Electrode Conductor Size
- Thread starter session88
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- Occupation
- Licensed Electrician
Need to know the size of the ungrounded conductors, then look at 250.66.
- Location
- New Jersey
- Occupation
- Journeyman Electrician
Dave had the answer, it's in 250.66 and the question cannot be answered with the information provided. Hint: it's not #6.
- Location
- Chapel Hill, NC
- Occupation
- Retired Electrical Contractor
The #4 is not needed to the ground rod- #6 is all that is required but a #4 GEC to the water pipes would be the general requirement for a 200 amp service.
Electrode Conductor Size
The SEC's are 3/0. An 8' ground rod was installed at the service along with a grounding electrode conductor to the water main. So could the rod be consided THE electrode and the water main piping be considerd the supplemental electrode?
Or is the rod always considered the supplemental electrode to an underground metal water pipe?
The SEC's are 3/0. An 8' ground rod was installed at the service along with a grounding electrode conductor to the water main. So could the rod be consided THE electrode and the water main piping be considerd the supplemental electrode?
Or is the rod always considered the supplemental electrode to an underground metal water pipe?
Doesn't matter -- they both exist and must be wired accordingly. #6 maximum to rods, #4 maximum to UFER. But there are advantages to just using #4 for everything (some install limitations on #6 and definitely #8 GEC's), doesn't matter to which electrode you go to first when you use the same largest size wire throughout.
You may even need two rods, unless you can probe the resistance of just one is 25 ohms or less.
You may even need two rods, unless you can probe the resistance of just one is 25 ohms or less.
- Location
- Tennessee NEC:2017
- Occupation
- Semi-Retired Electrician
You wouldn't need two rods if you also use the water pipe, providing it has 10' in the ground.
- Location
- Chapel Hill, NC
- Occupation
- Retired Electrical Contractor
IMO, the rod is the supplemental since the code states that the underground water line be supplemented by a method in 250.52(A)(2) thu (A)(8).
- Location
- New Jersey
- Occupation
- Journeyman Electrician
So what electrode would be the supplemental electrode that the water pipe requires?
- Location
- Chapel Hill, NC
- Occupation
- Retired Electrical Contractor
Since we posted at the same time I missed your comment. Go to art 250.53(D)(2)
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