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Page 1

IS 12615 : 2011

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Indian Standard
ENERGY EFFICIENT INDUCTION MOTORS —

THREE PHASE SQUIRREL CAGE
( Second Revision )

ICS 29.160.30

© BIS 2011

August 2011 Price Group 4

B U R E A U O F I N D I A N S T A N D A R D S
MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

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Rotating Machinery Sectional Committee, ETD 15

FOREWORD

This Indian Standard (Second Revision) was adopted by the Bureau of Indian Standards, after the draft
finalized by the Rotating Machinery Sectional Committee had been approved by the Electrotechnical Division
Council.

This standard specifies the performance requirements and efficiency of three phase squirrel cage energy
efficient induction motors.

This standard was first published in 1989 and revised in 2004 to include two types of energy efficiency
values. This revision has been contemplated to bring it line with IEC 60034-30 : 2008 ‘Rotating electrical
machines — Part 30: Efficiency classes of single-speed, three-phase, cage-induction motors’, to the extent
possible for efficiency classes of 3 phase squirrel cage induction motors referring to related standard
IS 15999 (Part 2/Sec 1) : 2011/IEC 60034-2-1 : 2007* ‘Rotating electrical machines — Part 2-1: Standard methods
for determining losses and efficiency from tests (excluding machines for traction vehicles)’ on the methods of
testing. Hence a need was felt to harmonize standard with the international practices to the extent possible.

Electric motors are the most important type of electric load in every industry. The motor driven systems
account for about seventy percent of the energy consumed by the industry. There is a large potential for cost
effective solution in the use of energy efficient motor systems by about twenty to thirty percent. Electric
motor systems include a number of energy using products, such as motors, drives, pumps or fans, compressors,
blowers and other machines. Energy efficient motors form a major component in contributing to the energy
saving by way of increased efficiency of the product itself. Therefore, attempts are being made globally to
develop and implement standards specifying higher efficiencies of motors and removal of lower efficiency
from the standards itself. Further, with the different test methods specified in different standards, one to one
comparison becomes difficult for the buyer or the end user. Therefore a need was felt globally to harmonize
the motor standards with the international standards so as to have uniform test procedures to facilitate the
end user to compare the performance and energy efficiency requirements.

Acknowledging the need for energy saving in view of the energy scarcity, climate change mitigations and the
potential that exists with energy efficient motors, number of countries have issued directives to withdraw
lower efficiency classes and adopt higher efficiency class motors as per IEC 60034-30 thus defining minimum
efficiency performance standards (MEPS) in their countries. Such regulations are expected to impose technical
barriers to all the imports of motors which are with lower efficiency classes than the MEPS in to their countries.
Keeping in view the threats to the exports to India and also complimenting the role of various Government
initiatives like National Mission for Energy Efficiency, it is intended that the efficiency levels of the motors
covered in this standard need to be upgraded in a phased manner as per the below schedule:

a) The second revision shall be implemented by 30 June 2011.
b) The efficiency performance values of the motors under the scope shall be IE2. However, when these

motors are used with variable frequency drives, they shall conform to IE1 values of efficiency.
c) The efficiency performance values of the motors under the scope shall be IE3 and shall be effective by

31 January 2014. However, when these motors are used with variable frequency drives, they shall
conform to IE2 values of efficiency.

It has to be noted that the time lines for mandatory regulations imposed in different countries to set
minimum efficiency performance standards (MEPS) for general purpose motors covered under the scope of
IEC 60034-30 are not far after the global harmonization of standards. Needless to say, in most of the countries,
the MEPS of IE1 are already in place. With the new regulations, after June 2011, most of the major motor
markets will be facing the MEPS of IE2. Hence, this standard proposes to specify IE1 motors only when used
with variable frequency drives.

(Continued on third cover)*Under print.

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IS 12615 : 2011

4

shall be as given in 8.6 of IS/IEC 60034-1 and 5.7 of
IS 15999 (Part 2/Sec 1).

19.3 No Load Test at Rated Voltage to Determine
Input Current, Power and Speed

The tests shall be carried out as given in IS 15999
(Part 2/Sec 1) and 9.1 of IS/IEC 60034-1.

19.4 Reduced Voltage Running up Test at No Load
(for Squirrel Cage Motors Up to 37 kW Only)

The tests shall be carried out as given in
IS 15999 (Part 2/Sec 1).

19.5 Locked Rotor Readings of Voltage, Current,
Power Input and Torque at a Suitable Reduce Voltage

The tests shall be carried out as given in
IS 15999 (Part 2/Sec 1).

19.6 Full Load Test to Determine Efficiency, Power
Factor and Slip

The tests shall be carried out as given in
IS 15999 (Part 2/Sec 1).

19.7 Temperature Rise Test

The method of measurement and the requirement
shall be as given in 8 of IS/IEC 60034-1.

19.8 Momentary Overload Test

The tests shall be carried out as given in
IS 15999 (Part 2/Sec 1).

19.9 Insulation Resistance Test

The tests shall be carried out as given IS 7816.

19.10 High Voltage Test

The tests shall be carried out as given in 9.2 of
IS/IEC 60034-1.

19.11 Test for Vibration Severity of Motor

The tests shall be carried out as given in IS 12075.

19.12 Test for Noise Levels of Motor

The tests shall be carried out as given in IS 12065.

19.13 Test for Degree of Protection by Enclosure

The tests shall be carried out as given in
IS/IEC 60034-5.

19.14 Temperature Rise Test at Limiting Values of
Voltage and Frequency Variation

The tests shall be carried out as given in 8 of
IS/IEC 60034-1.

19.15 Over Speed Test

The tests shall be carried out as given in 9.7 of
IS/IEC 60034-1.

19.16 Test on Insulation System

19.16.1 Tangent Delta and Delta Tangent Delta Test

The requirements and method of test shall be as per
IS 13508.

19.16.2 Impulse Voltage Withstand Test

The requirements and method of test should be as
per IS 14222.

20 TEST CERTIFICATES

20.1 Unless otherwise specified, the purchaser shall
accept manufacturer’s certificate as evidence of
compliance of the motor with the requirements of
this standard together with a type test certificate on
a motor identical in essential details with the one
purchased, together with routine tests on each
individual motor.

20.2 Certificate of routine tests shall show that the
motor purchased has been run and has been found
to be electrically and mechanically sound.

21 SCHEDULE OF TESTS

21.1 Type Tests

The following shall constitute type tests:

a) Dimensions;
b) Measurement of resistance of windings of

stator;
c) No load test at rated voltage to determine input

current power and speed;
d) Reduced voltage running up test at no load

(for squirrel cage motors up to 37 kW only);
e) Locked rotor readings of voltage, current,

power input and torque at a suitable reduce
voltage;

f) Full load test to determine efficiency, power
factor and slip;

g) Temperature rise test;
h) Momentary overload test;
j) Insulation resistance test; and
k) High voltage test.

21.2 Optional Tests

The optional tests shall be carried out as per the
mutual agreement between the manufacturer and the
purchaser.

a) Test for vibration severity of motor;
b) Test for noise levels of motor;

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IS 12615 : 2011

5

c) Test for degree of protection by enclosure;
d) Temperature rise test at limiting values of

voltage and frequency variation;
e) Over speed test; and
f) Test on insulation system.

21.3 Routine Tests

The following shall constitute the routine tests:

a) Insulation resistance test;

Sl Rated Frame Full Load Full Load Breakaway Breakaway Current in Nominal Efficiency
No. Output Size Speed Current Torque Terms of Full Load Current

in Terms (Equal of Below)
of Full Load
Torque IE1 IE2 IE3 IE1 IE2 IE3

Min Max Min

kW Rev/min A Percent Percent Percent Percent Percent Percent Percent

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12)

i) 0.37 71 2 750 1.2 170 600 650 700 66.1 72.2 75.5
ii) 0.55 71 2 760 1.6 170 600 650 700 69.1 74.8 78.1

iii) 0.75 80 2 780 2.0 170 600 650 700 72.1 77.4 80.7
iv) 1.1 80 2 790 2.8 170 600 650 700 75.0 79.6 82.7
v) 1.5 90S 2 800 3.7 170 600 650 700 77.2 81.3 84.2

vi) 2.2 90L 2 810 5.0 170 650 700 770 79.7 83.2 85.9
vii) 3.7 100L 2 820 8.0 160 650 700 770 82.7 85.5 87.8

viii) 5.5 132S 2 830 11.0 160 650 700 770 84.7 87.0 89.2
ix) 7.5 132S 2 840 15.0 160 650 700 770 86.0 88.1 90.1
x) 11.0 160M 2 860 21.5 160 650 700 770 87.6 89.4 91.2

xi) 15.0 160M 2 870 29.0 160 650 700 770 88.7 90.3 91.9
xii) 18.5 160L 2 880 35.0 160 650 700 770 89.3 90.9 92.4

xiii) 22.0 180M 2 890 41.5 160 650 700 770 89.9 91.3 92.7
xiv) 30.0 200L 2 900 54.0 160 650 700 770 90.7 92.0 93.3
xv) 37.0 200L 2 900 67.0 160 650 700 770 91.2 92.5 93.7

xvi) 45.0 225M 2 955 80.0 160 650 700 770 91.7 92.9 94.0
xvii) 55.0 250M 2 960 95.0 160 650 700 770 92.1 93.2 94.3

xviii) 75.0 280S 2 970 130.0 160 650 700 770 92.7 93.8 94.7
xix) 90.0 280M 2 970 150.0 160 650 700 770 93.0 94.1 95.0
xx) 110.0 315S 2 980 185.0 160 650 700 770 93.3 94.3 95.2

xxi) 125.0 315M 2 980 209.0 160 650 700 770 93.4 94.5 95.3
xxii) 132.0 315M1) 2 980 220.0 160 650 700 770 93.5 94.6 95.4

xxiii) 160.0 315L1) 2 980 265.0 160 650 700 770 93.8 94.8 95.6
xxiv) 200.0 As per 2 980 340.0 160 650 700 770 94.0 95.0 95.8

manufacturer
catalogue

xxv) 250.0 2 980 425.0 160 650 700 770 94.0 95.0 95.8
xxvi) 315.0 2 980 536.0 160 650 700 770 94.0 95.0 95.8

xxvii) 355.0 2 980 604.0 160 650 700 770 94.0 95.0 95.8
xxviii) 375.0 2 980 604.0 160 650 700 770 94.0 95.0 95.8

Table 1 Values of Performance Characteristics of 2 Pole Energy Efficient Induction Motors
(Clauses 1.2, 1.3, 4.3, 8, 14.1, 14.4 and 17.1)

NOTES
1 Output to frame size relation is maintained in accordance with IS 1231 for all motors except those marked as 1), wherein the
frame size indicated is ‘preferred size’.
2 The performance values given in this table for 0.37 kW and 0.55 kW are under consideration and subject to review.

b) Measurement of resistance of windings of
stator;

c) No load test;
d) Locked rotor readings of voltage, current and

power input at a suitable reduced voltage;
e) Reduced voltage running up test; and
f) High voltage test.

Page 11

This standard is based on IEC 60034-30 : 2008 issued by the International Electrotechnical Commission except
that additional performance parameters other than efficiency values have also been included which are as
follows:

a) Performance requirements have been incorporated;
b) Breakaway torque;
c) Breakaway current;
d) Full load speed;
e) Full load current;
f) Frame size designation; and
g) Schedule of tests.

For the purpose of deciding whether a particular requirement of this standard is complied with, the final value,
observed or calculated expressing the result of a test or analysis, shall be rounded off in accordance with
IS 2 : 1960 ‘Rules for rounding off numerical values (revised)’. The number of significant places retained in
the rounded off value should be the same as that of the specified value in this standard.

(Continued from second cover)

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Bureau of Indian Standards

BIS is a statutory institution established under the Bureau of Indian Standards Act, 1986 to promote harmonious
development of the activities of standardization, marking and quality certification of goods and attending to
connected matters in the country.

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the prior permission in writing of BIS. This does not preclude the free use, in course of implementing the standard,
of necessary details, such as symbols and sizes, type or grade designations. Enquiries relating to copyright be
addressed to the Director (Publications), BIS.

Review of Indian Standards

Amendments are issued to standards as the need arises on the basis of comments. Standards are also reviewed
periodically; a standard along with amendments is reaffirmed when such review indicates that no changes are
needed; if the review indicates that changes are needed, it is taken up for revision. Users of Indian Standards
should ascertain that they are in possession of the latest amendments or edition by referring to the latest issue of
‘BIS Catalogue’ and ‘Standards: Monthly Additions’.

This Indian Standard has been developed from Doc No.: ETD 15 (6291).

Amendments Issued Since Publication
______________________________________________________________________________________

Amendment No. Date of Issue Text Affected
______________________________________________________________________________________

______________________________________________________________________________________

______________________________________________________________________________________

______________________________________________________________________________________

______________________________________________________________________________________

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