Emt sleeve
- Thread starter fjm
- Start date
- Status
- Location
- Massachusetts
I do it all the time.
Speedskater
Senior Member
- Location
- Cleveland, Ohio
- Occupation
- retired broadcast, audio and industrial R&D engineering
If all the current carrying conductors go through the EMT, then it doesn't act as a "choke".
captainwireman
Senior Member
- Location
- USA, mostly.
I would think there are applications where this would be required.
300.4 A,C,D
Also,
300.15 F
300.4 A,C,D
Also,
300.15 F
Then you also have to comply with...
EMT and its fittings do not qualify, and I don't know of any securing means that qualify either. Guess what that leaves... :blink:
Of course, for the overly pendantic, there is no requirement that MC actually be connected to boxes, cabinets, or other equipment. :?
EMT and its fittings do not qualify, and I don't know of any securing means that qualify either. Guess what that leaves... :blink:
Of course, for the overly pendantic, there is no requirement that MC actually be connected to boxes, cabinets, or other equipment. :?
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John120/240
Senior Member
- Location
- Olathe, Kansas
The fitting on the cable entry end must be a listed and identified MC cable termination type. 330.30 lists fitting without elaboration, but should be interpreted with the following part, "or other cable termination", to mean a cable termination fitting. AFAIK, this is the only type of fitting that can be associated directly with MC cable :happyyes:. 330.40 confirms the interpretation.
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J.P.
Senior Member
- Location
- United States
I do that on panels with lots of mc coming in. Right from the rack to the chase, it makes it look so much neater.
I use PVC though, but I don't think that part matters.
I use PVC though, but I don't think that part matters.
- Occupation
- Licensed Electrician
I went back and forth through this thread and I can't make heads or tails of it.
IMO you can transition from MC to EMT without splicing to individual conductors in a j box but you have to use a listed MC fitting at the point of transition... 330.40.
Smart $ referenced 330.40 and I agree, then he also said something about EMT only being less than 12"...huh?
I think you can go as far as you want with the EMT, or wiremold etc... I think this is what iwire meant.
IMO you can transition from MC to EMT without splicing to individual conductors in a j box but you have to use a listed MC fitting at the point of transition... 330.40.
Smart $ referenced 330.40 and I agree, then he also said something about EMT only being less than 12"...huh?
I think you can go as far as you want with the EMT, or wiremold etc... I think this is what iwire meant.
You can go as far as you want provided there is a listed MC fitting terminating the MC, as a cable (the cable terminates wherever the sheath is stripped from the conductors), and secured within 12" of the fitting on the cable side. There is no Code which requires the conductors be terminated at any distance beyond the fitting.
If you transition to EMT without a listed MC fitting, you must secure the cable within 12" of the cabinet, box, [less listed MC fitting], or other cable termination... thus limiting the EMT to a maximum of 12", unless you somehow manage to secure the MC cable within the EMT at 12" or less from its entry into the cabinet, box, or other cable termination. There is no Code section which actually requires an MC connector. The closest I can think of at present are 312.5 and 314.17... and 312.5(C) actually states cables must be secured to the cabinet. But neither outright state a cable connector must be used.
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- Location
- Massachusetts
I am just going to say that thankfully it seems not a single inspector in all of New England sees it like Smart. 
I have mentioned many times that cable methods are the most common around here and as such we change over to EMT all the time. Could be 100s of times on a single job.
I think most people would say the intent of securing the cable to the box is satisfied with securing the cable to the raceway.
In reality we never receive true 'special permission' but I think the inspectors feel the objectives have been met.
I have mentioned many times that cable methods are the most common around here and as such we change over to EMT all the time. Could be 100s of times on a single job.
I think most people would say the intent of securing the cable to the box is satisfied with securing the cable to the raceway.
In reality we never receive true 'special permission' but I think the inspectors feel the objectives have been met.
- Occupation
- Licensed Electrician
Got it. Agreed.
I had never considered this, probably won't ever do it. Interesting thought though.
curt swartz
Electrical Contractor - San Jose, CA
- Location
- San Jose, CA
- Occupation
- Electrical Contractor
Bob, I'm confused by what your are saying. Are you transitioning from MC to EMT with a connector? Or are you just pushing the MC through the EMT with out any type of connector? If the later how do you bond the MC jacket and how do you protect the wires from the cable jacket?
- Location
- Massachusetts
Yes.
Heck no. :happyno:
I get upset enough when I see guys use electrical tape to hold the anti-short in place insulating the armor from the connector.
We do it a number of ways.
A changeover fitting, sometimes listed for the purpose but sometimes not.
A box or wireway with no splices in it.
And yes, even making changeover fittings with a conduit coupling.
curt swartz
Electrical Contractor - San Jose, CA
- Location
- San Jose, CA
- Occupation
- Electrical Contractor
To me it sounds like the OP and some of the other posters were suggesting it was ok just to change from MC to EMT without any type of connector. I thought you were endorsing this method but its obvious your are not and you do the correct way.
- Location
- Massachusetts
Could be
I would have no issue with sliding unstripped MC through a short section of EMT as a sleave without any connecters at either end.
I would have no issue with sliding unstripped MC through a short section of EMT as a sleave without any connecters at either end.
curt swartz
Electrical Contractor - San Jose, CA
- Location
- San Jose, CA
- Occupation
- Electrical Contractor
I would not either if the EMT was just a sleeve and the MC exited the EMT then entered a box with the proper connector.
I was picturing a switch box mounted on the wall with a shore section of EMT from the box to the ceiling. The MC was then pushed through the EMT to the box. I would require a transition connector at the EMT.
PetrosA
Senior Member
- Location
- Lancaster, Pennsylvania
I admit, I was understanding the OP and iwire (until he clarified himself) to be describing sleeving unstripped MC through a piece of EMT (which would be attached to a JB or enclosure) and poking the MC into said box or enclosure, stripping the end, and landing the wires without an MC connector. Even if code did allow this, why would you do it that way? That's nasty sounding. I know guys do this with NM, but NM jacket won't cut into the wires. MC will. Ugh, Now I'm having visions of drunk homeless people doing electrical work.
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