Question: What is the minimum size copper bonding conductor for an interior metal water piping system if the building is supplied by a service that has

What is the minimum size copper bonding conductor for an interior metal water piping system if the building is supplied by a service that has a large ungrounded service entrance conductor size of 2,500kcmil ?
a.20 AWG
b.30 AWG
c.250 kcmil
d.350 kcmil
What is the minimum size copper bonding conductor

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