Use #10 copper.
Wiki User
∙ 9y ago#6 bare copper wire.
#4 copper.
#6 copper or #4 aluminum
#2 AWG copper to water main #6 AWG copper to ground rod
#8 copper wire.
#6 bare copper wire.
#4 copper.
#6 copper or #4 aluminum
#2 AWG copper to water main #6 AWG copper to ground rod
To calculate the wire size, a system voltage is needed.
A 200 amp service panel will require a # 4 bare copper ground wire.
#8 copper wire.
Minimum size grounding conductor for a 200 amp service entrance is #6 bare copper.
A #14 wire will do fine for grounding a 20 amp device. That is the size of the ground wire in a 2 conductor # 12 wire building cable.
#8
#6 wire is needed. If placing the subpanel in a garage at a good distance, it is recommended to also install a seperate ground rod .
#8 is the size of wire to use for grounding a 100 Amp panel. Green is color used for grounding #8 is code.