Egc question

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nickelec

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Let's say you have a 12x12 pull box in the middle of 3 pipe 1" emt run 3 coming in 3 leaving straight if there are no splices in that box it's my understanding that the egc does not have to spliced to a tail that is connected to the box . Unless there are splices in side that box. Am I wrong? And can you refrence a Code section

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I have never quite understood the purpose of this rule. The EMT is already bonded to the box and presumably it is bonded to the EGC at the source. Why would it need rebonding in a j-box?

And what if you don't pull a wire type egc? why would you need the tail?
 
No splices then no bonding jumper required to the box since it's already bonded by the metallic conduit. I agree with Bob this is a dumb rule, no splices no jumper, no EGC no jumper, splices then jumper, silly.
 
petersonra said:
I have never quite understood the purpose of this rule. The EMT is already bonded to the box and presumably it is bonded to the EGC at the source. Why would it need rebonding in a j-box?

And what if you don't pull a wire type egc? why would you need the tail?
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If you don't use a wire EGC and this rule applies to a box with splices, you put a bonding bushing or other fitting that can receive a jumper on each conduit entry, and then land that bonding jumper on the box.

One place where this rule certainly would matter, is if you are using a plastic enclosure. Or plastic conduit, or both. The rule would be in place to bond the backplane. But I agree, I don't exactly see the point for a metal enclosure.
 
Dennis Alwon said:
I don't understand... if you don't have an equipment grounding conductor then you don't need a tail.
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I meant to say why wouldn't you need the tail if emt is used as the egc if you need one for a wire type egc? it seems absurd that you run a wire type conductor and a tail is required but not if you use the emt as the egc.
 
Ty I agree it's a dumb rule but it's certainly not the only one in our Electrical Bible

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We usually run an egc even if we are using a metallic raceway because it's a spec on alot of jobs we do so it kind of became a company standard.

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nickelec said:
We usually run an egc even if we are using a metallic raceway because it's a spec on alot of jobs we do so it kind of became a company standard.

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A lot of people do.

I have run into a fair amount of EMT that has come apart so can kind of appreciate having a wire egc inside that is not dependant on the fittings not coming apart. Less of an issue with threaded fittings.
 
petersonra said:
A lot of people do.

I have run into a fair amount of EMT that has come apart so can kind of appreciate having a wire egc inside that is not dependant on the fittings not coming apart. Less of an issue with threaded fittings.
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Agreed

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iwire said:
Then you are not following the NEC requirements for running that EMT.

Not to mention that with or without an EGC a pulled apart fitting is a danger that should be repaired.
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I don't see much EMT in factories these days. Used to see a lot more of it. I think because I was visiting places that were cheap.

I also think most of the stuff I saw that had come apart was the EMT that you had to indent the fitting to keep it together. I don't even know if they make that kind anymore.
 
Carultch said:
If you don't use a wire EGC and this rule applies to a box with splices, you put a bonding bushing or other fitting that can receive a jumper on each conduit entry, and then land that bonding jumper on the box.
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Code reference, please?
 
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