I want to put a sub panel in my shed for a few circuits. It’s roughly 150’ run from my panel in the house to my shed. I already have conduit run the whole way. I was given two pieces of wire that I wanna use and I already have a 8”x8” junction box. One wire is 6/3 THW submersible pump wire with a #8 ground. The second wire is 4/3 tray cable THHN/THWN with #8 ground. Sixty feet of the conduit is inside my basement where I will put the junction box before going outside. One question is can these wires be put in conduit and second does it matter whether I start from my panel with the 6/3 or 4/3 ? Obviously I know I can’t over amp the smaller wire so I was thinking of putting a 60 amp double pole breaker in for the circuit. If I’m reading the chart right the maximum amps for #6 THW copper is 65. What should I use for a splice for putting a #6 and #4 wire together? Thanks for any help
Steve
Steve