IEC TS 60695-1-14:2017
(Main)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
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
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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
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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
– 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
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
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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.
– 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.
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
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understanding of its contents. Users should therefore print this document using a
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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 appro
...
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