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Use what is called bell wire or thermostat wire.
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.
The size breaker you use is determined by the size wire used in the circuit. If you use AWG #12/2 wire then use a 20 amp breaker. If you use AWG # 14/2 then use a 15 amp breaker.
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A 100 amp service requires that you use AWG 4 copper wire or AWG 2 aluminum wire.