Tandem breakers don't sit flush in panel -

No Room In Electrical Panel - Quick Fix two breakers in one slot one slot chording From bar one the conductor goes to the top of slot one , than to bottom of slot four and then to bar two breakers similar to those two slot Single-pole breakers are thinner and have a single switch for onoff positions A double-pole

two breakers in one slot Because tandem circuit breakers allow for two circuits to be installed on a panelboard in a one circuit breaker space, they're typically