A 750 MCM copper conductor with an insulation factor of 90 degrees C is rated at 500 amps.
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Depends on the size of the service. 100 amp service will require 3 gauge, 150 amp service will require 1/0 gauge, and 200 amp service will require 3/0 gauge.
25mm cable
14 gauge will handle it with a 15 amp breaker. If you use 12 gauge use a 20 amp breaker.
No, 10 gauge wire requires the use of a 30 amp breaker. A 20 amp breaker is only used on 12 gauge wire.