I am building a new 16' x 20' workshop, for small DIY projects. I don't expect to do any welding, or anything that requires more than what a portable tool will draw. I do want to have a 220v outlet in the new shop though. My main house service panel is 200 amp, and is located about 100 ft from where the new shop panel will be. Half of the 100 ft will be under-ground. I am thinking that 60 amps in a smaller service panel in the shop would be sufficient to handle the circuits for the lights, outlets, window A/C, etc. Do I put a 60 amp breaker in the main house panel, and 15 & 20 amp breakers in the shop panel, or do I also need a 60 amp breaker as a main breaker in the subpanel? What size wire do I need to run from the main house panel to the new subpanel in the shop? Can I run unshielded wire if in pvc conduit?