10 gauge will work fine.
12 gauge wire is sufficient. Any larger is fine, but superfluous.
The link below shows a typical usage and a chart
A #6 copper conductor will limit the voltage drop to 2% or less when supplying 50 amps for 80 feet on a 240 volt system.
# 6 gauge.
A #10 wire with an insulation factor of 60,75 and 90 degrees C is rated at 30 amps.
AWG #8 wire on a 40 amp breaker.
A #6 copper wire with an insulation rating of 90 degree C is rated at 65 amps.
Use 8 gauge wire.
# 3 gauge
# 6 copper
Service entrance wire size is AWG # 3 copper.
A #6 aluminum conductor will limit the voltage drop to 3% or less when supplying 20 amps for 200 feet on a 240 volt system.
In North America you would need two 15 amp breakers to obtain 240 volts. The wire for a 15 amp circuit would be #14 AWG. So to answer the question, yes a 240 volt receptacle can go on a 15 amp circuit.
800 watts/ 240 Volts = 3.34 amps 14AWG wire with a 15 amp will do
You need 14-gauge wire for 15-amp circuits, and 12-gauge wire for 20-amp circuits. <<>> The question is confusing the ability of a wire to carry current, with the insulation factor of the wire. Any size wire can carry 120 volts. The insulation factor determines how much voltage can be applied to a wire. Standard wire voltages come in three voltages, 300, 600 and 1000 volt ratings. These ratings are up to and including, so 300 volt insulation wire will handle 120, 208, 240, and 277 volts. 600 volt insulation will handle all of the 300 volt range plus 347,415, 480 and 575 volts. 1000 volt insulation will handle all of the 300 and 600 volt ranges plus different voltages up to 1000 volts.
No. You will need a 14/3 with Ground.