Originally Posted by
Tim Moreira
I know that GFCIs are required in crawl spaces but...if motors are attached won't they trip?
Nope.
Old equipment, maybe, but that is really telling you that the old equipment needs to be replaced.
For newer equipment, the level of ground fault leakage permissible for the equipment to be listed and labeled is 0.05 ma. Remember, a GFCI trips at 5 ma. That means the equipment would need to have ground fault leakage of 100 times its allowable limit before it trips a GFCI.
If the equipment ground fault current it that high, you WANT IT TO TRIP the GFCI.