I am planning on similar MWBC wiring in a new shop we are constructing (40x30 pole barn). I plan to use a double pole 20 amp GFCI breaker for each circuit in a 200 amp panel, and put at least one double gang box with one 15-20 and one 6-20 receptacle in each 8 foot bay along the interior walls, so on My question is: how many of these double gang boxes can I put on each circuit?
I will be the only person working in the shop, so only one tool that draws substantial power on a circuit will be on at a time.
I could put each double gang box on a dedicated circuit with a homerun to the panel, but I'd rather not run all that extra 12/3 wire unless required by code. I will have separate dedicated circuits for dust collection, air filtration, possibly for an air compressor, lights, overhead doors, and HVAC heat pumps.
Thank you in advance for any guidance.