IEC 63267-2-1:2024

SLOVENSKI STANDARD
01-marec-2001
Dimensions and output series for rotating electrical machines - Part 1: Frame
numbers 56 to 400 and flange numbers 55 to 1080
Dimensions and output series for rotating electrical machines - Part 1: Frame numbers
56 to 400 and flange numbers 55 to 1080
Dimensions et séries de puissances des machines électriques tournantes - Partie 1:
Désignation des carcasses entre 56 et 400 et des brides entre 55 et 1080
Ta slovenski standard je istoveten z: IEC 60072-1
ICS:
29.160.01 Rotacijski stroji na splošno Rotating machinery in
general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

NORME CEI
INTERNATIONALE IEC
72-1
INTERNATIONAL
Sixième édition
STANDARD Sixth edition
1991-02
Dimensions et séries de puissances
des machines électriques tournantes
Partie 1:
Désignation des carcasses entre 56 et 400
et des brides entre 55 et 1080
Dimensions and output series for
rotating electrical machines
Part 1:
Frame numbers 56 to 400 and
flange numbers 55 to 1080
© CEI 1991 Droits de reproduction réservés — Copyright — all rights reserved
Aucune partie de cette publication ne peut être reproduite ni No part of this publication may be reproduced or utilized in
utilisée sous quelque forme que ce soit et par aucun pro- any form or by any means, electronic or mechanical,
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CODE PRIX "^
International Electrotechnical Commission
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Pour prix, voir catalogue en vigueur
For price, see current catalogue

72-1 © CEI — 3 —
CONTENTS
Page
FOREWORD 5
Clause
1. Scope 7
2. Letter-symbols for dimensions 7
3. Designation of machines
4. Location of the terminal box
4.1 Machines with feet
4.2 Machines with flange only 11
Position of holes in the mounting flange 11
5.
6. Fixing dimensions
6.1 Foot-mounted machines 11
6.2 Flange-mounted machines 17
Shaft extension, keys and keyways dimensions. Greatest permissible torques on continuous
7.
duty for a.c. motors 19
8. Tolerances for flange-mounted machines 21
8.1 Shaft extension run-out 21
8.2 Concentricity of spigot diameter and perpendicularity of mounting face of flange to
shaft 23
Methods of measurement 23
8.3
8.3.1 Shaft extension run-out 23
8.3.2 Concentricity of spigot and shaft 25
8.3.3 Perpendicularity of mounting face of flange to shaft
Tolerances for machines other than flange-mounted machines 25
8.4
9. Preferred rated output values
10. Dimensional sketches
ANNEXES
A Guide for the selection of dimensions 33
B Reference planes and symbols for mounting dimensions of rotating electrical machines 45
C General requirements on tolerances and limit values for mounting dimensions 89
D Conversion millimetre/inches and kilowatt/horsepower

— 5 —
72-1 © IEC
INTERNATIONAL ELECTROTECHNICAL COMMISSION
DIMENSIONS AND OUTPUT SERIES
FOR ROTATING ELECTRICAL MACHINES
Part 1: Frame numbers 56 to 400 and flange numbers 55 to 1080
FOREWORD
1) The formal decisions or agreements of the IEC on technical matters, prepared by Technical Committees on which all the
National Committees having a special interest therein are represented, express, as nearly as possible, an international
consensus of opinion on the subjets dealt with.
2) They have the form of recommendations for international use and they are accepted by the National Committees in that sense.
3) In order to promote international unification, the IEC expresses the wish that all National Committees should adopt the text of
the IEC recommendation for their national rules in so far as national conditions will permit. Any divergence between the IEC
recomendation and the corresponding national rules should, as far as possible, be clearly indicated in the latter.
This part of the International Standard IEC 72 has been prepared by Sub-Committee 2B: Mounting
dimensions and output series, of IEC Technical Committee No. 2 : Rotating machinery.
This sixth edition of IEC 72-1 replaces the fifth edition of IEC 72 (1971) and its Amendments Nos. 1
and 2, issued in 1977 and 1981 respectively.
The text of this part is based on the following documents:
Two Months' Procedure Reports on Voting
Six Months' Rule Reports on Voting
2B(CO)65
2B(CO)51 2B(CO)56 2B(CO)60
2B(CO)52 2B(CO)57 . — —
2B(CO)68A 2B(CO)71
2B(CO)61 2B(CO)66
2B(CO)62 2B(CO)67 — —
2B(CO)70 2B(CO)73 — —
Full information on the voting for the approval of this can be found in the Voting Reports indicated in
the above table.
Annexes A, B and C have the status of a report; annex is informative.
The following publications are quoted in this part of IEC 72:
IEC 34-1: 1983, Rotating electrical machines — Part 1: Rating and performance.
IEC 34-8: 1972, Rotating electrical machines — Part 8: Terminal markings and direction of rotation machines.
IEC 50(411): 1973 , International Electrotechnical Vocabulary (IEV) — Chapter 411: Rotating machines.
Fasteners — Clearance holes for bolts and screws.
ISO 273: 1979,
Driving and driven machines — Shaft heights.
ISO 496: 1973,
Rectangular or square parallel keys and their corresponding keyways (dimensions in millimetres).
ISO/R 773: 1969,
ISO/R 775: 1969, Cylindrical and 1/10 conical shaft ends.
ISO 1101: 1983, Technical drawings — geometrical tolerancing — tolerancing of form, orientation, location and run-out —
Generalities, definitions, symbols, indications on drawings.
ISO 2768: 1973, Permissible machining variations in dimensions without tolerance indication.

72-1 © IEC — 7 —
DIMENSIONS AND OUTPUT SERIES
FOR ROTATING ELECTRICAL MACHINES
Part 1: Frame numbers 56 to 400 and flange numbers 55 to 1080
1. Scope
This part of IEC 72 covers the majority of rotating electrical machines for industrial purposes
within the dimension range :
Foot-
mounted : — shaft-heights: 56 mm to 400 mm
Flange-
mounted : — pitch circle diameter of flange : 55 mm to 1080 mm
It gives tables of fixing dimensions, shaft extension dimensions and output powers. Maximum
permissible torques for continuous duty on a.c. motors are listed for various shaft diameters.
NOTE — The dimensions for machines with shaft heights 355 mm and 400 mm, given in this standard, are included among
the values given in IEC 72-2.
2. Letter-symbols for dimensions
The symbols defined below are illustrated by the dimensional sketches in clause 10.
A — distance between centre-lines of fixing holes (end view).
AA — width of the end of the foot (end view).
AB — over-all dimension across the feet (end view).
AC — diameter of the machine.
AD —
distance from the centre-line of the machine to extreme outside of the terminal box or other
most salient part mounted on the side of the machine.
B —
distance between the centre-lines of the fixing holes (side view).
BA — length of the foot (side view).
BB —
over-all dimension across the feet (side view).
C —
distance from the shoulder on the shaft at D-end to the centre-line of the mounting holes in
the nearest feet.
CA — distance from the shoulder on the shaft at N-end to the centre-line of the mounting holes in
the nearest feet.
D — diameter of the shaft extension at D-end.
DA —
diameter of the shaft extension at N-end.
E — length of the shaft extension from the shoulder at D-end.
EA — length of the shaft extension from the shoulder at N-end.
F — width of the keyway of the shaft extension at D-end.
FA — width of the keyway of the shaft extension at N-end.
G — distance from the bottom of the keyway to the opposite surface of the shaft extension
at D-end.
GA — distance from the top of the key to the opposite surface of the shaft extension at D-end.
GB — distance from the bottom of the keyway to the opposite surface of the shaft extension
at N-end.
72-1 © IEC — 9 —
GC — distance from the top of the key to the opposite surface of the shaft extension at N-end.
GD —
thickness of the key of the shaft extension at D-end.
GE — depth of the keyway at the crown of the shaft extension at D-end.
GF — thickness of the key of the shaft extension at N-end.
GH — depth of the keyway at the crown of the shaft extension at N-end.
H —
distance from the centre-line of the shaft to the bottom of the feet (basic dimension).
H' — distance from the centre-line of the shaft to the mounting surface — e.g. the bottom of the
feet in the feet-up version.
thickness of the feet.
HA —
HC — distance from the top of the horizontal machine to the bottom of the feet.
HD —
distance from the top of the lifting eye, the terminal box or other most salient part mounted
on the top of the machine to the bottom of the feet.
HE — distance from the mounting surface to the lowest part of the machine in the feet-up version.
K — diameter of the holes or width of the slots in the feet of the machine.
L — overall length of the machine with a single shaft extension.
LA — thickness of the flange.
LB — distance from the mounting surface of the flange to the end of the machine.
LC — overall length of the machine when there is a shaft extension at N-end.
M — pitch circle diameter of the fixing holes.
N —
diameter of the spigot.
P —
outside diameter of the flange, or in the case of a non-circular outline twice the maximum
radial dimension.
R — distance from the mounting surface of the flange to the shoulder on the shaft.
S — diameter of the fixing holes in the mounting flange or nominal diameter of thread.
T —
depth of the spigot.
NOTE — The definition of D-end and N-end of a machine is given in IEC 34-8.
3. Designation of machines
Foot-mounted machines may be designated by the frame number followed immediately by the
diameter of the shaft extension.
Examples: 112 M 28
Flange-mounted machines may be of three different designs:
—
Flange with free holes (clearances holes), denoted: FF flange;
—
Flange with tapped holes and with spigot diameter Nsmaller than the pitch circle diameter of the
fixing holes M, denoted: FT flange;
—Flange with tapped holes and with spigot diameter Ngreater than the pitch circle diameter of the
fixing holes M, denoted: FI flange.
These symbols shall form part of the respective flange numbers. Machines having only flange
mounting may be designated by the diameter of the shaft extension immediately followed by the
letters FF, FT or FI and the flange number.

Examples: with free holes: 28FF215

with tapped holes: 28 FT 165
or 28 FI 165 as applied
72-1 ©IEC — 11 —
When a foot-mounted machine is also provided with a flange at the drive end (D-end) the letters
FF, FT or FI and the flange number may be added immediately after the shaft diameter.
Examples: Flange with free holes: 112M28FF215
Flange with tapped holes: 112 M28 FT 165
or 112 M28 FI 165 as applied
4. Location of the terminal box
4.1 Machines with feet
The terminal box on a motor shall be situated with its centre-line within a sector ranging from the
top to 10° below the horizontal centre-line of the motor on the right-hand side, when looking at the
D-end of the motor. No recommendation is decided upon for generators.
It is recommended that unless the terminal box is on the top, motors be so constructed that the
terminal box may be located on the left-hand side by the manufacturer, if requested by the user at
the time when the motor is ordered.
NOTE — Provision should preferably be made so as to enable the cable entry to the terminal box to be in any one of four
directions at right angles.
4.2 Machines with flange onty
No recommendation.
5. Position of holes in the mounting flange
When a flange-mounted machine also has feet, the holes in the flange shall be spaced from the
diameter of the flange perpendicular to the mounting plane of the feet as follows.
45 ° for 4 holes
22,5 ° and 67,5 ° for 8 holes (see clause 10)
6. Fixing dimensions
6.1 Foot-mounted machines
72-1 © IEC - 13 -
Table 1 - Dimensions for machines with shaft-heights from 56 mm to 400 mm
K2)
H A B°) C
Bolt or
Frame
Nominal Tolerance3^
number '> Nominal Maximum
screw
deviation
mm µm µm
mm mm mm mm mm
+ 300 0 M5
56 M 56 - 0,5 90 71 36 5,8
7 + 360 0 M6
63 M 63 - 0,5 100 80 40
90 45 7 + 360 0 M6
71 M 71 - 0,5 112
100 50 10 + 360 0 M8
80 M 80 - 0,5 125
+ 0 M8
90 S 90 - 0,5 140 100 56 10 360
+ 360 0 M8
90 L 90 - 0,5 140 125 56 10
12 + 430 0 M10
100 S 100 - 0,5 160 112 63
63 12 + 430 0 M10
100 L 100 - 0,5 160 140
M10
112 S 112 - 0,5 190 114 70 12 + 430 0
0 M10
112 M 112 - 0,5 190 140 70 12 + 430
+ 0 M10
(112 L) 112 - 0,5 190 159 70 12 430
140 12 + 430 0 M10
132 S 132 - 0,5 216 89
12 + 430 0 M10
132 M 132 - 0,5 216 178 89
89 12 + 430 0 M10
(132 L) 132 - 0,5 216 203
- 0,5 254 178 108 14,5 + 430 0 M12
160 S 160
M12
- 0,5 254 210 108 14,5 + 430 0
160 M 160
+ 0 M12
160 L 160 - 0,5 254 254 108 14,5 430
14,5 + 430 0 M12
180 S 180 - 0,5 279 203 121
14,5 + 430 0 M12
180 M 180 - 0,5 279 241 121
279 121 14,5 + 430 0 M12
180 L 180 - 0,5 279
- 0,5 318 228 133 18,5 + 520 0 M16
200 S 200
M16
200 M 200 - 0,5 318 267 133 18,5 + 520 0
200 L 200 - 0,5 318 305 133 18,5 + 520 0 M16
+ 520 0 M16
225 S 225 - 0,5 356 286 149 18,5
149 18,5 + 520 0 M16
225 M 225 - 0,5 356 311
+ 520 0 M16
(225 L) 225 - 0,5 356 356 149 18,5
- 0,5 406 311 168 24 + 520 0 M20
250 S 250
M20
250 M 250 - 0,5 406 349 168 24 + 520 0
- 0,5 406 406 168 24 + 520 0 M20
(250 L) 250
+ 0 M20
280 S 280 - 1 457 368 190 24 520
24 + 520 0 M20
280 M 280 - 1 457 419 190
+ 520 0 M20
(280 L) 280 - 1 457 457 190 24
406 216 28 + 520 0 M24
315 S 315 - 1 508
508 457 216 28 + 520 0 M24
315 M 315 - 1
508 216 28 + 520 0 M24
(315 L) 315 - 1 508
+ 0 M24
355 S 355 - 1 610 500 254 28 520
M24
355 M 355 - 1 610 560 254 28 + 520 0
+ 0 M24
355 L 355 - 1 610 630 254 28 520
280 35 + 620 0 M30
400 S 400 - 1 686 560
35 + 620 0 M30
400 M 400 - 1 686 630 280
710 280 35 + 620 0 M30
400 L 400 - 1 686
Frame numbers within brackets should be regarded as non-preferred for a.c. induction machines.
1)
2)Open-ended slots are not permitted.
3) These tolerances are those given in coarses series H14 of ISO 2768.
4)Those dimensions are preferred-Additional recommended values for B dimension are given in table 2.

72-1 © IEC — 15 —
Table 2 — Recommended values for B dimension
Dimensions in millimetres
Frame number letter
Frame number
numeral
Z Y F ED
G C BA
45 50 56 63 71 80 90 100 112 125 140
63 50 56 63 71 80 90 100 112 125 140 160
56 63 71 80 90 100 112 125 140 160 180
63 71 80 90 100 112 125 140 160 180 200
71 80 90 100 112 125 140 160 180 200 224 250
80 90 100 112 125 140 160 180 200 224 250 280 315
112 125
80 90 100 114 140 159 180 200 224 250 280 315 355 400 450
132 100 112
125 140 160 178 203 224 250 280 315 355 400 450 500 560
160 112 125 140 160 200 210
178 254 280 315 355 400 450 500 560 630 710
180 125 140 160 180 203 224 241 279 315 400 450 710
355 500 560 630 800
200 140 160 180 200 228 250 267
305 355 400 450 500 560 630 710 800 900
225 160 180 200 224 250 286 311 356 400 450 500 560 630 710
800 900 1000
250 180 200 224 250 280 311 349 406 450 500 560 630 710 800 900 1000 1120
280 200 224 250 280 315 368 419 457 500 560 630 710 800 900 1000 1120 1250
315 224 250 280 315 355 406 457 508 560 630 710 800 900 1000 1120 1250 1400
355 280 315 355 400 450 500 560 630 710 800 900 1000 1120 1250 1400 1600 1800
400 315 355 400 450 500 560 630 710 800 900 1000 1120 1250 1400 1600 1800 2000
NOTES
1 Values printed in italics are repeated from table 1.
2 In special cases, instead of the above values, a value from the R 40 series may be retained.
In this case two adjacent letters of the above table are used, e.g. frame number 225 DC for B= 850 mm.

72-1 © IEC — 17 —
6.2 Flange-mounted machines
Machines having both feet and flange should preferably have
A, B and C dimensions selected
from table 1.
Table 3 — Dimensions for flanges with pitch circle diameters from 55 mm to 1080 mm.
Flange M N PZ) R S Tapped T
number Free holes (FF) holes Maximum
Number
(FT)3>
of
FF - FT
Nominal ISO tolerance Nominal ISO tolerance
holes
mm mm mm mm µm µm thread mm
µm mm mm
55 55 40 j6 + 11 — 5 70 0 4 5,8 H14 + 300 0 M5 2,5
65 65 50 j6 + 11 — 5 80 0 4 5,8 H14 + 300 0 M5 2,5
75 75 60 j6 + 12 — 7 90 0 4 5,8 H14 + 300 0 M5 2,5
85 85 70 j6 + 12 — 7 105 0 4 7 H14 + 360 0 M6 2,5
100 100 80 j6 + 12 — 7 120 0 4 7 H14 + 360 0 M6 3
115 115 95 j6 + 13 — 9 140 0 4 10 H14 + 360 0 M8 3
130 130 I10 j6 + 13 — 9 160 0 4 10 H14 + 360 0 M8 3,5
165 165 130 j6 + 14 — 11 200 0 4 12 H14 + 430 0 M10 3,5
215 215 180 j6 + 14 — 11 250 0 4 14,5 H14 + 430 0 M12 4
265 265 230 j6 + 16 — 13 300 0 4 14,5 H14 + 430 0 M12 4
300 300 250 j6 + 16 — 13 350 0 4 18,5 H14 + 520 0 M16 5
350 350 300 j6 + 16 — 16 400 0 18,5 H14 + 520 0 M16 5
400 400 350 j6 + 18 — 18 450 0 8 18,5 H14 + 520 0 M16 5
18,5
500 500 450 j6 + 20 — 20 550 0 8 H14 + 520 0 M16 5
600 600 550 js6 + 22 — 22 0 24 H14 +
660 8 520 0 M20 6
740 740 680 js6 + 25 — 25 800 0 8 24 H14 + 520 0 M20 6
940 880 js6 + 28 — 28 1000 0 8 28 H14 + 520 0 M24 6
1080 1080 1000 js6 + 1150 0 H14 + 520 0 M24 6
28 — 28 8 28
')
This table does not apply to FI flange.
2) The external outline of mounting flanges up to and including FF 300 and FT 300 may be other than circular. Dimension Pmay deviate from
that given in the table only on the minus side.
3)
For FT flange-mounted machines, it is recommended that the free holes in the mounting part should be as shown in column S for the
corresponding size of FF flange.

7. Shaft extension, keys and keyways dimensions. Greatest permissible torques on continuous duty for a.c. motors
Table 4
Greatest
Keyway GA
Key
Diameter E
permissible
(GC)
(EA)2)
D u
GE (GH)
F (FA) Nom- torque on
F (FA) GD (GF)
(DA)
continuous
inal 4)
Nom- Tolerance
Nom- Tolerance Tolerance
Nom- Tolerance duty for
Tolerance Nom- Tolerance
Nom-
final
final N93) P93)
h9 final a.c. motor 5)
final final
Desig-
Desig-
nation
nation
ISO
ISO
mm Nm
µm pm mm pm pm
µm mm µm pm
mm mm µm µm mm .tm
mm µm µm
0,25
-31 1,2 +100 0 7,8
2 -4 -29 - 6
2 0 -25 2 h9 0 - 25
7 j6 + 7 - 2 16
0,63
-31 1,8 +100 0 10,2
- 25 3 -4 -29 - 6
0 -25 3 h9 0
9 j6 + 7 - 2 20 3
1,25
-30 -12 -42 2,5 +100 0 12,5
0 - 30 4 0
23 4 0 -30 4 h9
11 j6 + 8 - 3
16 2,8
-12 -42 3 +100 0
0 - 30 5 0 -30
0 -30 5 h9
14 j6 + 8 - 3 30 5
18 4,1
-30 -12 -42 3 +100 0
h9 0 - 30 5 0
40 5 0 -30 5
16 j6 + 8 - 3
0 20,5 7,1
-30 -12 -42 3,5 +100
h9 0 - 30 6 0
+ 8 - 3 40 6 0 -30 6
18 j6
21,5 8,25
-30 -12 -42 3,5 +100 0
h9 0 - 30 6 0
40 6 0 -30 6
19 j6 + 9 - 4
0 24,5 14
-30 -12 -42 3,5 +100
0 - 30 6 0
+ 9 - 4 50 6 0 -30 6 h9
22 j6
0 27 18
-36 -15 -51 4 +200
h11 0 - 90 8 0
50 8 0 -36 7
24 j6 + 9 - 4
31,5
-51 4 +200 0 31
8 0 -36 -15
8 0 -36 7 hll 0 - 90
28 j6 + 9 - 4 60
-15 -51 5 +200 0 35
0 - 90 10 0 -36
0 -36 8 hll
32 k6 +18 + 2 80 10
-15 -51 5 +200 0 41
hll 0 - 90 10 0 -36
10 0 -36 8
38 k6 +18 + 2 80
-61 +200 0 45
12 0 -43 -18 5
-43 8 hll 0 - 90
k6 +18 + 2 110 12 0
-18 -61 5,5 +200 0 51,5
h11 0 - 90 14 0 -43
14 0 -43 9
48 k6 +18 + 2 110
-18 -61 6 +200 0 59
0 - 90 16 0 -43
+11 110 16 0 -43 10 hll
55 m6 +30
-18 -61 7 +200 0 64
0 -110 18 0 -43
0 -43 11 hll
60 m6 +30 +11 140 18
69 630
-18 -61 7 +200 0
-110 18 0 -43
18 0 -43 11 hll 0
65 m6 +30 +11 140
0 74,5 800
-22 -74 7,5 +200
hll 0 -110 20 0 -52
20 0 -52 12
70 m6 +30 +11 140
-22 -74 7,5 +200 0 79,5
hll -110 20 0 -52
20 0 -52 12 0
75 m6 +30 +11 140
-22 -74 9 +200 0 85
-110 22 0 -52
0 -52 14 hll 0
m6 +30 +11 170 22
-22 -74 9 +200 0 90
0 -110 22 0 -52
22 0 -52 14 hll
m6 +35 +13 170
-74 9 +200 0 95
25 0 -52 -22
14 hll 0 -110
+35 +13 170 25 0 -52
90 m6
-74 9 +200 0 100
25 0 -52 -22
-52 14 hll 0 -110
m6 +35 +13 170 25 0
10 +200 0 106
-110 28 0 -52 -22 -74
0 -52 16 hll 0
100 m6 +35 +13 210 28
-74 10 +200 0 116
-110 28 0 -52 -22
16 hll 0
m6 +35 +13 210 28 0 -52
For diameters up to 25 mm, a shoulder of 0,5 mm is considered sufficient.
1)
In cases where the service conditions are well defined, shaft extensions might also be selected in accordance with existing ISO standards.
2)
The keyway tolerance N9 applies for normal keys and P9 for fitted keys.
3)
can be calculated from values of the other dimensions given in the table.
4) Tolerances for GA
The torque values are chosen from the R 40 series. In cases where the operating conditions are well defined, torque values might also be selected in accordance with existing ISO standards.
5)
—
72-1 © lEC 21 —
8. Tolerances for flange-mounted machines
8.1 Shaft extension run-out
Table 5
Shaft extension run-out
D
Normal class Precision class
(only on request)
mm µm µm
10 30 15
D <
35 18
10< D< 18
30 40 21
18 < D<
50 25
30 < D < 50
50 < D 80 60 30
<
80 < D 120 70 35
<
72-1 © IEC
— 23 —
8.2
Concentricity of spigot diameter and perpendicularity of mounting face of flange to shaft
Table 6
Flange number N P
Maximum permissible change
in indicator reading
FF - FT
Normal class Precision class
(only on request)
mm mm µm
µm
55 40 70
80 40
65 50 80 80
75 60
90 80 40
85 70 105 80 40
100 80 120 80 40
115 95 140 80 40
130 110
160 100 50
165 130
200 100 50
215 180
250 100 50
265 230 300 100 50
300 250 350 125
350 300 400 125 63
350 450 125 63
450 550 125 63
550 660 160 80
740 680 800 160 80
940 880 1000 200
1080 1000 1150 200 100
8.3 Methods of measurement
8.3.1
Shaft extension run-out
Apply the point of the indicator to the shaft, midway along its length. Read the maximum and
minimum values on the indicator through one slow revolution of the shaft. The difference between
the readings shall not exceed the value given in table 5.
i
Ei2
L.
72-1 ©IEC — 25 —
8.3.2 Concentricity of spigot and shaft
Fix the indicator rigidly on the shaft extension, by means of a device similar to that shown in the
figure, at a distance of about 10 mm from the mounting face of the flange. Read the maximum and
minimum values on the indicator through one slow revolution of the shaft.
The difference betwen the extreme readings of the concentricity test indicator shall not exceed
the values given in table 6.
It is recommended that the test be carried out on the machine set up with shaft vertical so as to
make the measurement free from the effect of gravity.
8.3.3 Perpendicularity of mounting face of flange to shaft
Fix the indicator rigidly on the shaft extension, by means of a device similar to that shown in the
figure, at a distance of about 10 mm from the mounting face of the flange. Read the maximum and
minimum values on the indicator through one slow revolution of the shaft.
The difference between the extreme readings of the perpendicularity indicator shall not exceed
the values given in table 6.
It is recommended that the test be carried out on the machine set up with shaft vertical so as to
eliminate the axial clearance in the bearing.
8.4 Tolerances for machines other than flange-mounted machines
The shaft extension run-out for machines other than flange-mounted machines shall not exceed
the value specified in table 5 when measured as specified in 8.3.1.

— 27 —
72-1 © IEC
9. Preferred rated output values
Table 7
In kW (motors) or kVA (generators)
kW (kVA)
Secondary series^^
Primary series
0,06
0,09
0,12
0,18
0,25
0,37
0,55
0,75
1,1
1,5
1,8
2,2
3,7
5,5
6,3
7,5
18,5
1) To be used as intermediate values only in cases of special need.

72-1 © IEC
— 29 —
Table 7 (continued)
kW (kVA)
Primary series Secondary series
—31 —
72-1 © IEC
10. Dimensional sketches
10. Plans dimensionnels
—AD
... LC AC
-
r
r=—
HC HD
BA
_ K
— ^
I
E--.
C+^--B— .•■•t- CA --4■r-
EA-i^—
^---BB---001
AB
r L
LB
LA
----^
r
N D
FF
ou/or FT 1)
R
E
2)
080/77
U FF - accès par l'arrière. I )
FF - access to back.
FT - pas d'accès par l'arrière. FT - no access to back.
2) Ce symbole [SO indique le mode de projection utilisé. This (SO symbol indicates the projection method used.
2 )
72-1 © IEC —33
Annex A
Guide for the selection of dimensions
Introduction
This annex is a guide for the selection of dimensions and should be considered as a guide for
future designs. It has the status of a report and does not replace nor interfere with IEC 72-1 and 72-2
which apply within the strict limits of their scopes.
References planes and symbols for mounting dimensions of rotating electrical machines are
given in annex B.
General requirements on tolerances and limit values of these dimensions are given in annex C.
A.1 Scope
This guide for the selection of dimensions applies to rotating electrical machines within the field
covered by IEC 34-1.
This annex sets forth basic series and alternative series for some mounting dimensions.
In a specific machine document, when values are selected from either the basic series or the alter-
native series, the selected values have equal status.
NOTE — The letter symbols used in the former IEC 72 and 72A, now 72-1 and 72-2, are replaced in this annex by the
symbols used in annex B.
A.2 Mounting dimensions to assure interchangeability of machines
A.2.1 Foot-mounted machines
The mounting plane of the feet may be below, on or above the shaft centre line.
A.2.1.1 Dimensions H10 (shaft height)
A.2.1.1.1 Machines with the mounting plane of the feet below the lowest point of the frame (feet down) :
basic series for H10.
The basic series is taken from ISO 496-Series III. The series is open at both ends. It includes all the
values of the R 20 series.
A.2.1.1.2 Machines with the mounting plane of the feet below the lowest point of the frame (feet down) :
alternative series for H10.
The alternative series is taken from ISO 496-Series IV. The series is open at the lower end and
closed at the value 375.
It includes the values of the R 40 series which are not included in the R 20 series (the series known
as R 40/2) for example : 95, 106, 118, 132, 150, 170, 190.

72-1 ©IEC — 35 —
A.2.1.1.3 Machines with the mounting plane of the feet above the lowest point of the frame (feet up):
serie for H10.
The series is open at both ends. It includes all the values of the R 10 series plus the value zero.
A.2.1.2 Dimensions B10 and L10
(distances between centre lines of mounting holes)
A.2.1.2.1
Basic series
The basic series is the R 20 series, open at both ends.
A.2.1.2.2
Alternative series
The alternative series is the R 40/2 series, open at both ends. For a given value of H10 consecutive
values for dimension B10 shall be separated by at least one R 20 step.
A.2.1.3 Dimensions L11 and L16 (distances from the longitudinal reference plane to the centre line of the
nearest fixing hole in the feet)
The values are those of the R 40 series, open at both ends but values below 50 mm are rounded to
the R 40 series, e.g.: 45, 48, 50, 53, 56, 60, 63.
For larger machines (H > 400 mm) L11 and L16 values may be zero or measured from the centre
of the machine.
A.2.1.4 Dimensions Dll
(diameter of the fixing holes or width of the slots in the feet)
The values are taken from the coarse series in ISO 273-part III and are given below with the
corresponding thread sizes for mounting bolts:
2 2,6 3,1 3,6 4,8 5,8 7 10
M1,6 M2 M2,5 M3 M4 M5 M6 M8
12 14,5
18,5 24 28 35 42
48 56
M10 M12 M16 M20
M24 M30 M36 M42 M48
A.2.1.5
Rules for the choice of sets of dimensions for foot-mounted machines
A.2.1.5.1 Dimension HIO
(shaft height)
Values from the basic series should be used whenever suitable, but some values from the
alternative series may be introduced in a specific document.
A.2.1.5.2
Other dimensions in a specific document
Some values from the alternative series may be introduced.
A.2.2 Flange-mounted machines
A.2.2.1 Flange FF or FT type with spigot diameter D20 or D24 > 1000 mm

72-1 ©IEC — 37 —
A.2.2.1.1
Dimensions, number of holes and the fitting screw size and thread
The nominal values shown in table A.1 apply.
Flanges designated by FF followed by the nominal value of a pitch circle diameter D22 or D27
have clearance mounting holes of diameter D21 or D26.
Flanges designated by FT followed by the nominal value of D22 or D27 have mounting holes
tapped with the thread size in table A.1.
FT-type flanges are limited up to and including FT740.
Flanges without spigot are not included in this part.
The external outline of mounting flanges may be other than circular.

Table A.1
Basic dimensions (mm)
Number Thread and
D22 D20 D23 L20 D21
of fitting screw
D27 D25 D28 L25 D26
holes size
55 70
40 2,5 4 5,8 M5
65 50 80 2,5 4 5,8 M5
75 60 90 2,5 4 5,8 M5
85 70 105 2,5 4 7 M6
100 80 120 3 4 7 M6
115 95 140 3 4 10 M8
130 160
110 3,5. 4 10 M8
165 130 200 3,5 4 12
M10
215 180 250 4 4 14,5
M12
265 230 300 4 4 14,5 M12
300 250 350 5 4 18,5 M16
350 300 400 5 4 18,5 M16
350 450 5 8 18,5 M16
500 450 550 5 M16
8 18,5
550 660 6 8 24 M20
740 680 800 6 8 24 M20
940 880 1000 6 8 28 M24
1080 1000 1150 6 8 28 M24
A.2.2.1.2
Dimensions R 20 and R 25 (fillet radius at the junction of spigot and mounting face on the
flange)
Dimensions R 20 and R 25 are equal to zero, unless otherwise specified in a specific machine
document derived from this annex, or unless otherwise agreed between the manufacturer and the
purchaser.
A.2.2.1.3
Position of holes or threads
The holes or threads are positioned symmetrically to the vertical reference plane, unless other-
wise specified in a specific machine document derived from this annex, or unless otherwise agreed
between the manufacturer and the purchaser.

72-1 © IEC — 39 —
A.3 Shaft extension
A.3.1 Standardized shaft extensions
A.3.1.1 Dimensions for cylindrical shaft extensions with key or without key
NOTE — DOl or D06, LOI or L06 respectively and the centre hole dimensions are selected from ISO/R775.
B01 or B06, HOl or H06 respectively for keys and BOl or B06 for keyways are selected from ISO/R773.
H02 or H07 are calculated from DOl or D06 and H04 or H09: H02 = DOl - H04 or H07 = D06 - H09 respectively.
H04 or H09 are selected from ISO/R773.
a) Basic dimensions for keys and keyways

Table A.2
Dimensions in millimetres
DO1 LO1
With key only
D06 L06
Long Short Key Keyway
series series
BO1 H01 B01 H02
B06 H06 B06 H07
6 16 - - - - -
7 2 2 2 5,8
16 -
3 3 3 6,2
8 20 -
3 3 3 7,2
9 20 -
11 23 20 4 4 4 8,5
14 30 25 5 5 5 11
16 40 28 5 5 5 13
15,5
19 40 28 6 6 6
8 7 8 20
24 50 36
42 8 7 8 24
28 60
32 80 58 10 8 10 27
10 8 10 33
38 80 58
42 110 82 12 8 12 37
48 110 82 14 9 14 42,5
55 110 82 16 10 16 49
60 140 105 18 11 18 53
72-1 © IEC — 41 —
Table A.2 (continued)
Dimensions in millimetres
DO1 LOI
With key only
D06 LO6
Key Keyway
Long Short
series series
BO1 HO1 BO1 H02
B06 H06 B06 H07
65 140 105 18 11
18 58
70 140 105 20
12 20 62,5
75 140 105 20 12
20 67,5
80 170 130 22 14 22
170 130 22 14 22 76
90 170
130 25 14 25 81
95 170 130
25 14 25 86
100 210
165 28 16 28 90
110 210 165 28 16
28 100
120 210 165 32 18
32 109
130 250 200 32 18
32 119
250 200 36 20
36 128
250 200 36 22 36 138
160 300
240 40 22 40 147
170 300
240 40 22 40 157
180 300 240
45 25 45 165
190 350 280 45
25 45 175
200 350 280 45 25
45 185
220 350 280 50 28
50 203
410 330 56 32
56 220
250 410
330 56 32 56 230
260 410
330 56 32 56 240
280 470
380 63 32 63 260
300 470 380
70 36 70 278
320 470 380 70 36
70 298
340 550 450 80 40
80 315
360 550 450 80 40 80 335
380 550 450 80 40 80
400 650
540 90 45 90 372
650 540 90 45 90 392
440 650
540 90 45 90 412
450 650
540 100 50 100 419
460 650 540 100 50
100 429
480 650 540 100 50
100 449
650 540 100 50 100
530 800 680 110 55 110
560 800
680 120 60 120 523
600 800
680 120 60 120 563
630 800
680 130 65 130 590
Application of the table:
1) Length of key: The preferred lengths as stated in
ISO/R773 apply.
2)
Position of key: The key should be positioned entirely within the length of LOl or L06.

72-1 © IEC -
43 -
3) Tolerances proposed for DO1 or D06, B01 or B06 and H02 or H07 respectively are given in
annex C.
b) Dimensions of tapped centre holes

Table A.3
Dimensions in millimetres
Centre hole
DOl
D06
Tapping length
Thread
(tolerance = 0 /+ 2)
> 7 to 10 9
M3
>10to 13 10
M4
> 13 to 16 12,5
M5
>16to 21 16
M6
>21 to 24 19
M8
>24 to 30 22 M10
>30 to 38 28
M12
>
38 to 50 36 M16
>50 to 85
42 M20
> 85 to 130 50 M24
A.4 Inch derived dimensions
This clause may be applied in the development of specific documents covering machines derived
from the inch measurement system.
A.4.1 Machines having H10 < 90 mm
The following values for H10, B10, L10, L11 or L16 respectively and Dll apply:

Table A.4
Dimensions in millimètres
H10 B10 L10
D11
L1
66,7 88,9
42,9 52,4 7,1
76,2 108
69,8 63,5 8,7
76,2 108
120,6 63,5 8,7
88,9 123,8
76,2 69,8 8,7
88,9 123,8 127
69,8 8,7
A.4.2 Machines having H10 >_ 90 mm
A.4.2.1 Dimension H10
The requirements of A.2.1.1 apply.
A.4.2.2 Dimensions B10, L10 and L11 or L16 respectively
Values may be selected from D.2.1.2 or D.2.1.3 and may also be selected from the following
values:
89, 108, 114, 121, 133, 149, 159, 168, 178,
203, 210, 228, 241, 254, 267, 279, 286, 305, 311, 318, 349, 356,
368, 406, 419, 457, 508, 610, 686.

72-1 © IEC — 45 —
Annex B
Reference planes and symbols for mounting dimensions of rotating electrical
machines
Introduction
This annex concerns reference planes and symbols for mounting dimensions of rotating elec-
trical machines and should be considered as a guide for future designs. It has the status of a report
and
does not replace nor interfere with IEC 72-1 and 72-2 which apply within the strict limits of
their scopes.
General requirements on tolerances and limit values of these dimensions are given in annex C.
A guide for selecting these dimensions is given in annex A.
B.1 Scope
This report applies to all rotating electrical machines, except those covered by the following
publications:
— IEC 349: 1971, Rules for rotating electrical machines for rail and road vehicles.
— IEC 335, Safety of household and similar electrical appliances.
B.2 Definition of terms
For the definitions of all general terms used in the present report, refer to IEC 50 (411).
For the definitions of the drive end (D-end) and of the non-drive end (N-end) of the machine,
refer to IEC 34-8.
In the following text, the terms D-end and N-end will only be used.
For the purpose of this report, the following definitions are used:
B.2.1 Mounting dimensions
The term mounting dimensions shall be understood as all the dimensions needed to arrange for:
—
mechanical connection, for example, the connexions to the driving or the driven machine, to the
associated equipment, to the cooling ducts or pipes, etc.;
— electrical connections, e.g. the connections to the supply, to the associated equipment, etc.;
— the installation of the machine, which involves:
the space required (overall dimensions);
the fixing dimensions; e.g. distance between footholes;
the location of the lifting eyes.

72-1 ©IEC — 47 —
B.2.2 Overall dimension
An overall dimension is a dimension defining:
— either the distance between two plances parallel to one of the reference planes (see clause B.3)
and containing the outer (and only the outer) points of the machine;
— or the diameter of the cylinder parallel to the shaft axis of the machine and containing the outer
(and only the outer) points of the machine.
NOTE — Where clearan ces between the nearest objects in the vicinity of the machine and the outer points of the latter
are critical, such clearances should be taken into account and whenever necessary be included in the overall dimensions.
B.2.3
One-sided overall dimension
A one-sided overall dimension is a dimension defining:
— either the distance between a reference plane (see clause B.3) and a plane parallel to it and
containing the outer (and only the outer) points of the machine.
— or the distance between the shaft axis and the outer (and only the outer) points of the machine.
B.3 Definition of the reference planes
The mounting arrangement of the machine - i.e. the position of the shaft axis either ho rizontal or
vertical - has no influence on the definitions and the designations of the reference planes.
B.3.1 Machines having one or several mounting surfaces nominally parallel to the axis of the machine and
also parallel to one another in the case of several mounting surfaces
Figure B.1 shows a foot-mounted machine with feet down having one mounting surface.
B.3.1.1
Horizontal reference plane
The plane which contains that mounting surface which is farthest from the shaft axis of the
machine.
B.3.1.2 Vertical reference plane
The plane which contains the shaft axis of the machine and is perpendicular to the horizontal
reference plane.
B.3.1.3 Longitudinal reference plane
The plane perpendicular to both planes defined in B.3.1.1 and B.3.1.2 and which
a) either contains the shoulder ofthe shaft extension at the D-end or the equivalent position ifthere
is no shoulder (see note 2); or
b) is located by special agreement, if there is no shaft extension.
NOTES
1 In case of a second shaft extension the longitudinal reference plane for some dimensions is located at this second
shaft extension: i.e. the N-end.
2 Figure B.3 shows examples of shaft extensions at the D-end and location of the longitudinal reference plane with
and without a shaft extension shoulder.
3 The longitudinal reference plane is taken as the mid-position ofthe mechanical axial play possible or necessary for the
satisfactory operation of the machine, this play being determined when cold.

— 49 —
72-1 ©IEC
Machines not covered by B.3.1
B.3.2
Figure B.2 shows a flange-mounted machine having one mounting flange at the D-end.
are two planes perpendicular to each other such that
B.3.2.1 The horizontal and vertical reference planes
the intersection is coincident with the shaft axis of the machine, the vertical reference plane being
defined by a further reference, chosen in the following order:
the middle in between two adjacent fixing holes in the flange or a mounting device;
a)
some other significant feature of the machine.
b)
is the plane perpendicular to both planes defined under B.3.2.1
B.3.2.2 The longitudinal reference plane
and which:
either contains the shoulder of the shaft extension at the D-end or the equivalent position if there
a)
is no shoulder (see B.3.1.3 note 2); or
is located by special agreement, if there is no shaft extension.
b)
B.4 Symbol structure
The symbols consist of a capital letter followed by two character numerals fixed in accordance
with the instructions in clauses B.5 and B.6. For cases not covered by clauses B.5 and B.6, the
instructions of clause B.8 shall apply.
B.5 Rules for the allocation of characteristic letters for the symbols
B.5.1 The following capital letters shall be used in the symbol:
A for angles,
B for breadths (widths),
D for diameters,
H for heights,
L for lengths,
N for "number of" (e.g. for number of holes),
R for radii.
B.5.2 Dimensions B are those in the direction perpendicular to the vertical reference plane.
B.5.3 Dimensions L are those in the direction perpendicular to the longitudinal reference plane.
B.5.4 Dimensions H are those in the direction perpendicular to the horizontal reference plane.

72-1 ©IEC — 51 —
B.5.5 For dimensions related to parts mounted on the machine at a given angle (e.g. terminal box, addi-
tional equipments), the same B, H and L characteristic letters are used, but in this case, dimensions
B, H and L may be those along the axis of these parts as indicated below:
—
Letter H is applied to the dimensions in the direction nearest to the direction perpendicular to the
surface of the machine at the location of the said equipment (see figure B.5).
—
Letter L is applied to the dimensions in the direction of that of the other two directions which is
nearest to the direction perpendicular to the shaft axis of the machine.
— Letter B is applied to the dimensions in the direction perpendicular to the other two (see
figure B.5).
B.6 Rules for the allocation of characteristic numerals for the symbols
B.6.1 The rules adopted for the allocation of characteristic numerals are given in table B.1. Additional
indications are given below.
B.6.2 Symbols for mounting flanges apply for all kinds of flange, irrespective of the shape, size and loca-
tion of that flange (e.g. flange on endshield, flange on frame, etc.).
B.6.3 If a
reference plane contains an outer surface of the machine so that overall dimensions specified
with respect to it are not one-sided but side-to-side dimensions, symbols referring to overall dimen-
sions shall be used, i.e. with 9 as the first characteristic numeral.
B.6.4 One-sided overall dimensions B, H, L and R are designated by the first characteristic numeral 7
or 8.
B.6.4.1
One-sided overall dimensions designated by numeral 7
— Overall dimensions B and R are to the left, when looking at the D-end.
— Overall dimensions H are upwards to the top.
—
Overall dimensions L are in the direction towards the D-end.
B.6.4.2 One-sided overall dimensions designated by numeral 8
Dimensions B, H, L and R are in directions opposite to those designated to the numeral 7.
NOTE — When choosing the numeral 7 or 8 of dimensions B, H, L and R, the directions used in the drawings have to be
considered. By doing so, it is assumed that dimensions H are shown in the drawings in a vertical direction and that the
bottom of the machine is positioned at the bottom of the appropriate projections of the drawing.
If this is not the case, the direction "to the left"
and "upwards" are defined according either to the actual location of the
bottom point or the conventionally chosen bottom point on the H axis.
For foot-mounted machines, when establishing the position of this point, the machine should be assumed to have its
feet downwards irrespective of its actual mounting arrangement.
B.6.5 Dimensions R are used to designate distances located along directions which differ from those of
dimensions B and H.
B.6.6 The allocation of the second characteristic numeral to designate overall dimensions marked with
the first characteristic numeral 7, 8 or 9 is made in accordance with table B.2.

72-1 © IEC — 53 —
B.6.7 Minimum clearances (between outer points of the machine and the nearest objects or walls)
necessary for the mounting and maintenance of the machine (e.g. for removing housings, opening
Iids, turning control handles, etc.) or for its normal operation (e.g. for free inlet and outlet of cooling
air) are expressed by the difference of a one-sided overall dimension inclusing said clearances
(second characterist
...