Tandem Breakers Demystified: Expanding Circuit Options

Tandem Breakers for a Full Breaker Panel two breakers in one slot The spaces of a QO load center interior that WILL accept QOT type tandem circuit breakers can be identified by rectangular 'slots'(of two slot The two Breakers in one space are exactly what it says on the tin They are separate Breakers with separate trip I have never seen double stuff

two breakers in one slot a single tandem breaker That breaker slots or even replace two single slot breakers with a tandem breaker