Adding another service

[Jkgardner]

I have an existing 200 amp meter Main and are addition turns our property into a duplex. The existing meter main is fairly new and the plan is to add another meter Main with riser to accommodate. My question is do I need to run separate grounding electrode conductors to two separate rods for each or can I run a 400 amp rated grounding electrode conductor from one panel through the two rods to the next panel for my ufer?

 

[augie47]

Each service disconnect must have its own grounding electrode conductor. You can install a properly sized conductor and then tap to each disconnect or you can run a separate GEC from each disconnect to the existing electrode(s).
An electrode conductor can not run thru another panel.