NEC · 2020 National Electrical Code
§250.118 · Types of equipment grounding conductors
Effective in NEC 2020 · NEC 2023 NW Indiana.
Plain-English explainer
250.118 lists the equipment grounding conductor types allowed: copper, copper-clad aluminum, or aluminum run with the circuit conductors; in raceways, the EGC must be listed and identified. Bare or insulated conductors in listed flexible raceways count as the equipment grounding path.
Why inspectors flag this
An EGC sized or listed wrong on a commercial rewire is the typical 250.118 red-tag; the drafter lifts the rule so the spec section carries the right conductor type.
As quoted in the code: The equipment grounding conductor run with circuit conductors may be copper, copper-clad aluminum, or aluminum; when installed in raceways, it must be listed and identified, and bare or insulated conductors in listed flexible raceways count as the equipment grounding path.
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