Group A through Group D are related to gasses. If Group C motors are designed more stringent (tighter tolerances)than Group D motors is it safe to assume that a Group C rated motor can be used in a Group D environment? If so then why do motor manufactures sell motors with combined ratings of both Group C & D? Is this for clarification purposes or must the motor actually be rated for each group?
Group Designation - Motor Rating
- Thread starter bobhudon
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- Mission Viejo, CA
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- Professional Electrical Engineer
Re: Group Designation - Motor Rating
The basic marking rule is found in 500.8(B). Motors installed in Class I, Division 2 locations under 501.125(B) of the 2005 NEC generally fall under 500.8(B) Exception No. 3.
So, motors requiring identification (Division 1) must be marked for each applicable Group.
The basic marking rule is found in 500.8(B). Motors installed in Class I, Division 2 locations under 501.125(B) of the 2005 NEC generally fall under 500.8(B) Exception No. 3.
So, motors requiring identification (Division 1) must be marked for each applicable Group.
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