MC to EMT fitting

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iwire said:
It's been discussed to death, Joe T will tell you it is a violation, I do not agree.
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I noticed that after that "Discussion" Joe T has only commented on this sight infrequently. :roll:
 
iwire said:
IMO going down that road also means we can not strip NM to go into panels.
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You lost me here. If the job is inspected the inspector will see the NM/conductors before they enter the panel. So after that why would the marking need to be seen ? If it did you would have to run more then 1/4" of the jacket into the box. No one should be changing the breaker size on a wire when they come onto an old job based on the markings on the jacket any how.
 
M. D. said:
My only concern with this set up is ,.. that it has not been evaluated for it's ability to reliably handle a fault current ..
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All three parts have been evaluated for carrying fault current.

Unless your saying when I assemble a raceway that I have to have UL evaluate each raceway evaluated for it's ability to handle fault current.
 
M. D. said:
Not sure they have in this configuration ,.. I have found that they are a crappy connection , and loosen quite easily , JMO
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If someone forgets to tighten a setcrew on one of those fancy changeover fittings you end up with a "crappy" connection too. Installation error is never a reason to condemn a particular method.
 
tkb said:
What about the marking on the wires?
Is'nt this why NM can't be striped and the conductors used?
I know this has been discussed to death.
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iwire said:
IMO going down that road also means we can not strip NM to go into panels.
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Sorry I miss read the post, I thought you were saying you can't strip the NM for the short run after the transition ( in a NM to EMT fitting )
 
M. D. said:
Not sure they have in this configuration ,.. I have found that they are a crappy connection , and loosen quite easily , JMO
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I find a lot of things that have passed grounding test appear to have poor connections.

Push in MC connectors and reducing washers come to mind but both pass ground fault testing
 
iwire said:
I find a lot of things that have passed grounding test appear to have poor connections.

Push in MC connectors and reducing washers come to mind but both pass ground fault testing
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The difference is that they have been tested ...and the results evaluated. The connection that concerns me most ,.. it is the connector to coupling . I have found many loose ones ,.not sure why ,.. just sharing what I have seen ...

So everyone knows ,..that while I would rather use a box ,.I have and will , most likely,.. use these fittings in this same way ..
I'm just not sure the connections provide for a good fault current path .. so I will avoid it most of the time.
 
M. D. said:
I'm just not sure the connections provide for a good fault current path
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I can not for the life of me understand that. :smile: :confused:

You look at a push in MC connector and accept it passed the tests, but you see two threaded connections and you have doubts? :confused:

I also do not understand why a combination of three parts to make up a change over needs more testing then a combination of a 50 parts in a entire raceway. :confused:


IMO if you put a home made changeover on the test stand it would pass. :smile:
 
I have had more than one inspector give me the hairy eyeball - saying that exposed threads inside the RMC couplings I usually use to make such fitting combo's will damage the conductors. Yet the same would not blink same fuzzy orb with 2 chase nipples in an RMC coupling.

As for the fault carrying debacle - the fittings would not be carrying fault current in an NM situation unless that fault were at the set-screws of said NM connector. In either cable type the fault current would be carried by the EGC accompanying the cable. And as far as I remember, the jacket of MC is not allowed to be the sole EGC.
 
thanks aftershock someone on the same page as me same with sealtite etc i usually put a c condulet lb or whatever suits
 
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