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Assuming this falls under the National Electrical Code (NEC) the size for the service ground is based on the conductor size of the Ungrounded (Hot) conductors. For 150A the size of XHHW Copper would be 1/0 for the Hot conductors and #6 AWG copper for the ground. Aluminum would be 3/0 for the Hot conductors and #4 AWG aluminum for the ground.

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13y ago
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15y ago

1/0 will handle 150 amps if the wire is rated 75 C, 2/0 would be safer.

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14y ago

Size 1

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Shammas Shaz

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1y ago
25

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Wiki User

11y ago

#4 Copper.

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Anonymous

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3y ago

#6

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Anonymous

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3y ago

#6

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Anonymous

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3y ago

#6

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Q: What size ground wire is needed for a 150 amp service?
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