MBJ
- Thread starter mannyb
- Start date
- Location
- New Jersey
- Occupation
- Journeyman Electrician
Find the circular mil area of #3/0 and multiply by 2. Look up the number in T250.66.
Rick 0920
Senior Member
- Location
- Jacksonville, FL
- Occupation
- Electrical Instructor
But if your grounding electrode system consists only of two ground rods, your GEC would not be required to be larger than #6 copper per NEC Art. 250.66
- Location
- New Jersey
- Occupation
- Journeyman Electrician
Since he actually said bonding jumper the correct table is 250.102(C). Calculation would be the same for a GEC.