For a 20 amp circuit, a 12-gauge copper ground wire is typically recommended. This wire size can safely handle the current and provide proper grounding for the circuit.
It depends on the length of the run
The size of the ground wire for a circuit is typically based on the size of the circuit breaker protecting that circuit. For a 200 amp circuit breaker, the recommended ground wire size is 4/0 AWG (American Wire Gauge) copper wire. This wire size helps ensure that the ground wire can safely carry any fault currents that may occur in the electrical system.
For a 70 amp service at 240 volts, you would typically use a wire size of 4 AWG copper wire. This wire size is suitable for carrying 70 amps of current safely over a 240 volt circuit. Be sure to consult local electrical codes and regulations to ensure compliance with requirements in your area.
For a 50 amp breaker, you should use a wire size of at least 6 AWG for copper or 4 AWG for aluminum conductors to ensure the wire can handle the current safely and meet safety codes and standards. It is important to consult the local electrical code requirements and consider factors such as wire length and insulation type when selecting the appropriate wire size.
AWG # 8 copper.
A 100 amp residential service requires a size #8 copper wire, it should be insulated in green.
AWG #4 copper.
2 copper
# 10 bare copper.
Use AWG #1 copper service entrance wire and #4 copper ground wire.
30 amp breaker with #10 gauge copper wire
For a 20 amp circuit, a 12-gauge copper ground wire is typically recommended. This wire size can safely handle the current and provide proper grounding for the circuit.
AWG 2/0 copper wire.
Ground is sized based on the size of the feeder wire and not the amps of the service! However, for a 600 amp service 1500MCM copper wire is one option (NEC 310.16) ;therefor, ground wire is 3/O copper (NEC 250.66) or another option is a two sets of 350 MCM copper wire then a #2 copper (since the biggest feeder wire is 350MCM).
AWG # 3/0 copper.
A 100 amp service requires that you use AWG 4 copper wire or AWG 2 aluminum wire.