For a 50 Amp circuit, the neutral wire should typically be sized according to the same gauge as the hot wires, which is usually a minimum of 6 AWG copper or 4 AWG aluminum. However, local codes and specific applications may influence the exact sizing. It's always best to consult the National Electrical Code (NEC) and any local regulations or an electrician to determine the appropriate wire size for your specific installation.
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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.