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A #8 copper conductor with an insulation factor of 75 or 90 degrees C are both rated at 45 amps.
For a 200 amp service panel to the water meter, it is recommended to use a 4 AWG copper wire or 2 AWG aluminum wire as the ground wire. This will provide sufficient grounding capacity for the service panel and meet code requirements. Be sure to check local electrical codes for specific requirements in your area.
The amp size of a wire is determined by its gauge, not the number of wires. An 8-gauge wire is typically rated for around 40-60 amps, depending on the type and insulation of the wire.
For a 200 amp service with a 60 foot run, it is recommended to use 3/0 AWG copper wire or 250 kcmil aluminum wire to ensure proper voltage drop and capacity for the load. Be sure to consult with local codes and a licensed electrician for specific requirements and installation guidance.
15 and 20 amps for receptacles and lights, and anywhere from 20 to 60 amps for dedicated loads such as water heaters and air conditioning. The fuse size MUST be matched to the load and wire size, you cannot just arbitrarily pick one!