grounding electrodes for separate buildings

[benmin]

400A single meter service on a backboard with 2 200A breakers. supplies 2 buildings. Does each of the 2 buildings require grounding electrodes? Ground rods at the service.

 

[iwire]

400A single meter service on a backboard with 2 200A breakers. supplies 2 buildings. Does each of the 2 buildings require grounding electrodes? Ground rods at the service.

If the AHJ considers them separate structures than yes each will need a grounding electrode system.

How far are the buildings from the backboard?

 

[benmin]

One is 70' the other is 200'. I was not sure yesterday when I arrived and since they were pouring slabs and both had the panels in the center of the buildings, I drove ground rods and ran CU along with the conduit to the panels. Unfortunately, was unaware of the pouring schedule so was unable to get a UFER ground at the footing

 

[infinity]

Since there are footings then you are required to use a CEE if they contain 1/2" or larger rebar. It's up to the AHJ to determine how they want to deal with the fact that the CEE wasn't installed.

 

[iwire]

One is 70' the other is 200'.

Don't forget the disconnecting means required at each building.

 

[benmin]

Don't forget the disconnecting means required at each building.

Main beaker panels

Since there are footings then you are required to use a CEE if they contain 1/2" or larger rebar. It's up to the AHJ to determine how they want to deal with the fact that the CEE wasn't installed.

Ran #4 GEC to rods on exterior so at least I got the wire to the outside

 

[infinity]

Ran #4 GEC to rods on exterior so at least I got the wire to the outside

I many places that wouldn't be acceptable because use of the CEE is required. If the AHJ accepts your two rods then good for you.