EGC or GEC?

[Jennifer K.]

The ground wire from a service switchboard to the main building ground bar is an equipment grounding conductor, correct?

 

[petersonra]

The ground wire from a service switchboard to the main building ground bar is an equipment grounding conductor, correct?

Could be several things.

EGC. Bonding jumper of some kind. Might even be a GEC.

Is the switchboard really the service point?

I don't know what you mean by main building ground bar.

 

[infinity]

The ground wire from a service switchboard to the main building ground bar is an equipment grounding conductor, correct?

GEC.

 

[charlie b]

_{Most of my designs place the N-G bond inside the service switchboard. A ground wire from the neutral bar in the direction of planet Earth (via the bus bar on the electric room wall) is a GEC.}

 

[tom baker]

From Mike Holt "What color is it and what does it do?"
Most call it a ground which means nothing.

 

[kwired]

The ground wire from a service switchboard to the main building ground bar is an equipment grounding conductor, correct?

More details on what this "main building ground bar" is critical to the answer.

If it is a place for multiple services to tie together and then connect the grounding electrode system to it - each connection to each service is a bonding jumper I would think.

If it is a place for other systems to be able to connect grounding/bonding conductors to - I'd still say it is a bonding jumper but doesn't necessarily need to be sized the same way as the other condition I mentioned.

 

[petersonra]

If it is a place for multiple services to tie together and then connect the grounding electrode system to it - each connection to each service is a bonding jumper I would think.

250.30(A)(6) calls it a grounding electrode conductor tap.

 

[kwired]

250.30(A)(6) calls it a grounding electrode conductor tap.

Ok thanks. I was aware of what that section allows, but did not look to see if they gave a name to such a conductor. Sort of a name that only applies to that section and not a name that applies to the NEC in general or even art 250 in general - or it would probably be in art 100 or 250.2.

 

[romex jockey]

The ground wire from a service switchboard to the main building ground bar is an equipment grounding conductor, correct?

Where is the MBJ?

~RJ~

 

[Dale001289]

The ground wire from a service switchboard to the main building ground bar is an equipment grounding conductor, correct?

The building ground bar is an extension of the grounding electrode system therefore an external grounding conductor form the switchboard is most likely the GEC.

 

[petersonra]

The building ground bar is an extension of the grounding electrode system therefore an external grounding conductor form the switchboard is most likely the GEC.

only if it is.

it could also just be a place to land EGCs.

the term is ambiguous.

 

[Dale001289]

only if it is.

it could also just be a place to land EGCs.

the term is ambiguous.

Building grounding bars are either bolted or welded to building steel - this is an extension of grounding electrode system or equipotential grid. For applications of an EGC, see 250.118 or better yet see 250.134(B) handbook for best explanation.

 

[petersonra]

Building grounding bars are either bolted or welded to building steel - this is an extension of grounding electrode system or equipotential grid.

that is true, in the narrow case you just defined.

but building grounding bar is not a NEC defined term so it does not mean much in the context of the OP.

it could mean just about anything. or nothing.