EN 60917-2:1994

SLOVENSKI STANDARD
01-september-2002
Modular order for the development of mechanical structures for electronic
equipment practices - Part 2: Sectional specification - Interface co-ordination
dimensions for the 25 mm equipment practice (IEC 60917-2:1992)
Modular order for the development of mechanical structures for electronic equipment
practices -- Part 2: Sectional specification - Interface co-ordination dimensions for the 25
mm equipment practice
Modulordnung für die Entwicklung von Bauweisen für elektronische Einrichtungen -- Teil
2: Strukturnorm Schnittstellen-Koordinationsmaße für die 25-mm-Bauweise
Ordre modulaire pour le développement des structures mécaniques pour les
infrastructures électroniques -- Partie 2: Spécification intermédiaire - Dimensions de
coordination pour les interfaces des infrastructures au pas de 25 mm
Ta slovenski standard je istoveten z: EN 60917-2:1994
ICS:
31.240 Mehanske konstrukcije za Mechanical structures for
elektronsko opremo electronic equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

NORME CEI
IEC
INTERNATIONALE
917-2
INTERNATIONAL
Première édition
STANDARD First edition
1992-06
Ordre modulaire pour le développement
mécaniques pour
des structures
infrastructures électroniques
les
Partie 2:
Spécification intermédiaire —
de coordination pour les interfaces
Dimensions
des infrastructures au pas de 25 mm
Modular order for the development
of mechanical structures for electronic
equipment practices
Part 2:
—
Sectional specification
Interface co-ordination dimensions for the 25 mm
equipment practice
Copyright — all rights reserved
© CEI 1992 Droits de reproduction réservés —
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in any form or by any means, electronic or mechanical,
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including photocopying and mi crofilm, without permission
microfilms, sans l'accord écrit de l'éditeur.
in writing from the publisher
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917-2©IEC - 3 -
CONTENTS
Page
FOREWORD 5
INTRODUCTION 7
Clause
1 Scope and object 9
2 Normative references 11
3 Terminology
3.1 Special word usage
11 3.2 Definitions
4 Structuring
5 Arrangement of the equipment practice
6 Co-ordination dimensions for cabinets and racks 19
6.1 Dimensioning of pitches
6.2 Co-ordination dimensions
6.2.1 Height dimensions (cabinets and racks)
6.2.2 Width dimensions (cabinets and racks) 23
6.2.3 Depth dimensions (cabinets and racks) 25
6.3 Selection of co-ordination dimensions
7 Co-ordination dimensions for subracks
7.1 29 Height dimensions (subracks)
7.2 31 Width dimensions (subracks)
7.3 31 Depth dimensions (subracks)
8 Chassis 33
9 Plug-in units
10 Printed board dimensions
11 Backplane dimensions 33
917-2©IEC – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
MODULAR ORDER FOR THE DEVELOPMENT
OF MECHANICAL STRUCTURES
FOR ELECTRONIC EQUIPMENT PRACTICES
Part 2: Sectional specification -
Interface co-ordination dimensions
for the 25 mm equipment practice
FOREWORD
1) The formal decisions or agreements of the IEC on technical matters, prepared by Technical Committees on
which all the National Committees having a special interest therein are represented, express, as nearly as
possible, an international consensus of opinion on the subjects dealt with.
2) They have the form of recommendations for international use and they are accepted by the National
Committees in that sense.
3) In order to promote international unification, the IEC expresses the wish that all National Committees
should adopt the text of the IEC recommendation for their national rules in so far as national conditions will
permit. Any divergence between the IEC recommendation and the corresponding national rules should, as
far as possible, be clearly indicated in the latter.
This part of International Standard IEC 917 has been prepared by IEC Sub-Committee
48D: Mechanical structures for electronic equipment, of IEC Technical Committee No. 48:
Electromechanical components for electronic equipment.
This standard forms Pa
rt 2 of IEC 917.
The text of this part is based on the following documents:
Six Months' Rule Reports on Voting
48D(CO)22 48D(CO)26
48D(CO)23 48D(CO)27
Full information on the voting for the approval of this part can be found in the Voting
Repo rts indicated in the above table.
In a forthcoming revision, IEC 916 (1988), IEC 917 (1988) and IEC 917-0 (1989) will be
the object of IEC 917-1: Generic specification.

917-2©IEC –7
INTRODUCTION
This part of IEC 917 is in accordance with the rules of the modular order determined in
IEC 917, which is based on IEC Guide 103.
This part of IEC 917 specifies the co-ordination dimensions of a metric equipment practice
containing a range of interface dimensions for cabinets, racks, subracks and chassis so
that dimensional compatibility can be achieved where cabinets, racks, subracks and
chassis of standard height, width and depth are installed in electronic equipment.

917-2©IEC – 9 –
MODULAR ORDER FOR THE DEVELOPMENT
OF MECHANICAL STRUCTURES
FOR ELECTRONIC EQUIPMENT PRACTICES
Part 2: Sectional specification -
Interface co-ordination dimensions
for the 25 mm equipment practice
1 Scope and object
This part of IEC 917 may be applied to all fields of electronics in which equipment and
installations with a modular design are used.
The object of this pa of IEC 917 is to define a sectional specification for the mechanical
rt
structure of a 25 mm equipment practice to provide for dimensional compatibility at
mechanical inte rfaces with related engineering applications, e.g. plug-in units, printed
boards, components, instrumentation, furniture, rooms, buildings, etc.
It specifies the co-ordination dimensions and pitches for cabinets, racks, subracks and
chassis of all types used for electronic equipment in, for example industrial electronics,
information technology, measurement and control systems and communications.
The chosen co-ordination dimensions for the mechanical structure for heights, widths and
depths, lie within a homogeneous, metric modular three-dimensional grid as specified in
IEC 917. In this pa rt of IEC 917, the mounting pitches 25 mm and 2,5 mm have been used
as a base to determine the inte rface co-ordination dimensions for the electronic equipment
practice.
This creates the optimum conditions for the application of computer-aided methods
throughout design and manufacture such as, for instance, computer-aided planning,
development, manufacturing, testing and installation.
The cabinets and racks in this part of IEC 917 represent a specific structural form which
takes into consideration for instance the installation of subracks and chassis.
The determined inte ace co-ordination dimensions for the overall outside and ape rture
rf
dimensions of subracks provide space for independently created plug-in units to be installed.
These plug-in unit dimensions shall follow the rules of IEC 917-0 and IEC 917 and are to be
determined in detail specifications. The connector system used (0,5; 1,0; 2,0; 2,5 •mm, etc.
connector grid) and the special application requirements are to be determined in associated
detail specifications.
Further standards may be used in conjunction with this pa rt of IEC 917:
IEC 297-1: 1986, Dimensions of mechanical structures of the 482,6 mm (19 inch) series –
Part 1: Panels and racks.
IEC 297-2: 1982, Dimensions of mechanical structures of the 482,6 mm (19 inch) series –
Part 2: Cabinets and pitches of rack structures.

917-2 ©IEC -11 -
2 Normative references
The following normative documents contain provisions which, through reference in this
of IEC 917. At the time of publication, the editions
text, constitute provisions of this pa rt
rties to
indicated were valid. All normative documents are subject to revision, and pa
of IEC 917 are encouraged to investigate the possibility of
agreements based on this pa rt
applying the most recent editions of the normative documents indicated below. Members
of IEC and ISO maintain registers of currently valid International Standards.
Dimensions of mechanical structures of the 482,6 mm (19 in) series -
IEC 297-3: 1984,
Part 3: Subracks and associated plug-in units.
Mechanical structures for electronic equipment. Terminology.
IEC 916: 1988,
Modular order for the development of mechanical structures for electronic
IEC 917: 1988,
equipment practices.
Modular order for the development of mechanical structures for
IEC 917-0: 1989,
0: Guide for the users of Publication !EC 917.
rt
electronic equipment practices - Pa
3 Terminology
rt
of
The terms and definitions specified in IEC 916 and IEC 917 have been used in this pa
IEC 917. In addition, the following shall apply.
3.1 Special word usage
Shall: key word indicates a mandatory requirement.
key word indicates flexibility of choice with a strong preference
Should:
implementation.
key word indicates flexibility of choice with no implied preference.
- May:
3.2 Definitions
Usable space between features.
aperture dimension:
Reference dimension used to co-ordinate mechanical
co-ordination dimension:
interfaces (see IEC 917).
s or assemblies in a given space.
mounting pitch: Pitch used to arrange pa rt
n: Multiplier having integer values of range continuing 1, 2, 3, 4, .
Theoretical plane having no thickness or tolerance, used to separate
reference plane:
space. (see IEC 917 and IEC 917-0).

placing cabinets or racks on top of one another in a
Stacking:
given height.
- Pitch dimensions P: co-ordination dimensions for the height, width and depth of
cabinets or racks used to determine the mechanical
interfaces in the case of suite arrangement or of stacking of
cabinets or racks (see figure 4).

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