IEC 60917-2-3:2006

INTERNATIONAL IEC
STANDARD 60917-2-3
First edition
2006-05
Modular order for the development
of mechanical structures
for electronic equipment practices –

Part 2-3:
Sectional specification –
Interface co-ordination dimensions
for the 25 mm equipment practice –
Extended detail specification –
Dimensions for subracks, chassis, backplanes,
front panels and plug-in units

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INTERNATIONAL IEC
STANDARD 60917-2-3
First edition
2006-05
Modular order for the development
of mechanical structures
for electronic equipment practices –

Part 2-3:
Sectional specification –
Interface co-ordination dimensions
for the 25 mm equipment practice –
Extended detail specification –
Dimensions for subracks, chassis, backplanes,
front panels and plug-in units

 IEC 2006  Copyright - all rights reserved
No part of this publication may be reproduced or utilized in any form or by any means, electronic or
mechanical, including photocopying and microfilm, without permission in writing from the publisher.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch Web: www.iec.ch
PRICE CODE
Commission Electrotechnique Internationale V
International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
For price, see current catalogue

– 2 – 60917-2-3  IEC:2006(E)
CONTENTS
FOREWORD.4
INTRODUCTION.6

1 Scope and object.8
2 Normative references .8
3 Terms and definitions .9
4 Arrangement overview.9
5 Subrack dimensions for injector/extractor handle of plug-in units.10
5.1 Subrack interface dimensions.10
6 Dimensions of injector/extractor handle for plug-in units .12
6.1 Injector/extractor handle interface dimensions.12
6.2 Handle-locking function .14
7 Subrack and plug-in units with electromagnetic shielding provision .14
7.1 Subrack interface dimensions for electromagnetic shielding provision .14
7.2 Front panel/plug-in unit interface dimensions .17
8 Key/coding system for subrack and plug-in units .18
8.1 Subrack interface dimensions – Key/coding system on the plug-in unit guides .19
8.2 Key dimensions – Key/coding system on the plug-in unit guides.20
8.3 Programming of key – Key/coding system on the plug-in guides.22
8.4 Keying chamber inspection dimensions .22
9 Alignment pin and/or electrical contact for front panels and plug-in units .23
9.1 Alignment pins and receptacle plates on the subrack horizontal members .24
9.2 Alignment and/or electrical contact pins and receptacles on the subrack
plug-in unit guides.25
10 Electrostatic discharge provision for plug-in units and subracks.27
10.1 ESD contact interface dimensions .28
10.2 ESD strip interface dimensions.28
11 Subrack dimensions for rear-mounted plug-in units .32

Annex A Subrack, plug-in unit and backplane dimensions for using metric connectors.33

Figure 1 – Typical example of large subracks in a wide cabinet, equipped mass
volume of copper/optical cables installation .7
Figure 2 – Subject for development of extended connector application packaging and
key elements of interconnection between functional plug-in modules via backplane in
the future packaging system .7
Figure 3 – Arrangement overview .9
Figure 4 – Subrack interface dimensions, injector/extractor handles for plug-in units .11
Figure 5 – Detail X and detail Y, subrack interface dimensions, injection/extraction
handles for plug-in units.12
Figure 6 – Plug-in units interface dimensions, injection/extraction handle for plug-in units .13
Figure 7 – Detail X and detail Y, plug-in interface dimensions, injector/extractor
handles for plug-in units.14
Figure 8 – Subrack interface dimensions, electromagnetic shielding provisions .15

60917-2-3  IEC:2006(E) – 3 –
Figure 9 – Detail X and detail Y, subrack interface dimensions, electromagnetic
shielding provisions .16
Figure 10 – Front panel/plug-in unit interface dimensions, electromagnetic shielding
provisions .17
Figure 11 – Arrangement of key/coding system for plug-in units.18
Figure 12 – Subrack interface dimensions – Key/coding system on the plug-in unit
guides.19
Figure 13 – Plug-in unit interface dimensions – Key/coding system on the plug-in unit
guides.20
Figure 14 – Key dimensions and rotated key positions – Key/coding system on the
plug-in unit guides .21
Figure 15 – Programming of keys .22
Figure 16 – Arrangement of alignment pin system for subracks and plug-in units.23
Figure 17 – Subrack interface dimensions, alignment pins and receptacle plates on
the horizontal members .24
Figure 18 – Plug-in unit interface dimensions, alignment pins and receptacle plates on
the horizontal members .25
Figure 19 – Subrack interface dimensions, alignment and/or electrical contact pin
receptacles on the plug-in unit guides.26
Figure 20 – Plug-in unit interface dimensions, alignment and/or electrical contact pin
receptacles on the plug-in unit guides.27
Figure 21 – Subrack interface dimensions, ESD contacts on the plug-in guides .28
Figure 22 – Plug-in unit interface dimensions, ESD strips on the plug-in boards .29
Figure 23 – Subrack dimensions for rear mounted plug-in units .32
Figure A.1 – Subrack, plug-in unit and backplane dimensions for using 2,5 mm metric
connectors in accordance with IEC 61076-4-100.33
Figure A.2 – Subrack, plug-in unit and backplane dimensions for using 2 mm metric
connectors in accordance with IEC 61076-4-101.34
Figure A.3 – Subrack, plug-in unit and backplane dimensions for using 2 mm metric
connectors in accordance with IEC 61076-4-104.35

Table 1 – Inspection dimensions of subrack and plug-in unit keying chambers.22
Table 2 – Dimensions of subracks and plug-in units based on IEC 60917-2-2 .30
Table 3 – Dimensions of subracks and boards for rear-mounted plug-in units .32

– 4 – 60917-2-3  IEC:2006(E)
INTERNATIONAL ELECTROTECHNICAL COMMISION
___________
MODULAR ORDER FOR THE DEVELOPMENT
OF MECHANICAL STRUCTURES
FOR ELECTRONIC EQUIPMENT PRACTICES –

Part 2-3: Sectional specification – Interface co-ordination dimensions
for the 25 mm equipment practice – Extended detail specification –
Dimensions for subracks, chassis, backplanes, front panels
and plug-in units
FOREWORD
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