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<< Don't even think of playing with the power grid, even with one hand in your pocket. Alan >> right arm! Alan. Some real sense of the questioner's dilemma. 1st) The reversed polarity outlets are a likely place to get a shock with your gear. So, get those fixed TODAY. 2nd) The 3-prong outlets need checked to see if there is a ground wire connected to the ground terminal of the receptacle or not. If not, get that fixed. 3rd) Knob & Tube was and is good safe wiring. Problems occur, however, when modern 3-wire conductors and old knob & tube (2-wire) are mixed on the same circuit(s). The floating neutral of the old stuff can become severely overloaded--a fire hazard. 4th) The highest voltage I ever worked was 34,500 volts distribution power. Perfectly safe if all the precautions are taken and the right gear is used. 5th) The only time I nearly got electrocuted was when assembling the buss bars inside a large 440v. 3-phase switchgear cabinet (about the size of a normal bedroom). I had my safety padlock on the main, but a young electrical engineer decided he needed to show a group of state senators how the facility looked. He wanted to turn on some overhead lights. (Engineers had master keys for everything in those days.) He didn't check with anyone, he just unlocked my padlock and turned it all on. Well I was sweating (July in Iowa) just pushing a 90 pound solid slab of copper buss in place when the power came on. I was absolutely locked up and could not move, I couldn't even take a breath and my heart was stopped completely, since the 440 volts was going from arm-to-arm for almost a full minute. Finally, an apprentice I was working with, ran up and turned it off when he realized what was happening. He punched out the EE too later, I heard! Good lad. I had minor burns on both arms where they were touching the buss bars. I felt very strange for several days. But, I got six months off with pay and the young EE got fired! And no one could ever unlock anybody else's safety lock after that. At least at that facility. 6th) The problem with 120 volts is that usually doesn't have enough strength to stop your heart, just enough to cause erractic fibrillations which will kill you in 5 minutes or so. A heart de-fibrillator like medics use operates on between 300 and 500 volts, I believe. But a dead short circuit on even a 120 volt 20 amp circuit has about the same amount of available power as a locomotive engine going 60 miles an hour--if only for a fraction of a second. I don't know about you, but I wouldn't want to get hit by such a thing (again), even if it was only for a few microseconds. Bill "Hawkeye"