Yes, It can be used on a two pole 15 or a two pole 20 amp breaker to give you the 240 volt supply that is needed depending on what the current load is. A #12 wire is rated at 20 amps and has to be derated to 80% if used on a contineous class load. 20 x .8 = 16 amps.
no
Junction box for what? Do you mean a sub panel?
10 gauge will suffice.
the wires coming off double pole will give you 240 volts,110 each the black and white hook to these,doesn`t matter which way,ground to ground Ground is always ground, Black and white are your two "hots." You will need a dedicated circuit, you cannot run this off existing 120V wiring. A 15A 240V circuit should be more than sufficient. If this is a permanent instalation you can use 14/2 wire as you normally would, and wire it as you normally would with the exception of the 240V breaker. If you install switches, timers, etc. Make sure they are all rated for 240V. Remember, you can't just mix-and-match between 120 and 240V. 240 appliances will not run on 120 and 120 appliances will burn up on 240.
4 wire household wiring is black, red, (hot wires) white (neutral) and bare or green (ground wire). You say 3 wires. Is it 120v or 240v. If its 240v which is more common just use the two hots and the ground and cap off the neutral wire.
its black and white or if its relay the color changes
Junction box for what? Do you mean a sub panel?
10 gauge will suffice.
In North America it takes two "hot" wires to obtain 240 volts.
Don't!
Yes.
no. depending on length of run you'll need either 10 or 6 gauge wire for a 30 amp double pole breaker.
No.
the wires coming off double pole will give you 240 volts,110 each the black and white hook to these,doesn`t matter which way,ground to ground Ground is always ground, Black and white are your two "hots." You will need a dedicated circuit, you cannot run this off existing 120V wiring. A 15A 240V circuit should be more than sufficient. If this is a permanent instalation you can use 14/2 wire as you normally would, and wire it as you normally would with the exception of the 240V breaker. If you install switches, timers, etc. Make sure they are all rated for 240V. Remember, you can't just mix-and-match between 120 and 240V. 240 appliances will not run on 120 and 120 appliances will burn up on 240.
It depends on the amount of power/current drawn from the generator. A small amount of current requires thin wire, more current requires thicker wire. The siae of wire can be calculated when the current is known.
4 wire household wiring is black, red, (hot wires) white (neutral) and bare or green (ground wire). You say 3 wires. Is it 120v or 240v. If its 240v which is more common just use the two hots and the ground and cap off the neutral wire.
5 mm
two hot one ground