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Minimum size grounding conductor for a 200 amp service entrance is #6 bare copper.

The conductor connected to a metal water pipe, or whatever your primary grounding electrode is, is required to be #4 copper. This size requirement is often missed.

The conductor connected to a ground rod is only required to be #6 regardless of the size of service. Typical installation is #6 bare solid copper.

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11y ago
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11y ago

A 3/0 (000) copper conductor with an insulation factor of 75 and 90 degrees C is rated at 200 and 210 amps respectively.

In the United States the NEC makes special provisions for service conductors to dwellings. A 200 amp service panel may be served with 2/0 copper conductors.

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14y ago

4/0 is only rated at 185 amps.

You will need 250 MCM wire rated at least 75C, preferred 90C for a 200 amp service.

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12y ago

3/0 copper wire with a insulation factor of 90 degree C is rated at 210 amps.

250 MCM aluminum wire with an insulation factor of 90 degrees C is rated at 215 amps.

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13y ago

2/0 AWG in copper 4/0 AWG in Aluminum. (4/0 is pronounced 4 Aught and is 0000)

A listed anti-oxidant compound must be used on all aluminum conductor terminations (NEC 110.14)

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11y ago

3/0

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Q: What size and type of wire is used for ground in 200 amp service?
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