Isaiah
Senior Member
- Location
- Baton Rouge
- Occupation
- Electrical Inspector
It appears the only time the SSBJ is required is for indoor XFMR installations.
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250.30
- Thread starter Isaiah
- Start date
It appears the only time the SSBJ is required is for indoor XFMR installations.
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electrofelon
Senior Member
- Location
- Cherry Valley NY, Seattle, WA
Or for outdoor transformers where there is a metallic path such as metal conduit.
Isaiah
Senior Member
- Location
- Baton Rouge
- Occupation
- Electrical Inspector
In our case all the connections from transformer to SWGR are via underground PVC conduit.
Are there any scenarios where a parallel neutral would exist along side a SSBJ?
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ptonsparky
Tom
- Occupation
- EC - retired
Are all the transformers connected to the same GES at the outdoor location?
Is the respective Service Equipment for each SDS connected to a common GES?
Is the respective Service Equipment for each SDS connected to a common GES?
Isaiah
Senior Member
- Location
- Baton Rouge
- Occupation
- Electrical Inspector
They’ve used a common GES for all XFMRS and SWGR in the form of a grounding ring (buried approx 36” deep) with very few ground rods/test wells and no bonding whatsoever to rebar. Not good design but it’s what we got from the engineering firm.
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Isaiah
Senior Member
- Location
- Baton Rouge
- Occupation
- Electrical Inspector
ptonsparky
Tom
- Occupation
- EC - retired
IF I understand it, the neutral or grounded conductors will all be in parallel. They are bonded together at both ends.
Isaiah
Senior Member
- Location
- Baton Rouge
- Occupation
- Electrical Inspector
That’s why I feel the GEC should be at one end only
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ptonsparky
Tom
- Occupation
- EC - retired
You need a GES & consequently a GEC at each location. The neutral bond should be at only one.
Isaiah
Senior Member
- Location
- Baton Rouge
- Occupation
- Electrical Inspector
If the neutral is bonded at ONE location only what purpose does the GEC serve at both locations?
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ptonsparky
Tom
- Occupation
- EC - retired
You need a GES at both locations. Are there two now or only one? No connection other than earth.
If the neutral is bonded at one location then you need the SSBJ. If the neutral is bonded at both locations, you do not need the SSBJ but you need a SBJ at both locations and a grounding electrode system at both per 250.30(C)
Dsg319
Senior Member
- Location
- West Virginia
- Occupation
- Wv Master “lectrician”
Say your system bonding jumper is at the transformer and also your GEC/GES.
At the next location the GES would just terminate in the equipment grounding bus and leave the noodle floating in the gear correct?
Just like a sub panel at a remote structure that requires its own grounding electrode system. You would tie It to the grounding bar and float the neutral.
I am obviously not talking as using the exception for parallel paths and grounding neutral at both locations.
At the next location the GES would just terminate in the equipment grounding bus and leave the noodle floating in the gear correct?
Just like a sub panel at a remote structure that requires its own grounding electrode system. You would tie It to the grounding bar and float the neutral.
I am obviously not talking as using the exception for parallel paths and grounding neutral at both locations.
Isaiah
Senior Member
- Location
- Baton Rouge
- Occupation
- Electrical Inspector
Art 250 has to be the most confusing in the NEC.
Thanks to all
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