Thanks Texas ranger I'm guessing that with a combination of a slow ish fuse a high impedance supply you can put a dead short on the mains and it will not blow the fuse I've never come across this situation in real life but I'm guessing if you have a loop impedance of 2 ohms a supply of 220 volts that's 110 amps and a 60 amp fuse you'd get away with it although I thing anyone else on the same phase is going to be a bit annoyed with you
