§250.122 · Sizing the equipment grounding conductor

Why inspectors flag this

A circuit upsized for ambient temperature with the EGC left at the original size is the typical 250.122 failure; the drafter lifts the rule so the spec keeps the EGC sized with the conductor.

As quoted in the code: The equipment grounding conductor is sized from Table 250.122 by the overcurrent device protecting the circuit, never smaller than the circuit conductor's required minimum, and increased in the same proportion when the circuit conductor is increased for adjustment or correction factors.