Concrete encased grounding

[Daniel Geenen]

I'm working on a service with the main disconnect located outside the building and feeding to a 1600 amp switchboard inside the building. The swithcboard then feeds to a remote located 200 amp panelboard. I am putting in a concrete encased grounding grid to support the ground rods. The office complex has many computor loads and I have surge suppression at the MDP and want the best ground available. Should I tie the remote panelboard into the concrete encased grounding grid along with the MDP, Service disconnect, is it required?

 

[bphgravity]

Re: Concrete encased grounding

It would probably be more accurate to state the ground rods are supporting the concrete encased electrode.

To answer your questions, no and no.

The supplementary grounding of equipment is not required nor effective. Provide an adequate grounding system at the service, which you have, and then focus on effective fault bonding from that point on. The TVSS devices are a good idea as well.

 

[Jhr]

Re: Concrete encased grounding

The first thing is do you have a cold water line, this would be the main grounding electrode the concrete encased electrode would supplement the cold water,and if Bldg steel is present you would bond this to your GE, g-rods would not be needed.

 

[iwire]

Re: Concrete encased grounding

Originally posted by Jhr:
The first thing is do you have a cold water line, this would be the main grounding electrode

What is a 'main' grounding electrode?

 

[pierre]

Re: Concrete encased grounding

Take a look at 250.64(F)