UF Cable in conduit

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  #1  
Old 07-19-16, 07:25 PM
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UF Cable in conduit

There seems to be some confusion about running UF cable in conduit. Can someone please clarify:

1. Is it ok to run UF cable in conduit?
2. Can it be PVC or metal? Is choice determined by depth of burial?
3. Is there any downside to putting UF in conduit? I've read mixed reports about effecting heat dissipation, etc - To me it seems like putting it in conduit just adds protection.

Thanks
 
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Old 07-19-16, 07:59 PM
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1. Yes, but it is a PITA
2. Plastic is best for direct burial. Metal will rust.
3. Other than being a PITA, no downside. There is really no reason to except to raise the depth needed (24" vs. 18") There is no heat to dissipate. You are right it does add protection.
I would run individual THWN wire in the conduit. Much easier to do.
 
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Old 07-19-16, 08:05 PM
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Yes, you CAN run type UF through either plastic or metallic conduit you must run it through conduit for physical protection where it enters the earth.

BUT, you have to have LARGE conduit and plenty of lubricant as type UF is extremely hard to pull through conduit.

IF you use rigid conduit (like water pipe in thickness) you can get away with burying it six inches deep in most cases. If you use intermediate or any plastic conduit it generally needs to be buried a minimum of 18 inches although there are some exceptions.

Downside to using type UF in conduit is the need for larger conduit (more money) and the significantly more work to install for (in my opinion) zero gain. If you are going to run conduit anyway it is best to then run type THWN (or THHN/THWN) individual conductors. Much, much easier to work with than UF.
 
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Old 07-20-16, 04:21 AM
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Thanks for the answers - You confirmed and clarified what I thought. Appreciate it
 
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