8' ground rod

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DrSparks said:
What about bonding the rebar in the slab?

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In addition to what others said, I think it depends on the situation and what you are trying to accomplish. For something like a substation, swimming pool, or dairy barn Yes you want that equipotential plane. For just a regular slab in a building, I don't see bonding the rebar accomplishing much, and if trying to use that as a grounding electrode remember it may have insulation or vapor retarders under it isolating it from the ground.
 
electrofelon said:
In addition to what others said, I think it depends on the situation and what you are trying to accomplish. For something like a substation, swimming pool, or dairy barn Yes you want that equipotential plane. For just a regular slab in a building, I don't see bonding the rebar accomplishing much, and if trying to use that as a grounding electrode remember it may have insulation or vapor retarders under it isolating it from the ground.
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It may or may not be effective as grounding electrode, but doesn't fit NEC criteria for use as a CEE either, needs to be in the footing for use as a CEE.
 
I was just about to ask a similar question: Why do i have to put a ground ring with , in this case 28, ground rods. What exactly are they doing. All are about ten foot off the equipment pad. why the rods and why the 4/0 bare roped around the building. Can anyone point me in the right direction or just a direction?
 
mooreaaryan said:
I was just about to ask a similar question: Why do i have to put a ground ring with , in this case 28, ground rods. What exactly are they doing. All are about ten foot off the equipment pad. why the rods and why the 4/0 bare roped around the building. Can anyone point me in the right direction or just a direction?
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28 rods & 4/0 sounds like a lightning mitigation system?
 
retirede said:
28 rods & 4/0 sounds like a lightning mitigation system?
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That makes sense for this project but back home in Bakersfield Ca we barely get rain or storms and we do the same thing there with no LPS. DO you known of a credible source where I could under stand how an LPS works this will be the first one I see get install.
 
mooreaaryan said:
I was just about to ask a similar question: Why do i have to put a ground ring with , in this case 28, ground rods. What exactly are they doing. All are about ten foot off the equipment pad. why the rods and why the 4/0 bare roped around the building. Can anyone point me in the right direction or just a direction?
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Someone's design decision and not a NEC requirement to do such.
 
electrofelon said:
In addition to what others said, I think it depends on the situation and what you are trying to accomplish. For something like a substation, swimming pool, or dairy barn Yes you want that equipotential plane. For just a regular slab in a building, I don't see bonding the rebar accomplishing much, and if trying to use that as a grounding electrode remember it may have insulation or vapor retarders under it isolating it from the ground.
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That's true. They do put rigid foam under slabs these days.

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retirede said:
My comment was based on the quantity of rods and the wire size you mentioned, not anything I’ve seen.
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Yeah the whole thing sounds like some over-engineered voodoo hogwash. I could see having a zillion rods to try to get to some resistance value (of course then we could question what they think they are accomplishing with a low resistance) but the 4/0 just is absurd, cannot think of any logical or scientific reason for that. My understanding is lightning does not really care about DC resistance
 
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