I want to run some 110volt and 220 volt lines in my shop. I just installed the subpanel and wanted some basic info. on running conduit. How many no. 12 THHN lines can you run in EMT 1/2"? I want four 110 outlet boxes and three 220 lines on one wall. The 220 would all be one one circuit and same with the 110. How would you run the wires for this? Keep the two voltages separate or run all in one conduit?

I've heard people here say to wire quad boxes with two separate circuits in each box. Any info. to get me started on this project much appreciated. Alan in Md.