Grounding electrode bonded to grid through Ibeam is it ok and code article?

K

kjroller

Senior Member
Location
Dawson Mn
Occupation
Master electrician
I have a grounding electrode coming from a generator the grounding grid is bonded to the I-beam but for a drag aboht 70 ft away from the generator. My question is can I bond it to the I beam at the closest part to the generator via exothermic weld. Or should i bring it all the way to the grounding grid where wire comes out of of thr concrete ? If I go to the ibeam the bonding connections will be roughly 70ft apart on each end of ibeam to connect grid to beam and electrode to beam and through the beam it would connect to the grid.. anything is helpful please and thank you
 
See if 250.64(C)(3) is what you're looking for.
 
Easier worded question. Can I use the structural steel to extend my my GEC to get to my grounding system. If i bond the GEC to the structure on one end and bond the ground system to the steel on the other ?
 
(2) The metal structural frame of a building shall be permitted to be used as a conductor to interconnect electrodes that are part of the grounding electrode system, or as a grounding electrode conductor. Hold-down bolts securing the structural steel column that are connected to a concrete-encased electrode complying with 250.52(A)(3) and located in the support footing or foundation shall be permitted to connect the metal structural frame of a building or structure to the concrete encased grounding electrode. The hold-down bolts shall be connected to the concrete-encased electrode by welding, exothermic welding, the usual steel tie wires, or other approved means.
250.68 does this mean what i can or is this what im referencing i beileve it is.
 
kjroller said:
So they are using the water pipe to extend ot to the grid
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I actually edited my post, see the new graphic and notice the jumpers on the I beam.

BTW, the term "grid" might not be the best term for describing the GES, Grounding Electrode System
 
So still though they are using water pipe to bring the GEC to the structure or ground ring to complete the system?
 
kjroller said:
So still though they are using water pipe to bring the GEC to the structure or ground ring to complete the system?
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Doesn't matter which electrode they go to first as long as it's sized correctly, however going to say the CEE first with a full size GEC when it could be a #4 could be unnecessary expense.
 
I need my mine bigger since its exposed to physical damage but my point is you can use steel to complete your GEC commection which it looks like you can im in an industrial setting
 
Code allows it but I've worked on a several older buildings where they did not want us to do that so I got to hammer drill and run 3/0 CU all the way. No idea why, but that was one of the things I always wanted to ask the engineer but never got a chance.
 
WD40 said:
Code allows it but I've worked on a several older buildings where they did not want us to do that so I got to hammer drill and run 3/0 CU all the way. No idea why, but that was one of the things I always wanted to ask the engineer but never got a chance.
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Because the engineer did not actually understand the reason for the GES or how it functions.
 
A GEC from a generator to the structure is a rare bird in these parts. Is the generator remote from the structure and is it a SDS (Switched Neutral) ?
 
It is a switched neutral and its right outside the structure but the structure is connected to groud ring
 
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