[HayZee518]

7-8 current carrying conductors, according to the code must have their amperage capacity reduced by 70% if bundled together. if laid out flat on a nail board they retain their current rating, or nailed to the face of a joist. ok -- say, 8 12/2 romex cables of 20 amps each times 70% equals no more than 14 amps each. this is due to radial heating.
I am to be corrected. I checked and misled you. 2/3 aluminum will carry 100 amps. I looked in the book and checked outside I got some SEU aluminum for 100 amp -- it's 2/3 aluminum.