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 ...

A 200-amp breaker is appropriate for a home upwards of 2000 square feet. Smaller buildings can use 150-amp or 100-amp; small homes and subpanels can use as little as 50-amp. Double-pole breaker ...