3/0 awg copper
AWG 2/0 copper.
0000 . four zero .. four ought
A 200 amp service panel will require a # 4 bare copper ground wire.
200 amp service entrance wire should be AWG # 2/0 copper or 4/0 aluminum.
Number 2 American Wire Gauge
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.
This can't be answered without knowing the voltage, and ground is not the same as neutral, in AC circuits, which I'm assuming this is.
A 200 amp service panel will require a # 4 bare copper ground wire.
Service wire required is AWG # 3/0 copper.
10 guage
AWG # 3/0 copper.
As a service entrance wire you need AWG # 3/0 gauge copper.
200 amp service entrance wire should be AWG # 2/0 copper or 4/0 aluminum.
200 amp service in chicago uses 3 aught.
Number 2 American Wire Gauge
3/0 wire 3/0 wire
A 200 amp service panel with a 60 amp sub-panel.
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.
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.