SIST EN IEC 60034-7:2022
(Main)Rotating electrical machines - Part 7: Classification of types of construction, mounting arrangements and terminal box position (IM Code) (IEC 60034-7:2020)
Rotating electrical machines - Part 7: Classification of types of construction, mounting arrangements and terminal box position (IM Code) (IEC 60034-7:2020)
This part of IEC 60034 specifies the IM Code, a classification of types of construction, mounting
arrangements and the terminal box position of rotating electrical machines.
Two systems of classification are provided as follows:
– Code I (see Clause 4): An alpha-numeric designation applicable to machines with endshield bearing(s) and only one shaft extension.
– Code II (see Clause 5): An all-numeric designation applicable to a wider range of types
of machines including types covered by Code I.
The type of machine not covered by Code II is fully described in words.
The relationship between Code I and Code II is given in Annex A.
Drehende elektrische Maschinen - Teil 7: Klassifizierung der Bauarten, der Aufstellungsarten und der Klemmkasten-Lage (IM-Code) (IEC 60034-7:2020)
Machines électriques tournantes - Partie 7: Classification des modes de construction, des dispositions de montage et position de la boîte à bornes (Code IM) (IEC 60034-7:2020)
l’IEC 60034-7:2020 spécifie le Code IM, une classification des modes de construction, des dispositions de montage et position de la boîte à bornes des machines électriques tournantes. Deux systèmes de classification sont prévus comme suit:
- Code I: Désignation alphanumérique applicable aux machines à flasque(s) palier(s) et à un seul bout d'arbre
- Code II: Désignation numérique applicable à une plus large plage de types de machines, y compris les types couverts par le Code I
Cette troisième édition annule et remplace la deuxième édition, parue en 1992, ainsi que son Amendement 1:2000. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
- ajout de la note relative aux moteurs doubles
- référence à 4.3 remplaçant la répétition du texte
- nouveau paragraphe relatif au marquage de l’inclinaison ou de la déclinaison de l’arbre
Električni rotacijski stroji - 7. del: Razvrstitev vrst konstrukcije, montaže in položaja priključne omarice (koda IM) (IEC 60034-7:2020)
Ta del standarda IEC 60034 določa kodo IM, razvrstitev konstrukcijskih tipov, montažne postavitve in položaj priključne omarice za električne rotacijske stroje.
Navedena sta naslednja sistema razvrščanja:
– Koda I (glej točko 4): Črkovno-številska oznaka, ki se uporablja za stroje z zaščitenimi ležaji in s samo enim podaljškom gredi.
– Koda II (glej točko 5): Številska oznaka, ki se uporablja za širši razpon tipov strojev, vključno s tistimi, ki jih zajema koda I.
Tip stoja, ki ga koda II ne zajema, je v celoti opisan z besedami.
Razmerje med kodo I in kodo II je navedeno v dodatku A.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN IEC 60034-7:2022
01-julij-2022
Nadomešča:
SIST EN 60034-7:1999
SIST EN 60034-7:1999/A1:2002
Električni rotacijski stroji - 7. del: Razvrstitev vrst konstrukcije, montaže in
položaja priključne omarice (koda IM) (IEC 60034-7:2020)
Rotating electrical machines - Part 7: Classification of types of construction, mounting
arrangements and terminal box position (IM Code) (IEC 60034-7:2020)
Drehende elektrische Maschinen - Teil 7: Klassifizierung der Bauarten, der
Aufstellungsarten und der Klemmkasten-Lage (IM-Code) (IEC 60034-7:2020)
Machines électriques tournantes - Partie 7: Classification des modes de construction,
des dispositions de montage et position de la boîte à bornes (Code IM) (IEC 60034-
7:2020)
Ta slovenski standard je istoveten z: EN IEC 60034-7:2022
ICS:
29.160.01 Rotacijski stroji na splošno Rotating machinery in
general
SIST EN IEC 60034-7:2022 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN IEC 60034-7:2022
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SIST EN IEC 60034-7:2022
EUROPEAN STANDARD EN IEC 60034-7
NORME EUROPÉENNE
EUROPÄISCHE NORM March 2022
ICS 29.160.01 Supersedes EN 60034-7:1993 and all of its amendments
and corrigenda (if any)
English Version
Rotating electrical machines - Part 7: Classification of types of
construction, mounting arrangements and terminal box position
(IM Code)
(IEC 60034-7:2020)
Machines électriques tournantes - Partie 7: Classification Drehende elektrische Maschinen - Teil 7: Klassifizierung
des modes de construction, des dispositions de montage et der Bauarten, der Aufstellungsarten und der Klemmkasten-
position de la boîte à bornes (Code IM) Lage (IM-Code)
(IEC 60034-7:2020) (IEC 60034-7:2020)
This European Standard was approved by CENELEC on 2022-02-23. 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, 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: Rue de la Science 23, B-1040 Brussels
© 2022 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 60034-7:2022 E
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SIST EN IEC 60034-7:2022
EN IEC 60034-7:2022 (E)
European foreword
The text of document 2/2010/FDIS, future edition 3 of IEC 60034-7, prepared by IEC/TC 2 "Rotating
machinery" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as
EN IEC 60034-7:2022.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2022-11-23
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2025-02-23
document have to be withdrawn
This document supersedes EN 60034-7:1993 and all of its amendments and corrigenda (if any).
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.
This document has been prepared under a Standardization Request given to CENELEC by the
European Commission and the European Free Trade Association.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 60034-7:2020 was approved by CENELEC as a European
Standard without any modification.
2
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SIST EN IEC 60034-7:2022
IEC 60034-7
®
Edition 3.0 2020-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Rotating electrical machines –
Part 7: Classification of types of construction, mounting arrangements
and terminal box position (IM Code)
Machines électriques tournantes –
Partie 7: Classification des modes de construction, des dispositions
de montage et position de la boîte à bornes (Code IM)
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.160.01 ISBN 978-2-8322-8845-0
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
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SIST EN IEC 60034-7:2022
– 2 – IEC 60034-7:2020 © IEC 2020
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Code I (alpha-numeric designation) . 7
4.1 Designation of machines with horizontal shafts . 7
4.2 Designation of machines with vertical shafts . 9
4.3 Terminal box location . 12
5 Code II (all-numeric designation) . 12
5.1 Designation . 12
5.2 Significance of the first numeral . 13
5.3 Significance of the fourth numeral . 13
5.4 Significance of the second and third numerals . 13
5.5 Terminal box location . 14
5.6 Examples of designations . 14
5.7 Inclination or declination of shaft . 14
Annex A (informative) Relationship between Code I and Code II . 24
Bibliography . 25
Table 1 – Designations for machines with horizontal shafts (IM B.) . 8
Table 2 – Designations for machines with vertical shafts (IM V.) . 10
Table 3 – Code letter for terminal box location . 12
Table 4 – Significance of the first numeral . 13
Table 5 – Significance of the fourth numeral . 13
Table 6 – Significance of second and third numerals for first numeral 1 (Foot-mounted
machines with endshield bearing(s) only) . 15
Table 7 – Significance of second and third numerals for first numeral 2 (Foot-and-
flange-mounted machines with endshield bearing(s) only). 16
Table 8 – Significance of second and third numerals for first numeral 3 (Flange-
mounted machines with endshield bearing(s) only with a flange part of an endshield) . 17
Table 9 – Significance of second and third numerals for first numeral 4 (Flange-
mounted machines with endshield bearing(s) only with a flange not part of an
endshield, but an integral part of the frame or other component) . 18
Table 10 – Significance of second and third numerals for first numeral 5 (Machines
without bearings) . 19
Table 11 – Significance of second and third numerals for first numeral 6 (Machines
with endshield bearings and pedestal bearings) . 20
Table 12 – Significance of second and third numerals for first numeral 7 (Machines
with pedestal bearings only) . 21
Table 13 – Significance of second and third numerals for first numeral 8 (Vertical
machines of construction not covered by first numerals 1 to 4) . 22
Table 14 – Significance of second and third numerals for first numeral 9 (Machines
with special mounting arrangements) . 23
Table A.1 – Relationship between Code I and Code II for machines with horizontal
shafts (IM B.) . 24
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SIST EN IEC 60034-7:2022
IEC 60034-7:2020 © IEC 2020 – 3 –
Table A.2 – Relationship between Code I and Code II for machines with vertical shafts
(IM V.) . 24
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SIST EN IEC 60034-7:2022
– 4 – IEC 60034-7:2020 © IEC 2020
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ROTATING ELECTRICAL MACHINES –
Part 7: Classification of types of construction,
mounting arrangements and terminal box position (IM Code)
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 60034-7 has been prepared by IEC technical committee 2: Rotating
machinery.
This third edition cancels and replaces the second edition, published in 1992, and its
Amendment 1:2000. It constitutes a technical revision.
The main technical changes with regard to the previous edition are as follows:
5.4 Note on twin motors added.
5.5 Reference to 4.3 instead of duplication of text.
5.7 New subclause on marking of shaft inclination or declination.
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SIST EN IEC 60034-7:2022
IEC 60034-7:2020 © IEC 2020 – 5 –
The text of this International Standard is based on the following documents:
FDIS Report on voting
2/2010/FDIS 2/2018/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.
A list of all parts in the IEC 60034 series, published under the general title Rotating electrical
machines, can be found on the IEC website.
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 IEC 60034-7:2022
– 6 – IEC 60034-7:2020 © IEC 2020
ROTATING ELECTRICAL MACHINES –
Part 7: Classification of types of construction,
mounting arrangements and terminal box position (IM Code)
1 Scope
This part of IEC 60034 specifies the IM Code, a classification of types of construction, mounting
arrangements and the terminal box position of rotating electrical machines.
Two systems of classification are provided as follows:
– Code I (see Clause 4): An alpha-numeric designation applicable to machines with end-
shield bearing(s) and only one shaft extension.
– Code II (see Clause 5): An all-numeric designation applicable to a wider range of types
of machines including types covered by Code I.
The type of machine not covered by Code II is fully described in words.
The relationship between Code I and Code II is given in Annex A.
2 Normative references
There are no normative references in this document.
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
type of construction
arrangement of machine components with regard to fixings, bearing arrangement and shaft
extension
[SOURCE: IEC 60050-411:1996, 411-43-34]
3.2
mounting arrangement
orientation on site of the machine as the whole with regard to shaft alignment and position of
fixings
[SOURCE: IEC 60050-411:1996, 411-43-35]
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SIST EN IEC 60034-7:2022
IEC 60034-7:2020 © IEC 2020 – 7 –
3.3
shaft extension
portion of a shaft extending beyond an extreme bearing
Note 1 to entry: The bearing may be on the machine itself or be part of an assembly comprising a machine and (an)
additional bearing(s).
[SOURCE: IEC 60050-411:1996, 411-43-07]
3.4
drive-end of a machine
D-end
that end of the machine which accommodates the shaft end
Note 1 to entry: This is normally the driving end of a motor or the driven end of a generator.
Where for some machines the above definition is inadequate, the D-end is defined as follows:
a) Machine with two shaft extensions of different diameter: the end with the larger shaft diameter;
b) Machine with a cylindrical shaft extension and a conical shaft extension of the same diameter: the end with
cylindrical shaft extension;
c) Machine with other arrangements: according to IEC 60034-8 if applicable; otherwise by agreement.
Note 2 to entry: The outer diameter of a forged-on flange is taken to be the diameter of the shaft extension.
[SOURCE: IEC 60050-411:1996, 411-43-36]
3.5
non-drive end of the machine
N-end
that end of the machine opposite to the drive end
[SOURCE: IEC 60050-411:1996, 411-43-37]
4 Code I (alpha-numeric designation)
4.1 Designation of machines with horizontal shafts
In Code I, a machine with a horizontal shaft is designated by the code letters IM (International
Mounting), followed by a space, the letter B, one or two numerals as shown in Table 1 and an
optional letter as shown in 4.3.
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SIST EN IEC 60034-7:2022
– 8 – IEC 60034-7:2020 © IEC 2020
Table 1 – Designations for machines with horizontal shafts (IM B.)
Type of construction
Mounting
Number
Desig-
Sketch arrangement
of end-
nation
Feet Flange Other details
(Horizontal shaft)
shields
bearings
With Mounted by feet,
IM B3 2 – –
feet feet down
Endshield flange at
With Mounted on D-end
IM B5 2 – D-end with access
flange side of flange
to back
Mounted by feet,
With
IM B6 2 – – feet left
feet
(viewed from D-end)
Mounted by feet,
With
feet right
IM B7 2 – –
feet
(viewed from D-end)
With Mounted by feet,
IM B8 2 – –
feet feet up
Mounted on end
No endshield or
IM B9 1 – – face
bearing at D-end
of frame at D-end
With Special flange Mounted on D-end
IM B10 2 –
flange at D-end side of flange
Endshield spigot.
With Mounted on D-end
IM B14 2 – No access to back
flange side of flange
Flange at D-en
...
SLOVENSKI STANDARD
oSIST prEN IEC 60034-7:2020
01-marec-2020
Električni rotacijski stroji - 7. del: Razvrstitev vrst konstrukcije, montaže in
položaja priključne omare (koda IM)
Rotating electrical machines - Part 7: Classification of types of construction, mounting
arrangements and terminal box position (IM Code)
Machines électriques tournantes - Partie 7: Classification des formes de construction et
les dispositions de montage (Code IM)
Ta slovenski standard je istoveten z: prEN IEC 60034-7:2020
ICS:
29.160.01 Rotacijski stroji na splošno Rotating machinery in
general
oSIST prEN IEC 60034-7:2020 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN IEC 60034-7:2020
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oSIST prEN IEC 60034-7:2020
2/1976/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 60034-7 ED3
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2020-01-17 2020-04-10
SUPERSEDES DOCUMENTS:
2/1938/CD, 2/1950A/CC
IEC TC 2 : ROTATING MACHINERY
SECRETARIAT: SECRETARY:
United Kingdom Mr Charles Whitlock
OF INTEREST TO THE FOLLOWING COMMITTEES: PROPOSED HORIZONTAL STANDARD:
Other TC/SCs are requested to indicate their interest, if any, in
this CDV to the secretary.
FUNCTIONS CONCERNED:
EMC ENVIRONMENT QUALITY ASSURANCE SAFETY
SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING
Attention IEC-CENELEC parallel voting
The attention of IEC National Committees, members of
CENELEC, is drawn to the fact that this Committee Draft for
Vote (CDV) is submitted for parallel voting.
The CENELEC members are invited to vote through the
CENELEC online voting system.
This document is still under study and subject to change. It should not be used for reference purposes.
Recipients of this document are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.
TITLE:
Rotating electrical machines – Part 7: Classification of types of construction, mounting arrangements and
terminal box position (IM Code)
PROPOSED STABILITY DATE: 2022
NOTE FROM TC/SC OFFICERS:
Copyright © 2019 International Electrotechnical Commission, IEC. All rights reserved. It is permitted to download this
electronic file, to make a copy and to print out the content for the sole purpose of preparing National Committee positions.
You may not copy or "mirror" the file or printed version of the document, or any part of it, for any other purpose without
permission in writing from IEC.
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oSIST prEN IEC 60034-7:2020
– 2 – IEC CDV 60034-7 © IEC 2020
CONTENTS
Page
FOREWORD . 4
Section 1: Scope . 5
Section 2: Normative references . 5
Section 3: Definitions . 5
3.1 type of construction . 5
3.2 mounting arrangement. 5
3.3 shaft extension . 5
3.4 drive-end of a machine (D-end) . 6
3.5 non-drive end of the machine (N-end) . 6
Section 4: Code I (alpha-numeric designation) . 6
4.1 Designation of machines with horizontal shafts . 6
4.2 Designation of machines with vertical shafts. 9
4.3 Terminal box location . 11
Section 5: Code II (all-numeric designation) . 12
5.1 Designation . 12
5.2 Significance of the first numeral . 12
5.3 Significance of the fourth numeral . 13
5.4 Significance of the second and third numerals . 13
5.5 Terminal box location . 13
5.6 Examples of designations . 13
5.7 Inclination or declination of shaft . 13
Annex A (informative) Relationship between Code I and Code II . 23
Table 1 – Designations for machines with horizontal shafts (IM B.) . 7
Table 2 – Designations for machines with vertical shafts (IM V.) . 9
Table 3 – Significance of the first numeral . 12
Table 4 – Significance of the fourth numeral . 13
Table 5 – Significance of second and third numerals for first numeral 1
(Foot-mounted machines with endshield bearing(s) only) . 14
Table 6 – Significance of second and third numerals for first numeral 2
(Foot-and-flange-mounted machines with endshield bearing(s) only) . 15
Table 7 – Significance of second and third numerals for first numeral 3
(Flange-mounted machines with endshield bearing(s) only with a flange part of an endshield) . 16
Table 8 – Significance of second and third numerals for first numeral 4
(Flange-mounted machines with endshield bearing(s) only with a flange not part
of an endshield, but an integral part of the frame or other component) . 17
Table 9 – Significance of second and third numerals for first numeral 5
(Machines without bearings) . 18
Table 10 – Significance of second and third numerals for first numeral 6
(Machines with endshield bearings and pedestal bearings) . 19
Table 11 – Significance of second and third numerals for first numeral 7
(Machines with pedestal bearings only). 20
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oSIST prEN IEC 60034-7:2020
IEC CDV 60034-7 © IEC 2020 – 3 –
Page
Table 12 – Significance of second and third numerals for first numeral 8
(Vertical machines of construction not covered by first numerals 1 to 4) . 21
Table 13 – Significance of second and third numerals for first numeral 9
(Machines with special mounting arrangements) . 22
Table A.1 – Relationship between Code I and Code II for machines
with horizontal shafts (IM B.). 23
Table A.2 – Relationship between Code I and Code II for machines
with vertical shafts (IM V.) . 23
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oSIST prEN IEC 60034-7:2020
– 4 – IEC CDV 60034-7 © IEC 2020
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ROTATING ELECTRICAL MACHINES –
Part 7: Classification of types of construction, mounting arrangements
and terminal box position (IM Code)
FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of the 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, the IEC publishes International Standards. 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. The 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 the 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 National Committees.
3) The documents produced have the form of recommendations for international use and are published in the form
of standards, technical specifications, technical reports or guides and they are accepted by the National
Committees in that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject
of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60034-7: Classification of types of construction, mounting
arrangements and terminal box position (IM Code), has been prepared by IEC technical
committee 2: Rotating machinery.
This third edition cancels and replaces edition 2.1 published in 2000. It constitutes a technical
revision. The main technical changes with regard to the previous edition are as follows:
Clause Change
5.4 Note on twin motors added
5.5 Reference to Clause 4.3 instead of duplication of text
5.7 New clause on marking of shaft inclination or declination
This publication will remain unchanged until 20xx. At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
2WG 12(Sec)249
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oSIST prEN IEC 60034-7:2020
IEC CDV 60034-7 © IEC 2020 – 5 –
1 ROTATING ELECTRICAL MACHINES –
2
3 Part 7: Classification of types of construction, mounting arrangements
4 and terminal box position (IM Code)
5
6
7
8 Section 1: Scope
9 This part of IEC 60034 specifies the IM Code, a classification of types of construction,
10 mounting arrangements and the terminal box position of rotating electrical machines.
11 Two systems of classification are provided as follows:
12 – Code I (see section 2): An alpha-numeric designation applicable to machines with end-
13 shield bearing(s) and only one shaft extension.
14 – Code II (see section 3): An all-numeric designation applicable to a wider range of types
15 of machines including types covered by Code I.
16 The type of machine not covered by Code II should be fully described in words.
17 The relationship between Code I and Code II is given in annex A.
18 Section 2: Normative references
19 Section 3: Definitions
20 For the purposes of this part of IEC 60034, the following definitions apply:
21 3.1 type of construction
22 the arrangement of machine components with regard to fixings, bearing arrangement and
23 shaft extension
1)
24 (IEV 60411-13-34)
25 3.2 mounting arrangement
26 the orientation on site of the machine as the whole with regard to shaft alignment and position
27 of fixings
28 (IEV 60411-13-35)
29 3.3 shaft extension
30 a portion of a shaft extending beyond an extreme bearing
31 (IEV 60411-13-07)
32 NOTE The bearing may be on the machine itself or be part of an assembly comprising a machine and (an)
33 additional bearing(s).
34
________
1)
IEC 60050(411): 1973, International Electrotechnical Vocabulary (IEV) – Chapter 411: Rotating machinery.
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35 3.4 drive-end of a machine (D-end)
36 that end of the machine which accommodates the shaft end
37 (IEV 60411-13-36)
38 NOTE This is normally the driving end of a motor or the driven end of a generator.
39 Where for some machines the above definition is inadequate, the D-end is defined as follows:
40 a) Machine with two shaft extensions of different diameter: the end with the larger shaft
41 diameter;
42 b) Machine with a cylindrical shaft extension and a conical shaft extension of the same
43 diameter: the end with cylindrical shaft extention;
44 c) Machine with other arrangements: according to IEC 60034-8 if applicable; otherwise by
45 agreement.
46 NOTE The outer diameter of a forged-on flange is taken to be the diameter of the shaft extension.
47 3.5 non-drive end of the machine (N-end)
48 that end of the machine opposite to the drive end
49 (IEV 60411-13-37).
50
51 Section 4: Code I (alpha-numeric designation)
52 4.1 Designation of machines with horizontal shafts
53 In Code I, a machine with a horizontal shaft is designated by the code letters IM (International
54 Mounting), followed by a space, the letter B, one or two numerals as shown in Table 1 and an
55 optional letter as shown in clause 4.3.
56
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oSIST prEN IEC 60034-7:2020
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57 Table 1 – Designations for machines with horizontal shafts (IM B.)
Type of construction
Mounting
Number
Desig-
Sketch arrangement
of end-
nation
Feet Flange Other details
(Horizontal shaft)
shields
bearings
With Mounted by feet,
IM B3 2 – –
feet feet down
Endshield flange at
With Mounted on D-end
D-end with access
IM B5 2 –
flange side of flange
to back
Mounted by feet,
With
IM B6 2 – – feet left
feet
(viewed from D-end)
Mounted by feet,
With
IM B7 2 – – feet right
feet
(viewed from D-end)
With Mounted by feet,
IM B8 2 – –
feet feet up
No endshield or Mounted on end face
IM B9 1 – –
bearing at D-end of frame at D-end
With Special flange Mounted on D-end
IM B10 2 –
flange at D-end side of flange
Endshield spigot.
With Mounted on D-end
IM B14 2 – No access to back
flange side of flange
Flange at D-end
58
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59 Table 1 (continued)
Type of construction
Mounting
Number
Desig-
Sketch arrangement
of end-
nation
Feet Flange Other details
(Horizontal shaft)
shields
bearings
No endshield or
Mounted by feet,
bearing at D-end.
With feet down, with addi-
IM B15 1 – Additional mounting
feet tional mounting on
provisions on D-end
end face of frame
of frame
With
Mounted by feet,
IM B20 2 raised – –
feet down
feet
Mounted by feet,
With Endshield flange
With feet down, with addi-
IM B25 2 raised at D-end with access
flange tional mounting
feet to back
on flange
3 or 4 pads on
IM B30 2 – – Pad mounted
endshield(s) or frame
Mounted by feet,
Endshield spigot
With With feet down, with addi-
IM B34 2 No access to back
feet flange tional mounting on
Flange at D-end
D-end side of flange
Mounted by feet,
Endshield flange at
With With feet down, with addi-
IM B35 2 D-end with access
feet flange tional mounting on
to back
D-end side of flange
60
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61 4.2 Designation of machines with vertical shafts
62 In Code I, a machine with a vertical shaft is designated by the code letters IM (International
63 mounting), followed by a space, the letter V, one or two numerals as shown in Table 2 and an
64 optional letter as shown in Clause 4.3.
65 Table 2 – Designations for machines with vertical shafts (IM V.)
Type of construction
Mounting
Number
Desig-
Sketch arrangement
of end-
nation
Feet Flange Other details
(Vertical shaft)
shields
bearings
Endshield flange at Mounted on D-end
With
IM V1 2 – D-end with access side of flange,
flange
to back D-end down
Endshield flange at Mounted on N-end
With
IM V2 2 – N-end with access side of flange,
flange
to back D-end up
Endshield flange at Mounted on D-end
With
IM V3 2 – D-end with access side of flange,
flange
to back D-end up
Endshield flange at Mounted on N-end
With
IM V4 2 – N-end with access side of flange,
flange
to back D-end down
With Mounted by feet,
IM V5 2 – –
feet D-end down
With Mounted by feet,
IM V6 2 – –
feet D-end up
66
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oSIST prEN IEC 60034-7:2020
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67 Table 2 (continued)
T
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