IEC 63356-2:2022

IEC 63356-2 ®
Edition 1.0 2022-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
LED light source characteristics –
Part 2: Design parameters and values

Caractéristiques de source lumineuse à LED –
Partie 2: Paramètres et valeurs de conception

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IEC 63356-2 ®
Edition 1.0 2022-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
LED light source characteristics –

Part 2: Design parameters and values

Caractéristiques de source lumineuse à LED –

Partie 2: Paramètres et valeurs de conception

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.140.99 ISBN 978-2-8322-5888-0

– 2 – IEC 63356-2:2022 © IEC 2022
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 Overview and common information . 8
4.1 General . 8
4.2 Numbering system . 8
5 Rectangular LED modules with undefined light emitting surface. 8
5.1 General . 8
5.2 Mechanical references . 8
5.3 LED module categories . 9
5.3.1 General . 9
5.3.2 L6W6 . 9
5.3.3 L14W2 . 11
5.3.4 L28W2 . 12
5.3.5 L28W4 . 13
5.3.6 L28W6 . 14
5.3.7 L28W28 . 15
5.3.8 L38W38 . 17
5.3.9 L56W56 . 19
5.3.10 L56W2 . 21
5.3.11 L56W4 . 22
5.3.12 L112W2 . 23
5.3.13 L115W2 . 25
5.3.14 L140W2 . 27
5.3.15 L145W2 . 29
5.3.16 L30W1 . 31
5.3.17 L58W1 . 32
5.3.18 L115W1 . 33
5.3.19 L145W1 . 34
Bibliography . 35

Figure 1 – Example of a luminaire with two LED modules . 8
Figure 2 – Positions of the reference point and the reference plane of the LED module . 8
Figure 3 – LED module demarcation of the L6W6 category . 10
Figure 4 – LED module demarcation of the L14W2 category . 11
Figure 5 – LED module demarcation of the L28W2 category . 12
Figure 6 – LED module demarcation of the L28W4 category . 13
Figure 7 – LED module demarcation of the L28W6 category . 14
Figure 8 – LED module demarcation of the L28W28 category . 16
Figure 9 – LED module demarcation of the L38W38 category . 18
Figure 10 – LED module demarcation of the L56W56 category . 20
Figure 11 – LED module demarcation of the L56W2 category . 21
Figure 12 – LED module demarcation of the L56W4 category . 22

Figure 13 – LED module demarcation of the L112W2 category . 24
Figure 14 – LED module demarcation of the L115W2 category . 26
Figure 15 – LED module demarcation of the L140W2 category . 28
Figure 16 – LED module demarcation of the L145W2 category . 30
Figure 17 – LED module demarcation of the L30W1 category . 31
Figure 18 – LED module demarcation of the L58W1 category . 32
Figure 19 – LED module demarcation of the L115W1 category . 33
Figure 20 – LED module demarcation of the L145W1 category . 34

Table 1 – LED module demarcation of the L6W6 category . 9
Table 2 – LED module demarcation of the L14W2 category . 11
Table 3 – LED module demarcation of the L28W2 category . 12
Table 4 – LED module demarcation of the L28W4 category . 13
Table 5 – LED module demarcation of the L28W6 category . 14
Table 6 – LED module demarcation of the L28W28 category . 15
Table 7 – LED module demarcation of the L38W38 category . 17
Table 8 – LED module demarcation of the L56W56 category . 19
Table 9 – LED module demarcation of the L56W2 category . 21
Table 10 – LED module demarcation of the L56W4 category . 22
Table 11 – LED module demarcation of the L112W2 category. 23
Table 12 – LED module demarcation of the L115W2 category. 25
Table 13 – LED module demarcation of the L140W2 category. 27
Table 14 – LED module demarcation of the L145W2 category. 29

– 4 – IEC 63356-2:2022 © IEC 2022
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
LED LIGHT SOURCE CHARACTERISTICS –

Part 2: Design parameters and values

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
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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.
IEC 63356-2 has been prepared by subcommittee 34A: Electric light sources, of IEC technical
committee 34: Lighting. It is an International Standard.
The text of this International Standard is based on the following documents:
Draft Report on voting
34A/2298/FDIS 34A/2313/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.
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 in the IEC 63356 series, published under the general title LED light source
characteristics, 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,
• replaced by a revised edition, or
• amended.
IMPORTANT – The "colour inside" logo on the cover page of this document 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.

– 6 – IEC 63356-2:2022 © IEC 2022
INTRODUCTION
The IEC 63356 series – (LED light source characteristics) is split into two parts:
• Part 1: Data sheets
The scope of Part 1 covers data sheets that are comprehensive specifications for unique
LED light sources (LED lamp or LED module). These are full specifications for products
including, where necessary, information on interchangeability aspects, for example
mechanical, electrical, optical.
Each data sheet in Part 1 relates to an individual type of LED lamp or LED module.
• Part 2: Design parameters and values
The scope of Part 2 covers design parameters and values that are used in the design of an
LED light source (LED lamp or LED module) or a related component. Part 2 does not provide
full product specifications but includes important interface aspects (e.g. mechanical,
electrical, optical) that should be taken account of in the design of LED light sources and
related components.
LED LIGHT SOURCE CHARACTERISTICS –

Part 2: Design parameters and values

1 Scope
This part of IEC 63356 specifies design parameters and design values of an LED light source
or related interface characteristics.
NOTE 1 Interface characteristics can cover interfaces between the LED light source and the luminaire or the
controlgear, or the LED light source and additional attachments.
NOTE 2 Interfaces can be related to for example electrical, mechanical, or optical aspects.
This document does not cover interchangeability between products from different LED light
source manufacturers.
NOTE 3 Interchangeability is covered by IEC 63356-1.
Lamp caps and lampholders specified in the IEC 60061 series are not within the scope of this
document.
for
Compliance criteria relating to parameters in this document are covered by IEC 63220
safety, or IEC 63221 for performance.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
For the purposes of this document, the following terms and definitions 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
3.1
thermal interface material
TIM
material with specified thermal conductivity assembled between an LED module and a luminaire
to enable improved heat dissipation
___________
Under consideration.
Under consideration.
– 8 – IEC 63356-2:2022 © IEC 2022
4 Overview and common information
4.1 General
Unless otherwise specified, mechanical dimensions refer to a temperature of (25 ± 5) °C.
All values of dimensions that omit an explicit unit indication are in millimetres.
4.2 Numbering system
Products that have comparable interfaces are grouped in separate clauses.
5 Rectangular LED modules with undefined light emitting surface
NOTE Clause 5 is derived from Zhaga Book 7 Edition 1.7.
5.1 General
Rectangular LED modules with undefined light emitting surface (LES) are intended to be
mounted in a luminaire. Figure 1 illustrates an example of an LED module-luminaire
combination. In this example the luminaire holds two LED modules. In practice, a luminaire can
hold any number of LED modules.

Figure 1 – Example of a luminaire with two LED modules
The luminaire typically features luminaire-optics which shape the light output of the LED
module(s).
5.2 Mechanical references
The reference plane and the reference point of an LED module, including (optional) TIM are
defined in Figure 2. Dimensions are specified relative to either the reference point or the
reference plane unless indicated otherwise. Moreover, dimensions are specified to include the
thickness of the TIM (if present).

Figure 2 – Positions of the reference point and the reference plane of the LED module

5.3 LED module categories
5.3.1 General
Subclause 5.3 specifies a number of LED module categories that are identified by a designation.
The LED module demarcations of these LED module categories are specified in 5.3.2 to 5.3.19.
The intention of the demarcation model is to visualize restricted areas or volumes that no part
of a luminaire should cross. The hashed area indicates limits for the inclusion zone for LED
module design and the exclusion zone for luminaire design.
Unless stated otherwise, all holes are available and for each hole at least 25 % of the
circumference of the hole is present in the LED module. The demarcation model specifies the
minimum diameter of the mounting holes at a specified position.
NOTE In typical designs the diameter of these holes can be larger allowing for a tolerance on the position of the
holes.
In case the LED module is applied in combination with a TIM, this material is defined to be part
of the LED module. Thus, the total height of the module and TIM should not exceed the
maximum height H (see 5.3.2 to 5.3.19).
5.3.2 L6W6
The designation for this category is 'L6W6'.
The LED module demarcation of the L6W6 category is defined in Table 1 and Figure 3.
Table 1 – LED module demarcation of the L6W6 category
Dimension Value
L 60
W 60
H 20
a 48
b 48
M 20
P 35
Øc 4,3
– 10 – IEC 63356-2:2022 © IEC 2022

NOTE The top drawing shows the detail X.
Figure 3 – LED module demarcation of the L6W6 category
The X-axis and Y-axis are the symmetry axes for the outline and the mounting holes.

5.3.3 L14W2
The designation for this category is 'L14W2'.
The LED module demarcation of the L14W2 category is defined in Table 2 and Figure 4.
Table 2 – LED module demarcation of the L14W2 category
Dimension Value
L 140
W 24
H 20
a 110
b 18,4
d 15
Øc 4,3
NOTE The top drawing shows the detail X.
Figure 4 – LED module demarcation of the L14W2 category
The X-axis and Y-axis are the symmetry axes for the outline and the crosshair lines of the
mounting holes.
– 12 – IEC 63356-2:2022 © IEC 2022
5.3.4 L28W2
The designation for this category is 'L28W2'.
The LED module demarcation of the L28W2 category is defined in Table 3 and Figure 5. The
two mounting holes at the bottom of the diagram of Figure 5 are optional.
Table 3 – LED module demarcation of the L28W2 category
Dimension Value
L 280
W 24
H 20
a 125
b 18,4
Øc 4,3
NOTE The top drawing shows the detail X.
Figure 5 – LED module demarcation of the L28W2 category
The X-axis is the symmetry axis for the outline and the crosshair lines of the mounting holes.
The Y-axis is the symmetry axis for the outline and mounting holes.

5.3.5 L28W4
The designation for this category is 'L28W4'.
The LED module demarcation of the L28W4 category is defined in Table 4 and Figure 6.
Table 4 – LED module demarcation of the L28W4 category
Dimension Value
L 281
W 41
H 20
a 110
b 31
Øc 4,3
NOTE The top drawing shows the detail X.
Figure 6 – LED module demarcation of the L28W4 category
The X-axis is the symmetry axis for the outline and the crosshair lines of the mounting holes.
The Y-axis is the symmetry axis for the outline and mounting holes.

– 14 – IEC 63356-2:2022 © IEC 2022
5.3.6 L28W6
The designation for this category is 'L28W6'.
The LED module demarcation of the L28W6 category is defined in Table 5 and Figure 7.
Table 5 – LED module demarcation of the L28W6 category
Dimension Value
L 281
W 61
H 20
a 91
b 40
Øc 4,3
d 11
e 15
NOTE The top drawing shows the detail X.
Figure 7 – LED module demarcation of the L28W6 category
The X-axis is the symmetry axis for the outline and the crosshair lines of the mounting holes.
The Y-axis is the symmetry axis for the outline and the leftmost and rightmost mounting holes.

5.3.7 L28W28
The designation for this category is 'L28W28'.
The LED module demarcation of the L28W28 category is defined in Table 6 and Figure 8.
Table 6 – LED module demarcation of the L28W28 category
Dimension Value
L 281
W 281
H 20
a 222
b 180
Øc 4,3
– 16 – IEC 63356-2:2022 © IEC 2022

NOTE The top drawing shows the detail X.
Figure 8 – LED module demarcation of the L28W28 category
The X-axis and Y-axis are the symmetry axes for the outline and the mounting holes.

5.3.8 L38W38
The designation for this category is 'L38W38'.
The LED module demarcation of the L38W38 category is defined in Table 7 and Figure 9.
Mounting holes not being in the corners of the LED module are optional.
Table 7 – LED module demarcation of the L38W38 category
Dimension Value
L 381
W 381
H 20
a 371,9
a1 21,3
b 67,2
Øc 4,3
– 18 – IEC 63356-2:2022 © IEC 2022

NOTE The top drawing shows the detail X.
Figure 9 – LED module demarcation of the L38W38 category
The X-axis is the symmetry axis for the outline and the mounting holes.
The Y-axis is the symmetry axis for the outline and the crosshair lines of mounting holes.

5.3.9 L56W56
The designation for this category is 'L56W56'.
The LED module demarcation of the L56W56 category is defined in Table 8 and Figure 10.
Table 8 – LED module demarcation of the L56W56 category
Dimension Value
L 562
W 562
H 20
a 503
b 461
Øc 4,3
– 20 – IEC 63356-2:2022 © IEC 2022

NOTE The top drawing shows the detail X.
Figure 10 – LED module demarcation of the L56W56 category
The X-axis and Y-axis are the symmetry axes for the outline and the mounting holes.

5.3.10 L56W2
The designation for this category is 'L56W2'.
The LED module demarcation of the L56W2 category is defined in Table 9 and Figure 11. The
four mounting holes at the bottom of the diagram of Figure 11 are optional.
Table 9 – LED module demarcation of the L56W2 category
Dimension Value
L 560
W 24
H 20
a 125
b 18,4
d 30
Øc 4,3
NOTE The top drawing shows the detail X.
Figure 11 – LED module demarcation of the L56W2 category
The X-axis is the symmetry axis for the outline and the crosshair lines of the mounting holes.
The Y-axis is the symmetry axis for the outline and mounting holes.

– 22 – IEC 63356-2:2022 © IEC 2022
5.3.11 L56W4
The designation for this category is 'L56W4'.
The LED module demarcation of the L56W4 category is defined in Table 10 and Figure 12.
Table 10 – LED module demarcation of the L56W4 category
Dimension Value
L 561
W 41
H 20
a 110
b 31
Øc 4,3
d 61
NOTE The top drawing shows the detail X.
Figure 12 – LED module demarcation of the L56W4 category
The X-axis is the symmetry axis for the outline and the crosshair lines of the mounting holes.
The Y-axis is the symmetry axis for the outline and mounting holes.

5.3.12 L112W2
The designation for this category is 'L112W2'.
The LED module demarcation of the L112W2 category is defined in Table 11 and Figure 13.
Table 11 – LED module demarcation of the L112W2 category
Dimension Value
L 1 120
W 24
H 20
a 125
b 18,4
Øc 4,3
d 30
e 155
– 24 – IEC 63356-2:2022 © IEC 2022

NOTE The left drawing shows the detail X.
Figure 13 – LED module demarcation of the L112W2 category
The X-axis and Y-axis are the symmetry axes for the outline and the mounting holes.

5.3.13 L115W2
The designation for this category is 'L115W2'.
The LED module demarcation of the L115W2 category is defined in Table 12 and Figure 14.
Table 12 – LED module demarcation of the L115W2 category
Dimension Value
L 1 150
W 24
H 20
a 125
b 18,4
Øc 4,3
d 30
e 155
– 26 – IEC 63356-2:2022 © IEC 2022

NOTE The left drawing shows the detail X.
Figure 14 – LED module demarcation of the L115W2 category
The X-axis and Y-axis are the symmetry axes for the outline and the mounting holes.

5.3.14 L140W2
The designation for this category is 'L140W2'.
The LED module demarcation of the L140W2 category is defined in Table 13 and Figure 15.
Table 13 – LED module demarcation of the L140W2 category
Dimension Value
L 1 400
W 24
H 20
a 125
b 18,4
Øc 4,3
d 30
e 155
– 28 – IEC 63356-2:2022 © IEC 2022

NOTE The left drawing shows the detail X.
Figure 15 – LED module demarcation of the L140W2 category
The X-axis and Y-axis are the symmetry axes for the outline and the mounting holes.

5.3.15 L145W2
The designation for this category is 'L145W2'.
The LED module demarcation of the L145W2 category is defined in Table 14 and Figure 16.
Table 14 – LED module demarcation of the L145W2 category
Dimension Value
L 1 450
W 24
H 20
a 125
b 18,4
Øc 4,3
d 30
e 155
– 30 – IEC 63356-2:2022 © IEC 2022

NOTE The left drawing shows the detail X.
Figure 16 – LED module demarcation of the L145W2 category
The X-axis and Y-axis are the symmetry axes for the outline and the mounting holes.

5.3.16 L30W1
The designation for this category is 'L30W1'.
The LED module demarcation of the L30W1 category is defined in Figure 17.

Figure 17 – LED module demarcation of the L30W1 category
The X-axis and Y-axis are the symmetry axes for the outline.

– 32 – IEC 63356-2:2022 © IEC 2022
5.3.17 L58W1
The designation for this category is 'L58W1'.
The LED module demarcation of the L58W1 category is defined in Figure 18.

NOTE The X-axis is not to scale.
Figure 18 – LED module demarcation of the L58W1 category
The X-axis and Y-axis are the symmetry axes for the outline.

5.3.18 L115W1
The designation for this category is 'L115W1'.
The LED module demarcation of the L115W1 category is defined in Figure 19.

NOTE The X-axis is not to scale.
Figure 19 – LED module demarcation of the L115W1 category
The X-axis and Y-axis are the symmetry axes for the outline.

– 34 – IEC 63356-2:2022 © IEC 2022
5.3.19 L145W1
The designation for this category is 'L145W1'.
The LED module demarcation of the L145W1 category is defined in Figure 20.

NOTE The X-axis is not to scale.
Figure 20 – LED module demarcation of the L145W1 category
The X-axis and Y-axis are the symmetry axes for the outline.

Bibliography
IEC 60061 (all parts), Lamp caps and holders together with gauges for the control of
interchangeability and safety, available at http://std.iec.ch/iec60061
IEC 63220 , LED Light sources – Safety requirements
IEC 63221 , LED Light sources – Performance requirements
IEC 63356-1, LED light source characteristics – Data sheets
Zhaga interface specification Book 7: Edition 1.7, April 2021 – Rectangular LED Module with
undefined LES
___________
___________
Under consideration.
Under consideration.
– 36 – IEC 63356-2:2022 © IEC 2022
SOMMAIRE
AVANT-PROPOS . 38
INTRODUCTION . 40
1 Domaine d'application . 41
2 Références normatives . 41
3 Termes et définitions . 41
4 Vue d'ensemble et informations communes . 42
4.1 Généralités . 42
4.2 Système de numérotation . 42
5 Modules de LED rectangulaires avec une surface électroluminescente non définie . 42
5.1 Généralités . 42
5.2 Références mécaniques . 42
5.3 Catégories de modules de LED . 43
5.3.1 Généralités . 43
5.3.2 L6W6 . 43
5.3.3 L14W2 . 45
5.3.4 L28W2 . 46
5.3.5 L28W4 . 47
5.3.6 L28W6 . 48
5.3.7 L28W28 . 49
5.3.8 L38W38 . 51
5.3.9 L56W56 . 53
5.3.10 L56W2 . 55
5.3.11 L56W4 . 56
5.3.12 L112W2 . 57
5.3.13 L115W2 . 59
5.3.14 L140W2 . 61
5.3.15 L145W2 . 63
5.3.16 L30W1 . 65
5.3.17 L58W1 . 66
5.3.18 L115W1 . 67
5.3.19 L145W1 . 68
Bibliographie . 69

Figure 1 – Exemple de luminaire avec deux modules de LED . 42
Figure 2 – Position du point de référence et du plan de référence du module de LED . 43
Figure 3 – Démarcation du module de LED de la catégorie L6W6 . 44
Figure 4 – Démarcation du module de LED de la catégorie L14W2 . 45
Figure 5 – Démarcation du module de LED de la catégorie L28W2 . 46
Figure 6 – Démarcation du module de LED de la catégorie L28W4 . 47
Figure 7 – Démarcation du module de LED de la catégorie L28W6 . 48
Figure 8 – Démarcation du module de LED de la catégorie L28W28 . 50
Figure 9 – Démarcation du module de LED de la catégorie L38W38 . 52
Figure 10 – Démarcation du module de LED de la catégorie L56W56 . 54
Figure 11 – Démarcation du module de LED de la catégorie L56W2 . 55
Figure 12 – Démarcation du module de LED de la catégorie L56W4 . 56

Figure 13 – Démarcation du module de LED de la catégorie L112W2 . 58
Figure 14 – Démarcation du module de LED de la catégorie L115W2 . 60
Figure 15 – Démarcation du module de LED de la catégorie L140W2 . 62
Figure 16 – Démarcation du module de LED de la catégorie L145W2 . 64
Figure 17 – Démarcation du module de LED de la catégorie L30W1 . 65
Figure 18 – Démarcation du module de LED de la catégorie L58W1 . 66
Figure 19 – Démarcation du module de LED de la catégorie L115W1 . 67
Figure 20 – Démarcation du module de LED de la catégorie L145W1 . 68

Tableau 1 – Démarcation du module de LED de la catégorie L6W6 . 43
Tableau 2 – Démarcation du module de LED de la catégorie L14W2 . 45
Tableau 3 – Démarcation du module de LED de la catégorie L28W2 . 46
Tableau 4 – Démarcation du module de LED de la catégorie L28W4 . 47
Tableau 5 – Démarcation du module de LED de la catégorie L28W6 . 48
Tableau 6 – Démarcation du module de LED de la catégorie L28W28 . 49
Tableau 7 – Démarcation du module de LED de la catégorie L38W38 . 51
Tableau 8 – Démarcation du module de LED de la catégorie L56W56 . 53
Tableau 9 – Démarcation du module de LED de la catégorie L56W2 . 55
Tableau 10 – Démarcation du module de LED de la catégorie L56W4 . 56
Tableau 11 – Démarcation du module de LED de la catégorie L112W2 . 57
Tableau 12 – Démarcation du module de LED de la catégorie L115W2 . 59
Tableau 13 – Démarcation du module de LED de la catégorie L140W2 . 61
Tableau 14 – Démarcation du module de LED de la catégorie L145W2 . 63

– 38 – IEC 63356-2:2022 © IEC 2022
COMMISSION ÉLECTROTECHNIQUE INTERNATIONALE
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CARACTÉRISTIQUES DE SOURCE LUMINEUSE À LED –

Partie 2: Paramètres et valeurs de conception

AVANT-PROPOS
1) La Commission Electrotechnique Internationale (IEC) est une organisation mondiale de normalisation composée
de l'ensemble des comités électrotechniques nationaux (Comités nationaux de l'IEC). L'IEC a pour objet de
favoriser la coopération internationale pour toutes les questions de normalisation dans les domaines de
l'électricité et de l'électronique. A cet effet, l'IEC – entre autres activités – publie des Normes internationales,
des Spécifications techniques, des Rapports techniques, des Spécifications accessibles au public (PAS) et des
Guides (ci-après dénommés "Publication(s) de l'IEC"). Leur élaboration est confiée à des comités d'études, aux
travaux desquels tout Comité national intéressé par le sujet traité peut participer. Les organisations
internationales, gouvernementales et non gouvernementales, en liaison avec l'IEC, participent également aux
travaux. L'IEC collabore étroitement avec l'Organisation Internationale de Normalisation (ISO), selon des
conditions fixées par accord entre les deux organisations.
2) Les décisions ou accords officiels de l'IEC concernant les questions techniques représentent, dans la mesure du
possible, un accord international sur les sujets étudiés, étant donné que les Comités nationaux de l'IEC intéressés
sont représentés dans chaque comité d'études.
3) Les Publications de l'IEC se présentent sous la forme de recommandations internatio
...