Fire hazard testing - Part 10-3: Abnormal heat - Mould stress relief distortion test

IEC 60695-10-3:2016 specifies a mould stress relief distortion test. It is applicable to electrotechnical equipment including parts made from polymeric materials. This test method is intended to evaluate the effects caused by relief of the residual process-induced stress, set in a moulded polymeric assembly of an end product. This stress relief occurs when the sample (energized or not), is exposed to conditioning at a defined temperature for a defined period of time. The test specimen is considered to have satisfactorily withstood the test if, after conditioning to room temperature, it meets defined test criteria. This basic safety publication is primarily 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. It is not intended for use by manufacturers or certification bodies. This second edition of IEC 60695-10-3 cancels and replaces the first edition issued in 2002. It constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
- Updated references;
- Updated equipment;
- Added terms and definitions;
- and added Bibliography. Key words: Fire Hazard, Abnormal Heat, Fire Safety Engineering, Mould Stress Relief Distortion Test.

Essais relatifs aux risques du feu - Partie 10-3: Chaleur anormale - Essai de déformation par réduction des contraintes de moulage

L'IEC 60695-10-3:2016 spécifie un essai de déformation par réduction des contraintes de moulage. Elle est applicable aux matériels électrotechniques, y compris les parties composées de matériaux polymères. Cette méthode d'essai est destinée à évaluer les effets provoqués par la réduction des contraintes résiduelles induites par traitement, se produisant dans un assemblage polymère moulé d'un produit final. Cette réduction de contraintes se produit lorsque l'échantillon (sous ou hors tension) est exposé au conditionnement à une température définie pendant une période de temps définie. L'éprouvette d'essai est considérée comme ayant satisfait à l'essai si, après le conditionnement à température ambiante, elle satisfait aux critères d'essai définis. La présente publication fondamentale de sécurité est essentiellement destinée à être utilisée par les comités d'études dans le cadre de l'élaboration de normes conformément aux principes établis dans le Guide IEC 104 et le Guide ISO/IEC 51. Elle n'est pas destinée à être utilisée par les fabricants ou les organismes de certification. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
- Références mises à jour;
- Matériel mis à jour;
- Termes et définitions ajoutés;
- et Bibliographie ajoutée. Mots-clés: Risques du feu, Chaleur anormale, l'ingénierie de la sécurité incendie, déformation par réduction des contraintes de moulage

General Information

Status
Published
Publication Date
06-Sep-2016
Technical Committee
Current Stage
PPUB - Publication issued
Completion Date
07-Sep-2016
Ref Project

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IEC 60695-10-3
Edition 2.0 2016-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
BASIC SAFETY PUBLICATION
PUBLICATION FONDAMENTALE DE SÉCURITÉ
Fire hazard testing –
Part 10-3: Abnormal heat – Mould stress relief distortion test
Essais relatifs aux risques du feu –
Partie 10-3: Chaleur anormale – Essai de déformation par réduction des
contraintes de moulage
IEC 60695-10-3:2016-09(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 60695-10-3
Edition 2.0 2016-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
BASIC SAFETY PUBLICATION
PUBLICATION FONDAMENTALE DE SÉCURITÉ
Fire hazard testing –
Part 10-3: Abnormal heat – Mould stress relief distortion test
Essais relatifs aux risques du feu –
Partie 10-3: Chaleur anormale – Essai de déformation par réduction des
contraintes de moulage
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 13.220.40; 29.020 ISBN 978-2-8322-3559-1

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: 3 ----------------------
– 2 – IEC 60695-10-3:2016  IEC 2016
CONTENTS

FOREWORD ......................................................................................................................... 3

INTRODUCTION ................................................................................................................... 5

1 Scope ............................................................................................................................ 6

2 Normative references..................................................................................................... 6

3 Terms and definitions .................................................................................................... 7

4 General description of the test ....................................................................................... 7

5 Test apparatus .............................................................................................................. 7

5.1 Heating oven ......................................................................................................... 7

5.2 Temperature measuring equipment ........................................................................ 8

6 Test specimens ............................................................................................................. 8

7 Conditioning .................................................................................................................. 8

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

8.1 General ................................................................................................................. 8

8.2 Parts exposed to uniform maximum operating temperatures ................................... 8

8.3 Parts exposed to variations in operating temperatures ........................................... 9

8.4 Test setup ............................................................................................................. 9

9 Test criteria ................................................................................................................... 9

10 Information to be given in the relevant product specification ........................................... 9

11 Test report................................................................................................................... 10

Bibliography ....................................................................................................................... 11

---------------------- Page: 4 ----------------------
IEC 60695-10-3:2016  IEC 2016 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIRE HAZARD TESTING –
Part 10-3: Abnormal heat –
Mould stress relief distortion test
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

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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 60695-10-3 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
89/1328/FDIS 89/1337/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.

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

---------------------- Page: 5 ----------------------
– 4 – IEC 60695-10-3:2016  IEC 2016

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

ISO/IEC Guide 51.

This second edition of IEC 60695-10-3 cancels and replaces the first edition issued in 2002. It

constitutes a technical revision.

This edition includes the following significant technical changes with respect to the previous

edition:
a) Updated references;
b) Updated equipment;
c) Added terms and definitions; and
d) Added Bibliography.

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.

The IEC 60695-10 series, under the general title Fire hazard testing, consists of the following

parts:
• Part 10-2: Abnormal heat – Ball pressure test
• Part 10-3: Abnormal heat – Mould stress relief distortion test

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.
---------------------- Page: 6 ----------------------
IEC 60695-10-3:2016  IEC 2016 – 5 –
INTRODUCTION

In the design of any electrotechnical product, the risk of abnormal heat and the potential

hazards associated with abnormal heat need to be considered. In this respect the objective of

component, circuit, and product design, as well as the choice of materials, is to reduce to

acceptable levels the potential risks during normal operating conditions, reasonable

foreseeable abnormal use, malfunction and/or failure. The IEC has developed

IEC 60695-1-10, together with its companion, IEC 60695-1-11, to provide guidance on how

this is to be accomplished.

The primary aims of IEC 60695-1-10 [1] and IEC 60695-1-11 [2] are to provide guidance on

how:
a) to prevent ignition caused by an electrically energized component part, and

b) to confine any resulting fire within the bounds of the enclosure of the electrotechnical

product in the event of ignition.

Secondary aims of IEC 60695-1-10 and IEC 60695-1-11 include the minimization of any flame

spread beyond the product’s enclosure and the minimization of the harmful effects of fire

effluents such as heat, smoke, toxicity and/or corrosivity.

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

sources. Considerations of this nature should be dealt with in the overall fire hazard

assessment.

This part of IEC 60695 describes a test method that simulates the effects caused by relief of

the residual process-induced stress, frozen in a moulded polymeric assembly of an end

product, when the end product or a part of it is exposed to conditioning at the maximum

allowable operating temperature. The test method is intended to be used to evaluate whether

the product after conditioning continues to meet the requirements of the relevant product

specification. It is not be used to solely describe or appraise the fire hazard or fire risk of

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

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

factors pertinent to a particular end use.

This part of IEC 60695 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 standard to establish appropriate safety and health practices and determine

the applicability of regulatory limitations prior to use.
___________
Numbers in square brackets refer to the bibliography.
---------------------- Page: 7 ----------------------
– 6 – IEC 60695-10-3:2016  IEC 2016
FIRE HAZARD TESTING –
Part 10-3: Abnormal heat –
Mould stress relief distortion test
1 Scope

This part of IEC 60695 specifies a mould stress relief distortion test. It is applicable to

electrotechnical equipment including parts made from polymeric materials.

This test method is intended to evaluate the effects caused by relief of the residual process-

induced stress, set in a moulded polymeric assembly of an end product. This stress relief

occurs when the sample (energized or not), is exposed to conditioning at a defined

temperature for a defined period of time. The test specimen is considered to have

satisfactorily withstood the test if, after conditioning to room temperature, it meets defined test

criteria.

This basic safety publication is primarily 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. It is not intended for use by manufacturers or certification bodies.

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 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.
IEC 60050 (all parts), International Electrotechnical Vocabulary (available at:
http://www.electropedia.org)

IEC 60216-4-1, Electrical insulating materials – Thermal endurance properties – Part 4-1:

Ageing ovens – Single-chamber ovens

IEC 60695-4:2012, Fire hazard testing – Part 4: Terminology concerning fire tests for

electrotechnical products

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 inclusion in standards
ISO 13943:2008, Fire safety – Vocabulary
---------------------- Page: 8 ----------------------
IEC 60695-10-3:2016  IEC 2016 – 7 –
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 13943:2008 and

IEC 60695-4:2012, some of which are reproduced below for the user’s convenience, and the

following apply.

ISO and IEC maintain terminological databases for use in standardization at the following

addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
creepage distance

shortest distance along the surface of a solid insulating material between two conductive

parts
[SOURCE: IEC 60050-151:2001, 151-15-50]
3.2
enclosure

external casing protecting the electrical and mechanical parts of apparatus

Note 1 to entry: The term excludes cables.
[SOURCE: ISO 13943:2008, 4.78]
3.3
end product
product that is ready for use without modification
Note 1 to entry: An end product can be a component of another end product.
[SOURCE: IEC 60695-4:2012, 3.2.7]
4 General description of the test

A test specimen is exposed to a specified temperature for a specified duration. The test

temperature and the test duration shall be specified in the relevant product specification. The

test duration shall not be less than 7 h. The test specimen is then examined to determine

compliance with the requirements in the relevant product specification.
5 Test apparatus
5.1 Heating oven

The heating oven shall be a single chamber type in accordance with IEC 60216-4-1 with

regard to temperature differences, fluctuation, and variations appropriate to the test

temperature.

In addition, the heating oven shall return to the specified temperature (± 2 °C) within 5 min

and without any overshoot exceeding 5 °C after the heating oven door is closed after inserting

the test specimen.
---------------------- Page: 9 ----------------------
– 8 – IEC 60695-10-3:2016  IEC 2016
5.2 Temperature measuring equipment

The temperature shall be measured using equipment with an accuracy of 1 % or better. It is

preferred to measure the temperature by a thermocouple type K or J inserted in the test

specimen support.
6 Test specimens

The test specimen shall be as defined in the relevant product specification. It is preferred that

the specimen should be a complete end product. Unless otherwise specified in the relevant

product specification, three test specimens are tested.
7 Conditioning

Unless otherwise required by the relevant product specification, the test specimens shall be

stored for at least 24 h immediately prior to testing in a laboratory atmosphere having a

temperature between 15 °C and 35 °C and a relative humidity of 75 % or less.
8 Test procedure
8.1 General

The procedure described in 8.2 is appropriate for parts exposed to uniform maximum

operating temperatures in the end use application. The procedure described in 8.3 may be

more appropriate if an enclosure or part has variations in temperature at different locations on

the part or is too large to be placed into the heating oven. For example, an enclosure for a

hair dryer may have elevated temperatures near the heating element whilst the area around

the power cord strain relief may only see room temperature. The procedure described in 8.3

accommodates the differences in temperature by operating the equipment within the heating

oven.
8.2 Parts exposed to uniform maximum operating temperatures

Unless otherwise specified in the relevant product specification, conduct the test in a heating

oven, with the product mounted in accordance with the manufacturer’s instructions, and at a

temperature defined in either a) or b) below:

a) the test temperature shall be the ambient temperature plus the maximum allowable

temperature rise of the part under consideration as defined in the relevant product

specification, or

b) the test temperature shall be the maximum operating temperature of the part under

consideration as defined in the relevant product specification.

NOTE 1 In the case of hand-held equipment, it has been found useful that the product be supported by a

mechanical clamp in at least one representative orientation.

Unless otherwise specified in the relevant product specification, the test temperature shall not

be less than 70 °C.

In some cases the product committee may choose to increase the test temperature by a

safety margin. This will be appropriate if no safety margins have been included for operating

temperatures or temperature rise in the relevant product specification.
NOTE 2 A typical safety margin could be 10 K.
---------------------- Page: 10 ----------------------
IEC 60695-10-3:2016  IEC 2016 – 9 –
8.3 Parts exposed to variations in operating temperatures

Alternatively to 8.2, conduct the test in a heating oven equipped with means for energizing the

end product. The circulation of air within the heating oven shall simulate actual end use

conditions. Unless otherwise specified in the relevant product specification, the air

temperature within the heating oven, as measured at the supporting surface of the end

product, shall be maintained at a temperature 10 K higher than the maximum allowable

ambient temperature for which the end product is designed to operate, but not less than

60 °C. Unless otherwise specified in the relevant product specification, the end product is

operated continuously at 106 % or 94 % of normal rated voltage, whichever results in higher

temperatures.
8.4 Test setup

For whichever test procedure is chosen (8.2 or 8.3), let the heating oven reach the desired

test temperature, and place each test specimen in the heating oven. Hand-held equipment is

to be supported by a mechanical clamp in at least one representative orientation. The test

specimens are conditioned in the heating ovens for a duration specified in the relevant

product specification, or the time sufficient to reach thermal equilibrium, but not less than 7 h.

A longer conditioning duration may be selected for parts of a large mass or if initial tests

indicate the potential for further relaxation.

After cooling to room temperature, examine the test specimen for shrinkage, warpage, or

other distortions that may affect compliance with the requirements in the relevant product

specification.

NOTE The test duration specified in 8.4 is generally sufficient to determine if the release of moulding stresses

would be detrimental. For parts of a large mass, or in cases where initial tests indicate the potential for further

relaxation, it has been found useful to select a longer test duration.
9 Test criteria

The test specimen is considered to have satisfactorily withstood the test if, after cooling to

room temperature, it continues to meet the requirements of the relevant product specification

and does not exhibit any significant shrinkage, warpage, or other distortion i.e.:

a) creepage distances do not fall below minimum acceptable values;
b) clearance distances do not fall below minimum acceptable values;
c) there are no changes that would make any hazardous part accessible; or

d) there are no changes that would produce any other condition that might increase the risk

of fire from the equipment.
10 Information to be given in the relevant product specification

The relevant product specification shall specify, where necessary, the following details:

a) the test temperature;
b) whether or not a safety margin of 10 K shall be applied (see 8.2 and 8.3);
c) a description of the test specimen (see Clause 6);
d) the number of test specimens to be tested if other than 3 (see Clause 6);
e) any conditioning required other than specified in Clause 7;
f) which test procedure is to be used (see Clause 8);

g) whether the test specimen shall be energized during the test; if yes, what per cent of the

normal rated voltage shall be applied (see 8.3);
h) the test duration (see 8.4);
---------------------- Page: 11 ----------------------
– 10 – IEC 60695-10-3:2016  IEC 2016

i) any other requirements related to changes in shape or dimension (see 8.4 and Clause 9);

j) any requirements for mechanical protection and to prevent undesired contacts with live

parts or internal wiring (see Clause 9);
k) minimum acceptable values for creepage distances (see Clause 9); and
l) minimum acceptable values for clearance distances (see Clause 9).
11 Test report
The test report shall include the following particulars:
a) a reference to this International Standard;
b) the number of test specimens
c) a description of the test specimen;
d) the material type, designation and manufacturer, where available;
e) details of conditioning;
f) the test temperature;
g) whether a test voltage was applied, and if so, the voltage used;
h) the duration of the test;
i) the result of the test; and
j) all relevant requirements specified in the relevant product specification.
---------------------- Page: 12 ----------------------
IEC 60695-10-3:2016  IEC 2016 – 11 –
Bibliography

[1] IEC 60695-1-10, Fire hazard testing – Part 1-10: Guidance for assessing the fire

hazard of electrotechnical products – General guidelines

[2] IEC 60695-1-11, Fire hazard testing – Part 1-11: Guidance for assessing the fire

hazard of electrotechnical products – Fire hazard assessment

[3] IEC 60050-151, International Electrotechnical Vocabulary – Part 151: Electrical and

magnetic devices
___________
---------------------- Page: 13 ----------------------
– 12 – IEC 60695-10-3:2016  IEC 2016
SOMMAIRE

AVANT-PROPOS ................................................................................................................ 13

INTRODUCTION ................................................................................................................. 15

1 Domaine d'application .................................................................................................. 16

2 Références normatives ................................................................................................ 16

3 Termes et définitions ................................................................................................... 17

4 Description générale de l'essai .................................
...

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