My panel is very limited. At the moment, I have 2 spaces open. I also have an un-used 30 amp 220V breaker that is for my electric dryer, but I use gas. My garage only has 15A @ 120v, but I want to add some 240V so I don't have to use the hack job with the dryer outlet adapter cable.
I have a few options and I'm not sure if all are legal and if one is best.
I have 3 240V pieces of equipment to consider.
Table Saw: G0715P "8A at 220V"
Jointer: G0568 "12A at 220V"
Dust collector: Unknown, but lets say 2HP, so G0548ZP to make it easy. "240V, single-phase, 9A"
1) Get a quad double poll common trip breaker (BQC220220) for the last tandem breaker spot. Use it to make 2x 240V @ 20 amp circuits. Use one for table saw or jointer and the other for the dust collector.
2) remove the 30A dryer breaker, cap of the wires, add full sized 20 A 240V breakers to make 2x circuits
3) Use the last 2 pole slot to add a 30 A breaker and do a multi gang outlet with 6-30 outlets to run the saw OR jointer AND DC at the same time one one circuit. this would require me to change the cords on the equipment to p6-30 plugs. I have a bunch of heavy duty 12 awg raw extension cord for this.