NM to EMT transtion

[harvero]

If you run NM cable to a wall mounted box and if you want to protect the section of cable that is ran on the wall with EMT, what is the best way to protect the cable as it enters the EMT? I know that is would be best to mount a junction box and transition from the NM to THHN/THWN, but sometimes running the NM directly into the EMT makes for a much cleaner and simpler installation. What I wonder about is the use of these NM to EMT connectors.

They are UL listed, but I wonder if you use them, does this then make your EMT a close conduit system, and then you would be required to de-rate the wire. So the 12AWG NM would not be rated for 20 amps then?

 

[rockwithjason]

for a single cable in emt derating will not be a factor. you DO have to make sure the emt is bonded to ground at some point whether it's in a box attached to the emt on the far side or a bonding jumper and an approved grounding clamp.

 

[pattenp]

Use an EMT bushing and staple the NM within 12" of where it enters the EMT.

 

[Mustang51js]

as far as i know the only way to do it is with the connector you posted or by putting a j-box at the end of the pipe. i wouldnt pass inspection if i put a bushing at the end of the pipe,and never actually seen it done that way.

 

[pattenp]

I've see installs done where NM is run above the top wall plate and dropped down to surface mounted boxes using EMT down to the outlet box. Where the NM enters the EMT above the top of the wall an EMT bushing is used and the wire is stapled within 12" of the conduit end. As far as the NEC goes, it meets requirements.

 

[malibu101]

I've see installs done where NM is run above the top wall plate and dropped down to surface mounted boxes using EMT down to the outlet box. Where the NM enters the EMT above the top of the wall an EMT bushing is used and the wire is stapled within 12" of the conduit end. As far as the NEC goes, it meets requirements.

I too have seen this many, many times in new construction that passes inspections.

I think there is something about the conduit can't be over a certain length when used this way.
But I'm not sure.

 

[shooting4life]

I've see installs done where NM is run above the top wall plate and dropped down to surface mounted boxes using EMT down to the outlet box. Where the NM enters the EMT above the top of the wall an EMT bushing is used and the wire is stapled within 12" of the conduit end. As far as the NEC goes, it meets requirements.

This is what I did in my garage, works great. I just used the little red rubber things inside the EMT opening and stapled the NM within a few inches.