NEC · 2023 National Electrical Code

§250.118 · The equipment grounding conductor in NW Indiana commercial installations must be copper only when the overcurrent device protecting the circuit exceeds 60 amperes; aluminum EGC remains permitted below that rating.

Local amendment on §250.118 for the NEC 2023 NW Indiana jurisdiction.

Plain-English explainer

The NW Indiana amendment to §250.118: in commercial installations the EGC must be copper when the overcurrent device protecting the circuit exceeds 60 A; aluminum EGC is still permitted below that threshold. The drafter cites it for commercial rewires in NW Indiana.

Why inspectors flag this

A commercial spec running aluminum EGC on a 90A circuit is a 250.118 red-tag in NW Indiana; the drafter surfaces the rule so the spec carries copper on circuits over 60A.

As quoted in the code: See §250.118 amendment.

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