At the service entrance you will need AWG 1/0 gauge.
3/0 gauge
6 AWG will handle 50 amps with a voltage drop of about 4 volts. If you go to 4 AWG and limit to 50 amps your voltage drop will be 2.5 volts.
AWG # 14 is the smallest wire you can install in a home and it can only be used in living areas. It will carry 15 amps.
140 AMPS
AWG # 10.
3/0 gauge
6 AWG will handle 50 amps with a voltage drop of about 4 volts. If you go to 4 AWG and limit to 50 amps your voltage drop will be 2.5 volts.
15 amps
A #8 wire with an insulation rating of 75 or 90 degrees C is rated at 45 amps.
A #3 copper wire with an insulation factor 90 degree C is rated at 105 amps.
A # 14 copper conductor will be fine to carry 8 amps at 120 volts. This size conductor is rated at 15 amps.
30 amps.
AWG # 14 is the smallest wire you can install in a home and it can only be used in living areas. It will carry 15 amps.
140 AMPS
70 amps.
5 amps
Zero. Watts is the product of Amps x Volts. As you can see an amperage value is needed. Voltage = Watts/Amps. Volts = 200/? 20 volts