In a 400-A main breaker panelboard fed from a transformer with a single conduit containing four 500 kcmil conductors, what is the smallest size copper wire permitted to be used as the main bonding jumper?

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Multiple Choice

In a 400-A main breaker panelboard fed from a transformer with a single conduit containing four 500 kcmil conductors, what is the smallest size copper wire permitted to be used as the main bonding jumper?

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