I think you're a
I'm not an electrician either, but I think you're a little light on wire. #14 for 15 amp circuits, #12 for 20 amp circuits and #10 for 30 amp circuits. A 220 volt circuit just draws power from both legs of a single phase residential panel. Most motors up to 2hp can be run on a 20amp 220v circuit. Generally speaking, I don't think 15 amp circuits in a shop are a good idea, just too little capacity. Heavy 220v loads should be wired IAW equipment specifications.Dependent upon lighting selection one can generally get away with a Minimum #8 8 ft. DBL fluorescent lights on a single circuit.
The NEC limit for 14-gauge wire is 20 amps, which means you should never use 14-gauge wire in your 240-volt circuits, only your 120-volt circuits, or the amperage will exceed the wire's capacity. Using the basic electrical formula "Watts = Volts x Amps," the wire presents the equation Watts = 120 x 20 with a result of Watts = 2,400. You can load 2,400 watts onto your 14-gauge wiring for a 120-volt circuit.
Use 12 gauge for 220 under 40 amp and 10 gauge for 220V heavy load like welders and such .
No I'm Not an electrician and I didn't sleep in that Motel . I was a General contractor way way back and know just enough to be safe .
Length of wire run plays another tune to the equation but Not inside Your shop ,only power into the shop . Shops over 80 ft. in length from breaker box need be concerned .