Fire hazard testing - Part 1-14: Guidance on the different levels of power and energy related to the probability of ignition and fire in low voltage electrotechnical products

IEC TS 60695-1-14:2017(E) provides guidance about the levels of power and energy that could cause ignition and fire in a low voltage electrotechnical product. It can be used by Product Committees to determine what fire hazard safeguards might be used, based on the electrical energy that could be dissipated as heat.
This document deals with products used in normal atmospheres commonly available in the home and does not deal with special locations such as those in explosive atmospheres. It is intended as guidance to IEC committees, and is intended be used with respect to their individual applications.
It has the status of a basic safety publication in accordance with IEC Guide 104 and ISO/IEC Guide 51.
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.
Key words: Fire Hazard, Probability of Ignition, Power and Energy Levels

General Information

Status
Published
Publication Date
06-Dec-2017
Technical Committee
Current Stage
PPUB - Publication issued
Completion Date
07-Dec-2017
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IEC TS 60695-1-14:2017 - Fire hazard testing - Part 1-14: Guidance on the different levels of power and energy related to the probability of ignition and fire in low voltage electrotechnical products
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IEC TS 60695-1-14
Edition 1.0 2017-12
TECHNICAL
SPECIFICATION
colour
inside
Fire hazard testing –
Part 1-14: Guidance on the different levels of power and energy related to
the probability of ignition and fire in low voltage electrotechnical products
IEC TS 60695-1-14:2017-12(en)
---------------------- Page: 1 ----------------------
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IEC TS 60695-1-14
Edition 1.0 2017-12
TECHNICAL
SPECIFICATION
colour
inside
Fire hazard testing –
Part 1-14: Guidance on the different levels of power and energy related to
the probability of ignition and fire in low voltage electrotechnical products
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 13.220.40, 29.020 ISBN 978-2-8322-4921-5

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

® Registered trademark of the International Electrotechnical Commission
---------------------- Page: 3 ----------------------
– 2 – IEC TS 60695-1-14:2017 IEC 2017
CONTENTS

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

INTRODUCTION ..................................................................................................................... 6

1 Scope .............................................................................................................................. 7

2 Normative references ...................................................................................................... 7

3 Terms and definitions ...................................................................................................... 8

4 Electrical energy as a cause of ignition ............................................................................ 9

5 Empirical safety values of electrical power and energy .................................................. 10

5.1 Different levels of power and electrical energy sources ......................................... 10

5.2 Electrical power and energy source that is unlikely to cause ignition (Class

1) .......................................................................................................................... 10

5.3 Electrical power and energy source that may cause ignition (Class 2) ................... 11

5.4 Electrical power and energy source that is likely to cause ignition (Class 3) .......... 12

5.5 Graphical overview of the classification ................................................................. 13

Bibliography .......................................................................................................................... 15

Figure 1 – Illustration of power/time limits related to fire and ignition .................................... 13

Figure 2 – Illustration of energy limits related to fire and ignition ........................................... 14

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IEC TS 60695-1-14:2017 IEC 2017 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIRE HAZARD TESTING –
Part 1-14: Guidance on the different levels of power and energy related to
the probability of ignition and fire in low voltage electrotechnical products
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

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

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The main task of IEC technical committees is to prepare International Standards. In

exceptional circumstances, a technical committee may propose the publication of a technical

specification when

• the required support cannot be obtained for the publication of an International Standard,

despite repeated efforts, or

• the subject is still under technical development or where, for any other reason, there is the

future but no immediate possibility of an agreement on an International Standard.

Technical specifications are subject to review within three years of publication to decide

whether they can be transformed into International Standards.

IEC TS 60695-1-14, which is a technical specification, has been prepared by IEC technical

committee 89: Fire hazard testing.
---------------------- Page: 5 ----------------------
– 4 – IEC TS 60695-1-14:2017 IEC 2017

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

ISO/IEC Guide 51.
The text of this technical specification is based on the following documents:
Enquiry draft Report on voting
89/1334/DTS 89/1363/RVDTS

Full information on the voting for the approval of this technical specification 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.

This publication is to be used in conjunction with IEC 60695-1-10 and IEC 60695-1-11.

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 1 consists of the following parts:
Part 1-10: Guidance for assessing the fire hazard of electrotechnical products –
General guidelines
Part 1-11: Guidance for assessing the fire hazard of electrotechnical products –
Fire hazard assessment
Part 1-12: Guidance for assessing the fire hazard of electrotechnical products –
Fire safety engineering

Part 1-14: Guidance on the different levels of power and energy related to the probability of

ignition and fire in low voltage electrotechnical products (this document)

Part 1-20: Guidance for assessing the fire hazard of electrotechnical products – Ignitability –

General guidance

Part 1-21: Guidance for assessing the fire hazard of electrotechnical products – Ignitability –

Summary and relevance of test methods

Part 1-30: Guidance for assessing the fire hazard of electrotechnical products – Preselection

testing process – General guidelines

Part 1-40: Guidance for assessing the fire hazard of electrotechnical products – Insulating

liquids
In this standard, the following print types or formats are used:
– requirements proper and normative annexes: in roman type;
– compliance statements and test specifications: italic type;
in smaller roman type;
– notes/explanatory matter:
– normative conditions within tables: in smaller roman type;
– terms defined in Clause 3: bold type.
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IEC TS 60695-1-14:2017 IEC 2017 – 5 –

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

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

related to the specific publication. At this date, the publication will be
• transformed into an International standard,
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.

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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– 6 – IEC TS 60695-1-14:2017 IEC 2017
INTRODUCTION

In the design of any 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 the risk of fire to a

tolerable level even in the event of reasonably foreseeable (mis)use, malfunction or failure.

IEC 60695-1-10, IEC 60695-1-11 and IEC 60695-1-12 provide guidance on how this is to be

accomplished.

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

Considerations of this nature are dealt with in an 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;

– 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 technical specification provides guidance to Product Committees on the power levels and

amounts of energy that are likely to cause ignition and fire. It also provides guidance to

Product Committees on the fire hazard safeguards that might be necessary to protect

against the probability of ignition.

The probability of fire is highly dependent on the specific fire scenario within the

electrotechnical product itself. Therefore, product committees are ultimately responsible for

deciding what fire hazard safeguards are appropriate for their products.

This document was created due to a need (IEC technical committee 66) for guidance on

electrical energy levels in relation to ignition and fire. The preparation of this TS is based on

based on electrical energy 141 levels developed by TC 108, responsible for safety of audio,

video and ICT equipment.
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IEC TS 60695-1-14:2017 IEC 2017 – 7 –
FIRE HAZARD TESTING –
Part 1-14: Guidance on the different levels of power and energy related to
the probability of ignition and fire in low voltage electrotechnical products
1 Scope

This part of IEC 60695, which is a technical specification, provides guidance about the levels

of power and energy that could cause ignition and fire in a low voltage electrotechnical

product. It can be used by Product Committees to determine what fire hazard safeguards

might be used, based on the electrical energy that could be dissipated as heat.

This document deals with products used in normal atmospheres commonly available in the

home and does not deal with special locations such as those in explosive atmospheres. It is

intended as guidance to IEC committees, and is intended be used with respect to their

individual applications.

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 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 60695-1-10, Fire hazard testing - Part 1-10: Guidance for assessing the fire hazard of

electrotechnical products - General guidelines

IEC 60695-1-11, Fire hazard testing - Part 1-11: Guidance for assessing the fire hazard of

electrotechnical products - Fire hazard assessment

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

electrotechnical products

IEC 62368-1:2014, Audio/video, information and communication technology equipment - Part

1: Safety requirements

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 13943:2008, Fire safety – Vocabulary
---------------------- Page: 9 ----------------------
– 8 – IEC TS 60695-1-14:2017 IEC 2017
3 Terms and definitions

For the purposes of this document, the terms and definitions given in IEC 60695-4:2012 and

ISO 13943:2008 (some of which are reproduced below) 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
fire hazard

physical object or condition with a potential for an undesirable consequence from fire

[SOURCE: ISO 13943:2008, 4.112]
3.2
fire hazard safeguard

part or system or instruction specifically provided to reduce the likelihood of ignition or

spread of fi
...

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