Bsi bs en 50267 1 1999 scan

~ STD BSI BS EN 502b7 1 ENGL L779 lb 2 q b b 9 0775LqL 528 m BRITISH STANDARD Common test methods for cables under fire conditions Tests on gases evolved during combustion of materials from cables Par[.]

S T D - B S I B S E N 5 0 2 b 7 - 1 - E N G L L779 l b 2 q b b 9 0775LqL 528 m

BRITISH STANDARD

Common test methods

for cables under fire

gases evolved during

Part 1: Apparatus

The European Standard EN 50267-1:1998 has the status of a

British Standard

ICs 13.220.40 29.060.20

NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHI LAW

BS EN

50267-1: 1999

````-`-`,,`,,`,`,,` -BS EN 50267-k1999

National foreword

been prepared under the

direction of the Elecîxotechnicai

Sector Committee, was published

under the authority of the

Standards Committee and comes

into effect on 15 September 1999

>

O BSI 09-1999

ISBN O 680 32732 9

This British Standard is the English ianguage version of EN 50267-1: 1998 When

combined with BS EN 50267-2-1, it supersedes BS 64251:lW which is withdrawn

withdrawn

GEYZO, Electric cables, to Subcommittee GELJ20/3, insuiaiion and sheath, which

D a Comments

- monitor reiated intemational and European developments and promulgate

A list of organizatjons represented on this subcommittee can be obtained on request

Cross-references

Compliance with a British Standard does not of itself confer immunity from legal obligations

Summary of pages

was last issued

````-`-`,,`,,`,`,,` -S T D - B ````-`-`,,`,,`,`,,` -S I B ````-`-`,,`,,`,`,,` -S EN 502b7-1-ENGL 1999 l b 2 9 b b î 0 7 9 5 1 4 3 3 T O =

EUROPEAN STANDARD

NORME EUROPÉENNE

EUROPÄISCHE NORM

EN 50267-1

June 1998

ICs 13.220.40; 29.060.20

Descriptors: Electrical installation, electric cables, fire tests, combustion tests, combustion products,

burning gases, corrosive gases, determination, acidity, corrosivity, test equipment

English version

Common test methods for cables under fire conditions Tests on gases evolved during combustion of materials from cables

Part 1: Apparatus

d'un materiau preleve sur un câble

Verhalten von Kabeln und isolierten Leitungen im

Werkstoffe von Kabeln und isolierten Leitungen entstehenden Gase

Teil 1: Prüfgerät

comply with the CENKENELEC Internal Regulations which stipulate the conditions for giving this European

S u d a r d the status of a national standard without any alteration

"-tv date lists and bibliographical references concerning such national standards may be obtained on

luropean Standard exists in three official versions (English, French, German) A version in any other

larsguage 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

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 f i r Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B-1050 Brussels

````-`-`,,`,,`,`,,` -Page 2

EN 50267-1:1998

Foreword

EN 50267-1 on 1998-04-01

The following dates were fuced:

level by publication of an identical national standard or by

Contents

Page

O BSI 09- I999

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Page 3

EN 50267-1~1998

1 Scope

EN 50267-1 specifies apparatus suitable for use with procedures for the quantitative determination of gases,

especially acidic and corrosive gases, evolved when non-metallic materials taken from cables are subject to

combustion

2 Normative references

EN 60695-4, Fire hazard testing - Part 4: Terminology concerningjre tests

NOTE IEC 60695 is in the CWISC of re-nurnbning its parts and sections This will also affect the equivalent ENS

3 Definition

3.1

combustion

and/or glowing and/or emission of smoke

4 Test apparatus

4.1 General

The assembly of the components which constitute the test apparatus shall be leak-tight, The connecting distances

between the tube and the first wash bottle and between the first and the second wash bottle shall be as short as

possible Glass or silicone rubber tubing shall be used for these connections

N O T E At the exit side of the tube as close to the end as possible, it is permitted to place a plug of silica wool (typically weighing

about 3 g) to aid collection of condensates

approximately concentric to the tube furnace

initial clearance should allow for thermal expansion

dimensions:

O BSI 09-1999

````-`-`,,`,,`,`,,` -Page 4

EN 50267-1:1998

only be used three times before firing or renewing

4.5 Bubbling devices for gases

example of a wash bottle is shown in Figure 2.)

5 mm, also to aid better absorption

NOTE The derivation of the required flow rate of air to give the specified speed of air is:

where

D

p

Y

is the internai diameter of $e tube (mrn);

is the flow rate in air (mi+

is the speed of air (mi.mm*”i-’)

The air supply, which shall be derived from a high purity source, shall be adjusted and controlled by a needle

Method 1 ‘ ’

tube (See Figure 3.)

Method 2’ ’

Method 3”

’ ) The operator should take precautions i.e the wearing of eye protection and suitable protective clothing because certain materiais ignite quickly, and can cause Wow-back” of hot gases Care should also be taken to avoid over-pressurization of the system, and to allow for venting

of exhaust gases

6 BSI 09- I999

````-`-`,,`,,`,`,,` -Page 5

EN 50267-1:1998

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EN 50267-1 : 1998

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EN 50267-1 :1998

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BSI

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