IEC 60297-3-108:2014

IEC 60297-3-108 ®
Edition 1.0 2014-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Mechanical structures for electronic equipment – Dimensions of mechanical
structures of the 482,6 mm (19 in) series –
Part 3-108: Dimensions of R-type subracks and plug-in units

Structures mécaniques pour équipements électroniques – Dimensions des
structures mécaniques de la série 482,6 mm (19 pouces) –
Partie 3-108: Dimensions des bacs de type R et des blocs enfichables

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IEC 60297-3-108 ®
Edition 1.0 2014-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Mechanical structures for electronic equipment – Dimensions of mechanical

structures of the 482,6 mm (19 in) series –

Part 3-108: Dimensions of R-type subracks and plug-in units

Structures mécaniques pour équipements électroniques – Dimensions des

structures mécaniques de la série 482,6 mm (19 pouces) –

Partie 3-108: Dimensions des bacs de type R et des blocs enfichables

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX U
ICS 31.240 ISBN 978-2-8322-1790-0

– 2 – IEC 60297-3-108:2014 © IEC 2014
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 8
4 Arrangement overview . 8
5 RA – type subrack . 9
5.1 General . 9
5.2 RA–type subrack rear mounting dimensions . 11
6 RB–type subrack . 12
6.1 General . 12
6.2 RB–type subrack rear mounting dimensions . 13
7 R–type subrack guide rails . 13
8 Electromagnetic shielding provisions and mounting flanges . 14
9 Chassis integrated subrack . 15
9.1 General . 15
9.2 RA– C–type chassis/subrack . 16
9.3 RB–C–type chassis/subrack . 16
10 Front panel/plug-in unit compatible with RA – type subrack . 17
11 Front panel/plug-in unit compatible with RB – type subrack . 19
12 Injector/extractor handle . 20
13 Printed board dimensions . 20
14 Dimensions. 21
15 Nomenclature . 22
15.1 Reference plane (given in square boxes of figures) . 22
15.2 Dimensions of Table 1 . 22
Annex A (normative) Mounting support . 23
A.1 Chassis/subrack mounting support in cabinets . 23
Annex B (normative) Environmental tests. 24
B.1 Static and dynamic load test . 24
B.2 Seismic test . 24
B.3 Electromagnetic shielding performance test . 24
Annex C (normative) Thermal management . 25
C.1 Air ducting . 25
Annex D (informative) Comparison of IEC 60297-3-101 with IEC 60297-3-108 . 26

Figure 1 – Subrack application . 6
Figure 2 – Arrangement of a R-type subrack and plug-in units . 9
Figure 3 – RA–type subrack front mounting dimensions . 10
Figure 4 – RA–type subrack rear mounting dimensions . 11
Figure 5 – RB–type subrack front mounting dimensions . 12
Figure 6 – RB–type subrack rear mounting dimensions . 13
Figure 7 – R–type subrack guide rails . 14

Figure 8 – R–type subrack front attachment plane and mounting flanges . 15
Figure 9 – RA – C type chassis/subrack . 16
Figure 10 – RB–C – type chassis/subrack . 17
Figure 11 – Front panel/ plug-in unit compatible with RA – type subrack . 18
Figure 12 – Front panel/ plug-in unit compatible with RB – type subrack . 19
Figure 13 – Injector/extractor handle . 20
Figure 14 – Printed board dimensions . 21
Figure A.1 – Subrack/chassis mounting support . 23
Figure C.1 – Thermal management example . 25

Table 1 – Dimensions . 21
Table D.1 – Comparison of dimensions and features . 26

– 4 – IEC 60297-3-108:2014 © IEC 2014
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MECHANICAL STRUCTURES
FOR ELECTRONIC EQUIPMENT –
DIMENSIONS OF MECHANICAL STRUCTURES
OF THE 482,6 mm (19 in) SERIES –

Part 3-108: Dimensions of R-type subracks and plug-in units

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 collabo
...