Check out this wiring arrangement I came across today (I’m a home inspector). This was on a 4 year old home, so I think this is the builder’s handy work. There is a 20A circuit breaker serving a 10 AWG wire with a 12 AWG jumper wire tied into a 15A circuit breaker. The combo circuit breaker was labeled “A/C spare”. I think it is used for one of the two HVAC units. I wrote it up as requiring further evaluation…This installation/configuration just seems wrong to me! Has anyone seen anything like this before? Any input would be appreciated.