Revised Standard from Last Update.

1. SCOPE

This standard specifies the dimensions for foot-mounted three-phase 50 Hz a.c. induction motors of shaft height ranging from 56 to 315 mm, intended for general purpose applications. This standard also specifies the standard nominal output for squirrel-cage induction motors having enclosures for type of protection IP 21, IP 22 and IP 44 or superior (see IS/IEC 60034-5) for different frame sizes on the basis of Class ‘B’ insulation or higher class insulation (see IS 1271) and continuous rating in accordance with IS 15999 (Part 1).

It also covers the standard outputs and corresponding frame sizes and shaft extension diameters for slip-ring (wound rotors) continuous S1 duty rated motors, of shaft height ranging from 160 to 315 mm, for class of insulation not lower than Class ‘B’ (see IS 1271) and having enclosures for type of protection IP 21, IP 22 and IP 44 or superior (see IS/IEC 60034-5) for supply voltage not exceeding 1 000 volts.

2. REFERENCES

The standards listed in Annex A contain provisions which, through reference in this text, constitute

provisions of this standard. At the time of publication, the editions indicated were valid. All standards are

subject to revision, and parties to agreements based on this standard are encouraged to investigate the

possibility of applying the most recent editions of the standards listed in Annex A.