EMT Conduit Question

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  #1  
Old 03-10-14, 12:21 PM
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EMT Conduit Question

I recently installed a new circuit in my garage. I ran EMT 1/2 inch conduit from the garage wall, where the wiring enters the garage, to the outlets it powers. I did NOT strip the outer sheathing away from my 12-2 NM wiring before running it through the conduit. Now that it's installed and working, I've read a few places that you're supposed to strip away that outer sheating. The reason being given is that the 12-2 NM wiring may overheat due to being sealed inside the metal conduit.

My question is, do I need to re-visit my project and remove the outer sheathing? Or should I be okay as is?

Other info: The circuit is dedicated to the garage, 20 amp breaker, and is only feeding GFCI outlets. Everything is indoors, no dampness in my garage. I've grounded the outlet boxes to the wiring and used a tester to ensure the GFCIs are wired properly and open as expected. However, I'm pretty new to this DIY work, so let me know if something sounds off.

Thanks!
 
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  #2  
Old 03-10-14, 01:39 PM
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Conduit with cable installed inside it is typically done for physical protection against damage as a sleeve. You could have used individual conductors in a complete conduit system.

Stripping the sheath off removes the listing of NM cable and means it no longer meets the code requirements.
 
  #3  
Old 03-10-14, 05:00 PM
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Although the NEC doesn't prohibit running NM cable in conduit, it's not a normal practice and some jurisdictions will not allow it because it's a cable assembly. It's also the mark of an inexperienced DIYer and not a professional.
 
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Old 03-10-14, 06:16 PM
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Is this an attached or detached garage?
 
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Old 03-10-14, 08:31 PM
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Attached garage.

CasualJoe - What type of wire should I have used in the conduit? And yes, I'm an inexperienced DIYer. Thanks!
 
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Old 03-10-14, 08:40 PM
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THHN wire would be fine in a complete conduit system.
 
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Old 03-10-14, 08:56 PM
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OK I have to ask, what is the difference between if the sheath is removed from NM cable and THHN?
 
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Old 03-10-14, 08:59 PM
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THHN is labeled. The conductors inside NM are not.
 
  #9  
Old 03-11-14, 09:02 AM
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THHN wire would be fine in a complete conduit system.
There are other types of wire also acceptable, but THHN is the most widely accepted and available wire to use.
 
  #10  
Old 03-12-14, 09:03 AM
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Okay, easy enough. Thanks for the advice everyone!
 
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