Two-pole breakers can be either slash or straight voltage-rated, whereas 3-pole breakers are all straight voltage-rated. Temperature Rating [Sec. 110.14(C)]. You must size conductors to the lowest ...

A tandem circuit breaker, also known as a double pole circuit breaker, takes up the space of a single circuit breaker on a Square D panelboard. By hominspector. February 28, 2012 at 11:46AM.