Electrical from house to detached garage

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Posted by: from Airdrie
8/1/2017 at 10:08:26 AM

I'm running 8/3 form house to garage for sub panel. I have about 20 feet going inside and 25 feet outside. NMD is for inside NMWU is for outside. Do you/can you run NMWU inside house as well to keep it one continuous wire or do I change cable outside in box and change to NMD to go in house.

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Jarrod from JTB Electric Ltd. in Camrose
Date/Time8/1/2017 at 12:04:09 PM

Yes you can run nmwu inside the house. Its better to have a continuous run of nmwu rather than multiple splices.

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Tyler from Monster Electric in Edmonton
Date/Time8/1/2017 at 12:15:09 PM

You can run NMWU in the house with no problem. You can also splice to NMD in the fitting you use to penetrate the building envelope as sometimes turning 20' of wire in fitting can be quite laborious!

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Date/Time8/1/2017 at 4:43:12 PM

NMWU is fine inside as well.


Topline Power Systems

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Robert from ElecTriLight Ltd. in Oakville
Date/Time8/1/2017 at 7:25:03 PM

Hey Jeff, as others have said, fewer splices, the better off you are. The NMWU is a thicker jacket on not only the outer sheath, but also every conductor, which sounds great for direct burial, but remember it does not dissipate heat as easily as the NMD, so be sure not to run it near ducting or heating pipes.

Where it exits the home, be sure no to bend the cable more than a 3" radius as this will weaken the insulation and could cause weak/hot spots in the cable.

Don't forget the cable must be buried 18" (inches) deep and have some sand protecting it from sharp rocks and trench fill, also marker tape within 6" of the finished grade below the surface marked "buried cable below" etc the entire length of the trench.

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