Fire hazard testing - Part 11-20: Test flames - 500 W flame test method

IEC 60695-11-20:2015 describes a test method consisting of two small-scale laboratory test procedures which is intended to compare the burning behaviour of different materials used in electrotechnical products. Vertically oriented bar specimens or horizontally oriented plate test specimens are exposed to a small flame ignition source with a nominal thermal power of 500 W. The test method uses two test specimen configurations to classify material performance. Rectangular bar-shaped test specimens are used to assess ignitability and burning behaviour, and square plate test specimens are used to assess the resistance of the test specimen to burn-through, as defined in 8.3.3. This test method only applies to materials that have been classified as V-0 or V-1 according to IEC 60695-11-10. This test method is only applicable to solid and cellular materials that have an apparent density of more than 250 kg/m3, determined in accordance with ISO 845. The method does not apply to materials that shrink away from the applied flame without igniting due to their thinness. The test method described provides classifications which may be used for quality assurance, the pre-selection of component materials of products, or to verify the required minimum flammability classification of materials used in end products. If used for pre-selection, then positive results shall be obtained at a test specimen thickness which equals the smallest thickness used in the product application. The results obtained provide some information about the behaviour of materials in service, but cannot by themselves assure safe performance in service. This second edition cancels and replaces the consolidated version of IEC 60695-11-20 published in 2003. This edition constitutes a technical revision. The main changes with respect to the first edition are as follows: - The Part title has been modified to the singular - 500 W flame test method; - Editorial changes have been made throughout the document for the purpose of aligning IEC 60695-11-10 with IEC 60695-11-20; - The Introduction has been modified to clarify the description of the test method; - The Scope has been modified for clarification; - All occurrences of the term "fixture" have been deleted from the document; - Preferred thickness values have been added to 7.2 and 7.3; - 7.4.4: 'Thickness measurement' is now numbered 7.5 to which a new Table 1 - Thickness tolerances has been added; - New Subclause 8.1.4 'Conditioning of the cotton pad' has been added; - 8.2.3 clarifies the application of the test flame to distorted specimens; - Explanatory notes have been added to Figures 5 and 6 and the Bibliography has been updated and references added. This basic safety publication is intended for use by technical committees in the preparation of standards in accordance with the principles laid down in IEC Guide 104 and ISO/IEC Guide 51. This standard is to be used in conjunction with IEC 60695-13-3. Key words: Test flames,Fire Hazard, Fire Test Method

Prüfungen zur Beurteilung der Brandgefahr - Teil 11-20: Prüfflammen - Prüfverfahren mit einer 500-W-Prüfflamme

Essais relatifs aux risques du feu - Partie 11-20: Flammes d'essai - Méthode d'essai à la flamme de 500 W

L'IEC 60695-11-20:2015 décrit une méthode d'essai composée de deux procédures d'essai en laboratoire à petite échelle, ayant pour objet de comparer le comportement en combustion des différents matériaux utilisés dans les produits électrotechniques. Des éprouvettes barreaux orientées verticalement ou des éprouvettes d'essai plaques orientées horizontalement sont exposées à une faible source d'allumage à flamme d'une puissance thermique nominale de 500 W. La méthode d'essai utilise deux configurations d'éprouvette d'essai pour classifier les performances du matériau. Des éprouvettes d'essai en forme de barreaux rectangulaires sont utilisées pour évaluer l'allumabilité et le comportement en combustion, et des éprouvettes d'essai plaques carrées sont utilisées pour évaluer la résistance de l'éprouvette d'essai au transpercement, tel que défini en 8.3.3. Cette méthode d'essai s'applique uniquement aux matériaux qui ont été classés comme V-0 ou V-1, conformément à l'IEC 60695-11-10. Cette méthode d'essai s'applique uniquement aux matériaux solides et alvéolaires présentant une masse volumique apparente de plus de 250 kg/m3, déterminée conformément à l'ISO 845. La méthode ne s'applique pas aux matériaux qui se rétractent devant la flamme appliquée sans s'allumer en raison de leur finesse. La méthode d'essai décrite fournit les classifications qui peuvent être utilisées pour l'assurance qualité, la présélection des matériaux constitutifs des produits ou pour vérifier la classification d'inflammabilité minimale requise des matériaux utilisés dans les produits finaux. Si elle est utilisée pour la présélection, des résultats positifs doivent être obtenus à une épaisseur d'éprouvette d'essai égale à la plus petite épaisseur utilisée dans l'application du produit. Les résultats obtenus donnent des informations sur le comportement des matériaux en service, mais ne peuvent pas par eux-mêmes assurer la sécurité en service. Cette deuxième édition annule et remplace la version consolidée de l'IEC 60695-11-20 publiée en 2003. Cette édition constitue une révision technique. Par rapport à la première édition, les changements majeurs sont les suivants: - le titre de la partie a été modifié au singulier - Méthode d'essai à la flamme de 500 W; - des modifications éditoriales ont été apportées tout au long du document afin d'aligner l'IEC 60695-11-10 sur l'IEC 60695-11-20; - l'introduction a été modifiée afin de clarifier la description de la méthode d'essai; - le domaine d'application a été modifié pour apporter des precisions; - toutes les occurrences du terme "fixation" ont été supprimées du document; - les valeurs d'épaisseur préférentielles ont été ajoutées à 7.2 et 7.3; - 7.4.4: "Mesure de l'épaisseur" fait désormais l'objet du paragraphe 7.5, auquel un nouveau Tableau 1 - Tolérances d'épaisseur, a été ajouté; - un nouveau paragraphe 8.1.4 "Conditionnement du coussin de coton" a été ajouté; - le paragraphe 8.2.3 précise l'application de la flamme d'essai aux éprouvettes déformées; - des notes explicatives ont été ajoutées aux Figures 5 et 6 et la Bibliographie a été mise à jour et des références ont été ajoutées; - Elle a le statut d'une publication fondamentale de sécurité, conformément au Guide IEC 104 et au Guide ISO/IEC 51. Cette Norme internationale doit être utilisée conjointement avec l'IEC 60695-11-3. Mots clés: flames d'essai, ris

Preskušanje požarne ogroženosti - 11-20. del: Preskusni plameni - Preskusne metode s 500-vatnim plamenom

Ta del standarda IEC 60695 opisuje preskusno metodo, ki zajema dva manjša laboratorijska preskusna postopka, ki je namenjena primerjavi gorljivosti različnih materialov, uporabljenih v elektrotehničnih izdelkih. Navpično usmerjeni palični preskušanci ali vodoravno usmerjeni ploščati preskušanci so izpostavljeni majhnemu viru vžiga z majhnim plamenom z nazivno toplotno močjo 500 W. Preskusna metoda uporablja dve konfiguraciji preskušancev za opredelitev lastnosti materiala. Pravokotni preskušanci v obliki palic se uporabljajo za oceno vnetljivosti in gorljivosti, pravokotni preskušanci v obliki ploščic pa se uporabijo za oceno odpornosti preskušanca na prodiranje ognja skozi material, kot je opredeljeno v točki 8.3.3. Ta preskusna metoda se uporablja samo za materiale, opredeljene kot V-0 ali V-1 v skladu s standardom IEC 60695-11-10.
Ta preskusna metoda se uporablja samo za trdne in penjene materiale z navidezno gostoto nad 250 kg/m3, določeno v skladu s standardom ISO 845. Metoda se ne uporablja za materiale, ki se skrčijo in umaknejo od približanega plamena brez vžiga, ker so tako tanki.
Opisana preskusna metoda zagotavlja klasifikacije, ki se lahko uporabljajo za zagotavljanje kakovosti, predizbiro materialov za komponente izdelkov ali za preverjanje zahtevane klasifikacije minimalne vnetljivosti materialov, ki se uporabljajo v končnih izdelkih. Če se uporabljajo za predizbiro, se pozitivni rezultati pridobijo pri debelini preskušanca, ki je enaka najmanjši debelini, ki se uporablja pri uporabi izdelka.
Pridobljeni rezultati zagotavljajo nekaj informacij o obnašanju uporabljenih materialov, vendar sami ne morejo zagotoviti varnega delovanja med uporabo.
OPOMBA 1: Navodila o predizbiri so podana v standardu IEC 60695-1-30 [3]1.
OPOMBA 2: Na preskusne rezultate vplivajo aditivi materialov, npr. pigmenti, polnila in zaščitna sredstva proti ognju, ter lastnosti, kot sta smer anizotropije in molekulska masa.
Ta osnovna varnostna publikacija je namenjena tehničnim odborom za pripravo standardov v skladu z načeli vodil IEC 104 in ISO/IEC 51.
Ena od odgovornosti tehničnega odbora je, da kjer je to primerno, uporablja osnovne varnostne publikacije. Zahteve, preskusne metode ali preskusni pogoji iz te osnovne varnostne publikacije se ne uporabljajo, razen če so izrecno navedeni ali zajeti v ustrezne publikacije.

General Information

Status
Published
Publication Date
02-Jul-2015
Drafting Committee
Current Stage
6060 - Document made available
Due Date
03-Jul-2015
Completion Date
03-Jul-2015

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SLOVENSKI STANDARD
SIST EN 60695-11-20:2015
01-september-2015
1DGRPHãþD
SIST EN 60695-11-20:2000
SIST EN 60695-11-20:2000/A1:2004
Preskušanje požarne ogroženosti - 11-20. del: Preskusni plameni - Preskusne
metode s 500-vatnim plamenom
Fire hazard testing - Part 11-20: Test flames - 500 W flame test methods

Essais relatifs aux risques du feu - Partie 11-20: Flammes d'essai - Méthodes d'essai à

la flamme de 500 W

Essais relatifs aux risques du feu - Partie 11-20: Flammes d'essai - Méthodes d'essai à

la flamme de 500 W
Ta slovenski standard je istoveten z: EN 60695-11-20:2015
ICS:
13.220.40 Sposobnost vžiga in Ignitability and burning
obnašanje materialov in behaviour of materials and
proizvodov pri gorenju products
29.020 Elektrotehnika na splošno Electrical engineering in
general
SIST EN 60695-11-20:2015 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN 60695-11-20:2015
---------------------- Page: 2 ----------------------
SIST EN 60695-11-20:2015
EUROPEAN STANDARD EN 60695-11-20
NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2015
ICS 13.220.40; 29.020 Supersedes EN 60695-11-20:1999
English Version
Fire hazard testing - Part 11-20: Test flames - 500 W flame test
methods
(IEC 60695-11-20:2015)

Essais relatifs aux risques du feu - Partie 11-20: Flammes Prüfungen zur Beurteilung der Brandgefahr - Teil 11-20:

d'essai - Méthodes d'essai à la flamme de 500 W Prüfflammen - Prüfverfahren mit einer 500-W-Prüfflamme

(IEC 60695-11-20:2015) (IEC 60695-11-20:2015)

This European Standard was approved by CENELEC on 2015-05-27. 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, 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

© 2015 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. EN 60695-11-20:2015 E
---------------------- Page: 3 ----------------------
SIST EN 60695-11-20:2015
EN 60695-11-20:2015
European foreword

The text of document 89/1241/FDIS, future edition 2 of IEC 60695-11-20, prepared by IEC/TC 89 "Fire

hazard testing" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as

EN 60695-11-20:2015.
The following dates are fixed:
(dop) 2016-02-27
• latest date by which the document has to be implemented at
national level by publication of an identical national
standard or by endorsement
(dow) 2018-05-27
• latest date by which the national standards conflicting with
the document have to be withdrawn
This document supersedes EN 60695-11-20:1999.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such

patent rights.

This standard covers the Principle Elements of the Safety Objectives for Electrical Equipment

Designed for Use within Certain Voltage Limits (LVD - 2006/95/EC).
Endorsement notice

The text of the International Standard IEC 60695-11-20:2015 was approved by CENELEC as a

European Standard without any modification.

In the official version, for Bibliography, the following notes have to be added for the standards indicated:

IEC 60695-1-10:2009 NOTE Harmonized as 60695-1-10:2010 (not modified).
IEC 60695-1-11:2010 NOTE Harmonized as EN 60695-1-11:2010 (not modified).
IEC 60695-1-30:2008 NOTE Harmonized as EN 60695-1-30:2008 (not modified).
IEC 60695-11-5:2004 NOTE Harmonized as EN 60695-11-5:2005 (not modified).
ISO 1043-1:2011 NOTE Harmonized as EN ISO 1043-1:2011 (not modified).
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SIST EN 60695-11-20:2015
EN 60695-11-20:2015
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

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.

NOTE 1 When an International Publication has been modified by common modifications, indicated by (mod),

the relevant EN/HD applies.

NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is

available here: www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60695-4 2012 Fire hazard testing - EN 60695-4 2012
Part 4: Terminology concerning fire tests
for electrotechnical products
IEC 60695-11-3 - Fire hazard testing - EN 60695-11-3 -
Part 11-3: Test flames - 500 W flames -
Apparatus and confirmational test
methods
IEC 60695-11-10 - Fire hazard testing - EN 60695-11-10 -
Part 11-10: Test flames - 50 W horizontal
and vertical flame test methods
IEC Guide 104 - The preparation of safety publications and - -
the use of basic safety publications and
group safety publications
ISO/IEC Guide 51 - Safety aspects - Guidelines for their - -
inclusion in standards
ISO 291 - Plastics - Standard atmospheres for EN ISO 291 -
conditioning and testing
ISO 293 - Plastics - Compression moulding of test EN ISO 293 -
specimens of thermoplastic materials
ISO 294-1 1996 Plastics - Injection moulding of test EN ISO 294-1 1998
specimens of thermoplastic materials
Part 1: General principles, and moulding
of multipurpose and bar test specimens
ISO 294-2 1996 Plastics - Injection moulding of test EN ISO 294-2 1998
specimens of thermoplastic materials
Part 2: Small tensile bars
---------------------- Page: 5 ----------------------
SIST EN 60695-11-20:2015
EN 60695-11-20:2015
Publication Year Title EN/HD Year
1) 2)
ISO 294-3 1996 Plastics - Injection moulding of test EN ISO 294-3 1998
specimens of thermoplastic materials
Part 3: Small plates
ISO 295 - Plastics - Compression moulding of test EN ISO 295 -
specimens of thermosetting materials
ISO 845 - Cellular plastics and rubbers - EN ISO 845 -
Determination of apparent density
ISO 13943 2008 Fire safety - Vocabulary EN ISO 13943 2010
ISO 16012 - Plastics - Determination of linear - -
dimensions of test specimens
1) Superseded by ISO 294-3:2002.
2) Superseded by EN ISO 294-3:2003.
---------------------- Page: 6 ----------------------
SIST EN 60695-11-20:2015
IEC 60695-11-20
Edition 2.0 2015-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
BASIC SAFETY PUBLICATION
PUBLICATION FONDAMENTALE DE SÉCURITÉ
Fire hazard testing –
Part 11-20: Test flames – 500 W flame test method
Essais relatifs aux risques du feu –
Partie 11-20: Flammes d'essai – Méthode d'essai à la flamme de 500 W
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 13.220.40; 29.020 ISBN 978-2-8322-2610-0

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 7 ----------------------
SIST EN 60695-11-20:2015
– 2 – IEC 60695-11-20:2015 © IEC 2015
CONTENTS

FOREWORD ......................................................................................................................... 4

INTRODUCTION ................................................................................................................... 7

1 Scope ............................................................................................................................ 8

2 Normative references..................................................................................................... 8

3 Terms and definitions .................................................................................................... 9

4 Principle ...................................................................................................................... 12

5 Significance of the fire tests ......................................................................................... 13

5.1 General ............................................................................................................... 13

5.2 Limitations on the use of test results .................................................................... 13

5.3 Physical properties that can effect burning behaviour ........................................... 13

5.4 Shrinkage and distortion ...................................................................................... 13

5.5 Effects of test specimen conditioning ................................................................... 13

6 Apparatus .................................................................................................................... 13

6.1 Laboratory fumehood/chamber ............................................................................ 13

6.2 Laboratory burner ............................................................................................... 14

6.3 Support stand ..................................................................................................... 14

6.4 Timing device ...................................................................................................... 14

6.5 Measuring scale .................................................................................................. 14

6.6 Conditioning chamber.......................................................................................... 14

6.7 Micrometer .......................................................................................................... 14

6.8 Desiccator chamber ............................................................................................ 14

6.9 Air-circulating oven ............................................................................................. 14

6.10 Cotton pads ........................................................................................................ 14

6.11 Burner mounting block ......................................................................................... 15

7 Test specimens ........................................................................................................... 15

7.1 Test specimen preparation .................................................................................. 15

7.2 Bar test specimens .............................................................................................. 15

7.3 Plate test specimens ........................................................................................... 15

7.4 Testing materials – ranges in formulations ........................................................... 15

7.4.1 General ....................................................................................................... 15

7.4.2 Density, melt flows and filler/reinforcement ................................................... 16

7.4.3 Colour (bar test specimens only) .................................................................. 16

7.5 Thickness measurements .................................................................................... 16

8 Test procedure ............................................................................................................ 17

8.1 Conditioning ........................................................................................................ 17

8.1.1 General ....................................................................................................... 17

8.1.2 Conditioning of specimens in conditioning chamber (“As Received”) .............. 17

8.1.3 Conditioning of specimens in air-circulating oven .......................................... 17

8.1.4 Conditioning of the cotton pad ...................................................................... 17

8.1.5 Test conditions ............................................................................................ 17

8.2 Test procedure – bar test specimens ................................................................... 18

8.2.1 Test specimen setup .................................................................................... 18

8.2.2 Flame setup ................................................................................................. 18

8.2.3 Flame application and observations .............................................................. 18

8.2.4 Criteria for retest .......................................................................................... 19

8.3 Test procedure – plate shaped test specimens ..................................................... 19

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SIST EN 60695-11-20:2015
IEC 60695-11-20:2015 © IEC 2015 – 3 –

8.3.1 Support stand .............................................................................................. 19

8.3.2 Flame setup ................................................................................................. 19

8.3.3 Flame application and observations .............................................................. 19

8.3.4 Criteria for retest .......................................................................................... 19

8.4 Classification ...................................................................................................... 20

8.5 Test report .......................................................................................................... 20

Annex A (normative) Detailed requirements for the flame application point .......................... 26

A.1 Dynamic deformation........................................................................................... 26

A.2 J-shape or twisting deformation ........................................................................... 26

A.3 Curling deformation ............................................................................................. 26

A.4 Severe deformation ............................................................................................. 26

Bibliography ....................................................................................................................... 31

Figure 1 – Vertical burning test for bar test specimen .......................................................... 21

Figure 2 – Horizontal burning test for plates ........................................................................ 22

Figure 3 – Burner mounting block – Example ....................................................................... 22

Figure 4 – Test specimens .................................................................................................. 23

Figure 5 – Examples of flame application ............................................................................ 24

Figure 6 – 5V specimen gauge (Example) ........................................................................... 25

Figure A.1 – Flame application points for a specimen which deforms dynamically ................. 27

Figure A.2 – Flame application point for twisted and J-shaped specimens ............................ 28

Figure A.3 – Flame application point for a curled specimen .................................................. 29

Figure A.4 – Flame application point when there is severe deformation ................................ 30

Table 1 – Thickness tolerances ........................................................................................... 17

Table 2 – 5V burning classification ...................................................................................... 20

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SIST EN 60695-11-20:2015
– 4 – IEC 60695-11-20:2015 © IEC 2015
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIRE HAZARD TESTING –
Part 11-20: Test flames –
500 W flame test method
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

all national electrotechnical committees (IEC National Committees). The object of IEC is to promote

international co-operation on all questions concerning standardization in the electrical and electronic fields. To

this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,

Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC

Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested

in the subject dealt with may participate in this preparatory work. International, governmental and non-

governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely

with the International Organization for Standardization (ISO) in accordance with conditions determined by

agreement between the two organizations.

2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international

consensus of opinion on the relevant subjects since each technical committee has representation from all

interested IEC National Committees.

3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC

Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any

misinterpretation by any end user.

4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications

transparently to the maximum extent possible in their national and regional publications. Any divergence

between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in

the latter.

5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity

assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any

services carried out by independent certification bodies.

6) All users should ensure that they have the latest edition of this publication.

7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and

members of its technical committees and IEC National Committees for any personal injury, property damage or

other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and

expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC

Publications.

8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

indispensable for the correct application of this publication.

9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of

patent rights. IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 60695-11-20 has been prepared by IEC technical committee 89:

Fire hazard testing.
The text of this standard is based on the following documents:
FDIS Report on voting
89/1241/FDIS 89/1250/RVD

Full information on the voting for the approval of this standard can be found in the report on

voting indicated in the above table.
---------------------- Page: 10 ----------------------
SIST EN 60695-11-20:2015
IEC 60695-11-20:2015 © IEC 2015 – 5 –

This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

This second edition cancels and replaces the first edition of IEC 60695-11-20 published in

1999. This edition constitutes a technical revision.
The main changes with respect to the first edition are listed below:
– The Part title has been modified to the singular – 500 W flame test method.

– Editorial changes have been made throughout the document for the purpose of aligning

IEC 60695-11-10 with IEC 60695-11-20.

– The Introduction has been modified to clarify the description of the test method.

– The Scope has been modified for clarification.
– All occurrences of the term “fixture” have been deleted from the document.
– Preferred thickness values have been added to 7.2 and 7.3.

– 7.4.4: ‘Thickness measurement’ is now numbered 7.5 to which a new Table 1 – Thickness

tolerances has been added.
– New Subclause 8.1.4 ‘Conditioning of the cotton pad’ has been added.
– 8.2.3 clarifies the application of the test flame to distorted specimens
– Explanatory notes have been added to Figures 5 and 6.
– The Bibliography has been updated and references added.

It has the status of a basic safety publication in accordance with IEC Guide 104 and

ISO/IEC Guide 51.
This International Standard is to be used in conjunction with IEC 60695-11-3.

A list of all the parts in the IEC 60695 series, under the general title Fire hazard testing, can

be found on the IEC website.
Part 11 consists of the following parts:

Part 11-2: Test flames – 1 kW nominal pre-mixed flame – Apparatus, confirmatory test

arrangement and guidance

Part 11-3: Test flames – 500 W flames – Apparatus and confirmational test methods

Part 11-4: Test flames – 50 W flame – Apparatus and confirmational test method
Part 11-5: Test flames – Needle-flame test method – Apparatus, confirmatory test
arrangement and guidance
Part 11-10: Test flames – 50 W horizontal and vertical flame test methods

Part 11-11: Test flames – Determination of the characteristic heat flux for ignition from a

non-contacting flame source
Part 11-20: Test flames – 500 W flame test methods
Part 11-30: Test flames – History and development from 1979 to 1999
Part 11-40: Test flames – Confirmatory tests – Guidance
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SIST EN 60695-11-20:2015
– 6 – IEC 60695-11-20:2015 © IEC 2015

The committee has decided that the contents of this publication will remain unchanged until

the stability date indicated on the IEC website under "http://webstore.iec.ch" in the data

related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates

that it contains colours which are considered to be useful for the correct

understanding of its contents. Users should therefore print this document using a

colour printer.
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SIST EN 60695-11-20:2015
IEC 60695-11-20:2015 © IEC 2015 – 7 –
INTRODUCTION

In the design of an electrotechnical product the risk of fire and the potential hazards

associated with fire need to be considered. In this respect the objective of component, circuit

and equipment design as well as the choice of materials is to reduce to a tolerable level of

risk of fire even in the event of reasonably foreseeable (mis)use, malfunction or failure. Fires

involving electrotechnical products can also be initiated from external non-electrical sources.

Considerations of this nature are dealt with in the overall fire hazard assessment.

The aim of the IEC 60695 series of standards is to save lives and property by reducing the

number of fires or reducing the consequences of the fire. This can be accomplished by:

– trying to prevent ignition caused by an electrically energised component part and, in the

event of ignition, to confine any resulting fire within the bounds of the enclosure of the

electrotechnical product.

– trying to minimise flame spread beyond the product’s enclosure and to minimise the

harmful effects of fire effluents including heat, smoke, and toxic or corrosive combustion

products.

This part of IEC 60695 describes a test method which consists of two small-scale fire test

procedures carried out on materials used in electrotechnical equipment. A 500 W test flame is

used as an ignition source. The test method described provides classifications which may be

used for quality assurance, the pre-selection of component materials of products, or to verify

the required minimum flammability classification of materials used in end products.

This test method should not be used to solely describe or appraise the fire hazard or fire risk

of materials, products, or assemblies under actual fire conditions. However, results of this test

may be used as elements of a fire hazard assessment which takes into account all of the

factors which are pertinent to a particular end use.

This international standard may involve hazardous materials, operations, and equipment. It

does not purport to address all of the safety problems associated with its use. It is the

responsibility of the user of this international standard to establish appropriate safety and

health practices and determine the applicability of regulatory limitations prior to use.

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SIST EN 60695-11-20:2015
– 8 – IEC 60695-11-20:2015 © IEC 2015
FIRE HAZARD TESTING –
Part 11-20: Test flames –
500 W flame test method
1 Scope

This part of IEC 60695 describes a test method consisting of two small-scale laboratory test

procedures which is intended to compare the burning behaviour of different materials used in

electrotechnical products. Vertically oriented bar specimens or horizontally oriented plate test

specimens are exposed to a small flame ignition source with a nominal thermal power of

500 W. The test method uses two test specimen configurations to classify material

performance. Rectangular bar-shaped test specimens are used to assess ignitability and

burning behaviour, and square plate test specimens are used to assess the resistance of the

test specimen to burn-through, as defined in 8.3.3. This test method only applies to materials

that have been classified as V-0 or V-1 according to IEC 60695-11-10.

This test method is only applicable to solid and cellular materials that have an apparent

density of more than 250 kg/m , determined in accordance with ISO 845. The method does

not apply to materials that shrink away from the applied flame without igniting due to their

thinness.

The test method described provides classifications which may be used for quality assurance,

the pre-selection of component materials of products, or to verify the required minimum

flammability classification of materials used in end products. If used for pre-selection, then

positive results shall be obtained at a test specimen thickness which equals the smallest

thickness used in the product application.

The results obtained provide some information about the behaviour of materials in service, but

cannot by themselves assure safe performance in service.
NOTE 1 Guidance on pre-selection is given in IEC 60695-1-30 [3] .

NOTE 2 Test results are influenced by material additives, e.g. pigments, fillers, and fire retardants, and properties

such as the direction of anisotropy and the molecular mass.

This basic safety publication is intended for use by technical committees in the preparation of

standards in accordance with the principles laid down in IEC Guide 104 and
ISO/IEC Guide 51.

One of the responsibilities of a technical committee is, wherever applicable, to make use of

basic safety publications in the preparation of its publications. The requirements, test

methods or test conditions of this basic safety publication will not apply unless specifically

referred to or included in the relevant publications.
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.
________________
Numbers in square brackets refer to the bibliography.
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SIST EN 60695-11-20:2015
IEC 60695-11-20:2015 © IEC 2015 – 9 –
IEC 60695-4:2012, Fire hazard testing – Part 4: Term
...

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