I want to run a 40amp, 4-circuit sub panel 300 ft. from my house, what size wire do i need?

Question

or a 60amp 4 circuit ... depends on how much more it would cost
thanks
for a little home away from home,, just plan on having lights and a couple baseboard heaters in winter and ac units in summer.

thanks

Answer 1

NEC requires #8 wire in conduit or direct burial, #10 for single conductor (separated conuctors) in free air. The best insulation for all-weather service is XHHW

Answer 2

You can end up with some very serious problems by not wiring a sub panel properly.If you have a twenty and thirty ckt there will be a difference of 10 amps.If the sub panel is bonded to the neutral from the main panel, the sub panel box can be electrically live and be a very dangerous shock hazard, even if the sub is just a 120 volt system and u r pulling say 25 amps with the neutral tied to the sub panel box then yes the sub box can/will be live to ground. That is why the code says the neutral MUST be insulated/isolated from the ground or metal enclosure of the sub panel the sub panel box

Answer 3

10mm