Paul:
If I go to a grounded surface why would I have to run an extension cord? For example, a radiator ? A Basin ? Most of these older homes have copper or galvanised pipe for waterlines.
As I said to Don, the original question was to test these devices without pushing the test button, all I am saying is,"Hey here is another way to do it".
The internals of a gfci is basically an op-amp, and a 'Wiggy' will create enough imbalance to trip it.
I have done this numerous times and it works
Mark
