SIST EN 50266-2-3:2002
(Main)Common test methods for cables under fire conditions - Test for vertical flame spread of vertically-mounted bunched wires or cables - Part 2-3: Procedures - Category B
Common test methods for cables under fire conditions - Test for vertical flame spread of vertically-mounted bunched wires or cables - Part 2-3: Procedures - Category B
Supersedes HD 405.3 together with EN 50266-1 * Corrigendum to EN issued March 2002
Allgemeine Prüfverfahren für Kabel und isolierte Leitungen im Brandfall - Prüfung der senkrechten Flammenausbreitung von senkrecht angeordneten Bündeln von Kabeln und isolierten Leitungen - Teil 2-3: Prüfverfahren - Prüfart B
Méthodes d'essai communes aux câbles soumis au feu - Essai de propagation verticale de la flamme des fils ou câbles en nappes en position verticale - Partie 2-3: Procédures - Catégorie B
Splošne metode za preskušanje kablov v požarnih razmerah - Preskus pri navpičnem širjenju ognja po navpično nameščenih žičnih kitah ali kablih - 2-3. del: Postopki - Kategorija B
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Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 50266-2-3:2002
01-april-2002
1DGRPHãþD
SIST HD 405.3 S1:1999
6SORãQHPHWRGH]DSUHVNXãDQMHNDEORYYSRåDUQLKUD]PHUDK3UHVNXVSUL
QDYSLþQHPãLUMHQMXRJQMDSRQDYSLþQRQDPHãþHQLKåLþQLKNLWDKDOLNDEOLKGHO
3RVWRSNL.DWHJRULMD%
Common test methods for cables under fire conditions - Test for vertical flame spread of
vertically-mounted bunched wires or cables - Part 2-3: Procedures - Category B
Allgemeine Prüfverfahren für Kabel und isolierte Leitungen im Brandfall - Prüfung der
senkrechten Flammenausbreitung von senkrecht angeordneten Bündeln von Kabeln und
isolierten Leitungen - Teil 2-3: Prüfverfahren - Prüfart B
Méthodes d'essai communes aux câbles soumis au feu - Essai de propagation verticale
de la flamme des fils ou câbles en nappes en position verticale - Partie 2-3: Procédures -
Catégorie B
Ta slovenski standard je istoveten z: EN 50266-2-3:2001
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 50266-2-3:2002 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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EUROPEAN STANDARD EN 50266-2-3
NORME EUROPÉENNE
EUROPÄISCHE NORM February 2001
ICS 13.220.40; 29.020; 29.060.20 Supersedes HD 405.3 S1:1993
English version
Common test methods for cables under fire conditions -
Test for vertical flame spread of
vertically-mounted bunched wires or cables
Part 2-3: Procedures - Category B
Méthodes d'essai communes aux câbles Allgemeine Prüfverfahren für Kabel und
soumis au feu - Essai de propagation isolierte Leitungen im Brandfall - Prüfung
verticale de la flamme des fils ou câbles der senkrechten Flammenausbreitung von
en nappes en position verticale senkrecht angeordneten Bündeln von
Partie 2-3: Procédures - Catégorie B Kabeln und isolierten Leitungen
Teil 2-3: Prüfverfahren - Prüfart B
This European Standard was approved by CENELEC on 2000-08-01. CENELEC members are bound to
comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the Central Secretariat or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any
other language made by translation under the responsibility of a CENELEC member into its own
language and notified to the Central Secretariat has the same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic,
Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway,
Portugal, Spain, Sweden, Switzerland and United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Central Secretariat: rue de Stassart 35, B - 1050 Brussels
© 2001 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 50266-2-3:2001 E
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EN 50266-2-3:2001 - 2 -
Foreword
This European Standard was prepared by Working Group 10 of the Technical Committee CENELEC
TC 20, Electric cables.
When used in conjunction with EN 50266-1 this European Standard supersedes HD 405.3 S1 in respect
of test category B.
All pre-existing categories of test from HD 405.3 S1 have been retained and updated in the different
parts 2. A new category (Category D) has been added to cater for testing at very low non-metallic
volumes.
The description of the apparatus given in EN 50266-1 updates that in HD 405.3 S1.
The text of the draft was submitted to the Unique Acceptance procedure and was approved by
CENELEC as EN 50266-2-3 on 2000-08-01.
The following dates were fixed:
- latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2001-08-01
- latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2003-08-01
Annexes designated 'normative' are part of the body of the standard.
Annexes designated 'informative' are given for information only.
In this standard, annex A is normative and annex B is informative.
__________
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- 3 - EN 50266-2-3:2001
Contents
Page
Introduction.4
1 Scope.5
2 Normative references.5
3 Definitions.5
3.1 Ignition source.5
3.2 Char.5
3.3 Flame spread .5
4 Test apparatus .6
4.1 General .6
4.2 Ignition source.6
5 Test procedure.6
5.1 Test sample .6
5.2 Determination of number of test pieces .6
5.3 Mounting of the test sample .7
5.4 Flame application time .7
6 Evaluation of test results.7
7 Performance requirements.8
8 Retest procedure.8
9 Test report.8
Annex A (normative) Guidance on cable selection for type approval testing.10
Annex B (informative) Recommended performance requirements.11
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EN 50266-2-3:2001 - 4 -
Introduction
Methods of test for flame spread characteristics for a single vertical insulated wire or cable are given in
EN 50265, but it cannot be assumed that, because a cable or wire meets the requirements of that
standard, a vertical bunch of similar cables or wires will behave in a similar manner. This is because
flame spread along a vertical bunch of cables depends on a number of features, such as:
a) the volume of combustible material exposed to the fire and to any flame which may be produced
by the combustion of the cables;
b) the geometrical configuration of the cables and their relationship to an enclosure;
c) the temperature at which it is possible to ignite the gases emitted from the cables;
d) the quantity of combustible gas released from the cables for a given temperature rise;
e) the volume of air passing through the cable installation;
f) the construction of the cable, e.g. armoured or unarmoured, multi or single core.
All of the foregoing assume that the cables are able to be ignited when involved in an external fire.
EN 50266 gives details, in various parts, of a test where a number of cables are bunched together to
form various test sample installations. For easier use and differentiation of the apparatus and the
various test categories, the parts are designated as follows:
Part 1 Apparatus
Part 2-1 Category A F/R
Part 2-2 Category A
Part 2-3 Category B
Part 2-4 Category C
Part 2-5 Category D
Parts from 2-1 onwards define the various categories and the relevant procedures. The categories are
distinguished by test duration, the volume of non-metallic material of the test sample and the method of
mounting the sample for the test. In all categories, cables having at least one conductor of cross-
sectional area greater than 35 mm² are tested in a spaced configuration, whereas cables of conductor
cross-sectional area of 35 mm² or smaller are tested in a touching configuration.
The categories are not necessarily related to different safety levels in actual cable installations. The
actual installed configuration of the cables may be a major determinant in the level of flame spread
occurring in an actual fire.
The method of mounting described as Category A F/R (part 2-1) is intended for special cable designs
used in particular installations.
Categories A, B, C and D (parts 2-2 to 2-5 respectively) are for general use where different non-metallic
volumes are applicable.
Additional categories, especially to cover the use of small diameter communication cables in closely
bunched configurations, will be further considered when more data is available.
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- 5 - EN 50266-2-3:2001
1 Scope
EN 50266 specifies methods of test for the assessment of vertical flame spread of vertically-mounted
bunched wires or cables, electrical or optical, under defined conditions.
NOTE For the purpose of this standard the term ‘electric wire or cable’ covers all insulated metallic conductor cables used for the
conveyance of energy or signals.
The test is intended for type approval testing. The requirements for the selection of cables for testing are
given in annex A. The flame spread is measured as the extent of damage of the cable sample. This
procedure may be used to demonstrate the cable’s ability to limit flame spread.
This part 2-3 covers Category B and relates to cables installed on the test ladder to achieve a nominal
total volume of non-metallic material of 3,5 litres per metre of test sample. The flame application time is
40 min. The method of mounting uses the front of the standard ladder. The category is intended for
general use where medium volumes of non-metallic material are required to be evaluated.
A recommended performance
...
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