Equipment Grounding System Question

[FrancisDoody]

One building, two separate sections, divided by a fire rated wall. The existing section is a 3 phase delta service. This will remain and not be touched. I am revamping the existing 100 amp service to a 200 amp 3-gang meter with disconnects and by-pass. The question I have is can I tap off the 3 phase EGC that runs pass my system to the city water main or do I have to run a separate #4 conductor next to the existing #4. I think that I proably have to keep the two systems separate and run a new EGC.

Thanks,
Fran

 

[Dennis Alwon]

One building, two separate sections, divided by a fire rated wall. The existing section is a 3 phase delta service. This will remain and not be touched. I am revamping the existing 100 amp service to a 200 amp 3-gang meter with disconnects and by-pass. The question I have is can I tap off the 3 phase EGC that runs pass my system to the city water main or do I have to run a separate #4 conductor next to the existing #4. I think that I proably have to keep the two systems separate and run a new EGC.

Thanks,
Fran

Are we talking GEC rather than EGC????

 

[FrancisDoody]

Gec

Gec

GEC, yes Denis that was my mistake. The conductor I am speaking of is the GEC that runs between the main disconnect and the city water main.

Thanks,
Fran

 

[Dennis Alwon]

GEC, yes Denis that was my mistake. The conductor I am speaking of is the GEC that runs between the main disconnect and the city water main.

Thanks,
Fran

I think you need one GEC for each area. I don't believe you can tie on to the other #4.

 

[FrancisDoody]

Sometimes you hope for what you can't get

Sometimes you hope for what you can't get

It was no big deal. Dollar for dollar it does not mean much in the final numbers but I was hoping to save a few dollars before Christmas.

Thanks Dennis

 

[Physis 3]

All service equipment needs to be bonded to the grounding electrode system. If there is more than one service then they can either have seperate gronding systems, in which case they need to be bonded together with a bonding jumper or they can simply share a single groundinging system. I wish I could give you the code, but I can't.

 

[Physis 3]

The question I have is can I tap off the 3 phase EGC that runs pass my system to the city water main or do I have to run a separate #4 conductor next to the existing #4. I think that I proably have to keep the two systems separate and run a new EGC.

Thanks,
Fran

Sorry ,I misread your question a bit. But still, you can go to the nearest conveinient electrode, as long as what's existing is legal, and you'll be cool. Tapping the GEC I can't answer without a code book.