GEC connection to a SSBJ

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Canton

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On an installation with multiple service disconnects, can the Grounding Electrode Conductor connection be made to a Supply Side Bonding Jumper in a trough or other enclosure?

Im asking because 250.64(D)2 and 3 are throwing me off. What application would (3) Supply Side Bonding Jumper be where you would make the connection there?

Thanks!
 
Yes. The NEC allows splices in the grounding electrode conductor on the supply side, which includes in a trough or wireway when there is more than one service switch. Of course, one might use a bus bar as a splice elsewhere.
  • NEC Article 250-64 (C) (2)
  • NEC Article 250-64 (D) (1)
 
Yes, it would appear you can. But Im trying to see the exact detail of the install.

Would it allow the individual GEC connections to be to the SSBJs in a trough on the line side of two service disconnects with a mechanical lug, then the SSBJ continues to its service disconnect and being bonded to the neutral?

I’m trying to see an actual application where you would make the connection of the GEC to a SSBJ, versus going directly to the disconnect grounded conductor?

Thanks
 
That section is rather poorly arranged and worded IMO. For example, it seems to me using (3) with a connection to a SSBJ could be the same thing as the tap method in (1). It is further confusing because the code is vague in how to run SSBJ's where there are multiple service enclosures. Despite that confusion, an application of (3) might be where you have a tap box/bussed gutter/wire way ahead of the service disconnects, which is bonded by a SSBJ instead of 'directly' to the grounded conductor. I'm that case you could tag the GEC to that SSBJ.
 
I am going to need to see a one-line diagram showing how the supply side bonding jumper has been installed.
 
electrofelon said:
That section is rather poorly arranged and worded IMO. For example, it seems to me using (3) with a connection to a SSBJ could be the same thing as the tap method in (1). It is further confusing because the code is vague in how to run SSBJ's where there are multiple service enclosures. Despite that confusion, an application of (3) might be where you have a tap box/bussed gutter/wire way ahead of the service disconnects, which is bonded by a SSBJ instead of 'directly' to the grounded conductor. I'm that case you could tag the GEC to that SSBJ.
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I agree, IMHO ALL of Article 250 could be written better
 
don_resqcapt19 said:
I am going to need to see a one-line diagram showing how the supply side bonding jumper has been installed.
Click to expand...
Don, I’m really just trying to see how in a real world application where the GEC would be bonded to a SSBJ instead of directly to the Service Neutral.

Article 250.64(D)(2)(3) appears to allow individual GECs to be connected to SSBJs when you have multiple disconnects. The usual more restrictive requirements you see for GECs are not present in this section.

It appears it would allow a double barrel mechanical lug to make the GEC to SSBJ connection if you had multiple disconnects.

What is your opinion? Thanks
 
Canton said:
Yes, it would appear you can. But Im trying to see the exact detail of the install.

Would it allow the individual GEC connections to be to the SSBJs in a trough on the line side of two service disconnects with a mechanical lug, then the SSBJ continues to its service disconnect and being bonded to the neutral?

I’m trying to see an actual application where you would make the connection of the GEC to a SSBJ, versus going directly to the disconnect grounded conductor?

Thanks
Click to expand...
 

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LadyDI, thanks you for the reply. That is an example of a Common Grounding Electrode Conductor with GEC Taps, not the article or example I was referring to.

I’m talking about GECs being connected to SSBJs
 
Canton said:
Don, I’m really just trying to see how in a real world application where the GEC would be bonded to a SSBJ instead of directly to the Service Neutral.

Article 250.64(D)(2)(3) appears to allow individual GECs to be connected to SSBJs when you have multiple disconnects. The usual more restrictive requirements you see for GECs are not present in this section.

It appears it would allow a double barrel mechanical lug to make the GEC to SSBJ connection if you had multiple disconnects.

What is your opinion? Thanks
Click to expand...
That was my point, I don't see where the connection would be made to a supply side bonding jumper. A one line showing the grounding details would explain it for me.
 
Canton said:
multiple service disconnects . . . Supply Side Bonding Jumper
Click to expand...
My first thought is that the allowances for connecting a GEC to a SSBJ in 250.64(D)(2) and (3) are not applicable for a building with multiple service disconnects, as there would be no SSBJs. Rather those allowances are for the case of a building supplied by feeder(s) with multiple disconnects and are the analog of 250.32(B)(2).

Cheers, Wayne
 
wwhitney said:
My first thought is that the allowances for connecting a GEC to a SSBJ in 250.64(D)(2) and (3) are not applicable for a building with multiple service disconnects, as there would be no SSBJs. Rather those allowances are for the case of a building supplied by feeder(s) with multiple disconnects and are the analog of 250.32(B)(2).

Cheers, Wayne
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I'm not sure I agree Wayne. What do you think of my example in post #4?
 
electrofelon said:
I'm not sure I agree Wayne. What do you think of my example in post #4?
Click to expand...
Not sure yet. Would your jumper be a SSBJ, or would it just be a splice/tap of the grounded conductor? Does the term "metal parts" in the definition of SSBJ include circuit conductors? If not, then your jumper is not an SSBJ.

Cheers, Wayne
 
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