Ground wire

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yankeeman411

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Just took over a job for another guy, ground ring was done around the building but the ring never went back to the electrical room and concrete has bee poured. Can i find a attachment point cafweld to it and run the wire out of ground through rigid pipe then once in the ceiling free air the wire and support with straps. Or does it have to be in pipe?
And can it be bare or have to be insulated?
thanks
 
How would i bond both ends. Are you saying usin a bonding bushin on the side with rigid coming out of the ground? If so would that ground wire on the bushing have to go back to the panel as well?

thanks in advance
 
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Got it. Thanks. That might be a problem. Its in a public location and i cant have the wire exposed going down the pipe. Can i squash the ground ring and just ad a couple rods in the electrical room or is the ground ring itself a code neccesity or a job spec?
 
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I dont think the kenny clamp would work. My understanding of the code is you would need an external ground running the length of the pipe because thepipe technically "chokes" the ground and in metal it will lose some of its grounding capabilitys. So you would have to put a grounding bushing on noth ends with lugs and then cadweld to theground wire.

i think

but my next question is can you abandon the ground ring and just drive some rods in the eectric room or is the ground ring code or an enginer spec.
 
yankeeman411 said:
I dont think the kenny clamp would work. My understanding of the code is you would need an external ground running the length of the pipe because thepipe technically "chokes" the ground and in metal it will lose some of its grounding capabilitys. So you would have to put a grounding bushing on noth ends with lugs and then cadweld to theground wire.

i think

but my next question is can you abandon the ground ring and just drive some rods in the eectric room or is the ground ring code or an enginer spec.
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IMHO, the ground inside the wire is adequate for normal fault current events (for which ground is not normally part of the solid fault clearing path anyway), so there is no need for any other alternate paths to also be irreversibly joined.
To deal with high frequency currents, as caused by direct or nearby lightning strikes, you also need the current to be able to flow along the pipe as well as through the conductor inside it.
There is no need for a separate conductor outside the pipe, period.
And the bond between the wire GEC and the pipe at each end does not have to be irreversible. JMO, YMMV.
 
I agree with you golddigger. Its kind of silly and redundent to ground a rmc with a bare copper ground in it. And its gonna eventually buried in dirt and have comcrete poured over it.

By the way golddiger i had to google all those abbreviations.
 
What would be the "approved" method to choke the wire at both ends. Sure a rx conn wouldn't fly. And to muscle and bend the conductor to fit into a grounding bushing ??? Wondering ? Thanks
 
yankeeman411 said:
How would i bond both ends. Are you saying usin a bonding bushin on the side with rigid coming out of the ground? If so would that ground wire on the bushing have to go back to the panel as well?

thanks in advance
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Use these.

H100.jpg


I would use PVC if it were me.

Roger
 
Choke doesnt mean to squeeze the wite in this case. It means to reduce its fault carrying ability. You would have to put a grounding bushing on both ends and connect them in my case to the ground ring.
 
ritelec said:
Nice !!!! Okay, I've seen those Thanks roger.
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You're welcome. Be careful when purchasing these, there can be a big difference in price between manufacturers

yankeeman411 said:
Choke doesnt mean to squeeze the wite in this case.
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Correct, it is referring to induction acting as a choke.
yankeeman411 said:
It means to reduce its fault carrying ability.
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To be more correct it is for reducing impedance by putting the metallic raceway and wire in parallel.
yankeeman411 said:
You would have to put a grounding bushing on both ends and connect them in my case to the ground ring.
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Which is what the fitting posted does, and you would only have to connect one end to the GE {the ring in your case) and the other end will terminate in the panel.


PVC is still the best solution.


Roger
 
So roger all i would have to do is put that squeeze type connector on both ends of the rmc contaming rhe ground wire and that would satisfy the nec. I was under the impression that i would have to run a seperate ground connecting the bushing externally. Those conn would be perfect, nothing to them. Pvc is not an option because its a parkng garage and could potentialy be exposed to bad drivers.

thanks for all the help, im a rookie foreman and need the help sometimes
 
yankeeman411 said:
So roger all i would have to do is put that squeeze type connector on both ends of the rmc contaming rhe ground wire and that would satisfy the nec. I was under the impression that i would have to run a seperate ground connecting the bushing externally. Those conn would be perfect, nothing to them. Pvc is not an option because its a parkng garage and could potentialy be exposed to bad drivers.

thanks for all the help, im a rookie foreman and need the help sometimes
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Here is a picture showing how they work, I know it's a small picture but it will give you the idea. They thread onto the conduit or fitting and then you tighten the clamp on the wire making the wire and conduit a parallel conductor.

cityhubs.JPG

Roger
 
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