250.24(A)(2)

[m sleem]

(2) Outdoor Transformer. Where the transformer supplying the service is located outside the building, at least one additional grounding connection shall be made from the grounded service conductor to a grounding electrode, either at the transformer or elsewhere outside the building.

Does this rule apply for outdoor feeder transformer?

 

[electrofelon]

Does this rule apply for outdoor feeder transformer?

No

Edit: that is one of the oddest codes and should just be deleted.

 

[m sleem]

In terms of lightning protection, i think it's required particularly the code doesn't mention the distance of the transformer away from served building.

 

[electrofelon]

In terms of lightning protection, i think it's required particularly the code doesn't mention the distance of the transformer away from served building.

The problem I have is the POCO will ground at the transformer. I guess the NEC doesn't trust the POCO to do it, after all that rod is very important.

 

[m sleem]

Even Though, can we play with POCO equipment?

 

[electrofelon]

Even Though, can we play with POCO equipment?

Right. Can we count a rod on the POCO side of service point as meeting this requirement?

 

[electrofelon]

Outdoor Transformer. Where the transformer supplying the service is located outside the building, at least one additional grounding connection shall be made from the grounded service conductor to a grounding electrode, either at the transformer or elsewhere outside the building.

So as I said, I hate this. This has been bugging me all day. What does this even mean? So I have my "regular" grounding electrodes/electrode system and grounding electrode conductor, and I have to add an addition grounding electrode conductor that connects to the grounded conductor at a different spot? It sounds like it could connect to a stand alone electrode if not close enough (whatever that would be) to trigger 250.50 or 250.58, otherwise it sould just be a second GEC connecting the same GES.

 

[m sleem]

But still, it's required for feeder transformer.

 

[electrofelon]

But still, it's required for feeder transformer.

Essentially, but covered by a different section, 250.30. And that is dumb too though. Why not just use the supply EGC as the GEC for the SDS?