Join Date: Sep 2008
Location: Victoria B.C. Canada
Thanked 101 Times in 92 Posts
Rep Power: 9
12 gauge is fine for an individual AC circuit, in this case the microwave's 15 amp circuit. 10 gauge should be used for the main input to the panel from the shorepower inlet.
I use 14 gauge for individual AC circuits of 15 amps.
Living aboard in Victoria Harbour