2 Services 1 Building

[Richterfan]

I have a building that currently has a 1600 amp 3ph service and its maxed out. I have received approval to add a 2nd 1600 amp 3ph service to the same building. Its a z purlin construction, butler building we call them.
My question is that since the services are on opposite sides of a large building. The utility company is installing a new transformer outside, so do I have to,
1) run all the way across to tie to the existing grounding electrode unbroken,
2) tie to the closest building steel then pick up close to existing service and then connect at 1st gear
3) just tie to the closest existing steel and make sure its connected at the existing service
4) install new electrodes at the new service.

 

[augie47]

As long as your structural steel complies as a grounding electrode you can follow your #3.
{See 250.52(A)(2) & 250.68(C)}

edit to add references

 

[david]

As long as your structural steel complies as a grounding electrode you can follow your #3.

i agree,

You would think the building (only) has one grounding electrode system.

You need to clarify if you are bonding to building steel or is the building steel a grounding electrode.
You need to bond to the buildings “grounding electrode system”.

Even if you add additional grounding electrodes your only extending the grounding electrode system for the building

 

[GoldDigger]

Even if you add additional grounding electrodes your only extending the grounding electrode system for the building

And that means that any new electrodes you add must be connected into the existing building GES. But it may be possible to bond them with a bonding jumper rather than a GEC, which means that it need not be continuous/irreversibly connected.