GEC to ufer ground

[ELI56]

I am installing a 400amp residential service.the general contractor did not install a ufer grounding system.In talking to the inspector my best bet is to chip into the footing 20 feet apart and clamp onto the rebar and then test for continuity.What I thought the inspector said to do was run one run of #4 copper to the footing and then at the panels splice a second #4 with nonreversible clamp to #4 so as to connect to the other panel.I have never been in this situation,have always ran separate conductors from each panel to the ground rods in the past.Any help would be greatly appreciated

 

[Smart $]

Welcome to the forum :thumbsup:



Sounds like he is suggesting a common GEC with taps to each panel per 250.60(D)(1). With the #4 being determined by 250.66(B) //citation off the top of my head// taps to each panel will not be smaller than the common GEC.

The reason for chipping the footer in two places 20' apart is to verify continuity of the rebar in between. You only need use one as an attachment point upon verification.

 

[ActionDave]

I am installing a 400amp residential service.the general contractor did not install a ufer grounding system.In talking to the inspector my best bet is to chip into the footing 20 feet apart and clamp onto the rebar and then test for continuity.What I thought the inspector said to do was run one run of #4 copper to the footing and then at the panels splice a second #4 with nonreversible clamp to #4 so as to connect to the other panel.I have never been in this situation,have always ran separate conductors from each panel to the ground rods in the past.Any help would be greatly appreciated

Washington has some special rules but since you have access to the footer I would see if he would sign off on 20' of #4 encased in concrete down at footer level rather than chipping into the foundation. It would meet the requirement of a CCE.

 

[gndrod]

Emergency UFER

Emergency UFER

I am installing a 400amp residential service.the general contractor did not install a ufer grounding system.In talking to the inspector my best bet is to chip into the footing 20 feet apart and clamp onto the rebar and then test for continuity.What I thought the inspector said to do was run one run of #4 copper to the footing and then at the panels splice a second #4 with nonreversible clamp to #4 so as to connect to the other panel.I have never been in this situation,have always ran separate conductors from each panel to the ground rods in the past.Any help would be greatly appreciated

Has the garage slab been poured?