Putting in a new garage sub panel, but none of the wires pulled to the garage were marked. There are three #8 wires, 2 hot and a neutral. The hots are on a 2 pole breaker. If I turn the breaker on and test for voltage, the neutral should not be hot. My question is, can I remove one of the wires from the 2 pole breaker, turn it back on, and then identify the hot wire as A or B phase?