This question is an exact duplicate of:
I am trying to install a 60 amp sub panel in my house to power my wife's saltwater tanks. I know I need 6/3 to go from main panel to sub panel. My question is I have to run it along the wall to get to the ceiling then down the wall to get to sub panel. What type of wire and do I need conduit? The sub panel will be just outside the backdoor under the porch. Coming out of main panel the wire will be exposed upto ceiling then over about 2 feet at which time will go into ceiling. Then will come out porch ceiling outback into the sub panel. Project is on hold to I can get clarification.