Gec

[wirebender]

I am doing a project with a 1200 amp service.
PVC water supply.
Post-tension foundation.
Wood framing.

The engineered plans call for a 3/0 GEC.

What do I attach this to?

 

[Dennis Alwon]

I am doing a project with a 1200 amp service.
PVC water supply.
Post-tension foundation.
Wood framing.

The engineered plans call for a 3/0 GEC.

What do I attach this to?

How about to a concrete encased electrode or call the engineer and see what he was thinking. It just may be a standard part of their specs and he/she didn't edit it out.

 

[wirebender]

I put a #4 in the footing (no steel, post-tension) but I don't think attaching a 3/0 to it will do much good.

 

[Dennis Alwon]

I put a #4 in the footing (no steel, post-tension) but I don't think attaching a 3/0 to it will do much good.

Here is where the phone call comes in. The EE was probably thinking copper pipes.

 

[Cow]

I put a #4 in the footing (no steel, post-tension)

Hopefully that wasn't an oversight on your part. We did a school addition a while back with a 4 or 600 amp service. We had to lay the 3/0 in the concrete per the specs.

 

[ohmhead]

wirebender I am doing a project with a 1200 amp service.
PVC water supply.
Post-tension foundation.
Wood framing.

The engineered plans call for a 3/0 GEC.

What do I attach this to?:confused


Well on post tension jobs there is rebar and steel around columns and beams & pads so you can cad weld to that footer or column pads ? we weld our 3/0 grounding elec copper to the rebar in the footer or rebar in the column pads per spec . uffer ground is 20 foot of copper layed down in footer or under slab dont forget your ground rods ,build steel i never had a job with just pvc water cant help ya there . best to ya

 

[infinity]

I would run the #4 GEC to the service and ask for a change on the plans from the engineer. In doing so you will have complied with the NEC.

 

[Pierre C Belarge]

Code is the minimum installed required, one can always exceed the code.

If there are no qualifying electrodes as per 250.52, one could drive two ground rods and install a GEC sized at 6 AWG. 250.66(C)


If the specs call for other than, then one could call the engineer and see if the specs are "cut & paste" , and if they are not get further direction from the engineer.

 

[nakulak]

regardless of the post tensioning, why can't you throw a suitable piece of metal in the concrete to make your cce ?

 

[infinity]

regardless of the post tensioning, why can't you throw a suitable piece of metal in the concrete to make your cce ?

He already did:

I put a #4 in the footing (no steel, post-tension) but I don't think attaching a 3/0 to it will do much good.

 

[wirebender]

I would run the #4 GEC to the service and ask for a change on the plans from the engineer. In doing so you will have complied with the NEC.

Thanks, Rob, that's what I thought.

Thanks for everyone's input.

We also ran a #4 out from the service for a ground rod in case the POCO wants one. Some of them around here require one, others don't.