250.30

electrofelon said:
Just note than an outdoor transformer and/or other equipment is unlikely to be a structure, but there are other sections that require a grounding electrode there.
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It appears the only time the SSBJ is required is for indoor XFMR installations.


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electrofelon said:
Or for outdoor transformers where there is a metallic path such as metal conduit.
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electrofelon said:
Or for outdoor transformers where there is a metallic path such as metal conduit.
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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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Off hand I would say if you didn't have a SBJ at the gear you would need to have both a neutral and SSBJ.
 
ptonsparky said:
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?
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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 said:
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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IF I understand it, the neutral or grounded conductors will all be in parallel. They are bonded together at both ends.
 
Isaiah said:
If the neutral is bonded at ONE location only what purpose does the GEC serve at both locations?


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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)
 
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.
 
Dsg319 said:
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.
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Art 250 has to be the most confusing in the NEC.
Thanks to all


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