Product Manual

Physical and Environmental Consideration
Usual Service Conditions
Motor ratings apply to motors operating under usual service conditions.
NEMA and EEMAC (Electrical Equipment Manufacturers Association of
Canada) standards specify usual environmental conditions as:
1. Exposure to an ambient temperature in the range of 0º to 40ºC or
when water cooling is used, in the range of 10º to 40ºC.
2. Exposure to an altitude which does not exceed 3300 feet (1000
meters) (see MG1-14.04)
3. Installation on a rigid mounting surface
4. Installation in areas or supplementary enclosures which do not
seriously interfere with the ventilation of the machine
Unusual Service Conditions
The manufacturer should be consulted if the motor is to be operated in
unusual service conditions.
NEMA and EEMAC standards also specify typical unusual service
conditions.
1) Exposure to:
• Combustible, explosive, abrasive or conducting dusts
• Lint or very dirty operating conditions where the accumulation of
dirt may interfere with normal ventilation
• Chemical fumes, flammable or explosive gases
• Nuclear radiation
• Steam, salt-laden air, or oil vapor
• Damp or very dry locations, radiant heat, vermin infestation, or
atmospheres conductive to the growth of fungus
• Abnormal shock, vibration, or mechanical loading from external
sources
• Abnormal axial or side thrust imposed on the motor shaft
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