# 3 gauge
6 AWG
The current will remain in a 220 volt circuit as long as the circuit load remains in the circuit and the circuit remains closed.
No !
4 AWG copper or 2 AWG aluminum.
If it's a 220 volt circuit without a neutral bring wire into panel, put ground wire on ground bar, put load wires onto breaker.
Yes 220 & 240 are considered the same.
12 AWG in most circumstances.
yes <<>> No, the ground wire is never to be used as a neutral. In this case if you need a 120 volt circuit from the 220 volt circuit a three wire cable (3C #14) must be installed.
Can you supply three 220 -240 volt 16.6 amp infrared heaters with one circuit?
NO - that is dangerous.
Depending on the configuration of the cord cap, the green wire is ground, the white wire is the neutral and red and black wires are the 220 volt source.
Cannot answer this question. Will need to know the voltage and amperage of the circuit. Also need to know the application i.e. is it a lighting circuit or a motor circuit?