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You need to look at the regulations that apply in your country. If in doubt, use a neutral wire of the same size as the live wire or wires.
AWG # 3/0 copper.
You will need AWG #3 if it is a short run.
Depends on the size of the circuit which you did not list.
A 12 gauge wire can support a load of approximately 2200 watts.
You need to look at the regulations that apply in your country. If in doubt, use a neutral wire of the same size as the live wire or wires.
Yes, they are the same size wire.
Answer for USA, Canada and countries running a 60 Hz supply service.240 volt two wire circuits loads do not need a neutral to operate. A three wire 240 volt circuit that needs a neutral, will have a neutral the same size as the current carrying conductors. In this case a #10.
AWG # 3/0 copper.
On a 200 amp or any size service the ground wire is easily identified. Look in the distribution panel for the neutral bus bar. This is where the service neutral (white wire) is connected to the distribution panel. There you will see a bare copper wire connected to the same neutral bar. This is the ground wire that is connected to the ground rods out side of the house.
You will need to use #8 wire.
#2 Copper with TW insulation is required for 100 amp loads #3 Copper with R90 insulation is rated at 105 amps.
8 AWG is typical.
8 AWG copper.
You need a 60 amp breaker.
#3 copper.
2AWG.