Dimensions of low-voltage switchgear and controlgear - Standardized mounting on rails for mechanical support of switchgear, controlgear and accessories (IEC 60715:2017)

This document specifies dimensional and functional requirements for the compatible mounting
of switchgear, controlgear and accessories on some types of rails.
The object of this document is to specify those dimensions that are critical for the correct
design of mounting rails and equipment.
The following sections are covered by this document:
– "top hat" section;
– "C" section;
– "G" section.
NOTE 1 Mounting compatibility does not imply functional interchangeability.
Annexes deal with specific steel mounting rails satisfying the requirements of this document,
and give additional dimensional data and loading requirements applicable to such rails.
NOTE 2 The detailed design and material of specific steel rails is given in the annexes.
NOTE 3 Other shapes of rails complying with this document not listed in Annex A can be used.
Mounting rails used as a protective conductor using a conducting connection to a protective
conductor terminal block are specified in IEC 60947-7-2. In other applications where the
mounting rail is used as earthing conductor, the relevant product standard applies.
This document has the status of a horizontal standard in accordance with
IEC Guide 108:2006.
This horizontal standard is primarily intended for use by technical committees in the
preparation of standards in accordance with the principles laid down in IEC Guide 108.
One of the responsibilities of a technical committee is, wherever applicable, to make use of
horizontal standards in the preparation of its publications. The contents of this horizontal
standard will not apply unless specifically referred to or included in the relevant publications.
2 Normative

Abmessungen von Niederspannungsschaltgeräten - Genormte Tragschienen für die mechanische Befestigung von elektrischen Geräten in Schaltanlagen

Dimensions de l'appareillage à basse tension - Montage normalisé sur profilés-supports pour le support mécanique des appareillages et de leurs accessoires

IEC 60715:2017 spécifie les exigences dimensionnelles et fonctionnelles destinées à assurer la compatibilité du montage des appareillages et de leurs accessoires sur certains types de profilés-supports. Cette deuxième édition annule et remplace la première édition parue en 1981 et l'Amendement 1:1995. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente: a) la fonction électrique de conducteur de protection du profilé-support est couverte par la norme de produit correspondante. b) Le document a fait l’objet d’une mise à jour éditoriale visant à le rendre conforme aux Directives ISO/IEC, Partie 2:2016 et les dessins ont fait l’objet d’une mise à jour afin d’être conformes aux normes ISO de tolérancement et de dessin.Elle a le statut d'une norme horizontale conformément au Guide 108 de l'IEC.

Dimenzije nizkonapetostnih stikalnih in krmilnih naprav - Standardizirana vgradnja stikalnih naprav, krmilnih naprav in dodatne opreme na nosilne natične letve za mehansko podporo (IEC 60715:2017)

Ta dokument določa dimenzijske in funkcionalne zahteve za združljivo vgradnjo stikalnih naprav, krmilnih naprav in dodatne opreme na nekatere vrste nosilnih natičnih letev.
Namen tega dokumenta je določiti dimenzije, ki so ključnega pomena za pravilno načrtovanje nosilnih natičnih letev in opreme.
Ta dokument vsebuje poglavja z naslednjimi prerezi:
– poglavje s prerezom »pokrivne letve«;
– poglavje s prerezom »C«;
– poglavje s prerezom »G«.
OPOMBA 1: Združljivost pri vgradnji ne pomeni funkcijske zamenljivosti.
V dodatkih so opisane posebne jeklene nosilne natične letve, ki ustrezajo zahtevam v tem dokumentu, in dodatni podatki o dimenzijah in obremenitvah, ki veljajo za take letve.
OPOMBA 2: Podrobna zasnova in material določenih jeklenih letev sta podana v dodatkih.
OPOMBA 3: Uporabijo se lahko druge oblike letev, ki so v skladu s tem dokumentom, toda niso naštete v dodatku A.
Nosilne natične letve, ki se uporabljajo kot zaščitni vodnik, ki uporabljajo prevodni priključek za priključitev na priključni blok zaščitnega vodnika, so podane v standardu IEC 60947-7-2. Za druge aplikacije, pri katerih je nosilna natična letev uporabljena kot ozemljitveni vodnik, se uporablja ustrezni standard za izdelek.
Ta dokument ima status usklajenega horizontalnega standarda v skladu z vodilom IEC 108:2006. Ta horizontalni standard je namenjen predvsem tehničnim odborom za pripravo standardov v skladu z načeli vodila IEC 108. Ena od pristojnosti tehničnih odborov je, da med pripravo publikacij uporabljajo horizontalne standarde, kadar je to primerno. Vsebina tega horizontalnega standarda se ne uporablja, razen če je izrecno navedena ali zajeta v ustreznih publikacijah.

General Information

Status
Published
Publication Date
10-Dec-2017
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
30-Nov-2017
Due Date
04-Feb-2018
Completion Date
11-Dec-2017

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SLOVENSKI STANDARD
SIST EN 60715:2018
01-januar-2018
1DGRPHãþD
SIST EN 60715:2002

'LPHQ]LMHQL]NRQDSHWRVWQLKVWLNDOQLKLQNUPLOQLKQDSUDY6WDQGDUGL]LUDQDYJUDGQMD

VWLNDOQLKQDSUDYNUPLOQLKQDSUDYLQGRGDWQHRSUHPHQDQRVLOQHQDWLþQHOHWYH]D
PHKDQVNRSRGSRUR ,(&

Dimensions of low-voltage switchgear and controlgear - Standardized mounting on rails

for mechanical support of switchgear, controlgear and accessories (IEC 60715:2017)

Ta slovenski standard je istoveten z: EN 60715:2017
ICS:
29.130.20 Nizkonapetostne stikalne in Low voltage switchgear and
krmilne naprave controlgear
SIST EN 60715:2018 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN 60715:2018
---------------------- Page: 2 ----------------------
SIST EN 60715:2018
EUROPEAN STANDARD EN 60715
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2017
ICS 29.130.20 Supersedes EN 60715:2001
English Version
Dimensions of low-voltage switchgear and controlgear -
Standardized mounting on rails for mechanical support of
switchgear, controlgear and accessories
(IEC 60715:2017)

Dimensions de l'appareillage à basse tension - Montage Abmessungen von Niederspannungsschaltgeräten -

normalisé sur profilés-supports pour le support mécanique Genormte Tragschienen für die mechanische Befestigung

des appareillages et de leurs accessoires von elektrischen Geräten in Schaltanlagen

(IEC 60715:2017) (IEC 60715:2017)

This European Standard was approved by CENELEC on 2017-09-01. 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, Serbia, 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

© 2017 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. EN 60715:2017 E
---------------------- Page: 3 ----------------------
SIST EN 60715:2018
EN 60715:2017
European foreword

The text of document 121A/153/FDIS, future edition 2 of IEC 60715, prepared by SC 121A

"Low-voltage switchgear and controlgear" of IEC/TC 121 "Switchgear and controlgear and their

assemblies for low voltage" was submitted to the IEC-CENELEC parallel vote and approved by

CENELEC as EN 60715:2017.
The following dates are fixed:
(dop) 2018-06-01
• latest date by which the document has to be implemented at
national level by publication of an identical national
standard or by endorsement
(dow) 2020-09-01
• latest date by which the national standards conflicting with
the document have to be withdrawn
This document supersedes EN 60715:2001.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.

Endorsement notice

The text of the International Standard IEC 60715:2017 was approved by CENELEC as a European

Standard without any modification.
---------------------- Page: 4 ----------------------
SIST EN 60715:2018
EN 60715:2017
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. 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 60947-7-2 - Low-voltage switchgear and controlgear - EN 60947-7-2 2009
Part 7-2: Ancillary equipment - Protective
conductor terminal blocks for copper
conductors
---------------------- Page: 5 ----------------------
SIST EN 60715:2018
EN 60715:2017
Annex ZZ
(informative)
Relationship between this European standard and the safety objectives of
Directive 2014/35/EU [2014 OJ L96] aimed to be covered

This European standard has been prepared under a Commission’s standardisation request relating to

harmonised standards in the field of the Low Voltage Directive, M/511, to provide one voluntary means

of conforming to safety objectives of Directive 2014/35/EU of the European Parliament and of the

Council of 26 February 2014 on the harmonisation of the laws of the Member States relating to the

making available on the market of electrical equipment designed for use within certain voltage limits

[2014 OJ L96].

Once this standard is cited in the Official Journal of the European Union under that Directive,

compliance with the normative clauses of this standard given in Table ZZ.1 confers, within the limits of

the scope of this standard, a presumption of conformity with the corresponding safety objectives of

that Directive, and associated EFTA regulations.

Table ZZ.1 – Correspondence between this European standard and Annex I of Directive

2014/35/EU [2014 OJ L96]
Safety objectives of Directive Clause(s) / sub-clause(s) of this Remarks/note
2014/35/EU EN
1 a) 2, 3, 5, Annex A
1 b) 5, Annex B
1 c) Refer to 2 a) to 2 d) and 3 a) to 3
c) of this table
2 a) - Not applicable
2 b) - Not applicable
2 c) 4, 5, Annex A, Annex B
2 d) - Not applicable
3 a) 4, 5, Annex A, Annex B
3 b) Annex B
3 c) Annex B

WARNING 1: Presumption of conformity stays valid only as long as a reference to this European

standard is maintained in the list published in the Official Journal of the European Union. Users of this

standard should consult frequently the latest list published in the Official Journal of the European

Union.

WARNING 2: Other Union legislation may be applicable to the product(s) falling within the scope of

this standard.
---------------------- Page: 6 ----------------------
SIST EN 60715:2018
IEC 60715
Edition 2.0 2017-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
HORIZONTAL STANDARD
NORME HORIZONTALE
Dimensions of low-voltage switchgear and controlgear – Standardized mounting
on rails for mechanical support of switchgear, controlgear and accessories
Dimensions de l'appareillage à basse tension – Montage normalisé sur profilés-
supports pour le support mécanique des appareillages et de leurs accessoires
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.130.20 ISBN 978-2-8322-4646-7

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 7 ----------------------
SIST EN 60715:2018
– 2 – IEC 60715:2017 © IEC 2017
CONTENTS

FOREWORD ........................................................................................................................... 4

INTRODUCTION ..................................................................................................................... 6

1 Scope .............................................................................................................................. 7

2 Normative references ...................................................................................................... 7

3 Terms and definitions ...................................................................................................... 8

4 Functional requirements .................................................................................................. 8

5 Standard dimensions ....................................................................................................... 8

5.1 General ................................................................................................................... 8

5.2 Top hat section ....................................................................................................... 9

5.3 "C" section ............................................................................................................ 10

5.4 "G" section ............................................................................................................ 13

Annex A (normative) Specific steel mounting rails ............................................................... 14

A.1 General ................................................................................................................. 14

A.2 Top hat section rail TH 15-5,5 .............................................................................. 14

A.2.1 Dimensions .................................................................................................... 14

A.2.2 Tolerances .................................................................................................... 15

A.3 Top hat section rail TH 35-7,5 and TH 35-15 ......................................................... 15

A.3.1 Dimensions .................................................................................................... 15

A.3.2 Tolerances .................................................................................................... 16

A.4 Top hat section rail TH 75-25 ............................................................................... 16

A.4.1 Dimensions .................................................................................................... 16

A.4.2 Tolerances .................................................................................................... 17

A.5 "C" section rails: C 20, C 30, C 40 and C 50 ......................................................... 17

A.5.1 Dimensions .................................................................................................... 17

A.5.2 Tolerance ...................................................................................................... 18

A.6 "G" section rail: G 32 ............................................................................................ 18

A.6.1 Dimensions .................................................................................................... 18

A.6.2 Tolerances .................................................................................................... 19

Annex B (informative) Application guide ............................................................................... 20

B.1 General ................................................................................................................. 20

B.2 Guidance for use of top hat rails ........................................................................... 20

B.2.1 For steel rails in Annex A ............................................................................... 20

B.2.2 For rails other than steel rails ........................................................................ 23

B.3 Guidance for use of "C" section rails ..................................................................... 23

B.3.1 General ......................................................................................................... 23

B.3.2 For steel rails to Annex A .............................................................................. 23

B.3.3 For rails other than steel rails ........................................................................ 27

Bibliography .......................................................................................................................... 28

Figure 1 – Mounting rail TH 15 ................................................................................................ 9

Figure 2 – Mounting rail TH 35 ................................................................................................ 9

Figure 3 – Mounting rail TH 75 .............................................................................................. 10

Figure 4 – Mounting rail C 20 ................................................................................................ 10

Figure 5 – Mounting rail C 30 ................................................................................................ 11

Figure 6 – Mounting rail C 40 ................................................................................................ 11

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SIST EN 60715:2018
IEC 60715:2017 © IEC 2017 – 3 –

Figure 7 – Mounting rail C 50 ................................................................................................ 12

Figure 8 – Mounting rail G 32 ................................................................................................ 13

Figure A.1 – Top hat rails 15 mm wide for snap-on mounting of equipment .......................... 15

Figure A.2 – Tolerances (TH 15-5,5) ..................................................................................... 15

Figure A.3 – Top hat rails 35 mm wide for snap-on mounting of equipment .......................... 16

Figure A.4 – Tolerances (TH 35-7,5 and TH 35-15) ............................................................... 16

Figure A.5 – Top hat rail 75 mm wide for snap-on mounting of equipment ............................ 17

Figure A.6 – Tolerances (TH 75-25) ...................................................................................... 17

Figure A.7 – "C" section rails ................................................................................................ 18

Figure A.8 – Tolerances (C 20, C 30, C 40 and C 50) ........................................................... 18

Figure A.9 – Dimensions of "G" section rails ......................................................................... 19

Figure A.10 – Tolerances (G 32) ........................................................................................... 19

Figure B.1 – Assessment of rail deflection ............................................................................ 21

Figure B.2 – Permissible load capacity ............................................................... 22

M = f(L,h)

Figure B.3 – Permissible load capacity M = f(L,h) ............................................................... 23

Figure B.4 – Assessment of rail deflection ............................................................................ 24

Figure B.5 – Permissible load capacity M = f(L) .................................................................. 25

Figure B.6 – Assembly of two identical "C" section rails Assessment of the deflection .......... 26

Figure B.7 – Assembly of two identical "C" section rails Permissible stress M = f(L)

for H = 100 mm ..................................................................................................................... 27

Table A.1 – Dimensions of “C” section rails ........................................................................... 18

Table B.1 – Maximum torque M ...................................................................................... 24

max
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SIST EN 60715:2018
– 4 – IEC 60715:2017 © IEC 2017
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
DIMENSIONS OF LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR –
STANDARDIZED MOUNTING ON RAILS FOR MECHANICAL SUPPORT
OF SWITCHGEAR, CONTROLGEAR AND ACCESSORIES
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 60715 has been prepared by subcommittee 121A: Low-voltage

switchgear and controlgear, of IEC technical committee 121: Switchgear and controlgear and

their assemblies for low voltage.
This second edition cancels and replaces the first edition published in 1981 and
Amendment 1:1995. This edition constitutes a technical revision.

This edition includes the following significant technical changes with respect to the previous

edition:

a) the electrical function of the rail for protective earthing is covered by the relevant product

standard.

b) The document has been editorially updated to bring it into compliance with the ISO/IEC

Directives, Part 2:2016, and drawings have been updated to bring them in compliance with

ISO tolerancing and drawing standards.
---------------------- Page: 10 ----------------------
SIST EN 60715:2018
IEC 60715:2017 © IEC 2017 – 5 –
It has the status of a horizontal standard in accordance with IEC Guide 108.
The text of this International Standard is based on the following documents:
FDIS Report on voting
121A/153/FDIS 121A/163/RVD

Full information on the voting for the approval of this International Standard can be found in

the report on voting indicated in the above table.

This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

The committee has decided that the contents of this document will remain unchanged until the

stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to

the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
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SIST EN 60715:2018
– 6 – IEC 60715:2017 © IEC 2017
INTRODUCTION

This document is provided as a horizontal standard. It is necessary to define standardized

mounting on rails for mechanical support of low-voltage switchgear and controlgear, electrical

accessories, and similar devices.
The user wants them to be easy to fix, remove and rearrange.
Two methods are used for fixing a device on a rail:

– either directly by clipping on the rail (this method is particularly suitable for "top hat" rails

or "G" rails);

– or by means of a variety of accessories such as sliding nuts and hooked or T-headed bolts

(this method is particularly suitable for "C" rails).

In the case of "G" rails, the first of these methods has been mainly used for mounting terminal

blocks which snap in and out of position and are clamped in rows by adjustable end stops.

The rail can take the form of a standard section as an integral part of the enclosure.

Rails are also available of composite sections that combine, for example, "top hat" and "C"

section sizes thus accepting devices with various arrangements for mounting.
One or more rails can be used as necessary for fixing devices.

Since rail mounting can affect the performance of equipment, it can be advisable for

equipment manufacturers to give guidance in their literature on the suitability for this form of

mounting.
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SIST EN 60715:2018
IEC 60715:2017 © IEC 2017 – 7 –
DIMENSIONS OF LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR –
STANDARDIZED MOUNTING ON RAILS FOR MECHANICAL SUPPORT
OF SWITCHGEAR, CONTROLGEAR AND ACCESSORIES
1 Scope

This document specifies dimensional and functional requirements for the compatible mounting

of switchgear, controlgear and accessories on some types of rails.

The object of this document is to specify those dimensions that are critical for the correct

design of mounting rails and equipment.
The following sections are covered by this document:
– "top hat" section;
– "C" section;
– "G" section.
NOTE 1 Mounting compatibility does not imply functional interchangeability.

Annexes deal with specific steel mounting rails satisfying the requirements of this document,

and give additional dimensional data and loading requirements applicable to such rails.

NOTE 2 The detailed design and material of specific steel rails is given in the annexes.

NOTE 3 Other shapes of rails complying with this document not listed in Annex A can be used.

Mounting rails used as a protective conductor using a conducting connection to a protective

conductor terminal block are specified in IEC 60947-7-2. In other applications where the

mounting rail is used as earthing conductor, the relevant product standard applies.

This document has the status of a horizontal standard in accordance with
IEC Guide 108:2006.

This horizontal standard is primarily intended for use by technical committees in the

preparation of standards in accordance with the principles laid down in IEC Guide 108.

One of the responsibilities of a technical committee is, wherever applicable, to make use of

horizontal standards in the preparation of its publications. The contents of this horizontal

standard will not apply unless specifically referred to or included in the relevant publications.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their

content constitutes requirements of this document. For dated references, only the edition

cited applies. For undated references, the latest edition of the referenced document (including

any amendments) applies.

IEC 60947-7-2, Low-voltage switchgear and controlgear – Part 7-2: Ancillary equipment –

Protective conductor terminal blocks for copper conductors
---------------------- Page: 13 ----------------------
SIST EN 60715:2018
– 8 – IEC 60715:2017 © IEC 2017
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following

addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
mounting rail

standardized profile of any material used for supporting switchgear, controlgear and

accessories
3.2
reference plane (for measurement)
plane touching the front of the rail
4 Functional requirements

The basic functional requirement of mounting rails is that they shall adequately support

mechanically the electrical equipment.

The rail itself, in combination with the distance between the points of support and the nature

of these supports, shall be of sufficient mechanical strength and stiffness to ensure the

static and dynamic load of the equipment.

Because of the great variety of equipment, and of combinations of equipment, and the spatial

distribution of such equipment, it is not possible to state specific requirements that ensure

proper performance under all conditions; however the detailed dimensions and the strength

requirements given in Annex A and Annex B have been shown by experience to be suitable

for use with a variety of equipment e.g. contactors, fuses, switches, terminal blocks,

accessories and circuit-breakers.

The responsibility for the correct construction and choice of materials lies with the

manufacturer of the complete assembly. Rail mounting affects the performance of equipment,

and it is advisable for product technical committees to give guidance in their publications on

the suitability for mounting on rail.
5 Standard dimensions
5.1 General

Unless otherwise mentioned, dimensions are given in millimetres. Only dimensions and

angles which are critical for the correct design of the rail are specified in Figures 1 to 8.

The indication "burr-free edge" may be made subject to agreement between manufacturer

and user so as to ensure proper fitting in practical cases.
---------------------- Page: 14 ----------------------
SIST EN 60715:2018
IEC 60715:2017 © IEC 2017 – 9 –
5.2 Top hat section
Reference plane
Reference plane
5,1
1,1
1 ±0,1
10°
R0,4 ±0,1
burr free edges
≤3°
≤10°
IEC
IEC
a) Lateral view b) Detail A
Figure 1 – Mounting rail TH 15
Reference plane
7,1
Reference plane
1,04
1 ±0,04
18°
≤R0,2
burr free
edges
≤3°
≤18°
IEC IEC
a) Lateral view b) Detail A
Figure 2 – Mounting rail TH 35
3,45
1,8
35,3
15,2
15 ±0,2
35 ±0,3
---------------------- Page: 15 ----------------------
SIST EN 60715:2018
– 10 – IEC 60715:2017 © IEC 2017
Reference plane
Reference plane
24,6
3 ±0,08
3,08
≤R0,3
burr free edges
≤1°
≤6°
IEC IEC
a) Lateral view b) Detail A
Figure 3 – Mounting rail TH 75

In Figures 1 a), 2 a) and 3 a), the cross-hatched area shows the maximum space available for

the rail, its supporting structure and fixing means. The remaining space is the maximum

space which can be counted on as available for the equipment to be mounted on the rail.

Figures 1 b), 2 b) and 3 b) show magnified details of the edge of the rail, including the

manufacturing tolerances. The rails are symmetrical within the given tolerances. The angular

tolerances indicated are one-sided and shall remain between zero and the values indicated.

They include design tolerances.
5.3 "C" section
Reference plane Reference plane
8,15
1,1
1 ±0,1
≤3°
IEC
IEC
a) Lateral view b) Detail A
Figure 4 – Mounting rail C 20
0,6 × 45°
9,7
11,5
17,05
75,5
75 ±0,5
11 ±0,3
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SIST EN 60715:2018
IEC 60715:2017 © IEC 2017 – 11 –
Reference plane
Reference plane
12,65
1,6
1,5 ±0,1
≤3°
IEC
IEC
a) Lateral view b) Detail A
Figure 5 – Mounting rail C 30
Reference plane Reference plane
19,65
6,7
5,5 ±1,2
2,1
≤0,5
IEC
IEC
a) Lateral view b
...

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