Had an electrical issue arise with a hot/ground reversal indicating on my little Ideal Tester. Was getting a shock touching my microphone ground, my freezer, the wall plate screws on lit switches etc. I know this place is wired correctly( I did the entire job myself, with electrician making the connections) and there are no incorrectly polarized outlets or junctions, it was inspected by the electric company inspector ( a real thorough no BS guy)and the whole place has functioned fine for five years. I narrowed it down to a " surge protected multi strip" that had an MOV shorted inside it. I took it apart and cut out the three MOVs that were in it, checked the wiring to male sure it was correct amd reassembled......problem solved! If you ever start getting a shock off an appliance or other supposedly grounded surface, check all your multi plug strips FIRST!, especially if they are surge protected types.