IS 14377 : 1996 Specification for Three-phase Induction Motors for Fans Used in Air-conditioning and Ventilation

1 Scope

1.1 This standard covers three-phase squirrel cage inductionmotors for driving fans for ventilation, air-conditioning andcommercial heating for voltages up to and including 11 000 V andhaving windings with Class E, Class B and Class F insulation (seeIS 1271 : 1985).

1.2 This standard does not cover induction motors for induceddraught fans.

1.3 Motors for use on systems employing non-preferred voltageand frequency (see 9) shall be considered as complying with thisstandard provided that these comply in all respects. The voltageand frequency for which they are designed shall be indicated on therating plate of the motor.

2 References

List of Referred Indian Standards

IS 325 :1995Three-phase induction motors

IS 996 :1979Single-phase small ac and universal electricmotors

IS 1231 :1974Dimensions of three-phase foot-mountedinduction motors

IS 1271 :1985Thermal evaluation and classification ofelectrical insulation

IS 1885 : Part 35 :1993 Electrotechnical vocabulary:Part 35 Rotating machinery

IS 2223 :1983Dimensions of flange mounted ac inductionmotors

IS 2540 :1963Dimensions for threaded centre holes

IS 3043 :1987Code of practice for earthing

IS 4029 :1967Guide for testing three-phase induction motors

IS 4691 :1985Degrees of protection provided by enclosurefor rotating electrical machinery

IS 4728 :1975Terminal marking and direction of rotating forrotating electrical machinery

IS 6362 :1971Designation of methods of cooling of rotatingelectrical machines

IS 12075 :1987Mechanical vibration of rotating electricalmachines with shaft heights 56 mm and highermeasurement, evaluation and limits ofvibration severity (superseding IS 4729 : 1968)

IS 12360 :1988Voltage bands for electrical installationsincluding preferred voltages and frequency(superseding IS 585)

IS 12824 :1989Type of duty and classes of rating assigned torotating electrical machines