metallic vs non metallic flex

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Hfalz1 said:
Installing a 3/4" EMT, can i switch from EMT to NM sealtite and back to emt without being a code violation?
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If you switch to nonmetal conduit, you loose your electrical continuity for grounding. So it would have to be bonded on both sides and have a wire EGC.


Also, a common violation is to use straight thread connectors in couplings or other female fittings that are only listed for direct use with RMC or IMC conduit. The proper way to transition is to either land on the walls of a pull box or use a transition coupling between the two conduit types.
 
Carultch said:
If you switch to nonmetal conduit, you loose your electrical continuity for grounding. So it would have to be bonded on both sides and have a wire EGC.


Also, a common violation is to use straight thread connectors in couplings or other female fittings that are only listed for direct use with RMC or IMC conduit. The proper way to transition is to either land on the walls of a pull box or use a transition coupling between the two conduit types.
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True. It is a listing violation. But it is a common practice and it has been done that way for number of years.
 
Carultch said:
If you switch to nonmetal conduit, you loose your electrical continuity for grounding. So it would have to be bonded on both sides and have a wire EGC.


Also, a common violation is to use straight thread connectors in couplings or other female fittings that are only listed for direct use with RMC or IMC conduit. The proper way to transition is to either land on the walls of a pull box or use a transition coupling between the two conduit types.
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You wouldn't have to bond the EMT if there is a wire EGC in it.
 
jumper said:
...A metallic raceway still has to be bonded regardless if there is an EGC or not.

if EMT was run between two plastic boxes and the circuit had an EGC, the EMT would still have to bonded.
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Agreed. But I had a lot of trouble thinking up the scenario where it wasn't done by being properly connected to a bonded box. You made that simple. I'll probably still go through my career without ever seeing it, though.
 
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Originally Posted by Little Bill
You wouldn't have to bond the EMT if there is a wire EGC in it.
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jumper said:
huh?

A metallic raceway still has to be bonded regardless if there is an EGC or not.

if EMT was run between two plastic boxes and the circuit had an EGC, the EMT would still have to bonded.
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Maybe littlebill has a point. Short section of raceway do not have to be bonded. 250.86 exception #2
 
jumper said:
huh?

A metallic raceway still has to be bonded regardless if there is an EGC or not.

if EMT was run between two plastic boxes and the circuit had an EGC, the EMT would still have to bonded.
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It didn't come out right but I was responding to the poster that said you loose the grounding or it would be compromised. I was trying to say if you had a wire EGC the grounding is not compromised.
 
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