The standard 3 prong polarity checking/GFCI testers will not trip a GFCI on a 2 wire circuit.
My understanding is that they try to divert some small amount of current to the Grounding conductor thereby tripping the GFCI. This doesn't work without a continuous ground path. (no ground wire)
My 'Wiggy' will trip a GFCI if tester is positioned between the 'hot' and any nearby grounded object.
My thoughts were if there was some easy way to recommend testing GFCI operation under these circumstances (2 wires) - or a better tester. There seems to be a lot of people that do not realize that the plug-in testers won't work and they think something is wrong with the GFCI or wiring. They are concerned that the GFCI will not trip because they cannot verify it with their tester.
Bill
