Steel conduit with bare grounding conductor

[Isaiah]

Does a steel conduit containing bare copper grounding conductor require bonding per NEC?


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[hbiss]

Yes, to the conductor at both ends.

-Hal

 

[infinity]

Is it a GEC or an EGC? A GEC would require bonding whether it's bare or insulated.

 

[Isaiah]

Is it a GEC or an EGC? A GEC would require bonding whether it's bare or insulated.

It’s actually part of the equipotential bonding grid - not really an electrode but it’s all over the place
They’re using it to bond equipment and stubbing up with RGS and bare grounding conductors


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[Isaiah]

Yes, to the conductor at both ends.

-Hal

Thanks Hal, agreed completely but does this show up in the NEC?


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[infinity]

They’re using it to bond equipment and stubbing up with RGS and bare grounding conductors

If it's not a GEC then I don't see why bonding to the raceway is required.

 

[Isaiah]

If it's not a GEC then I don't see why bonding to the raceway is required.

What about the magnetic choking effect if there is a fault to the grid?



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[infinity]

What about the magnetic choking effect if there is a fault to the grid?

What in the NEC would require that if the conductor within the raceway is not a GEC? Besides that any fault should be returning on the EGC.

 

[roger]

What about the magnetic choking effect if there is a fault to the grid?



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That would only apply to a GEC. You said it was for bonding equipment which would not be part of the GES.

 

[Isaiah]

That would only apply to a GEC. You said it was for bonding equipment which would not be part of the GES.

But the ground loop is tied to the electrode system - ground rods so it’s not really possible to separate the two


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[Isaiah]

What in the NEC would require that if the conductor within the raceway is not a GEC? Besides that any fault should be returning on the EGC.

It’s not required to be in a conduit but that’s the way it was designed
MOST of the fault current will travel via the EGC…but not all of it.


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[roger]

But the ground loop is tied to the electrode system - ground rods so it’s not really possible to separate the two


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Every EGC is also tied to the GES.

 

[Isaiah]

Every EGC is also tied to the GES.

Correct so you’d have at least two paths for a fault current to flow: One of very low impedance via the EGC and another via the ground loop of much higher impedance.


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[roger]

Correct so you’d have at least two paths for a fault current to flow: One of very low impedance via the EGC and another via the ground loop of much higher impedance.


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Which is always the case and would not affect the GEC.

 

[Isaiah]

Which is always the case and would not affect the GEC.

Yes we agree - but what does that have to do with bonding the steel conduit with bare bonding conductors?
If we don’t have to do it per NEC that’s great. But it seems like they should be bonded


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[ActionDave]

I don't think it needs to be bonded per NEC and I don't think there is any choke effect to worry about for a stub.

 

[Isaiah]

I don't think it needs to be bonded per NEC and I don't think there is any choke effect to worry about for a stub.

Thanks , I’ll go with that But,
If the grounding cable were routed in a long conduit run vs just a stub up would that make a difference?


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[Dale001289]

Good design would dictate the steel conduit should be bonded when bare grounding conductors are utilized.

 

[infinity]

Good design would dictate the steel conduit should be bonded when bare grounding conductors are utilized.

Design maybe, code wise not required. Which is the OP's question.

Does a steel conduit containing bare copper grounding conductor require bonding per NEC?

 

[Isaiah]

Design maybe, code wise not required. Which is the OP's question.

Correct. If it’s not required by NEC we’re not going to do it. It means a lot of rework


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