Posted by Geo-TH,In on June 12, 2016 at 09:47:35 from (172.78.45.175):
In Reply to: GFCI on generator posted by Russ from MN on June 12, 2016 at 08:59:55:
Russ from MN,
I've never tried this, but may someday. CFCI's are very sensitive to detecting current difference between the power and neutral so small, in the ma range, that we can't even feel it. To prove my point you can use a small power supply, connect a dc ma meter in series, completing the circuit hold the two wires with your right hand, which won't allow current to pass through your heart. Crank up the voltage slowly. You will notice what the threshold current is for you body to detect it. Usually it a few ma. At 10 ma is considered the threshold of pain. Trust me, you will let go before it get to 10 ma. 50-100 ma is considered deadly. Deadly means that it kills half the time. However I think the current needs to pass through your heart. I'm not about to find out. You can try it and post back if you live.
That said, do an experiment and see if putting a wire in either side of the CFCI on your generator will trip when you touch the other side to ground. Good idea if you use insulated gloves and wire. I'm guessing it won't because your generator is isolated form ground. If it did, then there is some current leaking through the insulation of your generator, or there is a little capacitive reaction at play.
I have no clue why OSHA wants you to ground a generator unless it has something to do with lightning. But then what do I know. This information is worth exactly what you are paying for it. geo.
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