SIST EN 50576:2023
(Main)Electric cables - Extended application of test results for reaction to fire
Electric cables - Extended application of test results for reaction to fire
This EN gives the procedure and rules for extended application of results of tests carried out according to the test methods described in EN 50399, EN 60332 1 2 and EN 61034 2.
The EXAP rules described apply to EN 50399 test results used for classification in classes B2ca, Cca and Dca, additional smoke production classes s1, s2 and s3 and flaming droplets/particles, to EN 60332 1 2 test results used for classification in classes B2ca, Cca, Dca and Eca and to EN 61034 2 test results used for classification in classes s1a and s1b.
No EXAP procedure and rules have been developed in respect of the results of tests carried out
according to the test method described in EN 60754–2. As the parameters (pH and conductivity) for each cable in a family are determined based upon calculation using material test results, this is considered as a matter of direct application. Material test results taken from any one sample of finished cable from a family are sufficient to calculate the parameters for each cable in the family.
Cables of diameter 5,0 mm and less should be tested as bundles according to EN 50399. Bundled cables are not included in the EXAP rules applying to EN 50399 test results.
The rules apply to circular and non-circular cables provided that they fall within the scope of the relevant test method.
A specific EXAP rule has been developed for the most common generic power cable families, optical fibre cables and copper communication cables (CCC). A general EXAP rule has been developed for any power cable families. The general EXAP rule is not applicable to communication or optical fibre cables.
NOTE 1 Multicore power cables are sometimes referred to as control cables with a rated voltage but for the purposes of this standard are considered as power cables. For multipair, multitriple and multiquad control cables either the general EXAP rule for power cables or the specific EXAP rule for copper communication cables can be applied.
The general EXAP rule may be applied in the case of hybrid cables provided that the conditions of 6.1 are fulfilled.
The use of the specific EXAP rule gives benefit in the lower number of cables to be tested for a range of cable constructions (product family).
An EXAP is only possible when cables belong to a defined family as defined in this standard.
Erweiterte Anwendung von Prüfergebnissen bezüglich Brandverhalten
Dieses Dokument enthält das Verfahren und die Regeln für die erweiterte Anwendung von Ergebnissen aus Prüfungen, die nach den in EN 50399, EN 60332-1-2 und EN 61034-2 beschriebenen Prüfverfahren durchgeführt wurden.
Die hierin beschriebenen EXAP-Regeln gelten für nach EN 50399 erhaltene Prüfergebnisse für die Einstufung nach EN 13501-6 in die Klassen B2ca, Cca und Dca sowie die zusätzlichen für die Rauchentwicklung geltenden Klassen s1, s2 und s3 und brennendes Abtropfen/Abfallen, für nach EN 60332-1-2 erhaltene Prüfergebnisse für die Einstufung in die Klassen B2ca, Cca, Dca und Eca und für nach EN 61034-2 erhaltene Prüfergebnisse für die Einstufung in die Klassen s1a und s1b.
Es wurden weder EXAP-Verfahren noch -Regeln in Bezug auf die Ergebnisse aus Prüfungen entwickelt, die nach der in EN 60754-2 beschriebenen Prüfmethode durchgeführt werden. Da die Parameter (pH-Wert und Leitfähigkeit) jedes Kabels bzw. jeder Leitung einer Familie auf der Grundlage von Berechnungen mittels Ergebnissen aus Materialprüfungen, ermittelt werden, können diese Ergebnisse prinzipiell direkt angewendet werden. Für die Berechnung der Parameter jedes Kabels bzw. jeder Leitung in einer Familie sind die Ergebnisse aus Materialprüfungen eines Musters eines fertig produzierten Kabels bzw. Leitung aus der Familie ausreichend.
Es wird erwartet, dass Kabel und Leitungen mit einem Durchmesser von bis zu 5,0 mm als Bündel nach EN 50399 geprüft werden. Kabel und Leitungen mit einem Durchmesser von kleiner oder gleich 5,0 mm sind nur in den speziellen und allgemeinen EXAP-Regeln für einadrige Starkstromkabel und -leitungen ohne Mantel enthalten. Die Regeln gelten für runde und nichtrunde Kabel und Leitungen, vorausgesetzt sie fallen in den Anwendungsbereich der jeweiligen Prüfmethode.
Für jeden Typ der in diesem Dokument aufgeführten elektrischen Kabel- oder Leitungsfamilien wurde eine spezielle EXAP-Regel erarbeitet. Darüber hinaus wurde eine allgemeine EXAP-Regel entwickelt, die sich auf alle Familien von Kabeln oder Leitungen anwenden lässt, sofern in diesem Dokument nicht anders angegeben.
ANMERKUNG 1 Mehradrige Starkstromkabel oder -leitungen werden manchmal auch als Steuerleitungen mit einer Nenn-spannung bezeichnet, werden aber für die Anwendung dieses Dokuments als Starkstromkabel oder -leitungen angesehen. Für Multipair-, Multitriple- und Multiquad-Steuerleitungen kann entweder die allgemeine EXAP-Regel oder die spezielle EXAP-Regel für Starkstromkabel oder -leitungen oder die spezielle EXAP-Regel für Kommunikationskabel angewendet werden.
Die Anwendung der speziellen EXAP-Regel hat den Vorteil, dass für eine bestimmte Gruppe von Kabel- oder Leitungsbauarten (Produktfamilie) jeweils eine geringere Anzahl an Kabeln geprüft werden muss.
Eine Anwendung der EXAP-Regeln ist nur dann möglich, wenn die betreffenden Kabel zu einer bestimmten Familie nach der Definition in dem vorliegenden Dokument gehören.
ANMERKUNG 2 Für die Anwendung dieses Dokuments schließt der Begriff Kabel und Leitungen Lichtwellenleiterkabel ein.
Câbles électriques - Application étendue des résultats d'essai pour la réaction au feu
Le présent document donne les procédures et règles relatives à l’application étendue des résultats d’essai réalisés selon les méthodes d’essai décrites dans l’EN 50399, l’EN 60332 1 2 et l’EN 61034 2.
Les règles EXAP décrites s’appliquent aux résultats d’essai EN 50399 utilisés pour le classement, conformément à l’EN 13501 6, en classes B2ca, Cca et Dca, les classements complémentaires s1, s2 et s3 pour la production de fumée, et pour les gouttelettes/particules enflammées, aux résultats d’essai EN 60332 1 2 utilisés pour le classement en classes B2ca, Cca, Dca et Eca, et aux résultats d’essai EN 61034 2 utilisés pour la classification en classements complémentaires s1a et s1b.
Aucune procédure ni aucune règle EXAP n’ont été développées concernant les résultats des essais réalisés conformément à la méthode d’essai décrite dans l’EN 60754 2. Comme les paramètres (pH et conductivité) pour chaque câble au sein d’une famille sont déterminés par calcul, en utilisant les résultats des essais sur matériau, ils sont considérés relever de l’application directe. Les résultats des essais sur matériau provenant d’un quelconque échantillon de câble fini au sein d’une famille sont suffisants pour calculer les paramètres pour chaque câble de la famille.
Les câbles de diamètre inférieur ou égal à 5,0 mm sont prévus pour être soumis à essai en faisceaux, conformément à l’EN 50399. Les câbles de diamètre inférieur ou égal à 5,0 mm sont inclus dans la règle EXAP spécifique et dans la règle EXAP générale, uniquement pour les câbles d’énergie monoconducteurs non gainés. Les règles s’appliquent aux câbles circulaires et non circulaires, sous réserve qu’ils relèvent du domaine d’application de la méthode d’essai correspondante.
Une règle EXAP spécifique a été développée pour les familles génériques de câbles d’énergie les plus courantes, les câbles à fibres optiques et les câbles de communication. Une règle EXAP générale a été développée pour toutes les familles de câbles électriques, sauf spécification contraire en un point quelconque du présent document.
NOTE 1 Les câbles d’énergie multiconducteurs sont parfois désignés comme des câbles de commande à tension assignée, mais pour les besoins du présent document, ils sont considérés comme des câbles d’énergie. Pour les câbles de commande à plusieurs paires, à plusieurs tierces et à plusieurs quartes, soit la règle EXAP générale ou spécifique pour les câbles d’énergie, soit la règle EXAP spécifique pour les câbles de communication peut être appliquée.
L’utilisation de la règle EXAP spécifique présente un avantage en ce qui concerne le faible nombre de câbles à soumettre à essai pour une gamme de construction de câbles (famille de produits).
Une EXAP n’est possible que lorsque les câbles appartiennent à une famille définie, comme précisé dans le présent document.
NOTE 2 Pour les besoins du présent document, le terme "câbles électriques" couvre également les câbles à fibres optiques.
Električni kabli - Razširjena uporaba rezultatov preskusov odziva na ogenj
Ta standard določa postopek in pravila za razširjeno uporabo rezultatov preskusov, izvedenih v skladu s preskusnimi metodami iz standardov EN 50399, EN 60332-1-2 in EN 61034-2.
Opisana pravila razširjene uporabe se uporabljajo za rezultate preskusov iz standarda EN 50399, ki se uporabljajo za klasifikacijo v razredih B2ca, Cca in Dca, dodatnih razredih nastajanja dima s1, s2 in s3 ter gorečih kapljic/delcev, za rezultate preskusov iz standarda EN 60332-1-2, ki se uporabljajo za klasifikacijo v razredih B2ca, Cca, Dca in Eca, ter za rezultate preskusov iz standarda EN 61034 2, ki se uporabljajo za klasifikacijo v razredih s1a in s1b.
V zvezi z rezultati preskusov, izvedenih v skladu s preskusno metodo,
opisano v standardu EN 60754-2, niso bili izdelani nobeni postopki ali pravila razširjene uporabe. Ker se parametri (pH in prevodnost) za vsak kabel v družini določajo na podlagi izračuna z rezultati preskusov materialov, se to obravnava kot predmet neposredne uporabe. Za izračun parametrov za posamezen kabel v družini zadoščajo rezultati preskusov materialov, izvedenih pri katerem koli vzorcu dokončanega kabla iz družine.
Kabli premera 5,0 mm in manj naj bodo preskušeni v snopih v skladu s standardom EN 50399. Kabli v snopu niso zajeti v pravilih razširjene uporabe, ki se uporabljajo za rezultate preskusov iz standarda EN 50399.
Pravila se uporabljajo za krožne in nekrožne kable pod pogojem, da ti spadajo na področje uporabe ustrezne preskusne metode.
Za najpogostejše splošne družine napajalnih kablov, optične kable in bakrene komunikacijske kable (CCC) je bilo oblikovano posebno pravilo razširjene uporabe. Za vse družine napajalnih kablov je bilo oblikovano splošno pravilo razširjene uporabe. Splošno pravilo razširjene uporabe se ne uporablja za komunikacijske ali optične kable.
OPOMBA 1: Večjedrni napajalni kabli se včasih imenujejo krmilni kabli z nazivno napetostjo, vendar se za namene tega standarda obravnavajo kot napajalni kabli. Za dvojne, trojne in četverne krmilne kable je mogoče uporabiti splošno pravilo razširjene uporabe za napajalne kable ali posebno pravilo razširjene uporabe za bakrene komunikacijske kable.
Splošno pravilo razširjene uporabe se lahko uporablja v primeru hibridnih kablov, če so izpolnjeni pogoji iz točke 6.1.
Uporaba posebnega pravila razširjene uporabe ima to prednost, da je treba za niz kabelskih konstrukcij (družino izdelkov) preskusiti manjše število kablov.
Razširjena uporaba je mogoča le, kadar kabli pripadajo določeni družini, kot je opredeljeno v tem standardu.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 50576:2023
01-februar-2023
Nadomešča:
SIST-TS CLC/TS 50576:2017
Električni kabli - Razširjena uporaba rezultatov preskusov odziva na ogenj
Electric cables - Extended application of test results for reaction to fire
Erweiterte Anwendung von Prüfergebnissen bezüglich Brandverhalten
Câbles électriques - Application étendue des résultats d'essai pour la réaction au feu
Ta slovenski standard je istoveten z: EN 50576:2022
ICS:
13.220.40 Sposobnost vžiga in Ignitability and burning
obnašanje materialov in behaviour of materials and
proizvodov pri gorenju products
29.060.20 Kabli Cables
SIST EN 50576:2023 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 50576:2023
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SIST EN 50576:2023
EUROPEAN STANDARD EN 50576
NORME EUROPÉENNE
EUROPÄISCHE NORM December 2022
ICS 13.220.40; 29.060.20 Supersedes CLC/TS 50576:2016
English Version
Electric cables - Extended application of test results for reaction
to fire
Câbles électriques - Application étendue des résultats Kabel und Leitungen - Erweiterte Anwendung von
d'essai pour la réaction au feu Prüfergebnissen bezüglich Brandverhalten
This European Standard was approved by CENELEC on 2022-12-12. 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 CEN-CENELEC
Management Centre 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 CEN-CENELEC Management Centre 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, 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. EN 50576:2022 E
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SIST EN 50576:2023
EN 50576:2022 (E)
Contents Page
European foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Extended application of test results (EXAP) . 9
4.1 Product families for EXAP . 9
4.1.1 General . 9
4.1.2 Product families for power cables . 10
4.1.3 Product families for communication cable . 11
4.1.4 Product families for optical fibre cables . 11
5 Specific EXAP for EN 50399 test with safety margin . 12
5.1 Rules for power cables . 12
5.1.1 General . 12
5.1.2 Extension to cables larger than the tested range . 13
5.1.3 Single core unsheathed power cables with a diameter of less than or equal to 5,0 mm
13
5.2 Rules for optical fibre cables . 14
5.3 Rules for communication cables . 15
6 General EXAP for EN 50399 test for electric cables . 16
6.1 General . 16
6.1.1 Introduction . 16
6.1.2 Selection of cable parameter, n = 3 cables . 17
6.1.3 Selection of cable parameters, n > 3 cables . 18
7 EXAP rule for EN 50399 test for flaming droplets/particles for electric cables . 18
8 EXAP rule for EN 60332-1-2 test for classes B2 , C and D for electric cables . 18
ca ca ca
9 EXAP rule for EN 60332-1-2 test for class E for electric cables . 19
ca
10 Direct application rule for EN 60754-2 test for electric cables . 19
11 EXAP rule for EN 61034-2 test for electric cables. 19
Annex A (informative) An example of flow chart and checklist for specific EXAP . 21
A.1 Basic EXAP procedure flow chart. 21
A.2 Checklist for specific EXAP . 22
Annex B (normative) Rounding of numbers . 23
Annex C (informative) Examples to specific and general EXAP . 24
C.1 For specific EXAP for EN 50399 test . 24
C.2 For general EXAP for EN 50399 test . 24
Bibliography . 28
2
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EN 50576:2022 (E)
Tables
Table 1 — Safety margins v for power cables . 12
sm
Table 2 — Allowed range of cable diameters and cable parameters for using safety margins as
specified in Table 1 . 13
Table 3 — Allowed ranges of d for EXAP applied for larger cables . 13
max
Table 4 — Safety margins v for single core unsheathed power cables with a diameter of less than or
sm
equal to 5,0 mm . 14
Table 5 — Safety margins ν for optical fibre cables . 15
sm
Table 6 — Safety margins ν for communication cables . 16
sm
Figures
Figure A.1 — Flow chart of the EXAP procedure . 21
Figure C.1 — Assessment of ν for the classification parameter TSP (theoretical example) . 24
class
Figure C.2 — FIGRA results for cable family . 25
Figure C.3 — TSP results for cable family . 26
Figure C.4 — TSP results for cable family . 27
3
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SIST EN 50576:2023
EN 50576:2022 (E)
European foreword
This document (EN 50576:2022) has been prepared by CLC/TC 20 “Electric cables”.
The following dates are fixed:
• latest date by which this document has to be (dop) 2023-12-12
implemented at national level by publication of
an identical national standard or by
endorsement
• latest date by which the national standards (dow) 2025-12-12
conflicting with this document have to be
withdrawn
This document supersedes CLC/TS 50576:2016 and all of its amendments and corrigenda (if any).
EN 50576:2022 includes the following significant technical changes with respect to CLC/TS 50576:2016:
— Inclusion of EXAP rule for single core unsheathed power cables with a diameter of less than or equal to
5,0 mm [8];
— simplification of the choice of samples to the EXAP rule for EN 60332-1-2 for classes B2 , C and D for
ca ca ca
electric cables;
— simplification of the choice of samples due to the changes in the test standard to the EXAP rule for
EN 61034-2;
— implementation of a direct application rule for EN 60754-2;
— improvement of d to the Table 2.
min
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.
This document is read in conjunction with EN 50575 in order to evaluate the reaction to fire performance of
power, control and communication cables.
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.
4
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EN 50576:2022 (E)
Introduction
The original project “CEMAC – CE marking of cables” was carried out over a three-year period. It brought
together cable manufacturers, research and testing laboratories, and research establishments in creating the
technical background and developing rules and procedures for extended application of test results (EXAP).
More than 200 tests to EN 50399 on more than 100 cables were carried out as part of the project. The final
report [1] was published in 2010 and the EXAP rules and procedures developed by the CEMAC project have
been used as the basis for this document.
A specific EXAP procedure and rules based on the use of safety margins and a cable parameter derived from
the extensive CEMAC tests was developed for the most common generic types of power cables used in the
European market.
A general EXAP procedure and rules based upon a statistical treatment of the actual test results obtained from
a cable family was also developed for any power cables. However, the use of this general procedure and rules
will generally require more tests to be carried out than the use of the specific procedure and rules.
Since the CEMAC project report was completed in 2010, the project has been extended to further investigate
the performance of optical fibre cables and rules and procedures developed for extended application of test
results for these products. An additional report [2] was published in 2015 and the EXAP rules and procedures
developed by the further CEMAC project work was used as the basis for CLC/TS 50576:2016.
Since 2016, the project has been extended to further investigate the performance of communication cables and
rules and procedures developed for extended application of test results for these products. The work [7] was
published in 2016 and has been included in this document.
In addition, this edition includes editorial improvements and re-arrangements.
General guidance on direct and extended application can be found in CEN/TS 15117 [3].
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EN 50576:2022 (E)
1 Scope
This document describes the procedure and rules for extended application of results of tests carried out
according to the test methods described in EN 50399, EN 60332-1-2 and EN 61034-2.
The EXAP rules described apply to EN 50399 test results used for classification according to EN 13501-6 in
classes B2 , C and D , additional smoke production classes s1, s2 and s3 and flaming droplets/particles, to
ca ca ca
EN 60332-1-2 test results used for classification in classes B2 , C D and E and to EN 61034-2 test
ca ca, ca ca
results used for classification in classes s1a and s1b.
No EXAP procedure and rules have been developed in respect to the results of tests carried out according to
the test method described in EN 60754-2. As the parameters (pH and conductivity) for each cable in a family
are determined based upon calculation using material test results, this is considered as a matter of direct
application. Material test results taken from any one sample of finished cable from a family are sufficient to
calculate the parameters for each cable in the family.
Cables with a diameter of 5,0 mm or less are expected to be tested as bundles according to EN 50399. Cables
with a diameter of less than or equal to 5,0 mm are included in the specific and general EXAP rules for single
core unsheathed power cables only. The rules apply to circular and non-circular cables provided that they fall
within the scope of the relevant test method.
A specific EXAP rule has been developed for any of the types of electric cable families as defined in this
document. A general EXAP rule has been developed for all electric cable families unless otherwise stated
elsewhere in this document.
NOTE 1 Multicore power cables are sometimes referred to as control cables with a rated voltage but for the purposes of
this document are considered as power cables. For multipair, multitriple and multiquad control cables, either the general
EXAP rule or the specific EXAP rule for power cables or the specific EXAP rule for communication cables can be applied.
The use of the specific EXAP rule gives benefit in the lower number of cables to be tested for a range of cable
constructions (product family).
An EXAP is only possible when cables belong to a family as defined in this document.
NOTE 2 For the purposes of this document, the term “electric cables” also covers optical fibre cables.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references, the
latest edition of the referenced document (including any amendments) applies.
EN 13501-6, Fire classification of construction products and building elements - Part 6: Classification using data
from reaction to fire tests on power, control and communication cables
EN 50399, Common test methods for cables under fire conditions - Heat release and smoke production
measurement on cables during flame spread test - Test apparatus, procedures, results
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 pre-mixed flame (IEC 60332-1-2)
EN 60754-2, Test on gases evolved during combustion of materials from cables - Part 2: Determination of acidity
(by pH measurement) and conductivity (IEC 60754-2)
EN 61034-2, Measurement of smoke density of cables burning under defined conditions - Part 2: Test procedure
and requirements (IEC 61034-2)
6
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SIST EN 50576:2023
EN 50576:2022 (E)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp/
— IEC Electropedia: available at https://www.electropedia.org/
3.1
classification
process defined in EN 13501-6, whereby the fire performance parameters obtained from the results of one test,
or a set of tests, or from a process of extended application, are compared with limiting values for those
parameters that are set as criteria for achieving a certain classification
3.2
electric cable
all power, control and communication cables, including optical fibre cables and hybrid cables which are a
combination of two or more of these cable types
[SOURCE: EN 50575]
3.3
power cable
assembly comprising one or more insulated conductor(s), together with any coverings and protective layers,
used for the transmission or supply of electrical energy
[SOURCE: EN 50575]
3.4
control cable
assembly comprising insulated conductors, together with any coverings and protective layers, used for the
transmission of control, measuring and indication signals in electric installations
[SOURCE: EN 50575]
3.5
communication cable
assembly of suitably insulated coaxial conductors or twisted pairs of insulated conductors fabricated to meet
transmission, mechanical and environmental requirements, and sufficient to allow conveyance of information
between two points with the minimum of radiation
[SOURCE: EN 50575]
Note 1 to entry: For this document, only communication cables with copper conductors are considered.
3.6
optical fibre cable
assembly comprising one or more optical fibres or fibre bundles inside a common covering designed to protect
them against mechanical stresses and other environmental influences while retaining the transmission quality
of the fibres
[SOURCE: IEV 731-04-01]
7
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EN 50576:2022 (E)
3.7
product family
group of products produced by one manufacturer for which the test results for one or more characteristics from
one product within the family are considered to be representative for that same characteristic for all other
products within this family
[SOURCE: EN 50575]
3.8
extended application of test results
EXAP
outcome of a process (involving the application of defined rules that may incorporate calculation procedures)
that attributes, for a cable family, a test result on the basis of one or more test results to the same test standard
3.9
heat release rate
HRR
thermal energy released per unit time by an item during combustion under specified conditions
[SOURCE: EN 50399]
3.10
total heat release
THR
integrated value of the heat release rate over a defined period
[SOURCE: EN 50399]
3.11
smoke production rate
SPR
smoke production per unit time
[SOURCE: EN 50399]
3.12
total smoke production
TSP
integrated value of the smoke production rate over a defined period
[SOURCE: EN 50399]
3.13
flame spread
FS
propagation of a flame front
[SOURCE: EN 50399]
3.14
fire growth rate index
FIGRA
highest value of the quotient between HRR and time
[SOURCE: EN 50399]
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EN 50576:2022 (E)
3.15
flaming droplet/particle
material separating from the specimen during the test and continuing to flame for a minimum period as described
in the test method
[SOURCE: EN 50399]
3.16
armour
covering consisting of a metal tape(s) or wires, generally used to protect the cable from external mechanical
defects
Note 1 to entry: For the purpose of this document, metallic tape thicker than or equal 0,10 mm thickness is
considered an armour.
Note 2 to entry: Examples for wire coverings are concentric conductors or braids.
[SOURCE: IEV 461-05-06]
3.17
non-circular cable
cable where the measured difference between any two values of the overall diameter of the cable at the same
cross-section exceeds 15 % of the largest overall diameter
Note 1 to entry: So-called figure of 8 cables, consisting of two exactly identical circular cables connected together
with a very small, extruded interconnecting link are considered to be non-circular cables.
[SOURCE: EN 50399]
4 Extended application of test results (EXAP)
4.1 Product families for EXAP
4.1.1 General
4.1.1.1 Introduction
An EXAP is only possible when cables belong to a defined family.
The cable family shall be produced by the same manufacturer using the same materials and the same design
rules (for instance International standard, National standard, Company standard based on National or
International standard), subject to the provisions of 4.1.2 to 4.1.4.
NOTE A common design rule is that the thickness of the design elements (for instance insulation and/or sheath
thickness) increase with conductor size and cable diameter. These cables, using this common design rule, belong to the
same cable family.
The full constructional and material details for the family shall be submitted to the certification body prior to the
EXAP being applied.
4.1.1.2 Colour and marking of design elements
A change to the colour of design elements (for instance insulation, fibre and/or sheath) or to the marking on
insulation and/or sheath does not constitute a different cable family.
9
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4.1.1.3 Centre filler and interstitial fillers
It is common that part of the cables in a product range have a centre filler (depending on number of cores and/or
cross section) and part of the cables in that product range are without centre filler.
If the volume of the centre filler is equal to or less than 10 % of the total non-metallic volume, the cable with
centre filler belongs to the same family as the cables without centre filler (on the condition that all other
requirements of this document are fulfilled).
If the volume of the centre filler is greater than 10 % of the total non-metallic volume, the cable with centre filler
constitutes a different family than the cables without centre filler.
The volume of the centre filler shall in any case be taken into account in the calculation of the cable parameter.
For cables with and without interstitial fillers, other than centre filler and/or filling compound, the cables are
considered to belong to different product families.
4.1.1.4 Tapes
Cables with or without tapes are to be treated as follows:
a) with/without metallic or metallized tape: different families;
b) with/without non-combustible tapes (such as mica tapes and glass tapes): different family;
c) with/without combustible tapes (such as separator tapes like polyester, polypropylene): in case the total
volume of the tape(s) is(are) less than 2 % of the total non-metallic volume, the cables belong to the same
family.
NOTE For the types of tapes that fall under b) and c) it is not possible to mention all different types of materials.
Therefore, only some examples are given.
4.1.1.5 Cable diameter
The nominal tabulated cable diameter, calculated by the producer, shall be used for the selection of the cables
and for classification.
For the tests, the measured cable diameter shall be used.
A difference between the nominal cable diameter calculated by the producer and the measured cable diameter
is acceptable under the condition that the measured cable diameter does not differ more than ± 10 % from this
nominal cable diameter.
NOTE Under this condition, it is acceptable that number of cables in the test is different from the number of cables
calculated on the basis of the nominal diameter.
4.1.1.6 Cable parameter χ
χ is the cable parameter, which shall be rounded to the nearest integer. In case the rounded cable parameter is
the same in all or part of a family, the cables are considered the same and two test samples shall be chosen
according to specific EXAP and at least three according to general EXAP.
The samples to test should be agreed between the manufacturer and the Notified Body and/or testing laboratory.
4.1.2 Product families for power cables
For the application of these EXAP rules and procedures, a cable family shall be defined as follows:
A family of cables is a specific range of products of the same general construction (design elements) and varying
only in conductor size and number of cores.
A change to the conductor construction (rigid or flexible) or form (circular or shaped) or metal (such as copper
or aluminium) shall constitute a different family. EN 60228 Class 1 and Class 2 are rigid conductors and Class 5
and Class 6 are flexible conductors.
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An armour or concentric layer shall not be considered solely as a conductor in determining a product family. An
armoured or a concentric construction shall be considered as a different family to a construction without such
armour or concentric layer. An armour and a concentric conductor are different design elements.
If the cable family falls under one of the generic power cable families:
— armoured cables;
— unarmoured multicore cables;
— single core sheathed cables;
— single core unsheathed cables;
the specific EXAP with safety margin as a function of classification parameter and class may be applied.
4.1.3 Product families for communication cables
For the application of these EXAP rules and procedures, a cable family shall be defined as follows:
A family of cables is a specific range of products of the same general construction (design elements) and varying
only in conductor size and number of conductors.
The cable family shall fall under one of the generic communication cable families:
— U/UTP unscreened overall / unscreened twisted pair;
— F/UTP screened overall / unscreened twisted pair;
— SF/UTP metallic braid and screened overall / unscreened twisted pair;
— U/FTP unscreened overall / screened twisted pair;
— F/FTP screened overall / screened twisted pair;
— S/FTP metallic braid overall / screened twisted pair;
— SF/FTP metallic braid and screened overall / screened twisted pair;
The specific EXAP with safety margin as a function of classification parameter and class may be applied.
4.1.4 Product families for optical fibre cables
For the application of these EXAP rules and procedure, a cable family shall be defined as follows:
A family of cables is a specific range of products of the same general construction (design elements) and varying
only in number of optical fibres and number of units.
The following properties are considered to have a negligible influence on the fire behaviour and therefore
differences in these properties only do not mean that the cables belong to different families:
— fibre glass type;
— fibre type (e.g. single mode or multimode);
The specific EXAP with safety margin as a function of classification parameter and class may be applied.
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5 Specific EXAP for EN 50399 test with safety margin
5.1 Rules for power cables
5.1.1 General
These rules apply for the classification parameters peak HRR, THR, FIGRA, FS, peak SPR and TSP.
These rules apply to circular and non-circular cables within the limits of the EN 50399 test. The EXAP is based
on two tests. The parameter χ is used as a cable parameter.
χ is defined as:
c
χ= V (1)
combust
2
d
where
χ is the cable parameter, which shall be rounded to the nearest integer (see 4.1.1.6);
d is the nominal tabulated cable diameter, in m, (or equivalent diameter for non-
circular cables where the equivalent diameter is defined as the sum of twice the
major and twice the minor axis divided by 3,14 (π));
2
V
is the nominal (calculated) non-metallic volume per meter of ladder, in m ;
combust
c is the number of conductors in one cable.
All cables within the same family with a value of the cable parameter between the lowest and highest value of
the cable parameters of the tested cables are included in the EXAP. Classification is based on the maximum
measured value plus a safety margin:
ν νν+ (2)
class max sm
where
ν is the value used for classification according to respective classification parameter (peak
class
HRR, THR, FIGRA, FS, peak SPR, and TSP);
ν is the maximum, that is the worst, test result of the tests that forms the basis of the
max
EXAP; and
ν is the safety margin required for the particular classification parameter.
sm
The safety margins for the different classes and classification parameters are
...
SLOVENSKI STANDARD
oSIST prEN 50576:2021
01-september-2021
Električni kabli - Razširjena uporaba rezultatov preskusov odziva na ogenj
Electric cables - Extended application of test results for reaction to fire
Erweiterte Anwendung von Prüfergebnissen bezüglich Brandverhalten
Câbles électriques - Application étendue des résultats d'essai pour la réaction au feu
Ta slovenski standard je istoveten z: prEN 50576
ICS:
13.220.40 Sposobnost vžiga in Ignitability and burning
obnašanje materialov in behaviour of materials and
proizvodov pri gorenju products
29.060.20 Kabli Cables
oSIST prEN 50576:2021 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN 50576:2021
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oSIST prEN 50576:2021
EUROPEAN STANDARD DRAFT
prEN 50576
NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2021
ICS 13.220.40; 29.060.20 Will supersede CLC/TS 50576:2016 and all of its
amendments and corrigenda (if any)
English Version
Electric cables - Extended application of test results for reaction
to fire
Câbles électriques - Application étendue des résultats Erweiterte Anwendung von Prüfergebnissen bezüglich
d'essai pour la réaction au feu Brandverhalten
This draft European Standard is submitted to CENELEC members for enquiry.
Deadline for CENELEC: 2021-10-15.
It has been drawn up by CLC/TC 20.
If this draft becomes a European Standard, 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.
This draft European Standard was established by CENELEC 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 CEN-CENELEC Management Centre 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, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to
provide supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.
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
© 2021 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Project: 72460 Ref. No. prEN 50576 E
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11 Contents Page
12 European foreword .4
13 Introduction .5
14 1 Scope .6
15 2 Normative references .6
16 3 Terms and definitions .7
17 4 Extended application of test results (EXAP) .9
18 4.1 Product families for EXAP .9
19 4.1.1 General .9
20 4.1.2 Product families for power cables . 10
21 4.1.3 Product families for communication cable. 11
22 4.1.4 Product families for optical fibre cables . 11
23 5 Specific EXAP for EN 50399 test with safety margin . 11
24 5.1 Rules for power cables . 11
25 5.2 Rules for optical fibre cables . 13
26 5.3 Rules for communication cables . 14
27 6 General EXAP for EN 50399 test for electric cables . 15
28 7 EXAP rule for EN 50399 test for flaming droplets/particles for electric cables . 17
29 8 EXAP rule for EN 60332-1-2 test for classes B2 ,C , and D for electric cables . 18
ca ca ca
30 9 EXAP rule for EN 60332-1-2 test for class E for electric cables . 18
ca
31 10 Direct application rule for EN 60754-2 test for electric cables . 18
32 11 EXAP rule for EN 61034-2 test for electric cables . 19
33 Annex A (informative) An example of flow chart and checklist for specific EXAP . 20
34 A.1 Basic EXAP procedure flow chart . 20
35 A.2 Checklist for specific EXAP . 21
36 Annex B (normative) Rounding of numbers . 22
37 Annex C (informative) Examples to specific and general EXAP . 23
38 C.1 For specific EXAP for EN 50399 test . 23
39 C.2 For general EXAP for EN 50399 test . 23
40 Bibliography . 27
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41 Tables
42 Table 1 — Safety margins v for power cables . 12
sm
43 Table 2 — Allowed range of cable diameters and cable parameters for using safety margins as
44 specified in Table 1 . 12
45 Table 3 — Allowed ranges of d for EXAP applied for larger cables . 13
max
46 Table 4 — Safety margins v for single core unsheathed power cables with a diameter of
sm
47 less than or equal to 5,0 mm . 13
48 Table 5 — Safety margins ν for optical fibre cables . 14
sm
49 Table 6 — Safety margins ν for communication cables . 15
sm
50 Figures
51 Figure A.1 — Flow chart of the EXAP procedure . 20
52 Figure C.1 — Assessment of ν for the classification parameter TSP (theoretical example) . 23
class
53 Figure C.2 — FIGRA results for cable family . 24
54 Figure C.3 — TSP results for cable family . 25
55 Figure C.4 — TSP results for cable family . 26
56
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57 European foreword
58 This document (prEN 50576:2021) has been prepared by CLC/TC 20 “Electric cables”.
59 This document is currently submitted to the Enquiry.
60 The following dates are proposed:
• latest date by which the existence of this (doa) dor + 6 months
document has to be announced at national
level
• latest date by which this document has to be (dop) dor + 12 months
implemented at national level by publication of
an identical national standard or by
endorsement
• latest date by which the national standards (dow) dor + 36 months
conflicting with this document have to be (to be confirmed or
withdrawn modified when voting)
61 This document will supersede CLC/TS 50576:2016 and all of its amendments and corrigenda (if any).
62 This document is expected to be used in conjunction with EN 50575 in order to evaluate the reaction to
63 fire performance of power, control and communication cables.
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64 Introduction
65 The original project “CEMAC – CE marking of cables” was carried out over a three-year period. It brought
66 together cable manufacturers, research and testing laboratories, and research establishments in
67 creating the technical background and developing rules and procedures for extended application of test
68 results (EXAP). More than 200 tests to EN 50399 on more than 100 cables were carried out as part of
69 the project. The final report [1] was published in 2010 and the EXAP rules and procedures developed
70 by the CEMAC project have been used as the basis for this document.
71 A specific EXAP procedure and rules based on the use of safety margins and a cable parameter derived
72 from the extensive CEMAC tests was developed for the most common generic types of power cables
73 used in the European market.
74 A general EXAP procedure and rules based upon a statistical treatment of the actual test results
75 obtained from a cable family was also developed for any power cables. However, the use of this general
76 procedure and rules will generally require more tests to be carried out than the use of the specific
77 procedure and rules.
78 Since the CEMAC project report was completed in 2010, the project has been extended to further
79 investigate the performance of optical fibre cables and rules and procedures developed for extended
80 application of test results for these products. An additional report [2] was published in 2015 and the
81 EXAP rules and procedures developed by the further CEMAC project work was used as the basis for
82 CLC/TS 50576:2016.
83 Since 2016, the project has been extended to further investigate the performance of communication
84 cables and rules and procedures developed for extended application of test results for these products.
85 The work [7] was published in 2016 and has been included in this document.
86 EXAP rule for single core unsheathed power cables has been included [8].
87 In addition, this edition includes editorial improvements and re-arrangements as well as the following
88 significant technical changes with respect to the previous edition:
89 — simplification of the choice of samples to the EXAP rule for EN 60332-1-2 for classes B2 , C
ca ca
90 and D for electric cables;
ca
91 — simplification of the choice of samples due to the changes in the test standard to the EXAP rule for
92 EN 61034-2;
93 — implementation of a direct application rule for EN 60754-2;
94 — improvement of d to the Table 2.
min
95 General guidance on direct and extended application can be found in CEN/TS 15117 [3].
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96 1 Scope
97 This document gives the procedure and rules for extended application of results of tests carried out
98 according to the test methods described in EN 50399, EN 60332-1-2 and EN 61034-2.
99 The EXAP rules described apply to EN 50399 test results used for classification according to
100 EN 13501-6 in classes B2 , C and D , additional smoke production classes s1, s2 and s3 and
ca ca ca
101 flaming droplets/particles, to EN 60332-1-2 test results used for classification in classes B2 , C D
ca ca, ca
102 and E and to EN 61034-2 test results used for classification in classes s1a and s1b.
ca
103 No EXAP procedure and rules have been developed in respect to the results of tests carried out
104 according to the test method described in EN 60754-2. As the parameters (pH and conductivity) for each
105 cable in a family are determined based upon calculation using material test results, this is considered
106 as a matter of direct application. Material test results taken from any one sample of finished cable from
107 a family are sufficient to calculate the parameters for each cable in the family.
108 Cables of diameter 5,0 mm and less are expected to be tested as bundles according to EN 50399.
109 Cables with a diameter of less than or equal to 5,0 mm are included in the specific and general EXAP
110 rules for single core unsheathed power cables only. The rules apply to circular and non-circular cables
111 provided that they fall within the scope of the relevant test method.
112 A specific EXAP rule has been developed for the most common generic power cable families, optical
113 fibre cables and communication cables. A general EXAP rule has been developed for all electric cable
114 families unless otherwise stated elsewhere in this document.
115 NOTE 1 Multicore power cables are sometimes referred to as control cables with a rated voltage but for the
116 purposes of this document are considered as power cables. For multipair, multitriple and multiquad control cables,
117 either the general EXAP rule or the specific EXAP rule for power cables or the specific EXAP rule for communication
118 cables can be applied.
119 The use of the specific EXAP rule gives benefit in the lower number of cables to be tested for a range
120 of cable constructions (product family).
121 An EXAP is only possible when cables belong to a defined family as defined in this document.
122 NOTE 2 For the purposes of this document, the term “electric cables” also covers optical fibre cables.
123 2 Normative references
124 The following documents are referred to in the text in such a way that some or all of their content
125 constitutes requirements of this document. For dated references, only the edition cited applies. For
126 undated references, the latest edition of the referenced document (including any amendments) applies.
127 EN 13501-6, Fire classification of construction products and building elements - Part 6: Classification
128 using data from reaction to fire tests on power, control and communication cables
129 EN 50399, Common test methods for cables under fire conditions - Heat release and smoke production
130 measurement on cables during flame spread test - Test apparatus, procedures, results
131 EN 60332-1-2, Tests on electric and optical fibre cables under fire conditions - Part 1-2: Test for vertical
132 flame propagation for a single insulated wire or cable - Procedure for 1 kW pre-mixed flame
133 (IEC 60332-1-2)
134 EN 60754-2, Test on gases evolved during combustion of materials from cables - Part 2: Determination
135 of acidity (by pH measurement) and conductivity (IEC 60754-2)
136 EN 61034-2, Measurement of smoke density of cables burning under defined conditions - Part 2: Test
137 procedure and requirements (IEC 61034-2)
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138 3 Terms and definitions
139 For the purposes of this document, the following terms and definitions apply.
140 ISO and IEC maintain terminological databases for use in standardization at the following addresses:
141 — ISO Online browsing platform: available at https://www.iso.org/obp
142 — IEC Electropedia: available at https://www.electropedia.org/
143 3.1
144 classification
145 process defined in EN 13501-6, whereby the fire performance parameters obtained from the results of
146 one test, or a set of tests, or from a process of extended application, are compared with limiting values
147 for those parameters that are set as criteria for achieving a certain classification
148 [SOURCE: EN 50575]
149 3.2
150 electric cable
151 all power, control and communication cables, including optical fibre cables and hybrid cables which are
152 a combination of two or more of these cable types
153 [SOURCE: EN 50575]
154 3.3
155 power cable
156 assembly comprising one or more insulated conductor(s), together with any coverings and protective
157 layers, used for the transmission or supply of electrical energy
158 [SOURCE: EN 50575]
159 3.4
160 control cable
161 assembly comprising insulated conductors, together with any coverings and protective layers, used for
162 the transmission of control, measuring and indication signals in electric installations
163 [SOURCE: EN 50575]
164 3.5
165 communication cable
166 assembly of suitably insulated coaxial conductors or twisted pairs of insulated conductors fabricated to
167 meet transmission, mechanical and environmental requirements, and sufficient to allow conveyance of
168 information between two points with the minimum of radiation
169 Note 1 to entry: For this document, only communication cables with copper conductors are considered.
170 [SOURCE: EN 50575]
171 3.6
172 optical fibre cable
173 assembly comprising one or more optical fibres or fibre bundles inside a common covering designed to
174 protect them against mechanical stresses and other environmental influences while retaining the
175 transmission quality of the fibres
176 [SOURCE: IEV 731-04-01]
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177 3.7
178 product family
179 group of products produced by one manufacturer for which the test results for one or more
180 characteristics from one product within the family are considered to be representative for that same
181 characteristic for all other products within this family
182 [SOURCE: EN 50575]
183 3.8
184 extended application of test results
185 EXAP
186 outcome of a process (involving the application of defined rules that may incorporate calculation
187 procedures) that attributes, for a cable family, a test result on the basis of one or more test results to the
188 same test standard
189 3.9
190 heat release rate
191 HRR
192 thermal energy released per unit time by an item during combustion under specified conditions
193 [SOURCE: EN 50399]
194 3.10
195 total heat release
196 THR
197 integrated value of the heat release rate over a defined period
198 [SOURCE: EN 50399]
199 3.11
200 smoke production rate
201 SPR
202 smoke production per unit time
203 [SOURCE: EN 50399]
204 3.12
205 total smoke production
206 TSP
207 integrated value of the smoke production rate over a defined period
208 [SOURCE: EN 50399]
209 3.13
210 flame spread
211 FS
212 propagation of a flame front
213 [SOURCE: EN 50399]
214 3.14
215 fire growth rate index
216 FIGRA
217 highest value of the quotient between HRR and time
218 [SOURCE: EN 50399]
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219 3.15
220 armour
221 covering consisting of a metal tape(s) or wires, generally used to protect the cable from external
222 mechanical defects
223 Note 1 to entry: For the purpose of this document, metallic tape thicker than 0,10 mm thickness is
224 considered an armour.
225 Note 2 to entry: Examples for wire coverings are concentric conductors or braids.
226 [SOURCE: IEV 461-05-06]
227 3.16
228 non-circular cable
229 cable where the measured difference between any two values of the overall diameter of the cable at the
230 same cross-section exceeds 15 % of the largest overall diameter
231 Note 1 to entry: So-called figure of 8 cables, consisting of two single cables connected together (by for
232 instance an extruded bridge) are considered non-circular cables.
233 [SOURCE: EN 50399]
234 4 Extended application of test results (EXAP)
235 4.1 Product families for EXAP
236 4.1.1 General
237 4.1.1.1 Introduction
238 An EXAP is only possible when cables belong to a defined family.
239 The cable family shall be produced by the same manufacturer using the same materials and the same
240 design rules (for instance International standard, National standard, Company standard based on
241 National or International standard), subject to the provisions of 4.1.2 to 4.1.4.
242 NOTE A common design rule is that the thickness of the design elements (for instance insulation and/or sheath
243 thickness) increase with conductor size and cable diameter. These cables, using this common design rule, belong
244 to the same cable family.
245 The full constructional and material details for the family shall be submitted to the certification body prior
246 to the EXAP being applied.
247 4.1.1.2 Colour and marking of design elements
248 A change to the colour of design elements (for instance insulation, fibre and/or sheath) or to the marking
249 on insulation and/or sheath does not constitute a different cable family.
250 4.1.1.3 Centre filler and interstitial fillers
251 It is common that part of the cables in a product range have a centre filler (depending on number of
252 cores and/or cross section) and part of the cables in that product range are without centre filler.
253 In case the volume of the centre filler is equal or less than 10 % of the total non-metallic volume, then
254 the same cable with the centre filler belongs to the family of cable’s without a centre filler (on the
255 condition that all other requirements of this document are fulfilled).
256 In case the volume of the centre filler is greater than 10 % of the total non-metallic volume constitutes a
257 different family from the cables without centre filler.
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258
The volume of the centre filler shall in any case be taken into account in the calculation of the cable
259 parameter
260 For cables with and without interstitial fillers, other than centre filler and/or filling compound, the cables
261 are considered to belong to different product families.
262 4.1.1.4 Tapes
263 Cables with or without tapes are to be treated as follows
264 a) With/without metallic or metallized tape: different families
265 b) With/without non-combustible tapes (such as mica tapes and glass tapes): different family
266 c) With/without combustible tapes (such as separator tapes like polyester, polypropylene): in case
267 the volume of the tape(s) is/are less than 2 % of the total non-metallic volume, the cables belong to
268 the same family
269 NOTE For the types of tapes that fall under b) and c) it is not possible to mention all different types of materials,
270 therefore only some examples are given.
271 4.1.1.5 Cable diameter
272 The nominal tabulated cable diameter, calculated by the producer, shall be used for the selection of the
273 cables and for classification.
274 For the tests, the measured cable diameter shall be used.
275 A difference between the nominal cable diameter calculated by the producer and the measured cable
276 diameter is acceptable under the condition that the measured cable diameter does not differ more
277 than ± 10 % from this nominal cable diameter.
278 NOTE Under this condition, it is acceptable that number of cables in the test is different from the number of
279 cables calculated on the basis of the nominal diameter
280 4.1.2 Product families for power cables
281 For the application of these EXAP rules and procedures, a cable family shall be defined as follows:
282 A family of cables is a specific range of products of the same general construction (design elements)
283 and varying only in conductor size and number of cores.
284 A change to the conductor construction (rigid or flexible) or form (circular or shaped) or metal (such as
285 copper or aluminium) shall constitute a different family. EN 60228 Class 1 and Class 2 are rigid
286 conductors and Class 5 and Class 6 are flexible conductors.
287 An armour or concentric layer shall not be considered solely as a conductor in determining a product
288 family. An armoured or a concentric construction shall be considered as a different family to a
289 construction without such armour or concentric layer. An armour and a concentric conductor are different
290 design elements.
291 If the cable family falls under one of the generic power cable families:
292 — armoured cables;
293 — unarmoured multicore cables;
294 — single core sheathed cables;
295 — single core unsheathed cables;
296 the specific EXAP with safety margin as a function of classification parameter and class may be applied.
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297 4.1.3 Product families for communication cable
298 For the application of these EXAP rules and procedure, a cable family shall be defined as follows:
299 A family of cables is a specific range of products of the same general construction (design elements)
300 and varying only in conductor size and number of conductors.
301 The cable family shall fall under one of the generic communication cable families:
302 — U/UTP unscreened overall / unscreened twisted pair;
303 — F/UTP screened overall / unscreened twisted pair;
304 — SF/UTP metallic braid and screened overall / unscreened twisted pair;
305 — U/FTP unscreened overall / screened twisted pair;
306 — F/FTP screened overall / screened twisted pair;
307 — S/FTP metallic braid overall / screened twisted pair;
308 — SF/FTP metallic braid and screened overall / screened twisted pair.
309 4.1.4 Product families for optical fibre cables
310 For the application of these EXAP rules and procedure, a cable family shall be defined as follows:
311 A family of cables is a specific range of products of the same general construction (design elements)
312 and varying only in number of optical fibres and number of units.
313 The following properties are considered to have a negligible influence on the fire behaviour and therefore
314 differences in these properties only do not mean that the cables belong to different families:
315 — Fibre glass type;
316 — Fibre type (e.g. single mode or multimode);
317 5 Specific EXAP for EN 50399 test with safety margin
318 5.1 Rules for power cables
319 These rules apply for the classification parameters peak HRR, THR, FIGRA, FS, peak SPR and TSP.
320 These rules apply to circular and non-circular cables within the limits of the EN 50399 test. The EXAP
321 is based on two tests. The parameter χ is used as a cable parameter.
322 χ is defined as:
c
323 χ= V (1)
combust
2
d
324 where
χ is the cable parameter, which shall be rounded to the nearest integer
d is the nominal tabulated cable diameter, in m, (or equivalent diameter for non-
circular cables where the equivalent diameter is defined as the sum of twice the
major and twice the minor axis divided by 3,14 (π));
V 2
combust is the nominal (calculated) non-metallic volume per meter of ladder, in m ;
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oSIST prEN 50576:2021
prEN 50576:2021 (E)
c is the number of conductors in one cable
325 All cables within the same family with a value of the cable parameter between the lowest and highest
326 value of the cable parameters of the tested cables are included in the EXAP, in case the cable parameter
327 are identical the cables are considered the same. Classification is based on the maximum measured
328 value plus a safety margin:
329 ν νν+ (2)
class max sm
330 where
ν is the value used for classification according to respective classification parameter (peak
class
HRR, THR, FIGRA, FS, peak SPR, and TSP);
ν is the maximum, that is the worst, test result of the tests that forms the basis of the
max
EXAP; and
ν is the safety margin required for the particular classification parameter
sm
331 The safety margins for the different classes and classification parameters are given in Table 1.
332 Table 1 — Safety margins v for power cables
sm
Classification Dimension Class
parameter
B2 C D s1 s2
ca ca ca
Peak HRR [kW] 3 6 40
THR [MJ] 1,5 3 7
FIGRA −1 15 30 130
[Ws ]
v
sm
Flame spread [m] 0,15 0,2
Peak SPR 2 −1 0,05
...
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