Parallel Sets of GEC
- Thread starter W@ttson
- Start date
- Status
- Location
- Chapel Hill, NC
- Occupation
- Retired Electrical Contractor
IMO, it would be a violation however, the code does not address this for grounding electrode conductor's. I would use 310.10(H) as a premise that doesn't allow parallel for smaller than 1/0. Again the code does not mention grounding electrode conductor's.
One can say that since the code doesn't mention it in 310.10(H) then it is not permitted to be paralleled.
One can say that since the code doesn't mention it in 310.10(H) then it is not permitted to be paralleled.
If you have 3 raceways, a full size GEC is required in each raceway.
- Location
- Connecticut
- Occupation
- Engineer
Why would a GEC be required in any of the raceways?
PVC, spec.
- Location
- Connecticut
- Occupation
- Engineer
PVC wouldn't require a GEC to be run with the service conductors. You may be confusing GEC with EGC.
Some AHJs do not allow conduit to be used as a GEC.
- Location
- Connecticut
- Occupation
- Engineer
Conduit can never be used as a GEC. You may be confusing GEC with EGC.
- Location
- Chapel Hill, NC
- Occupation
- Retired Electrical Contractor
These are different animals
(GEC)= grounding electrode conductor
(EGC) = equipment grounding conductor
(GEC)= grounding electrode conductor
(EGC) = equipment grounding conductor
If they haven't made a formal amendment and they are inspecting for NEC compliance they have no choice in the matter.
Roger
- Location
- New Jersey
- Occupation
- Journeyman Electrician
The answer is yes it's a violation. You need to size the GEC according to 250.66 which has no provisions for paralleling.
https://www.phoenix.gov/pddsite/Documents/2012_amend_index.pdf
Page 270
I had them enforce with RGC too...
So the inspectors stretch their amendments to cover other raceways even though they have only addressed EMT.
Roger
I thought I read once in the forum that the NEC is a permissive Code meaning that if it doesn't forbid it then it is allowed, or was it the opposite that I read?
LarryFine
Master Electrician Electric Contractor Richmond VA
- Location
- Henrico County, VA
- Occupation
- Electrical Contractor
The relevant question is whether the paralleling prohibitions exclude GEC's.
Good point, I choose a poor example. Suppose you paralleled 2 - 1/0 to make a 2/0 equivalent. Or you are saying since Ground Electrode conductor is not specified and only "Grounded Circuit" is listed, it cannot be paralleled?
Ah, I see what you are saying.
- Location
- Connecticut
- Occupation
- Engineer
The prohibitions in 310.(H) do not apply to GEC's.
kwired
Electron manager
- Location
- NE Nebraska
250.66 says size of grounding electrode conductor, does not include "or equivalent", as is leaves this open to interpretation.
Can you use bus bar as a GEC? If so how do you size it? All that is in T250.66 is wire conductor sizes and it doesn't say "or equivalent".
Food for thought, IDK the answer.
Can you use bus bar as a GEC? If so how do you size it? All that is in T250.66 is wire conductor sizes and it doesn't say "or equivalent".
Food for thought, IDK the answer.
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