Sump pump rules in manufacturing facility?

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milemaker13

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Suburbs of Chicago
Actually, the pump is on a GFCI receptical. The issue that was brought up was about the wiring going to the GFCI receptical. It is in ridgid conduit in a floor trench.

They are afraid the trench cover plates could become energized even if the GFCI trips.
 
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milemaker13 said:
Actually, the pump is on a GFCI receptical. The issue that was brought up was about the wiring going to the GFCI receptical. It is in ridgid conduit in a floor trench.

They are afraid the trench cover plates could become energized even if the GFCI trips.
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If the wiring is in rigid metal conduit, how could the cover plates become energized?
 
milemaker13 said:
Yeah, I dunno. Its hard to keep up with the stuff office people dream up.
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I know what you mean.

If there were 120V wires just laying in the trench, then I would say the trench would need to be a UL listed wireway, and the cover would have to be grounded.

Even with the Rigid conduit, I guess someone might say the cover could be considered "likely to be energized" per the NEC. That would mean the cover needs to be grounded. But on most trenches I've seen, the covers are grounded by their means of attachment. (ie. the cover is screwed down to the metal trench frame, which is embeded in grounded concrete, and also grounded by all the metal conduit that it supports.)
 
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