IEC 63522-36:2025

IEC 63522-36 ®
Edition 1.0 2025-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Electrical relays – Tests and measurements –
Part 36: Fire hazard
Relais électriques – Essais et mesures –
Partie 36: Danger d'incendie
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IEC 63522-36 ®
Edition 1.0 2025-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Electrical relays – Tests and measurements –

Part 36: Fire hazard
Relais électriques – Essais et mesures –

Partie 36: Danger d'incendie
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.120.70  ISBN 978-2-8327-0231-4

– 2 – IEC 63522-36:2025 © IEC 2025
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references. 5
3 Terms and definitions . 6
4 Test procedure . 6
4.1 General . 6
4.2 Glow-wire test . 6
4.2.1 Purpose . 6
4.2.2 Procedure . 6
4.2.3 Conditions to be specified . 7
4.3 Needle flame test . 8
4.3.1 Purpose . 8
4.3.2 Procedure . 8
4.3.3 Conditions to be specified . 8
5 Evaluation . 8
5.1 General . 8
5.1.1 Glow-wire test evaluation . 8
5.1.2 Needle flame test evaluation . 8
5.2 Test report . 9
Bibliography . 10

Figure 1 – An example to show the test points on relay . 7

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTRICAL RELAYS –
TESTS AND MEASUREMENTS –
Part 36: Fire hazard
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
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Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
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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
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expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
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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) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). IEC takes no position concerning the evidence, validity or applicability of any claimed patent rights in
respect thereof. As of the date of publication of this document, IEC had not received notice of (a) patent(s), which
may be required to implement this document. However, implementers are cautioned that this may not represent
the latest information, which may be obtained from the patent database available at https://patents.iec.ch. IEC
shall not be held responsible for identifying any or all such patent rights.
IEC 63522-36 has been prepared by IEC technical committee 94: Electrical relays. It is an
International Standard.
The text of this International Standard is based on the following documents:
Draft Report on voting
94/1074/FDIS 94/1119/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.

– 4 – IEC 63522-36:2025 © IEC 2025
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
A list of all parts of IEC 63522 series, published under the general title Electrical relays – Tests
and measurements, can be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn, or
• revised.
ELECTRICAL RELAYS –
TESTS AND MEASUREMENTS –
Part 36: Fire hazard
1 Scope
This part of lEC 63522 is used for testing all kinds of electrical relays and for evaluating their
ability to perform under expected conditions of transportation, storage, and all aspects of
operational use.
NOTE Examples for electrical relays in the sense of this document include electromechanical relays, reed relays,
reed contacts, reed switches, solid state relays, time relays and technology combinations of these.
This document defines a standard test method to measure fire hazards of all materials
susceptible to fire hazards.
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 60695-2-10, Fire hazard testing – Part 2-10: Glowing/hot-wire based test methods –
Glow-wire apparatus and common test procedure
IEC 60695-2-11:2021, Fire hazard testing – Part 2-11: Glowing/hot-wire based test methods –
Glow-wire flammability test method for end products (GWEPT)
IEC 60695-2-12, Fire hazard testing – Part 2-12: Glowing/hot-wire based test methods –
Glow-wire flammability index (GWFI) test method for materials
IEC 60695-2-13, Fire hazard testing – Part 2-13: Glowing/hot-wire based test methods –
Glow-wire ignition temperature (GWIT) test method for materials
IEC 60695-11-5, Fire hazard testing – Part 11-5: Test flames – Needle-flame test method –
Apparatus, confirmatory test arrangement and guidance
IEC 63522-0, Electrical relays – Tests and measurements – Part 0: Testing – General and
guidance
___________
Under preparation. Stage at the time of publication: IEC CDV 63522-0:2024.

– 6 – IEC 63522-36:2025 © IEC 2025
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 63522-0 apply.
ISO and IEC maintain terminology databases for use in standardization at the following
addresses:
• IEC Electropedia: available at https://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp
4 Test procedure
4.1 General
The fire hazard test ensures that under defined conditions the relay will not cause ignition of
parts, or that a combustible part ignited by the test has a limited duration or extent of burning
without spreading fire by flames or burning/glowing particles falling from the specimen.
The testing shall be conducted in accordance with one or both of the following tests:
a) Glow-wire test as described in IEC 60695-2-10, IEC 60695-2-11, IEC 60695-2-12, and
IEC 60695-2-13 as appropriate;
b) Needle flame test as described in IEC 60695-11-5.
4.2 Glow-wire test
4.2.1 Purpose
The glow-wire test is simulating the effect of thermal stress which can be produced by heat
sources such as glowing parts and overloaded components, in order to assess the risk of fire.
4.2.2 Procedure
4.2.2.1 Preconditioning
If not otherwise specified in the relevant specification, the preconditioning shall be done as
below.
a) Glow-wire flammability test for end-products: IEC 60695-2-11.
b) Glow-wire flammability index (GWFI) test for materials: IEC 60695-2-12.
c) Glow-wire ignition temperature (GWIT) test for materials: IEC 60695-2-13.
4.2.2.2 Glow-wire flammability test for end-products
Glow-wire flammability test method for end-products is according to IEC 60695-2-11.
It is preferred to select the following positions for the glow-wire test points of end products and
the schematic diagram (or picture) of the position of glow-wire can be added in the test report.
a) The position on the relay case close to the contacts (for an example see Figure 1).
b) The position on the relay base close to the contact terminals (for an example see Figure 1).
The position of bottom side for PCB relays is not mandatory.

Key
1, 2 and 3 on the relay case close to the contacts
4 on the relay base close to the contact terminals
Figure 1 – An example to show the test points on relay
4.2.2.3 Glow-wire flammability index (GWFI) test for materials
Glow-wire flammability index (GWFI) test method for materials is according to IEC 60695-2-12.
4.2.2.4 Glow-wire ignition temperature (GWIT) test for materials
Glow-wire ignition temperature (GWIT) test method for materials is according to IEC 60695-2-13.
4.2.3 Conditions to be specified
The following details shall be adopted.
a) The glow-wire is heated to the test temperature specified in the relevant product standard.
This temperature shall be chosen according to the purpose from one of the temperatures
shown in IEC 60695-2-11:2021, Table 1. The minimum test temperature is 650 °C.
b) Test specimens
Glow-wire test specimens for end-products shall apply to IEC 60695-2-11. When the relay
is either too small (see definition of small parts in IEC 60695-2-11) or of an inconvenient
shape to carry out the test, the test is made using a specimen of the respective material
from which the relay is manufactured.
Glow-wire test specimens for material shall apply to IEC 60695-2-12 and IEC 60695-2-13.
The dimensions of the planar sections of the test specimens shall be at least 60 mm in
length and 60 mm in width (measured inside the clamping areas) and shall be provided in
all thicknesses under consideration. The preferred values include 0,4 mm ± 0,05 mm,
0,75 mm ± 0,1 mm, 1,5 mm ± 0,15 mm, 3,0 mm ± 0,2 mm, or 6,0 mm ± 0,4mm and the test
specimen shall have a thickness equal to the nearest preferred value that is no thicker than
the relevant part.
For complex parts with various thickness, both the maximum and the minimum thickness
shall be considered and all the preferred value involved in this range shall be tested.

– 8 – IEC 63522-36:2025 © IEC 2025
c) Number of test specimens
Number of test specimens shall apply to IEC 60695-2-11, IEC 60695-2-12 and
IEC 60695-2-13.
d) Test apparatus are described in IEC 60695-2-10 and in IEC 60695-11-5. Positioning of the
test apparatus apply to IEC 60695-2-11.
4.3 Needle flame test
4.3.1 Purpose
The purpose of the needle flame test is to assess the fire hazards of electrotechnical equipment,
its subassemblies and components, and of solid insulating materials and other combustible
materials through simulation of the effect of small flames which may result from fault conditions
within the equipment.
4.3.2 Procedure
If not otherwise specified in the relevant specification, the preconditioning of test specimens
shall be done according to IEC 60695-11-5.
The test procedure is specified in IEC 60695-11-5. At the beginning of the test, the test flame
shall be positioned so that at least the tip of the flame is in contact with the surface of the
specimen which is most likely to be affected by flames resulting from normal use or from fault
conditions. During the test, the burner shall not be moved. The test flame is removed
immediately after the specified time.
4.3.3 Conditions to be specified
The needle flame test is carried out in accordance with IEC 60695-11-5, and the following
details shall be adopted:
a) The duration of application of the test flame on the specimen is (30 + 1) s. For relay volumes
up to 1 000 mm a reduction to (10 + 1) s may be chosen, however;
b) The test specimen shall be compliant with IEC 60695-11-5;
c) The test apparatus are described in IEC 60695-11-5.
5 Evaluation
5.1 General
5.1.1 Glow-wire test
...