A 100 amp residential service requires a size #8 copper wire, it should be insulated in green.
NEC code requires #6 bare copper.
Yes, there are ground wire gauges. The approiate size ground wire must be matched to the size service you are installing. For instance a 200 amp serivce must be grounded with a # 4 bare copper ground wire.
#4 bare copper connected to two 8' copper ground rods 6" apart driven into the ground.
Use AWG #1 copper service entrance wire and #4 copper ground wire.
500 mcm
500
six awg
A 100 amp residential service requires a size #8 copper wire, it should be insulated in green.
A 200 amp service panel will require a # 4 bare copper ground wire.
#2
200 amp service in chicago uses 3 aught.
NEC code requires #6 bare copper.
500 mcm
On a 200 amp or any size service the ground wire is easily identified. Look in the distribution panel for the neutral bus bar. This is where the service neutral (white wire) is connected to the distribution panel. There you will see a bare copper wire connected to the same neutral bar. This is the ground wire that is connected to the ground rods out side of the house.
Yes, there are ground wire gauges. The approiate size ground wire must be matched to the size service you are installing. For instance a 200 amp serivce must be grounded with a # 4 bare copper ground 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).