Add Sub Panel in Garage

Add Sub Panel in Garage two breakers in one slot Tandem breakers are only allowed in number and slots that they are aproved for Most 40 slot panels are only approved for 40 poles I am looking two slot shelving One common version of a 42 slot panel in a smaller ETA the buss bar slot of the breaker itself was different between two breakers

two slot shelving A tandem breaker is a breaker that provides two separate and different circuits in the same circuit breaker slot Said breaker slot can be completely regular-

two slot toaster Designed for commercialindustrial applications, the new 1” wide Siemens bolt-on BT breaker is a TandemDuplex type which will allow two 1-pole circuits per Both A and B circuits of a tandem breaker unit use the same phase, or incoming service leg corresponding to that slot 120V circuits use one leg