Was there an oversite? PVC Sch-40

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BAHTAH

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PVC-Sch-40 that is sunlight resistant is allowed to be exposed where not subject to physical damage. As an example if you install a surface N3R panel on the exterior of a building, you could use PVC-Sch40 to run down to an LB and enter the building interior.
I am wondering if there was an oversite with respect to the use of PVC to protect NMB as it appears only PVC-Sch-80 can be used where a PVC type of conduit is installed for protection of NMB.
 
grant said:
PVC-Sch-40 that is sunlight resistant is allowed to be exposed where not subject to physical damage. As an example if you install a surface N3R panel on the exterior of a building, you could use PVC-Sch40 to run down to an LB and enter the building interior.
I am wondering if there was an oversite with respect to the use of PVC to protect NMB as it appears only PVC-Sch-80 can be used where a PVC type of conduit is installed for protection of NMB.
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Your answer is in your own question, for your example on a exterior panel "Where not subject to physical damage" if it is subject to physical damage you need to use Sch-80. If you are using PVC for the protection on NM cable what are you protecting it from ? Answer "Physical damage" so you would need Sch-80. :smile:
 
Yeah.. what acrw10 said! You also might want to look at the 2008 code. Any conduit exposed to the weather is considered as a wet location. You can't install NM is even short sections.
 
is that panel protected ??? schd. 40 will be fine ,.. gotta do something about the nm-b though
 
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acrwc10 said:
If you are using PVC for the protection on NM cable what are you protecting it from ? Answer "Physical damage" so you would need Sch-80. :smile:
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Pvc-Sch40 installed on the exterior of building as a raceway where physical damage is not an issue is allowed by the NEC. The same raceway installed under the same conditions would not be allowed for the protection of NMB even though the conduit was not subject to physical damage which means the NMB would not be damaged within the PVC-Sch-40.
 
Why can't you just run UF or NMC or SE on the outside surface of the building without a raceway? That should be allowed if it isn't subject to physical damage. What is subject to damage is a very grey area. I think many inspectors let sch 40 PVC go on the exterior (especially LB's and short segments of conduit) whereas they wouldn't let exposed cable run in that same location. So they are just inconsistent. Either it is or it isn't subject to damage. If it is, then you're stuck with sch80 regardless of what is run inside it (or you need to provide other means to protect sch 40).
 
grant said:
Pvc-Sch40 installed on the exterior of building as a raceway where physical damage is not an issue is allowed by the NEC. The same raceway installed under the same conditions would not be allowed for the protection of NMB even though the conduit was not subject to physical damage which means the NMB would not be damaged within the PVC-Sch-40.
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I was thinking PVC used inside for protecting NM, like in a hight below or go through a floor, not outside though.
 
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