IEC 60917-2-5:2012

Modular order for the development of mechanical structures for electronic equipment practices - Part 2-5: Sectional specification - Interface co-ordination dimensions for the 25 mm equipment practice - Cabinet interface dimensions for miscellaneous equipment

IEC 60917-2-5:2012 applies to a frame-based cabinet structure with the specification of interface dimensions for the installation of miscellaneous equipment. The frame structure provides the mounting planes with mounting points for the assembly of internal and external accessories. Unlike the existing standards IEC 60917-2-1 and IEC 60297-3-100, this standard allows cover parts like top covers and front/rear doors to exceed the cabinet's external coordination dimensions. Keywords: Modular cabinet, cabinet mounting, frame-based

Ordre modulaire pour le développement des structures mécaniques pour les infrastructures électroniques - Partie 2-5: Spécification intermédiaire - Dimensions de coordination pour les interfaces des infrastructures au pas de 25 mm - Dimensions pour les interfaces des baies pour équipements divers

La CEI 60917-2-5:2012 s'applique à une structure de baie utilisant des cadres avec spécification des dimensions pour les interfaces en vue de l'installation des équipements divers. La structure utilisant des cadres fournit des plans de montage avec des points de montage pour l'assemblage des accessoires intérieurs et extérieurs. A la différence des normes existantes CEI 60917-2-1 et CEI 60297-3-100, la présente norme autorise que les parties servant de couvercles comme les couvercles supérieurs et que les portes avant/arrière dépassent les dimensions de coordination extérieures de la baie. Mots clé: cadre modulaire, montage de cadre, structure de baie

General Information

• Status: Published
• Publication Date: 23-Jul-2012
• ICS: 31.240 - Mechanical structures for electronic equipment
• Technical Committee: SC 48D - Mechanical structures for electrical and electronic equipment
• Drafting Committee: WG 2 - TC 48/SC 48D/WG 2
• Current Stage: PPUB - Publication issued
• Start Date: 24-Jul-2012
• Completion Date: 30-Jun-2012

Standards Content (Sample)

IEC 60917-2-5 ®
Edition 1.0 2012-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Modular order for the development of mechanical structures for electronic
equipment practices –
Part 2-5: Sectional specification – Interface co-ordination dimensions for the
25 mm equipment practice – Cabinet interface dimensions for miscellaneous
equipment
Ordre modulaire pour le développement des structures mécaniques pour les
infrastructures électroniques –
Partie 2-5: Spécification intermédiaire – Dimensions de coordination pour les
interfaces des infrastructures au pas de 25 mm – Dimensions pour les
interfaces des baies pour équipements divers

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IEC 60917-2-5 ®
Edition 1.0 2012-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Modular order for the development of mechanical structures for electronic

equipment practices –
Part 2-5: Sectional specification – Interface co-ordination dimensions for the

25 mm equipment practice – Cabinet interface dimensions for miscellaneous

equipment
Ordre modulaire pour le développement des structures mécaniques pour les

infrastructures électroniques –

Partie 2-5: Spécification intermédiaire – Dimensions de coordination pour les

interfaces des infrastructures au pas de 25 mm – Dimensions pour les

interfaces des baies pour équipements divers

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX R
ICS 31.240 ISBN 978-2-83220-152-7

– 2 – 60917-2-5 © IEC:2012
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Arrangement overview of a frame based cabinet structure . 8
5 External coordination dimensions of a cabinet . 9
5.1 General . 9
5.2 Cabinet frame mounting points . 9
6 Modular frame type cabinet structure . 11
6.1 General . 11
6.2 Modular frame type “M” . 11
6.3 Modular frame type “N” . 13
Annex A (informative) Illustrative figures . 15
Bibliography . 19

Figure 1 – Arrangement overview of a frame based cabinet structure . 8
Figure 2 – External coordination dimensions of cabinet . 9
Figure 3 – Frame mounting points of a modular cabinet . 10
Figure 4 – Modular frame type “M“ 600 mm × 600 mm . 12
Figure 5 – Modular frame type “N” 600 mm × 600 mm . 13
Figure A.1 – Illustrative figures for coordination dimensions of cabinet . 15
Figure A.2 – Examples of arrangements of miscellaneous equipment . 16
Figure A.3 – Cabinet mounting uprights mounted on “M” type frame 600 mm × 600 mm . 17
Figure A.4 – Cabinet mounting uprights mounted on “N” type frame 600 mm × 600 mm . 18

Table 1 – External coordination dimensions of cabinet . 14

60917-2-5 © IEC:2012 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MODULAR ORDER FOR THE DEVELOPMENT OF MECHANICAL
STRUCTURES FOR ELECTRONIC EQUIPMENT PRACTICES –

Part 2-5: Sectional specification –
Interface co-ordination dimensions for the 25 mm equipment practice –
Cabinet interface dimensions for miscellaneous equipment

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
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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 60917-2-5 has been prepared by subcommittee 48D: Mechanical
structures for electronic equipment, of IEC technical committee 48: Electromechanical
components and mechanical structures for electronic equipment.
The text of this standard is based on the following documents:
FDIS Report on voting
48D/509/FDIS 48D/516/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.

– 4 – 60917-2-5 © IEC:2012
A list of all the parts in the IEC 60917 series, published under the general title Modular order
for the development of mechanical structures for electronic equipment practices 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.
60917-2-5 © IEC:2012 – 5 –
INTRODUCTION
The standards IEC 60297-3-100 and IEC 60917-2-1 for electronic cabinets have been
established for systematically defined external dimensions and for the internal mounting
dimensions of subracks and chassis considered as the most common mechanical designs of
electronic equipment.
Comparing the above two mentioned standards it becomes obvious that both follow the same
metric footprint but differ with respect to the mounting dimensions for the installed equipment.
Furthermore, there are no definitions in either standards for the interface dimensions of any
other miscellaneous equipment. This kind of equipment is primarily not designed to
standardized mounting dimensions insofar as it is meant for subracks or chassis. The
installation of such non-standard equipment into cabinets used to be accomplished by
supporting shelves or special mounting devices.
In addition to the above mentioned lack of dimensional definitions there are many accessories
for special applications where a definition of interface dimensions could facilitate the
adaptation to a cabinet, e.g. internally or externally mounted cooling device and other
miscellaneous devices.
It seems worthwhile to create a standard for modular cabinets with the definition of interface
mounting planes and mounting points for internally and externally mounted miscellaneous
devices.
Such an attempt could fulfil the dimensional preconditions for an environmentally optimised
modular structure, such as:
– definition of a frame-based cabinet structure for the individual combination of piece parts
e.g. doors, side covers, top covers;
– interfaces for miscellaneous devices by definition of mounting planes with mounting points
on the cabinet frame structure;
– mounting of equipment of the IEC 60297 and IEC 60917 series within the same cabinet
with associated mounting uprights;
– modularity of the frame-based structure supporting shipment in the form of kits in order to
maximize logistics efficiency and to minimize costs.
Legacy cabinets complying with IEC 60917-2-1 and IEC 60297-3-100 may be considered in
conjunction with cabinets of IEC 60917-2-5 without significant technical modifications due to
the fact that all follow the same coordination dimensions. Whilst the internal mounting points
for mounting standardized equipment are defined in IEC 60297-3-100 and IEC 60917-2-1 in
case of IEC 60917-2-5 additional mounting planes and mounting points are defined to be used
for attaching miscellaneous equipment or accessories.

– 6 – 60917-2-5 © IEC:2012
MODULAR ORDER FOR THE DEVELOPMENT OF MECHANICAL
STRUCTURES FOR ELECTRONIC EQUIPMENT PRACTICES –

Part 2-5: Sectional specification –
Interface co-ordination dimensions for the 25 mm equipment practice –
Cabinet interface dimensions for miscellaneous equipment

1 Scope
This part of the IEC 60917 series applies to a frame-based cabinet structure with the
specification of interface dimensions for the installation of miscellaneous equipment. The
frame structure provides the mounting planes with mounting points for the assembly of
internal and external accessories. Unlike the existing standards IEC 60917-2-1 and
IEC 60297-3-100, this standard allows cover parts like top covers and front/rear doors to
exceed the cabinet's external coordination dimensions.
2 Normative references
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.
IEC 60297-3-100, Mechanical structures for electronic 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 60917-1, Modular order for the development of mechanical structures for electronic
equipment practices – Part 1:Generic standard
IEC 60917-2-1, 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-Section 1: Detail specification – Dimensions for cabinets and
racks
60917-2-5 © IEC:2012 – 7 –
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60917-1, as well as
the following apply.
3.1
cabinet mounting uprights
parts of a cabinet providing the mounting points for front panels, chassis and subracks
3.2
cabinet mounting plane and mounting point
surface of the frame structure of a cabinet providing the mounting points for miscellaneous
equipment and for mounting uprights
3.3
frame-based modular cabinet
frame-based modular cabinet structure providing the possibility to combine different cabinet
frame members for a specific cabinet size and for mounting of doors, roofs, side and rear
covers as per the required performance level

– 8 – 60917-2-5 © IEC:2012
4 Arrangement overview of a frame-based cabinet structure
The arrangement of a modular cabinet, as shown in Figure 1, illustrates a frame-based
cabinet structure with the definition of mounting planes and mounting points. These definitions
enable the mounting of miscellaneous equipment with related accessories, mounted on the
cabinet frame members.
Rear door
Side panel
Mounting of miscellaneous
Detail A equipment
Cabinet mounting uprights
In accordance with
IEC 60917-2-1 and
Frame-based
IEC 60297-3-100
cabinet structure
Mounting points
Mounting planes
Detail A
IEC  977/12
Figure 1 – Arrangement overview of a frame-based cabinet structure

60917-2-5 © IEC:2012 – 9 –
5 External coordination dimensions of a cabinet
5.1 General
The external coordination dimensions of a cabinet, as shown in Figure 2 and Table 1 are the
references used to coordinate mechanical interfaces of a range of cabinet sizes. Based on a
600 mm × 600 mm cabinet, the external frame dimensions of cabinets, as shown in Figure 3
define the boundaries which shall be always within the pitch lines of the coordination
dimensions. Doors, roofs, side and rear covers may stay within or exceed the pitch lines by.
25 mm, max as shown in Figure 3. Side covers exceeding the coordination dimensions may
be used on single cabinets or at the end of a row of cabinets. For side by side mounted
cabinets, the side covers mounted between the cabinets shall not exceed the pitch line.

D
H
W
IEC  978/12
Key
H height
W width
D depth
Figure 2 – External coordination dimensions of cabinet
5.2 Cabinet frame mounting points
The cabinet frame mounting points may be on any cross point of the 25 mm grid. The start
points are on the cross points of the pitch lines of the external coordination dimensions as
shown in Figure 3.
The mounting points of a cabinet are, by definition of this standard, on the mounting planes of
the cabinet frame structure. The mounting points identify the location of the mounting holes
for the attachment of internal and external equipment or accessories.
The mounting points in Figure 3 are shown as a top view of a 600 mm wide and 600 mm deep
cabinet frame. The same applies to all members of the cabinet frame. The figures used for the
definition of mounting planes and mounting holes are not intended for purposes of physical
design, but only for locating the mounting points. Depending on the intended application of
the cabinet, the mounting points on the frame design may be selected for placing the
mounting holes as necessary.
– 10 – 60917-2-5 © IEC:2012
Dimensions in millimetres
Top view
Cross section A-A
on the modular frame-based cabinet structure
Mounting points
1)
Rear cover/door 600
25 n × 25
Members of
the cabinet frame
Side cover
≤ 25
598 ± 2,0
Front cover/door
Cross section A-A
Front view F
Front and depth definition
to isometric view
Pitch line
A
A
F
n × 25
IEC  979/12
Key
1) See Table 1
Figure 3 – Frame mounting points of a modular cabinet
1)
598 ± 2,0
Pitch line
n × 25
n × 25
≤ 25
60917-2-5 © IEC:2012 – 11 –
6 Modular frame type cabinet structure
6.1 General
The modular frame type cabinet structure consists of horizontal, vertical and depth members.
These structural parts provide the mounting planes with the mounting points for internal and
external equipment/accessories.
6.2 Modular frame type “M”
The front aperture dimension of 535,00 mm for the frame type “M” is determined for mounting
uprights in accordance with IEC 60917-2-1 or IEC 60297-3-100. Figure 4 illustrates the frame
type “M” with the frame mounting points for internal and external equipment/accessories. The
depth aperture dimension of 485,00 mm follows the same systematic approach as the front
aperture but, for the sake of structural stability of the frame members, the aperture is reduced
by 2 × 25 mm (535,00 – 50,00 = 485,00 mm). The number and position of mounting points
may be chosen from any of the defined positions on the frame. The preferred dimension for
the holes shall be suitable for thread forming screws M6.

– 12 – 60917-2-5 © IEC:2012
Dimensions in millimetres
Top view
Cross section B-B
Example of a 600 mm × 600 mm modular frame type “M”

598,00 ± 2,00
25 n × 25
485,00 ± 1,50
Mounting points for M6
Cross section B-B
Front and depth definition
Front view G
to isometric view
B
B
G
n × 25
IEC  980/12
Figure 4 – Modular frame type “M” 600 mm × 600 mm

598,00 ± 2,0
n × 25
n × 25
535,00 ± 1,50
60917-2-5 © IEC:2012 – 13 –
6.3 Modular frame type “N”
The frame type “N” dimensions are determined for the installation of mounting uprights in
accordance with IEC 60297-3-100. Figure 5 illustrates the modular frame type “N” with the
mounting points for internal and external equipment/accessories. The number and position of
mounting points may be chosen from any of the defined positions on the frame. The preferred
dimension for the holes shall be suitable for thread forming screws M6.
Dimensions in millimetres
Top view
Cross section C-C
Example of a 600 mm × 600 mm modular frame type “N”

598,00 ± 2,00
25 n × 25
2)
513, 00 ± 1,50
Frame mounting points for M6
Front view G
Cross section C-C
Front and depth definition
to isometric view
C
C
G
n × 25
IEC  981/12
Key
2) As an option, for higher frame rigidity, at 600 mm × 600 mm
the dimension 513,00 mm may be reduced to 485,00 mm.
Figure 5 – Modular frame type “N” 600 mm × 600 mm

598,00 ± 2,00
n x 25
2)
n x 25 513,00 ± 1,50
– 14 – 60917-2-5 © IEC:2012
Table 1 – External coordination dimensions of cabinet
All dimensions in mm
Height 800 1 000 1 200 1 400 1 600 1 800 2 000 2 200
H
Width 600 700 750 800 900
W
Depth 300 600 800 900 1 000 1 100 1 200
D
60917-2-5 © IEC:2012 – 15 –
Annex A
(informative)
Illustrative figures
A.1 Illustrative figures for cabinet coordination dimensions
See Figure A.1.
Dimensions in millimetres
Front view
Cabinets with side by side arrangement
W
600 700 750 800 900
Top view
600 W
Possible arrangement back to back

IEC  982/12
Figure A.1 – Illustrative figures for coordination dimensions of cabinet
300 300
D
H
– 16 – 60917-2-5 © IEC:2012
A.2 Examples for the arrangement of miscellaneous equipment
See Figure A.2
Dimensions in millimetres
Top view
Examples of cabinets with subracks/chassis with recessed

mounting flanges of the IEC 60297 or IEC 60917 series

Space for cabling
600 600 750
Side view
Top view
Cabinet with bottom
Cabinet with side
mounted heat exchanger
mounted heat exchanger
Subrack/chassis
mounting area
1 200
IEC  983/12
Figure A.2 – Examples of arrangements of miscellaneous equipment
D
2 200
60917-2-5 © IEC:2012 – 17 –
A.3 Cabinet mounting uprights
A.3.1 General
Cabinet mounting uprights are used for the installation of front panels, subracks or chassis.
Mounting uprights may be used as a physically separate or an integrated feature of the
cabinet frame members. Cabinet uprights may be used in the front position or recessed in
order to increase the cabling space in front of the mounting flanges of a subrack/chassis or
for better positioning of heavy equipment with respect to the centre of gravity.
A.3.2 Cabinet mounting uprights mounted on “M” type frame members
Figure A.3 illustrates the cabinet mounting uprights mounted on the “M” type frame members
in accordance with IEC 60917-2-1 and uprights for IEC 60297-3-100 as an alternative. The
same applies to cabinets with subracks/chassi
...