SIST EN 60297-3-108:2015

SLOVENSKI STANDARD
01-september-2015
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Bauweisen für elektronische Einrichtungen - Maße der 482,6-mm-(19-in-)Bauweise - Teil
3-108: Maße von Baugruppenträgern und steckbaren Baugruppen Typ R
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
Ta slovenski standard je istoveten z: EN 60297-3-108:2015
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.

EUROPEAN STANDARD EN 60297-3-108

NORME EUROPÉENNE
EUROPÄISCHE NORM
January 2015
ICS 31.240
English Version
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
(IEC 60297-3-108:2014)
Structures mécaniques pour équipements électroniques - Bauweisen für elektronische Einrichtungen - Maße der
Dimensions des structures mécaniques de la série 482,6 482,6-mm-(19-in-)Bauweise - Teil 3-108: Maße von
mm (19 pouces) - Partie 3-108: dimensions des bacs de Baugruppenträgern und steckbaren Baugruppen Typ R
type r et des blocs enfichables (IEC 60297-3-108:2014)
(IEC 60297-3-108:2014)
This European Standard was approved by CENELEC on 2014-10-14. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2015 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 60297-3-108:2015 E

Foreword
The text of document 48D/565/FDIS, future edition 1 of IEC 60297-3-108, prepared by SC 48D,
"Mechanical structures for electronic equipment", of IEC TC 48, "Electromechanical components and
mechanical structures for electronic equipment" was submitted to the IEC-CENELEC parallel vote and
approved by CENELEC as EN 60297-3-108:2015.

The following dates are fixed:
(dop) 2014-07-16
• latest date by which the document has
to be implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2017-10-14
standards conflicting with the
document have to be withdrawn
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such patent
rights.
Endorsement notice
The text of the International Standard IEC 60297-3-108:2014 was approved by CENELEC as a European
Standard without any modification.

- 3 - EN 60297-3-108:2015
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
NOTE 1 When an International Publication has been modified by common modifications, indicated by (mod), the relevant EN/HD

applies.
NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available here:
www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60297-3-100 -  Mechanical structures for electronic EN 60297-3-100 -
equipment - Dimensions of mechanical
structures of the 482,6 mm (19 in) series --
Part 3-100: Basic dimensions of front
panels, subracks, chassis, racks and
cabinets
IEC 60297-3-101 -  Mechanical structures for electronic EN 60297-3-101 -
equipment - Dimensions of mechanical
structures of the 482,6 mm (19 in) series --
Part 3-101: Subracks and associated plug-in
units
IEC 60297-3-105 -  Mechanical structures for electronic EN 60297-3-105 -
equipment - Dimensions of mechanical
structures of the 482,6 mm (19 in) series --
Part 3-105: Dimensions and design aspects
for 1U high chassis
IEC 61587-1 -  Mechanical structures for electronic EN 61587-1 -
equipment - Tests for IEC 60917 and IEC
60297 series -- Part 1: Environmental
requirements, test set-up and safety aspects
for cabinets, racks, subracks and chassis
under indoor conditions
IEC 61587-3 -  Mechanical structures for electronic EN 61587-3 -
equipment - Tests for IEC 60917 and IEC
60297 -- Part 3: Electromagnetic shielding
performance tests for cabinets, racks and
subracks
IEC 61587-5 -  Mechanical structures for electronic EN 61587-5 -
equipment - Tests for IEC 60917 and IEC
60297 -- Part 5: Seismic tests for chassis,
subracks, and plug-in units
IEC/TS 62610-2 -  Mechanical structures for electronic - -
equipment - Thermal management for
cabinets in accordance with IEC 60297 and
IEC 60917 series - Part 2: Design guide:
Method for the determination of forced air-
cooling structure
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

IEC 60297-3-108:2014 © IEC 2014 – 3 –
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 collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
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.
International Standard IEC 60297-3-108 has been prepared by subcommittee 48D:
Mechanical structures for electronic equipment, of IEC technical committee 48: Electrical
connectors and mechanical structures for electrical and electronic equipment.
The text of this standard is based on the following documents:
FDIS Report on voting
48D/565/FDIS 48D/570/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.

IEC 60297-3-108:2014 © IEC 2014 – 5 –
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts of IEC 60297 series, under the general title Mechanical structures for
electronic equipment – Dimensions of mechanical structures of the 482,6 mm (19 in) series
can be found on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
IMPORTANT – The 'colour inside' logo on the cover page of this publication 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 60297-3-108:2014 © IEC 2014
INTRODUCTION
The purpose of this standard is to establish alternative dimensions and features for subracks
and associated plug-in units, compared with IEC 60297-3-101. These alternatives allow more
sturdy designs for the load bearing members of the subrack. In addition, the plug-in units are
with alignment pins and fastened with M3 screws. Chassis integrated subracks are also part
of this standard.
The main differing dimensions/features compared with IEC 60297-3-101 are:
a) The subrack height aperture is decreased in order to increase the dimension for the top
and bottom members (most critical load bearing parts).
b) Incorporated alignment between the subrack and the plug-in units. Injecting and extracting
provisions for plug-in units.
c) The mounting flanges of the subracks are recessable. This feature meets the mounting
requirements of heavy subracks and allows the positioning to the centre of gravity.
d) Chassis integrated subracks for optimized thermal management features.
e) Comparison of dimensions and features with IEC 60297-3-101 is shown in appendix D,
Table D.1. For an application image of the subrack based on this standard see Figure 1.

IEC 60297-3-101
Conventional form factor
and normal weight, for small to medium
volume applications, e.g. general industrial
computing and data processing
IEC 60297-3-107 IEC 60297-3-108
Small form factor and light weight, Heavy weight and large form
for large volume applications, e.g. factor, for large volume
embedded systems, applications, e.g. cloud-
mobile/ubiquitous computing computing servers, telecom
systems servers
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