scope:

This part of IEC 60034 specifies efficiency classes for single-speed, three-phase, 50 Hz and 60 Hz, cage-induction motors that:

• have a rated voltage UN up to 1 000 V;

NOTE The standard also applies to motors rated for two or more voltages and/or frequencies.

• have a rated output PN between 0,75 kW and 375 kW;

• have either 2, 4 or 6 poles;

• are rated on the basis of either duty type S1 (continuous duty) or S3 (intermittent periodic duty) with a rated cyclic duration factor of 80 % or higher;

• are capable of operating direct on-line;

• are rated for operating conditions in accordance with IEC 60034-1, Clause 6.

Motors with flanges, feet and/or shafts with mechanical dimensions different from IEC 60072-1 are covered by this standard.

Geared motors and brake motors are covered by this standard although special shafts and flanges may be used in such motors.

Excluded are:

• Motors made solely for converter operation in accordance with IEC 60034-25.

• Motors completely integrated into a machine (for example pump, fan and compressor) that cannot be tested separately from the machine.