Rotating electrical machines - Part 7: Classification of types of construction, mounting arrangements and terminal box position (IM Code)

IEC 60034-7:2020 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: An alpha-numeric designation applicable to machines with end-shield bearing(s) and only one shaft extension
- Code II: An all-numeric designation applicable to a wider range of types of machines including types covered by Code I.
This third edition cancels and replaces the second edition, published in 1992, and its Amendment 1:2000. The main technical changes with regard to the previous edition are as follows:
- note on twin motors added
- reference to 4.3 instead of duplication of text
- new subclause on marking of shaft inclination or declination.

Machines électriques tournantes - Partie 7: Classification des modes de construction, des dispositions de montage et position de la boîte à bornes (Code IM)

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

General Information

Status
Published
Publication Date
06-Oct-2020
Technical Committee
Current Stage
PPUB - Publication issued
Completion Date
07-Oct-2020
Ref Project

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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)
IEC 60034-7:2020-10(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
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
---------------------- Page: 3 ----------------------
– 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

---------------------- Page: 4 ----------------------
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

---------------------- Page: 5 ----------------------
– 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

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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.
---------------------- Page: 6 ----------------------
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.
---------------------- Page: 7 ----------------------
– 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]
---------------------- Page: 8 ----------------------
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.
---------------------- Page: 9 ----------------------
– 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-end
---------------------- Page: 10 ----------------------
IEC 60034-7:2020 © IEC 2020 – 9 –
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. feet down, with
With
IM B15 1 – Additional mounting addi-tional mounting
feet
provisions on D-end on
of frame end face of frame
With
Mounted by feet,
IM B20 2 raised – –
feet down
feet
Mounted by feet,
With Endshield flange
With feet down, with
IM B25 2 raised at D-end with access
flange addi-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 feet down, with
With With
IM B34 2 No access to back addi-tional mounting
feet flange
Flange at D-end on
D-end side of flange
Mounted by feet,
Endshield flange at feet down, with
With With
IM B35 2 D-end with access addi-tional mounting
feet flange
to back on
D-end side of flange
4.2 Designation of machines with vertical shafts

In Code I, a machine with a vertical shaft is designated by the code letters IM (International

mounting), followed by a space, the letter V, one or two numerals as shown in Table 2 and an

optional letter as shown in 4.3.
---------------------- Page: 11 ----------------------
– 10 – IEC 60034-7:2020 © IEC 2020
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
Mounted on end face
No endshield or
IM V8 1 – – of frame at D-end,
bearing at D-end
D-end down
Mounted on end face
No endshield or
IM V9 1 – – of frame at D-end,
bearing at D-end
D-end up
---------------------- Page: 12 ----------------------
IEC 60034-7:2020 © IEC 2020 – 11 –
Type of construction
Mounting
Number
Desig-
Sketch arrangement
of end-
nation
Feet Flange Other details
(Vertical shaft)
shields
bearings
Mounted on D-end
With Special flange
IM V10 2 – side of flange,
flange at D-end
D-end down
Mounted on D-end
With Special flange
IM V14 2 – side of flange,
flange at D-end
D-end up
Endshield flange Mounted by feet, with
With With at D-end with additional mounting on
IM V15 2
feet flange access D-end side of flange,
to back D-end down
Mounted on N-end
With Special flange
IM V16 2 – side of flange,
flange at D-end
D-end up
Mounted by feet, with
Endshield spigot
With With additional mounting on
IM V17 2 no access to back
feet flange D-end side of flange,
Flange at D-end
D-end down
Endshield spigot Mounted on D-end
With
IM V18 2 – no access to back side of flange,
flange
Flange at D-end D-end down
Endshield spigot Mounted on D-end
With
IM V19 2 – No access to back side of flange,
flange
Flange at D-end D-end up
3 or 4 pads on
Pad-mounted
IM V30 2 – – endshield(s) or
D-end down
frame
---------------------- Page: 13 ----------------------
– 12 – IEC 60034-7:2020 © IEC 2020
Type of construction
Mounting
Number
Desig-
Sketch arrangement
of end-
nation
Feet Flange Other details
(Vertical shaft)
shields
bearings
3 or 4 pads on
Pad-mounted,
endshield(s) or
IM V31 2
D-end up
frame
Endshield flange Mounted by feet, with
With With at D-end with additional mounting
IM V35 2
feet flange access on D-end side of flange,
to back D-end up
Mounted by feet, with
Endshield spigot
With With additional mounting
IM V37 2 no access to back
feet flange on D-end side of flange,
Flange at D-end
D-end up
4.3 Terminal box location

When designated, the terminal box position shall be coded with a final letter in accordance with

the following rules:
a) machines with feet shall be viewed from the D-end with the feet at 6 o’clock;

b) machines with flange only and with drains shall be viewed from the D-end and with the

drains at 6 o’clock;
c) other configurations shall not have a coding.
The coding shall conform to Table 3.
Table 3 – Code letter for terminal box location
Letter designation Terminal box location
R Right 3 o’clock
B Bottom 6 o’clock
L Left 9 o’clock
T Top 12 o’clock
None Unspecified
5 Code II (all-numeric designation)
5.1 Designation

In Code II, a machine is designated by the Code letters IM (International Mounting) followed by

a space and four numerals.

The first, second and third numerals designate aspects of construction (see 5.2 and 5.4).

---------------------- Page: 14 ----------------------
IEC 60034-7:2020 © IEC 2020 – 13 –
The fourth numeral designates the type of shaft extension (see 5.3).

When used, a letter following the four numerals shall designate the terminal box position,

see 5.5.
5.2 Significance of the first numeral
The significance of the first numeral is given in Table 4.
Table 4 – Significance of the first numeral
Table relevant
First
Significance to the second
numeral
and third numerals
0 Not allocated –
1 Foot-mounted machines with endshield bearing(s) only 5
2 Foot-and-flange-mounted machines with endshield bearing(s) only 6
3 Flange-mounted machines with endshield bearing(s) only, 7
with a flange part of an endshield
4 Flange-mounted machines with endshield bearing(s) only, 8
with a flange not part of an endshield but an integral part
of the frame or other component
5 Machines without bearings 9
6 Machines with endshield bearing(s) and pedestal bearing(s) 10
7 Machines with pedestal bearing(s) only 11
8 Vertical machines of construction not covered by 12
first numeral 1 to 4
9 Machines with special mounting arrangements 13
5.3 Significance of the fourth numeral
The significance of the fourth numeral is given in Table 5.
Table 5 – Significance of the fourth numeral
Fourth
Significance
numeral
0 No shaft extension
1 One cylindrical shaft extension
2 Two cylindrical shaft extensions
3 One conical shaft extension
4 Two conical shaft extensions
5 One flanged shaft extension
6 Two flanged shaft extensions
7 Flanged shaft extension (D-end)
and cylindrical shaft extension (N-end)
8 (Not allocated)
9 Other arrangement
5.4 Significance of the second and third numerals

The significance of the second and third numerals is specified in Table 6 to Table 14 depending

on the first numeral with which they are associated (see Table 4).
---------------------- Page: 15 ----------------------
– 14 – IEC 60034-7:2020 © IEC 2020

NOTE Rolling mill main motors can be used in a twin arrangement, where one of the upper/lower twin motors or the

side-by-side twin motors drives the upper roll for the rolling mill, while the other drives the lower roll for the mill, so

that the completely same speed control response for both twin motors can be obtained.

5.5 Terminal box location
See the information of 4.3.
5.6 Examples of designations

In Table 6 through Table 14, common types of construction and mounting arrangements are

illustrated by sketches, and their designations are given using a particular fourth numeral. Other

fourth numerals could be applicable (see Table 5). The absence of a sketch does not imply that

a designation is not available.

Numerals to which a significance has been allocated in the appropriate tables may be combined

to form a valid designation. Some of these designations may be impracticable.
5.7 Inclination or declination of shaft

Machines whose shaft orientation is other than horizontal (0°) or vertical (±90°) shall have their

IM code followed by the appropriate angle designation referenced to the drive end, such as:

• IM1001 +7,5° (positive degrees always means DE-shaft up, i. e. inclination of shaft)

• IM7311 −7,5° (negative degrees always means DE-shaft down, i. e. declination of shaft).

NOTE An inclination or declination may require special bearing design as the bearings carry an additional thrust

load caused by the gravity force of the machine’s rotor.
---------------------- Page: 16 ----------------------
IEC 60034-7:2020 © IEC 2020 – 15 –
Table 6 – Significance of second and third numerals for first numeral 1
(Foot-mounted machines with endshield bearing(s) only)
Machine
Designation and sketch (see 3.5)
construction
Third numeral
Numbe
0 1 2 3 4 5 6 7 8 9
Feet
of (Shaft (Shaft
(gearbox)
(D-end (D-end left, (D-end
bearing horizontal, (D-end up) horizontal,
down) feet at right,
s feet down) feet up
back) feet at
back)
IM 1001 IM 1011 IM 1031 IM 1051 IM 1061 IM 1071
...

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