wrote in message
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In recent posts I have heard mention of 12/2 and 10/2 wire, as well as
12/3 and 10/3 wire. What is the difference and what would you wire a
new shop with?

I assume the 12/2 and 10/2 mean with ground.? What is the extra wire
in the 12/3 and 10/3 for? Is that for wiring 220V?

Jim

10/3 and 12/3 are with ground. Also there are only 3 wires in those cables.

10/2 and 12/2 only have 2 wires.