Table 250.122 · Table 250.66
Ground wire size, by rating
Verified against NEC 2023, checked against the 2026 edition · Last checked August 18, 2026
Pick a rating and get the equipment ground for the breaker or feeder, and the grounding electrode conductor where a dwelling service exists at that rating. Every page separates the two tables that answer this question, because mixing them changes the size.
- 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
- 700 A
- 800 A
- 1000 A
- 1200 A
EGC and GEC, cited to the row, offline.
The JobVolt app sizes grounding with the exact NEC table row shown, and exports inspector-ready PDF submittals on your letterhead.
