When to use: Use whenever installing branch circuits, feeders, or service entrance equipment. NEC Article 250 covers two distinct grounding conductors:
EGC (Equipment Grounding Conductor): Runs in the same raceway as circuit conductors. Sized per NEC Table 250.122 based on the overcurrent protective device rating. Provides a fault return path.
GEC (Grounding Electrode Conductor): Connects the neutral/service to earth (ground rod, building steel, etc.). Sized per NEC Table 250.66 based on the largest service conductor.