Grounding & Bonding Calculators

Determine the minimum equipment grounding conductor size based on the overcurrent protective device (OCPD) rating. Includes proportional upsizing per 250.122(B) when circuit conductors are increased in size.

OCPD (Breaker) Rating (A) 15 A 20 A 25 A 30 A 35 A 40 A 45 A 50 A 60 A 70 A 80 A 90 A 100 A 110 A 125 A 150 A 175 A 200 A 225 A 250 A 300 A 350 A 400 A 450 A 500 A 600 A 800 A 1000 A 1200 A 1600 A 2000 A

EGC Material Copper Aluminum

Conductors upsized from minimum? (250.122(B))

Original (Minimum) Conductor Size 14 AWG 12 AWG 10 AWG 8 AWG 6 AWG 4 AWG 3 AWG 2 AWG 1 AWG 1/0 AWG 2/0 AWG 3/0 AWG 4/0 AWG 250 kcmil 300 kcmil 350 kcmil 400 kcmil 500 kcmil 600 kcmil 700 kcmil 750 kcmil 800 kcmil 1000 kcmil 1200 kcmil

Upsized Conductor Size 14 AWG 12 AWG 10 AWG 8 AWG 6 AWG 4 AWG 3 AWG 2 AWG 1 AWG 1/0 AWG 2/0 AWG 3/0 AWG 4/0 AWG 250 kcmil 300 kcmil 350 kcmil 400 kcmil 500 kcmil 600 kcmil 700 kcmil 750 kcmil 800 kcmil 1000 kcmil 1200 kcmil

Calculate EGC Size

Determine the minimum grounding electrode conductor size based on the largest ungrounded service-entrance conductor per NEC Table 250.66.

Largest Service-Entrance Conductor Size 14 AWG 12 AWG 10 AWG 8 AWG 6 AWG 4 AWG 3 AWG 2 AWG 1 AWG 1/0 AWG 2/0 AWG 3/0 AWG 4/0 AWG 250 kcmil 300 kcmil 350 kcmil 400 kcmil 500 kcmil 600 kcmil 700 kcmil 750 kcmil 800 kcmil 900 kcmil 1000 kcmil 1250 kcmil 1500 kcmil 1750 kcmil 2000 kcmil

Service Conductor Material Copper Aluminum

Calculate GEC Size