements of
EN 60228, shall be checked by inspection and by measurement.
5.2.5 Electrical resistance
The resistance of each conductor at 20 °C shall be in accordance with the requirements of
EN 60228 for the given class of the conductor.
Compliance shall be checked by the test given in Clause 5 of EN 50395.
5.3 Insulation
5.3.1 Material
The insulation material shall be specified in the particular specification, and shall be selected
from those given in EN 50363.
The requirements for the insulation are specified in the relevant part of EN 50363, which also
gives the maximum continuous conductor operating temperatures for each insulation compound.
NOTE The maximum operating and short-circuit temperatures for a particular cable may be lower than that for
the specific insulation compound. See HD 516 for further guidance.
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5.3.2 Application to the conductor
The insulation shall be applied by extrusion, such that it fits closely on the conductor, but
does not adhere to it. It shall be possible to remove it without damage to the insulation itself,
to the conductor or to the metal coating if any. It is permitted to apply the insulation in a
single layer, or in a number of coherent layers. Where more than one layer is used, all testing
shall be carried out on the complete insulation as though it were a single layer.
NOTE Insulation applied in more than one layer does not conform to the definition of “Double insulation” given,
for instance, in HD 60364.
Compliance shall be checked by inspection and by manual test.
5.3.3 Thickness
The mean value of the thickness of insulation shall be not less than the specified value for
each type and size of cable shown in the tables of the particular specifications.
However, the thickness at any place may be less than the specified value provided that the
difference does not exceed 0,1 mm + 10 % of the specified value.
Compliance shall be checked by the test given in 4.1 of EN 50396.
5.4 Core identification
5.4.1 General
Identification of the cores of a cable shall be achieved by the use of coloured insulation or by
a coloured surface.
The colours shall be clearly identifiable and durable. Durability shall be checked by the test
given in 5.1 of EN 50396.
NOTE 1 It is not a requirement of the standard that colours should be an exact match against a particular scheme
or chart. If there is a case of doubt about the identification of a particular colour, reference should be made to
HD 402.
NOTE 2 Cores identified by the colour blue, and those identified by the bi-colour green-and-yellow, have specific
functionality that is described in EN 60445. The application of cables with these colours is specified in HD 60364
and the equivalent national standards implementing the HD.
5.4.2 Single core cables – Non-sheathed cables
The core colours shall be chosen from the following:
a) For cable types rated 300/500 V (H05 types) the following mono-colours are recognised:
black, blue, brown, grey, orange, pink, red, turquoise, violet, white, green and yellow.
Bi-colours of any combination of the above mono-colours are permitted. The distribution
of the colours for the core bi-coloured green-and-yellow shall comply with 5.4.4.
b) For cable types rated 450/750 V (H07 types) the following mono-colours are recognised:
black, blue, brown, grey, orange, pink, red, turquoise, violet and white. Bi-colours shall
not be used except the combination of the mono-colours green-and-yellow, the
distribution of the colours of which shall comply with 5.4.4.
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5.4.3 Multicore sheathed cables
5.4.3.1 Identification by colour
Each core of a multicore cable shall have only one colour, except the core identified by a
combination of the colours green-and-yellow. In multicore cables, the colours green and
yellow shall not be used separately as single colours.
For multicore cables with two to five cores, the core colours, and their rotational position in the
cable, shall be in accordance with HD 308.
5.4.3.2 Identification by numbering
Where the particular specification permits identification of the cores of multicore cables by
numbering, it shall conform to EN 50334.
5.4.3.3 Cables with more than five cores
Multicore cables with more than five cores shall be identified in accordance with Annex D.
5.4.4 Colour combination green-and-yellow
The combination of the colours green-and-yellow shall be such that, on any 15 mm length of
the core, one of these colours covers at least 30 % and not more than 70 % of the surface of
the core, the other colour covering the remainder of that surface.
NOTE This requirement is in accordance with EN 60445.
Compliance shall be checked using one of the test methods in 5.2 of EN 50396.
5.5 Assembly of cores
For flat cables the cores shall be laid parallel.
The cores of circular cables shall be twisted together.
Additional requirements for assembly may be given in the particular specification.
5.6 Other components
5.6.1 General
Apart from a sheath, any of the following components may be included in the construction of
the cables:
a) interstitial fillers;
b) strain-bearing members;
c) inner covering;
d) inner sheath;
e) metallic screen;
f) textile braid covering.
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The inclusion of one or more of the above components shall be given in the particular
specification. Where a component is specified it shall comply with the appropriate
requirements of 5.6.2 to 5.6.7 below.
5.6.2 Interstitial fillers
5.6.2.1 Composition
Fillers shall be composed of one of the following or of any combination of the following:
− a compound based on polymeric materials; or
− natural or synthetic textiles; or
− paper.
A strain bearing member (sbm) may also form part of the internal construction of a cable and,
if present, shall conform to 5.6.3.
5.6.2.2 Assembly
The assembly of cores and fillers may be held together by a film or tape.
In multicore cables, a centre filler is permitted.
5.6.2.3 Requirements
Fillers shall fill the spaces between the cores, and shall not adhere to the cores. The fillers
shall be capable of being removed without damage to the cores.
NOTE Incorporation of fillers should lead to the finished cable having a practically circular shape (see 5.7.2.1).
There shall be no harmful interactions between the fillers and the insulation and/or the
sheath. Compliance shall be checked as part of the compatibility test requirements for the
particular cable.
5.6.3 Strain bearing members (sbm)
Where a strain bearing member, or members, is required it shall be incorporated into the
cable in accordance with the particular specification. It may be metallic or non-metallic
according to the particular specification.
There shall be no harmful interactions between the sbm and the insulation and/or the sheath.
This shall be checked as given for fillers in 5.6.2.
5.6.4 Inner covering
Extruded inner coverings shall be composed of a compound based on polymeric materials.
No dimensional measurements shall be required for inner coverings.
There shall be no harmful interactions between inner coverings and the insulation and/or
sheath. Compliance shall be checked as part of the compatibility test requirements for the
particular cable.
Extruded inner coverings shall surround the cores.
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NOTE Incorporation of an inner covering should lead to the finished cable having a practically circular shape
(see 5.7.2.1).
An inner covering shall not adhere to the cores, and shall be capable of being removed
without damage to the cores. Where indicated in the particular specification the inner
covering may penetrate between the cores, thus forming a filling.
5.6.5 Inner sheath
Extruded inner sheaths shall be composed of a compound in accordance with EN 50363.
Requirements for the thickness of inner sheaths shall be as given in the particular
specification.
There shall be no harmful interactions between inner sheaths and the insulation and/or
sheath. Compliance shall be checked as part of the compatibility test requirements for the
particular cable.
Extruded inner sheaths shall surround the cores.
NOTE Incorporation of an inner sheath should lead to the finished cable having a practically circular shape (see
5.7.2.1).
An inner sheath shall not adhere to the cores, and shall be capable of being removed without
damage to the cores. Where indicated in the particular specification the inner sheath may
penetrate between the cores, thus forming a filling.
5.6.6 Metallic screen
The screen shall be composed of a braid of copper wires. The wires may be plain or metal-
coated.
Coated wires shall be covered with a continuous layer of the coating.
There shall be no visible gaps in the continuous layer, when examined with normal or
corrected vision.
The screen shall be applied over an inner sheath.
Requirements for the diameter of wires for metallic screens shall be as given in the particular
specification.
5.6.7 Textile braid
5.6.7.1 Material
The material for the yarns may be based on natural material (cotton, or treated cotton) or on
synthetic material (polyamide, etc.) or else may be filaments made of glass or equivalent
material.
5.6.7.2 Application
The braid shall have a uniform texture, without knots or gaps. Braids made from glass
filaments shall be prevented from fraying.
NOTE Fraying of glass braids may be prevented by the use of a suitable quality of glass, or by treatment of
each filament or the complete braid with a suitable coating.
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5.7 Sheath
5.7.1 Material
The sheath material shall be specified in the particular specification, and shall be selected
from those given in EN 50363.
The requirements for the sheath are specified in the relevant part of EN 50363, which also
gives the maximum cable operating temperatures for each sheath compound.
NOTE Single core arc welding cables to EN 50525-2-81 are rated 100/100 V and have a protective layer
referred to as a "covering". For completeness, the relevant material is also listed in EN 50363.
5.7.2 Application
5.7.2.1 General
The sheath shall be applied by extrusion and shall consist of a single layer unless otherwise
specified in the parti
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