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A 500 MCM wire with an insulation factor of 90 degrees C is rated at 430.

Most 400 amp services will use parallel wires on each leg to feed the circuit.

A 3/0 wire with an insulation factor of 75 and 90 degrees C is rated at 200 and 225 amps respectively.

The insulation rating of these conductors will be 600 volts.

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9y ago
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11y ago

Typically 400 kcmil in Copper or 600 kcmil in Aluminum.

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Q: What size wire is needed for 400 amp 480 volt service?
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