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Old 03-05-2010, 01:14 AM   #1
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MC cable through conduit

Hi there,

I'm planning the addition of a 50A sub panel in my detached garage and was hoping to get a code reference for what I'm planning in case the inspector asks when I go for the permit.

I want to run about 20' of #6 MC cable from the service panel through the crawl space and into 1.5" schedule 80 conduit which will buried +18" for another 35' to the garage. The conductors in the MC cable are rated XHHW.

My question is how do I transition into conduit when under the house? It seems silly to cut the cable just to use a j-box but it seems kind of ticky-tacky to just have the cable running into the nipple on the back of the LB. A couple hours at the library with the NEC book was no help.

The only reason I was planning to run MC the whole distance was because I got it for quite a bit less than the individual conductors would have cost but I suppose I can just unwind the jacket if necessary. Thanks in advance for any help,
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Old 03-05-2010, 06:15 AM   #2
Just call me Andrew
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I'm not sure if you can run MC inside conduit. IF so, I think the conduit should be oversized for heat dissipation purposes. The other guys here will know for sure.

I know romex is only supposed to go in conduit for short distances, not entire runs.

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Old 03-05-2010, 08:09 AM   #3
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I'm not sure on the MC in conduit
Specifically the wire inside needs to be wet rated for burial in conduit
Pretty sure that wire is not wet rated...and you will get rust fairly quickly

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Old 03-05-2010, 10:38 AM   #4
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330.10 Uses Permitted.
(A) General Uses. Type MC cable shall be permitted as
(1) For services, feeders, and branch circuits
(2) For power, lighting, control, and signal circuits
(3) Indoors or outdoors
(4) Exposed or concealed
(5) To be direct buried where identified for such use
(6) In cable tray where identified for such use
(7) In any raceway
(8) As aerial cable on a messenger
(9) In hazardous (classified) locations as permitted
(10) In dry locations and embedded in plaster finish on brick
or other masonry except in damp or wet locations
(11) In wet locations where any of the following conditions
are met:
a. The metallic covering is impervious to moisture.
b. A lead sheath or moisture-impervious jacket is provided
under the metal covering.
c. The insulated conductors under the metallic covering
are listed for use in wet locations.
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Scuba_Dave (03-05-2010), secutanudu (03-05-2010), StudebakerHawk (03-05-2010)
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