IEC 60917-1:2019

IEC 60917-1 ®
Edition 2.0 2019-09
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Modular order for the development of mechanical structures for electrical and
electronic equipment practices –
Part 1: Generic standard
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IEC 60917-1 ®
Edition 2.0 2019-09
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Modular order for the development of mechanical structures for electrical and

electronic equipment practices –

Part 1: Generic standard
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 31.240 ISBN 978-2-8322-7416-3

– 2 – IEC 60917-1:2019 RLV © IEC 2019
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope and object . 8
2 Normative references . 8
3 Terms, terminology and definitions . 11
4 Fundamentals and background information . 22
4.1 General . 22
4.2 Structures of electrical and electronic equipment practices . 22
4.3 Dimensional co-ordination with adjacent technical fields . 23
4.4 Preparation of standards for new equipment practices . 25
5 Modular order details . 28
5.1 Modular grid . 28
5.2 Pitches . 28
5.2.1 Base and multiple pitches for equipment practice . 28
5.2.2 Mounting pitches example . 29
5.3 Co-ordination dimensions . 30
5.4 Illustration of the modular order . 31

Figure 1 – Pitch . 12
Figure 2 – Grid. 13
Figure 3 – Rack . 14
Figure 4 – Cabinet . 14
Figure 5 – Case . 15
Figure 6 – Swing frame . 15
Figure 7 – Subrack . 16
Figure 8 – Chassis . 16
Figure 9 – Plug-in unit. 17
Figure 10 – Console. 17
Figure 11 – Plug-in unit guide . 18
Figure 12 – Slides . 18
Figure 13 – Telescopic slides . 19
Figure 14 – Mounting frame . 19
Figure 15 – Mounting plate . 20
Figure 16 – Front panel . 20
Figure 17 – Backplane . 20
Figure 18 – Cabinet panel . 21
Figure 19 – Door . 21
Figure 20 – Mounting section . 22
Figure 21 – Structures levels of electrical and electronic equipment practices. 23
Figure 22 – Structure of equipment practice standards . 27
Figure 23 – Modular grid . 28
Figure 24 – Partitioning of co-ordination dimensions C with the same mounting pitch mp . 30
Figure 25 – Examples of the application of the modular order . 32

Table 1 – Publications containing standardized modular dimensions and/or related
documents . 24
Table 2 – Co-ordination dimensions C . 30
i
– 4 – IEC 60917-1:2019 RLV © IEC 2019
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MODULAR ORDER FOR THE DEVELOPMENT
OF MECHANICAL STRUCTURES FOR ELECTRICAL
AND ELECTRONIC EQUIPMENT PRACTICES –

Part 1: Generic standard
FOREWORD
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International Standard IEC 60917-1 has been prepared by subcommittee 48D: Mechanical
structures for electrical and electronic equipment, of IEC technical committee 48: Electrical
connectors and mechanical structures for electrical and electronic equipment.
This second edition cancels and replaces the first edition published in 1998 and its Amendment
1:2000. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) added information on newly developed detail specification standards of mechanical
structures for the electrical and electronic equipment practices;
b) added information on newly developed performance test standards for the verifications of
environmental performances and safety aspects and issues of the thermal performance and
thermal management for the electrical and electronic equipment practices;
c) introduced the relations between the mechanical structure for electrical and electronic
system, the verification of environmental performance and safety aspects and issues of the
thermal performance and thermal management for the electrical and electronic equipment
practices.
The text of this standard is based on the following documents:
FDIS Report on voting
48D/703/FDIS 48D/708/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.
Future standards in this series will carry the new general title as cited above. Titles of existing
standards in this series will be updated at the time of the next edition.
A list of all parts in the IEC 60917 series, published under the general title Modular order for
...