Ground Wire Size Calculator

Determine equipment grounding conductor size per NEC Table 250.122.

Overcurrent Device Rating (Amps)

Conductor Material

Circuit Conductor Size (if increasing per 250.122(B))

Results

Select overcurrent device rating to determine ground wire size.

Table Value: Minimum EGC size based on OCPD rating

250.122(B): If circuit conductors are increased for voltage drop, EGC must be proportionally increased

250.122(F): Conductors in parallel require EGC in each raceway