I'm going to be setting up shop of sorts in a commercial space with some dodgy electrical service that's been tinkered with over the years. It has
208 volt 3 phase, which I wish to extend into my space.There should be a A, B and C legs, but how is this order determined by testing? I've not seen any electricians carry around an oscilloscope, so there has to be an simpler way. Grab a small 3 phase motor and put alligator clips on it and fuss around until it spins in the right direction?