Stationary motor frame grounding

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DEW202001

DEW202001

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ODENTON, MD
Stupid question. I have 4 stationary blower motors. 60HP each. Each frame of the motor is grounded back to a ground loop around the BLDG. Can a ground/bond each of the 4 motor frames together and the bring it to the ground loop? Or should it be done separately? Any feed back would be great.


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DEW202001 said:
Stupid question. I have 4 stationary blower motors. 60HP each. Each frame of the motor is grounded back to a ground loop around the BLDG. Can a ground/bond each of the 4 motor frames together and the bring it to the ground loop? Or should it be done separately? Any feed back would be great.


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I don't think that in general there is a code requirement to run a conductor to earth at all. This seems like something that has been spec'd and if so should be asked of whomever issued the spec.
 
DEW202001 said:
Yes. Spec calls for all motor over 50HP to be taken to the ground loop.


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since it is not a code issue I think the only thing you can do is ask the entity that issued the spec. I can't think of a good reason to be doing this but if that entity wants to pay for it, let them.

I have had specs where it said every enclosure had to have a 2/0 lug in it for grounding. I had the shop put them in, even in 6X4 junction boxes and charged accordingly.
 
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