Did some wet diamond grinding with my electric angle grinder (double
insulated) on a concrete walkway in the backyard. Felt a tingle on my hand
but the GFCI outlet didn't trip, must be too low of a fault current.
If you felt it then you may have bad or mis-wired GFCI.
Note that if the path of current is from hot wire -through you- and then
back to the neutral wire, (not ground) then you will be shocked all day
long.. until the cows come home..... The GFCI does not know you from a
light bulb or any other load.
The GFCI is suspose to trip at 5 ma. Most people can feel currents as small
as 1 or 2 ma. The test button is set for about 8 ma. Incase you don't hae
a point of refferance, a 100 watt light bulb will need about 1 amp of
current to light. A ma is .001 of an amp. Up to about 10 ma on the outside
of the skin is usually safe but it might start being painful. Get up to 50
to 100 ma and you could die. Those are very rough numbers.
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