SIST-TS CLC/TS 50576:2017
(Main)Electric cables - Extended application of test results for reaction to fire
Electric cables - Extended application of test results for reaction to fire
This Technical Specification 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.
Cables of diameter 5,0 mm and less should be tested as bundles according to EN 50399 and are excluded from these rules. 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 and optical fibre cables. 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 with more than 5 cores are sometimes referred to as control cables with a rated voltage but for the purposes of this standard are considered as power cables.
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 Technical Specification.
NOTE 2 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.
Kabel und Leitungen - Erweiterte Anwendung von Prüfergebnissen
Diese Technische Spezifikation gibt die Verfahren und Regeln wieder für die erweiterte Anwendung von Ergebnissen aus Prüfungen, die nach den in EN 50399, EN 60332 1 2 und/oder EN 61034-2 beschriebenen Prüfverfahren durchgeführt wurden.
Die hierin beschriebenen EXAP-Regeln gelten für nach EN 50399 erhaltene Prüfergebnisse für die Einstufung in die Klassen B2ca, Cca und Dca sowie die zusätzlichen für die Rauchentwicklung geltenden Klassen s1, s2 und s3 und bren¬nendes 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.
Kabel und Leitungen mit einem Durchmesser von bis zu 5,0 mm sollten als Bündel nach EN 50399 geprüft werden und sind von diesen Regeln ausgenommen. Kabel- und Leitungsbündel nach Anwendung der EN 50399 Prüfergebnisse fallen nicht unter die EXAP-Regeln.
Die Regeln gelten für runde und nichtrunde Kabel und Leitungen vorausgesetzt sie fallen in den Anwendungsbreich der jeweiligen Prüfmethode.
Für die gebräuchlichsten Familien von Starkstromkabeln und -leitungen und Glasfaserkabeln wurde eine spezielle EXAP-Regel erarbeitet. Darüber hinaus wurde eine allgemeine EXAP-Regel entwickelt, die sich auf alle Familien von Starkstromkabel- und -leitungen anwenden lässt. Die allgemeine EXAP-Regel gilt nicht für Kommunikationskabel oder Glasfaserkabel.
ANMERKUNG 1 Mehradrige Starkstromkabel und -leitungen mit mehr als 5 Adern werden manchmal auch als Steuerkabel mit einer Nennspannung bezeichnet, werden aber für die Anwendung dieser Norm als Starkstromkabel und –leitungen angesehen.
Die allgemeine EXAP-Regel kann auf Hybridkabel angewendet werden vorausgesetzt, dass die Bedingungen aus 6.1 erfüllt sind.
Für Kommunikationskabel und Glasfaserkabel wurde bis zum Zeitpunkt der Veröffentlichung dieser TS keine EXAP-Regeln entwickelt.
Die Anwendung der speziellen EXAP-Regel hat den Vorteil, dass für eine bestimmte Gruppe von Kabel¬- und 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 der vorliegenden Technischen Spezifikation gehören.
ANMERKUNG 2 Es wurden kein EXAP-Verfahren und 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 oder 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 von Kabeln in einer Familie sind die Ergebnisse aus Materialprüfungen eines Musters eines fertig produzierten Kabels aus der Familie ausreichend.
Câbles électriques - Application étendue des résultats d'essai
La présente Spécification technique donne les procédures et règles relatives à l'application étendue des résultats d'essais réalisés selon les méthodes d'essai décrites dans l'EN 50399, l'EN 60332 1 2 et l'EN 61034 2.
Les règles d’EXAP décrites s'appliquent aux résultats d'essai de l'EN 50399 utilisés pour le classement en classes B2ca, Cca et Dca, en classes supplémentaires d'émission de fumée s1, s2 et s3 et de particules/gouttelettes enflammées, de l'EN 60332 1 2 utilisés pour le classement en classes B2ca,Cca, Dca et Eca et de l'EN 61034 2 utilisés pour le classement en classes s1a et s1b.
Il convient que les câbles de diamètre inférieur ou égal à 5,0 mm soient soumis à essai assemblés en faisceau, conformément à l'EN 50399. Les câbles en faisceau ne sont pas inclus dans les règles d’EXAP s'appliquant aux résultats d'essai de l'EN 50399.
Les règles s'appliquent aux câbles circulaires et non circulaires, sous réserve qu'ils entrent dans le domaine d'application de la méthode d'essai correspondante.
Une règle d’EXAP spécifique a été développée pour les familles génériques de câbles d'énergie les plus courantes et les câbles à fibres optiques. Une règle d’EXAP générale a été développée pour toutes les familles de câbles d'énergie. La règle d’EXAP générale ne s'applique pas aux câbles de communication ou aux câbles à fibres optiques.
NOTE 1 Les câbles d'énergie multiconducteurs possédant plus de 5 conducteurs sont parfois appelés câbles de commande à tension assignée, mais pour les besoins de la présente Spécification technique, ils sont considérés comme des câbles d'énergie.
La règle d’EXAP générale peut être appliquée dans le cas des câbles hybrides, sous réserve que les conditions de 6.1 soient satisfaites.
L'utilisation de la règle d’EXAP spécifique présente un avantage pour un faible nombre de câbles à soumettre à essai faisant partie d'une gamme de câbles de différentes constructions (famille de produits).
Une EXAP n'est possible que lorsque les câbles appartiennent à une famille définie, comme cela est précisé dans la présente Spécification technique.
NOTE 2 Aucune procédure ni règle d’EXAP n'a été développée en fonction des résultats des essais réalisés conformément à la méthode d'essai décrite dans l'EN 60754-2. Les paramètres (pH et conductivité) de chaque câble d'une famille étant déterminés en fonction des calculs reposant sur les résultats des essais de matériau, ils sont considérés comme une application directe. Les résultats des essais de matériau provenant d'un échantillon de câble d'une famille sont suffisants pour calculer les paramètres pour chaque câble de la famille.
Električni kabli - Razširjena uporaba rezultatov preskusov odziva na ogenj
Ta tehnična specifikacija 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.
Kabli premera 5,0 mm in manj morajo biti preskušeni v snopih v skladu s standardom EN 50399 in so izvzeti iz teh pravil. 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 in optične kable je bilo pripravljeno posebno pravilo razširjene uporabe. Za vse družine napajalnih kablov je bilo pripravljeno splošno pravilo razširjene uporabe. Splošno pravilo razširjene uporabe se ne uporablja za komunikacijske ali optične kable.
OPOMBA 1: Večjedrni napajalni kabli z več kot 5 jedri se včasih imenujejo krmilni kabli z nazivno napetostjo, vendar se za namene tega standarda obravnavajo kot napajalni kabli.
Splošno pravilo razširjene uporabe se lahko uporablja v primeru hibridnih kablov, če so izpolnjeni pogoji iz točke 6.1.
Uporaba posebnega pravila razširjene uporabe omogoča manjše število kablov, ki jih je treba preskusiti, za več konstrukcij kablov (družina proizvodov).
Razširjena uporaba je mogoče le, kadar kabli pripadajo določeni družini, kot je opredeljeno v tej tehnični specifikaciji.
OPOMBA 2: V zvezi z rezultati preskusov, izvedenih v skladu s preskusnimi metodami, opisanimi 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 na katerem koli vzorcu dokončanega kabla iz družine.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST-TS CLC/TS 50576:2017
01-februar-2017
1DGRPHãþD
SIST-TS CLC/TS 50576:2014
(OHNWULþQLNDEOL5D]ãLUMHQDXSRUDEDUH]XOWDWRYSUHVNXVRYRG]LYDQDRJHQM
Electric cables - Extended application of test results for reaction to fire
Kabel und Leitungen - Erweiterte Anwendung von Prüfergebnissen
Câbles électriques - Application étendue des résultats d'essai
Ta slovenski standard je istoveten z: CLC/TS 50576:2016
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-TS CLC/TS 50576:2017 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST-TS CLC/TS 50576:2017
TECHNICAL SPECIFICATION CLC/TS 50576
SPÉCIFICATION TECHNIQUE
TECHNISCHE SPEZIFIKATION
December 2016
ICS 13.220.40; 29.060.20 Supersedes CLC/TS 50576:2014
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 Prüfergebnissen
This Technical Specification was approved by CENELEC on 2016-10-10.
CENELEC members are required to announce the existence of this TS in the same way as for an EN and to make the TS available promptly
at national level in an appropriate form. It is permissible to keep conflicting national standards in force.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2016 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. CLC/TS 50576:2016 E
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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 . 9
4.1.3 Product families for communication cable. 9
4.1.4 Product families for optical fibre cables . 10
4.2 Specific and general EXAP . 10
5 Specific EXAP with safety margin for power cables . 10
5.1 Rules for specific EXAP for EN 50399 test . 10
5.2 Extension to cables larger than the tested range . 13
6 General EXAP for power cables . 14
6.1 Rules for general EXAP for EN 50399 test . 14
6.2 Example of use of general EXAP (FIGRA) where m = 1 . 16
6.3 Example of use of general EXAP (TSP) where m = 1 . 17
6.4 Example of use of general EXAP (TSP) where m is less than 1 . 18
7 Specific EXAP with safety margin for optical fibre cables . 19
7.1 Rules for specific EXAP for EN 50399 test . 19
8 EXAP rule for EN 50399 test for flaming droplets/particles for power, control and
communication (copper or optical fibre) cables . 20
9 EXAP rule for EN 60332-1-2 test for classes B2 ,C , and D for power, control and
ca ca ca
communication (copper or optical fibre) cables . 20
10 EXAP rule for EN 60332-1-2 test for class E for power, control and communication
ca
(copper or optical fibre) cables . 21
11 EXAP rule for EN 61034-2 test for classes s1a and s1b for power, control and
communication (copper or optical fibre) cables . 22
Annex A (informative) Flow chart and checklist for specific EXAP for power cables . 23
A.1 Basic EXAP procedure flow chart . 23
A.2 Checklist for specific EXAP . 24
Annex B (normative) Rounding of numbers . 25
Annex C (informative) Background information on EN 60332-1-2 and EN 61034-2 testing . 26
C.1 Background information regarding EN 60332-1-2 testing . 26
C.2 Background information regarding EN 61034-2 testing . 26
Bibliography . 28
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Tables
Table 1 — Safety margins v for power cables. 11
sm
Table 2 — Allowed range of cable diameters and cable parameters for using safety
margins as specified in Table 1 . 12
Table 3 — Allowed ranges of d for EXAP applied for larger cables . 13
max
Table 4 — Safety margins ν for optical fibre cables . 20
sm
Table C.1 — Time for flame application . 26
Table C.2 — Number of test pieces for EN 61034–2 . 27
Table C.3 — Evaluation of EN 61034–2 tests on product families . 27
Figures
Figure 1 — Assessment of ν for the classification parameter TSP (theoretical
class
example) . 13
Figure 2 — FIGRA results for cable family . 17
Figure 3 — TSP results for cable family . 18
Figure 4 — TSP results for cable family . 19
Figure A.1 — Flow chart of the EXAP procedure . 23
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European foreword
This document (CLC/TS 50576:2016) has been prepared by CLC/TC 20 “Electric cables”.
The following date is proposed:
· latest date by which the existence of (doa) [2017-04-10]
this document has to be announced
at national level
This document supersedes CLC/TS 50576:2014.
This document has been prepared under a mandate given to CENELEC by the European Commission
and the European Free Trade Association.
This document is meant to be used in conjunction with EN 50575 in order to evaluate the reaction to
fire performance of power, control and communication cables.
NOTE For the purposes of this Technical Specification, the term 'electric cables' also covers optical fibre
cables.
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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 Technical Specification.
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 have been used as the
basis for the 2016 revision of this Technical Specification.
General guidance on direct and extended application may be found in CEN/TS 15117 [3].
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1 Scope
This Technical Specification 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 B2 ,C
ca ca
, additional smoke production classes s1, s2 and s3 and flaming droplets/particles, to
and D
ca
,C D and E and to EN 61034-2
EN 60332-1-2 test results used for classification in classes B2
ca ca, ca ca
test results used for classification in classes s1a and s1b.
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 and
optical fibre cables. 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 with more than 5 cores are sometimes referred to as control cables with a
rated voltage but for the purposes of this Technical Specification are considered as power cables.
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 Technical
Specification.
NOTE 2 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.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
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 61034-2, Measurement of smoke density of cables burning under defined conditions - Part 2: Test
procedure and requirements (IEC 61034-2)
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3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
classification
process defined in EN 13501, 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
[SOURCE: EN 15725]
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]
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
Note 1 to entry: May also contain metallic conductors.
[SOURCE: IEV 731-04-01]
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]
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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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4 Extended application of test results (EXAP)
4.1 Product families for EXAP
4.1.1 General
An EXAP is only possible when cables belong to a defined family.
The full constructional and material details for the family shall be submitted to the certification body
prior to the EXAP being applied.
A change to the colour of design elements (for instance insulation and/or sheath) or to the marking on
insulation and/or sheath does not constitute a different cable family.
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 voltage rating.
A change to the conductor construction (rigid or flexible) or form (circular or shaped) shall constitute a
different family. EN 60228 Class 1 and Class 2 are rigid conductors and Class 5 and Class 6 are
flexible conductors.
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.
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) and varying only in conductor size and number of cores.
NOTE 1 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.
If the cable family falls under one of the generic power cable families:
— single core unsheathed;
— single core sheathed (unarmoured);
— multicore sheathed (unarmoured);
— armoured single or multicore;
the specific EXAP with safety margin as a function of classification parameter and class may be
applied.
NOTE 2 Concentric constructions are considered as part of the generic armoured family.
4.1.3 Product families for communication cable
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 conductors and number of units.
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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).
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.
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 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).
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);
— Fibre colour.
4.2 Specific and general EXAP
A specific EXAP rule has been developed for the most common generic power cable and optical fibre
cable families and a general EXAP rule has been developed for other power cable families.
The use of the specific EXAP rule gives benefit in the lower number of cables to be tested for a range
of cable constructions in a product family.
5 Specific EXAP with safety margin for power cables
5.1 Rules for specific EXAP for EN 50399 test
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.
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χ is defined as:
c
c= V (1)
2 combust
d
where
d
is the 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 non-metallic volume per meter of ladder, in m ;
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 =ν +ν (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 EXAP;
max
and
ν is the safety margin required for the particular classification parameter.
sm
The safety margins for the different classes and classification parameters are given in Table 1.
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
−1
FIGRA [Ws ] 15 30 130
v
sm
Flame spread [m] 0,15 0,2
2 −1
Peak SPR [m s ] 0,05 0,3
2
TSP [m ] 10 80
These safety margins can be applied to cables with a cable diameter and cable parameter within the
ranges indicated in Table 2. For larger cables, see 5.2.
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Table 2 — Allowed range of cable diameters and cable parameters
for using safety margins as specified in Table 1
d [mm] d [mm] χ χ
min max min max
Armoured 10,0 (>5,0) 62,0 2 82
Unarmoured 9,0 (>5,0) 52,0 4 73
multicore
Single core 6,0 (>5,0) 29,0 2 20
sheathed
Single core > 5,0 25,0 2 115
unsheathed
The values (>5,0) mm given in the d column are only applicable in the case where the flame spread
min
for the tested cables with diameters less than those given without parentheses is less than 3,3 m, i.e.
if the cables are not fully combusted.
Cables with a diameter of less than or equal to 5,0 mm, shall be bundled according to EN 50399.
Bundled cables are not included in the specific EXAP rules as the fire performance changes
dramatically with the change of mounting. Therefore these cables need to be tested case by case.
Diameters shall be expressed in mm to one decimal place. Cable parameters shall be calculated and
the value rounded to the integer according to Annex B.
Figure 1 shows a theoretical example indicating how ν for the classification parameter TSP is
class
assessed for a typical cable family. Tests are performed for cables with χ = 10 and with χ = 50. The
2 2
maximum result is TSP = 300 m which is obtained for χ = 50. Therefore ν = 300 m . ν for TSP
max sm
2 2
Class s2 is 80 m according to Table 1. The value for classification would be ν = 300 m +
class
2 2 2
80 m = 380 m . This is below the limit 400 m for smoke Class s2. Therefore, for TSP, all cables in
the family with 10 ≤ χ ≤ 50 can be considered to fulfil the requirement for Class s2. In order to classify
the cables as s2 they would also need to fulfil the requirements for s2 for peak SPR.
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Figure 1 — Assessment of ν for the classification parameter TSP
class
(theoretical example)
A checklist for the use of the specific EXAP rules is given in Annex A.
5.2 Extension to cables larger than the tested range
Power cables larger than the CEMAC tested range are not included in the applicable range for safety
margins in Table 2. However, it has been shown that, provided not all cables within a family are
completely combusted, reaction to fire performance is better for larger cables than for smaller cables.
There is, therefore, a possibility for EXAP based on extrapolation to larger diameters for cable families
listed in Table 2. The condition for this extrapolation is that fire performance actually improves with
increasing diameter which is fulfilled if the classification for a large diameter cable is B2 or C .
ca ca
If a cable with diameter d in the range given in Table 3 is tested and classified B2 or C then all
max ca ca
cables with d > d can be classified according to the result for the tested cable with diameter d .
max max
Table 3 — Allowed ranges of d for EXAP applied for larger cables
max
Armoured cables d = 56,0 to 62,0 mm
max
Unarmoured multicore cables d = 47,0 to 52,0 mm
max
Single core sheathed cables d = 26,0 to 29,0 mm
max
Single core unsheathed cables d = 22,0 to 25,0 mm
max
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6 General EXAP for power cables
6.1 Rules for general EXAP for EN 50399 test
These rules apply for the classification parameters peak HRR, THR, FIGRA, FS, peak SPR and TSP.
For cable types not belonging to any of the cable families defined by Table 2, no safety margins have
been determined. For such cables safety margins can be generated from the test results of the tested
cables. In this case at least three cables shall be tested.
The general EXAP is also based on the cable parameter χ. Therefore the cables in the cable family
need a well-defined diameter which means that the cable cross section shall be circular or non-circular
within the limits defined in EN 50399. Furthermore the cables need a well-defined non-zero number of
metallic conductors. As a result, the general EXAP rules can only be applied for power cable families
having at least one metallic conductor. For other type of cable families it is not possible to carry out an
EXAP.
The safety margin ν is a function that:
sm
— increases with increased dispersion of the measured values;
— increases with increased range of the cable parameter χ;
— decreases with increased number of tests; and
— decreases with increased monotonicity of the measured values.
The safety margin shall be calcul
...
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