Does the breaker in an single phase AC system need to be 2 pole? I'm reading in Transport Canada TP 127 that "Each branch circuit operating at voltages of 55 volts or over shall be provided with a switch or circuit breaker with a pole for each conductor" and the breakers they have at my local Chandler is a Blue Sea #7210 which "Meets American Boat and Yacht Council (ABYC) standards" but it is a single pole. Does anyone use dual pole breakers for AC?