upstatemike
Senior Member
I don't know how many wires will fit into a 1 inch hole but if it is not enough the answer is probably not to make a bigger hole but instead make more holes. Somewhere there is a spec for the largest hole you can make in a 2X4 before you impact its structural integrity. Not sure what that size is but it might be worth finding out before you start drilling. I think there are also rules about how much space you need to have between holes along a board, etc. And of couse avoid drilling through anything designated as a doorway header or support beam at all.