I am working on laying out a grounding plan for one of our projects. The project consists of a new 50'x60' concrete slab foundation. There will be a concrete encased ground loop conductor around the entire perimeter of the slab. That loop will be exothermically tied to the existing plant grounding loop. Is there a certain distance requirement for where the new loop is tied to the existing loop? The new ground loop will also have ground rods placed as required. On top of the new slab, there are steel structural support columns that sit on concrete footings. To ground the steel column, i'm thinking of a couple of ways to do it:
1. A mechanical connection on the steel column to ground conductor to the rebar in the footing, and that rebar is tied to the rebar in the slab. The rebar in the slab is then tied to the ground loop.
2. A mecanical connection on the steel column to a ground conductor directly to the ground loop via an exothermic connection.
- For the columns down the center of the slab, my initial thought was to run a concrete encased ground cross conductor through the center of the slab exothermically connected to the perimeter ground loop and ground each column down the middle of the slab to that cross conductor.
I think either connection would work, I just have to check with the civil engineer to see if the rebar in the footings is tied to the rebar in the slab.
If the rebar in the slab is tied to the ground loop, the rebar in the column footing is tied to the rebar in the slab, and the rebar in the column footing is tied to the steel column, there would not be any need for any additional grounding for the column correct? If, so, if all the columns are tied together, and electrically continuous, is it necessary to ground every column?
Thank you in adance
1. A mechanical connection on the steel column to ground conductor to the rebar in the footing, and that rebar is tied to the rebar in the slab. The rebar in the slab is then tied to the ground loop.
2. A mecanical connection on the steel column to a ground conductor directly to the ground loop via an exothermic connection.
- For the columns down the center of the slab, my initial thought was to run a concrete encased ground cross conductor through the center of the slab exothermically connected to the perimeter ground loop and ground each column down the middle of the slab to that cross conductor.
I think either connection would work, I just have to check with the civil engineer to see if the rebar in the footings is tied to the rebar in the slab.
If the rebar in the slab is tied to the ground loop, the rebar in the column footing is tied to the rebar in the slab, and the rebar in the column footing is tied to the steel column, there would not be any need for any additional grounding for the column correct? If, so, if all the columns are tied together, and electrically continuous, is it necessary to ground every column?
Thank you in adance
