IEC 60072-1:2022

Rotating electrical machines - Dimensions and output series - Part 1: Frame numbers 56 to 400 and flange numbers 55 to 1080

IEC 60072-1:2022 is applicable for the majority of rotating electrical machines for industrial purposes within the dimension range and output powers.
- Foot- mounted: shaft heights: 56 mm to 400 mm
- Flange- mounted: pitch circle diameter of flange: 55 mm to 1 080 mm.
This seventh edition cancels and replaces the sixth edition published in 1991. This edition includes the following significant technical changes with respect to the previous edition:
a. modification of the series title;
b. complete revision on the basis of EN 50347;
c. integration of the relationships between frame size, shaft extensions, rated outputs and flange numbers;
d. additional tolerances and measurements for shafts;
e. modification of Annex A with additional frame numbers and relationships between frame size and rated power.

Machines électriques tournantes - Dimensions et séries de puissances - Partie 1: Désignation des carcasses entre 56 et 400 et des brides entre 55 et 1080

IEC 60072-1:2022 s'applique à la majorité des machines électriques tournantes pour usages industriels qui relèvent de la plage de dimensions et des puissances concernées:
- Fixation par pattes: hauteur d'axe; entre 56 mm et 400 mm.
- Fixation par bride: diamètre du cercle primitif de la bride: entre 55 mm et 1 080 mm.
Cette septième édition annule et remplace la sixième édition parue en 1991. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
a. modification du titre de la série;
b. révision complète par rapport à l'EN 50347;
c. ajout de l'article Correspondance entre les dimensions de carcasses, les bouts d'arbre, les puissances assignées et les désignations de brides;
d. ajout de tolérances et de mesurages pour les arbres;
e. modification de l'Annexe A, notamment ajout de désignations de carcasses supplémentaires et de la correspondance entre les dimensions de carcasses et la puissance assignée.

General Information

• Status: Published
• Publication Date: 29-Mar-2022
• ICS: 29.160.01 - Rotating machinery in general
• Technical Committee: TC 2 - Rotating machinery
• Drafting Committee: WG 12 - TC 2/WG 12
• Current Stage: PPUB - Publication issued
• Start Date: 25-Apr-2022
• Completion Date: 30-Mar-2022

Standards Content (Sample)

IEC 60072-1 ®
Edition 7.0 2022-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Rotating electrical machines – Dimensions and output series –
Part 1: Frame numbers 56 to 400 and flange numbers 55 to 1080

Machines électriques tournantes –Dimensions et séries de puissances –
Partie 1: Désignation des carcasses entre 56 et 400 et des brides
entre 55 et 1080
All rights reserved. Unless otherwise specified, 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
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.

Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite
ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie
et les microfilms, sans l'accord écrit de l'IEC ou du Comité national de l'IEC du pays du demandeur. Si vous avez des
questions sur le copyright de l'IEC ou si vous désirez obtenir des droits supplémentaires sur cette publication, utilisez
les coordonnées ci-après ou contactez le Comité national de l'IEC de votre pays de résidence.

IEC Secretariat Tel.: [phone]
3, rue de Varembé [e-mail]
CH-1211 Geneva 20 www.iec.ch
Switzerland
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.

IEC publications search - webstore.iec.ch/advsearchform IEC Products & Services Portal - products.iec.ch
The advanced search enables to find IEC publications by a Discover our powerful search engine and read freely all the
variety of criteria (reference number, text, technical publications previews. With a subscription you will always
committee, …). It also gives information on projects, replaced have access to up to date content tailored to your needs.
and withdrawn publications.
Electropedia - www.electropedia.org
IEC Just Published - webstore.iec.ch/justpublished
The world's leading online dictionary on electrotechnology,
Stay up to date on all new IEC publications. Just Published
containing more than 22 300 terminological entries in English
details all new publications released. Available online and
and French, with equivalent terms in 19 additional languages.
once a month by email.
Also known as the International Electrotechnical Vocabulary

(IEV) online.
IEC Customer Service Centre - webstore.iec.ch/csc
If you wish to give us your feedback on this publication or
need further assistance, please contact the Customer Service
Centre: [e-mail].
A propos de l'IEC
La Commission Electrotechnique Internationale (IEC) est la première organisation mondiale qui élabore et publie des
Normes internationales pour tout ce qui a trait à l'électricité, à l'électronique et aux technologies apparentées.

A propos des publications IEC
Le contenu technique des publications IEC est constamment revu. Veuillez vous assurer que vous possédez l’édition la
plus récente, un corrigendum ou amendement peut avoir été publié.

Recherche de publications IEC - IEC Products & Services Portal - products.iec.ch
webstore.iec.ch/advsearchform Découvrez notre puissant moteur de recherche et consultez
La recherche avancée permet de trouver des publications IEC gratuitement tous les aperçus des publications. Avec un
en utilisant différents critères (numéro de référence, texte, abonnement, vous aurez toujours accès à un contenu à jour
comité d’études, …). Elle donne aussi des informations sur adapté à vos besoins.
les projets et les publications remplacées ou retirées.

Electropedia - www.electropedia.org
IEC Just Published - webstore.iec.ch/justpublished
Le premier dictionnaire d'électrotechnologie en ligne au
Restez informé sur les nouvelles publications IEC. Just
monde, avec plus de 22 300 articles terminologiques en
Published détaille les nouvelles publications parues.
anglais et en français, ainsi que les termes équivalents dans
Disponible en ligne et une fois par mois par email.
19 langues additionnelles. Egalement appelé Vocabulaire

Electrotechnique International (IEV) en ligne.
Service Clients - webstore.iec.ch/csc

Si vous désirez nous donner des commentaires sur cette
publication ou si vous avez des questions contactez-nous:
[e-mail].
IEC 60072-1 ®
Edition 7.0 2022-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Rotating electrical machines – Dimensions and output series –

Part 1: Frame numbers 56 to 400 and flange numbers 55 to 1080

Machines électriques tournantes –Dimensions et séries de puissances –

Partie 1: Désignation des carcasses entre 56 et 400 et des brides

entre 55 et 1080
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.160.01 ISBN 978-2-8322-1093-0

– 2 – IEC 60072-1:2022 © IEC 2022
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Symbols . 7
4.1 Letter symbols for dimensions . 7
4.2 Dimensional sketches . 9
5 Designations of machines . 10
5.1 Frame sizes . 10
5.2 Flange numbers . 10
5.3 Shaft extension . 10
6 Location of the terminal box . 10
6.1 Machines with feet . 10
6.2 Machines without feet . 10
7 Fixing dimensions and tolerances . 11
7.1 General . 11
7.2 Foot-mounted machines . 11
7.3 Flange-mounted machines . 12
8 Shaft end dimensions and tolerances . 13
8.1 Shaft end dimenions . 13
8.2 Parallelism of shaft to foot face . 16
8.3 Parallelism of keyway to shaft axis . 16
8.4 Lateral displacement of keyway . 16
9 Methods of measurement . 16
9.1 General . 16
9.2 Shaft extensions run-out . 17
9.3 Concentricity of spigot and shaft . 17
9.4 Perpendicularity of mounting face of flange to shaft . 17
9.5 Parallelism of shaft to foot face . 18
9.6 Parallelism of keyway to shaft axis . 19
9.7 Lateral displacement of keyway . 19
10 Preferred rated output values . 19
11 Relationships between frame size, shaft extensions, rated outputs and flange
numbers . 21
Annex A (informative) Additional relationships for frame sizes and output ratings . 24
Annex B (informative) Additional recommended letters and dimensions . 25
Bibliography . 26

Figure 1 – Dimensional sketches . 9
Figure 2 – Illustration of the measurement of shaft extensions run-out . 17
Figure 3 – Illustration of the measurement of concentricity . 17
Figure 4 – Illustration of the measurement of perpendicularity . 18
Figure 5 – Illustration of the measurement of parallelism . 18
Figure 6 – Illustration of parallelism of keyway . 19
Figure 7 – Illustration of lateral displacement of keyway . 19

Table 1 – Dimensions for machines with shaft height from 56 mm to 400 mm . 11
Table 2 – Dimensions and tolerances for flanges with pitch circle diameters from 55
mm to 1 080 mm . 12
Table 3 – Dimensions and tolerances for shaft ends . 14
Table 4 – Tolerance for parallelism shaft to foot face . 16
Table 5 – Tolerance for parallelism of keyway to shaft axis . 16
Table 6 – Preferred rated output values . 20
Table 7 – Totally enclosed fan-cooled induction motors (IC41) with squirrel-cage rotor . 21
Table 8 – Totally enclosed fan cooled induction motors (IC41) with slip ring rotor . 22
Table 9 – Ventilated induction motors (IC01) with squirrel-cage rotor . 23
Table 10 – Ventilated induction motors (IC01) with slip ring rotor . 23
Table A.1 – Relationships between frame size and rated output for 50 Hz increased
safety "eb" . 24
Table B.1 – Additional frame letters and B dimensions in mm . 25

– 4 – IEC 60072-1:2022 © IEC 2022
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ROTATING ELECTRICAL MACHINES –
DIMENSIONS AND OUTPUT SERIES –

Part 1: Frame numbers 56 to 400 and flange
numbers 55 to 1080
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.
...