When I wired mine is used EMT tube between metal boxes spaced 8 feet apart (every second metal post). All wire was 12 G for 20A capability and all outlets are 20A 4 gang sets.
All outlets are both grounded to the metal building and to a return ground wire in the tube. Dedicated 20A breakers carrying no more than 3 boxes per breaker.
Dedicated 220v for both compressor and welder. 100 A Sub panel for Hoist.
Shed is on a dedicated separate meter, 200A feed from utility pole.
Average power bill over 12 months is around $45 a month. (I use waste oil for heat and ceiling fans for summer air movement.) Build room has air con, but it is only used about three months a year.
