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Old 08-17-2011, 02:58 PM   #1
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Default mc to emt

being new to the site, and a little pc challanged, I hope I am going about this correctly...I do mostly Maintenance work at an old hydro plant. I don't get much field work so I am a little rusty when it comes to the code. I was wondering if there is a way to transition from mc cable to emt when comming from floor joists down a block wall for outlets and switches with no j box ? thanks

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Old 08-17-2011, 03:10 PM   #2
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Quote:
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being new to the site, and a little pc challanged, I hope I am going about this correctly...I do mostly Maintenance work at an old hydro plant. I don't get much field work so I am a little rusty when it comes to the code. I was wondering if there is a way to transition from mc cable to emt when comming from floor joists down a block wall for outlets and switches with no j box ? thanks
what size mc to what size conduit?
if you are using MC that fits a 3/8" mc connector to 1/2 " emt there is connection just for , anything else say for 3/4" emt you would need a 3/4" rigid coupling with an RE to accept the MC connector

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Old 08-17-2011, 03:11 PM   #3
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Old 08-17-2011, 03:11 PM   #4
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connector ,rigid coupling,threaded mc connector, anti short, skin the mc long enough to go through conduit to first j-box or to point of termination.
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Old 08-17-2011, 03:13 PM   #5
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A rigid coupling ,emt connector
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Old 08-17-2011, 03:28 PM   #6
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Quote:
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A rigid coupling ..........
Quote:
Originally Posted by JDJ View Post
......,rigid coupling,.......
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Originally Posted by electricalwiz View Post
.....rigid coupling......
110.3(B) violation.
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Old 08-17-2011, 04:49 PM   #7
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a rigid coupling ,emt connector

Wrong!!!!
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Old 08-17-2011, 04:51 PM   #8
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Originally Posted by JDJ
connector ,rigid coupling,threaded mc connector, anti short, skin the mc long enough to go through conduit to first j-box or to point of termination.
That's against code. They sell an adt. At most supply houses we call them "from to" I don't no if that's what there really called for sure but the supply house always knows what we want

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Old 08-17-2011, 04:54 PM   #9
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Quote:
Originally Posted by 480sparky

110.3(B) violation.
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Originally Posted by oldtimer

Wrong!!!!
Good to see that there are other people on here that no better then to do that

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Old 08-17-2011, 06:32 PM   #10
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Ok so which item is not being used as it's labeled use? Maybe the rigid, coupling so replace with a pulling condulet. I have seen the above mentioned way of transitioning many times in inspected jobs and never seen it fail.
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Old 08-17-2011, 06:45 PM   #11
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110.3(B) violation.
I don't see it

Listed or labeled equipment shall be installed and used in accordance with any instuctions included in the listing or labeling.

were does the listing exsist for rigid couplings that says you cant do this?


110.3 (B) does not require listing.
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Old 08-17-2011, 07:07 PM   #12
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I'm sorry, I'm not one to be negative, but pulling out that card is a total crock. I am sorry. I'm not a smart man by any means, but I'd be the first to say BS right there.

That's worse than calling exposed SEU hazardous.

I understand listings, but you tell me you would never do it, and I'll call you ignorant or a liar.

Who's first?
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Old 08-17-2011, 07:25 PM   #13
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Looking at a few products at Arlington and Bridgeport, most of what we traditionally use is either for NM or FMC. There was one for MC, but duplex.
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Old 08-17-2011, 07:33 PM   #14
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I think the rigid to emt coupler problem is rigid is used with tapered threads vs straight threads for emt/mc connectors.
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Old 08-17-2011, 07:38 PM   #15
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I've never been called using a rigid coupling.

Anti-shorts not required unless required locally.
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Old 08-17-2011, 07:45 PM   #16
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I've never been called using a rigid coupling.

Anti-shorts not required unless required locally.

I'd honestly like to hear of anyone hit for that. Again, I understand the listings but give me a break on that one.........
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Old 08-17-2011, 07:48 PM   #17
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What am I missing? A "from 2" connector would work here wouldn't hit? The MC jacket isn't the EGC so why not?
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Old 08-17-2011, 07:51 PM   #18
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I agree with most here, I don't see that as a violation using the rigid coupling but what do I know
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Old 08-17-2011, 08:03 PM   #19
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Quote:
Originally Posted by nrp3
I think the rigid to emt coupler problem is rigid is used with tapered threads vs straight threads for emt/mc connectors.
Then I guess you've never ran greenfield to EMT before. Thinking comes from not knowing.
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Old 08-17-2011, 08:09 PM   #20
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I have done both flex and mc to emt and the question wasn't whether it will physically bolt together and work, but whether it was legal or not. If not, then what was the proper coupler to use. I don't think its a major transgression, but I try to use the right stuff if I can.

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