LB with bonding screw?

S

solarken

NABCEP PVIP
Location
Hudson, OH, USA
Occupation
Solar Design and Installation Professional
Any manufacturer make LB's with EGC binding screw inside for terminating wire-type EGC when transitioning from PVC conduit to EMT?
 
As long as you are not installing EMT in between sections of PVC without ever bonding the EMT, then if your EMT is installed properly, it should be bonded for the whole length including the LBs when the EGC is bond to an enclosure.
 
Rock86 said:
As long as you are not installing EMT in between sections of PVC without ever bonding the EMT, then if your EMT is installed properly, it should be bonded for the whole length including the LBs when the EGC is bond to an enclosure.
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I don't think you read the part about transitioning from PVC to EMT
 
solarken said:
I don't think you read the part about transitioning from PVC to EMT
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I did read that. What I was saying is that if you go PVC - EMT - PVC, then you would need to bond the EMT. If you have an EGC in conduit that goes PVC - EMT, then the EMT should be bonded at the next metal enclosure.
 
Got a Stupid question: Why not just use the PVC LB? No bonding issue then.

Every metal LB I've seen has only ben listed for use with Rigid, EMT, IMC conduit.
 
If only a section from Enclosure A to Metal LB is PVC and from LB to enclosure B is metal conduit the you only need to bond one end anyway and that can be at Enclosure B
 
The OP wants to use the EMT as the sole EGC in that section of the run, so the bonding is necessary to change over from the wire type EGC to the EMT type EGC.

Cheers, Wayne
 
wwhitney said:
The OP wants to use the EMT as the sole EGC in that section of the run, so the bonding is necessary to change over from the wire type EGC to the EMT type EGC.

Cheers, Wayne
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With respect to the OP that sounds like a shoty thing to do. is it really that much of a cost savings to not run the EGC the whole length? I wont disagree that it would be code legal to add the box and make the bond, but I wouldn't be a fan of it.
 
Rock86 said:
With respect to the OP that sounds like a shoty thing to do. is it really that much of a cost savings to not run the EGC the whole length? I wont disagree that it would be code legal to add the box and make the bond, but I wouldn't be a fan of it.
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Not sure I understand why you think it is shoty. EMT or rigid conduit is a permitted EGC. There are situations with long runs where including a wire-type EGC inside EMT would require upsizing to the next size vs just using the EMT as the EGC. There are also situations where it might be advantageous to not have to terminate a bunch of wire-type EGC's, such as in a metal wiring trough where you can avoid having to install a ground bar. Also, if circuit conductors are increased in size for voltage drop reasons, EMT as the EGC does not have to be proportionally increased in size like wire-type.
 
One way to go If you don't want to run a EGC all the way through both the PVC and EMT or Rigid is to use an LT C body and jump out of one unused port of the LT with the EGC that extends through the PVC and use a bonding clamp onto the EMT. As long as the other end of the metallic conduit is extended all the way to the bonded metal enclosure or other bonded equipment. Just be sure to use a sealing connector on the
EGC exit point.
Application may also work if the metallic conduit is in middle of a non-conductive run.
 
solarken said:
Not sure I understand why you think it is shoty. EMT or rigid conduit is a permitted EGC. There are situations with long runs where including a wire-type EGC inside EMT would require upsizing to the next size vs just using the EMT as the EGC. There are also situations where it might be advantageous to not have to terminate a bunch of wire-type EGC's, such as in a metal wiring trough where you can avoid having to install a ground bar. Also, if circuit conductors are increased in size for voltage drop reasons, EMT as the EGC does not have to be proportionally increased in size like wire-type.
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I think it is shoty to go from PVC to EMT and no continue the EGC. I understand what you said, but if I started the run with an EGC, i would continue it regardless. If I were to come make a repair after you were long gone and I saw an EGC on one but not the other, it could make for a waste of time tracing out where the EGC went.

And if you are concerned about conduit size, you are going to go in PVC at one size and transition to a smaller EMT? IMO, i'm not a fan, but it if you find it to be a code legal install, have at it.
 
ptonsparky said:
I've drilled and tapped conduit bodies before. Could have been because the PVC one I needed was a 100-mile round trip.
A little oxide inhibitor on the ground screw threads and you're good to go.
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Was the metal thick enough to have a full 2 thread engagement?
 
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