pvc schedule 80

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Smart $ said:
TTBOMK there are no specifically-for schedule 80 fittings. Schedule 80 PVC conduit uses the same fittings as Schedule 40 conduit.
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I agree, since the outside diameter of the PVC is the same for both. The only fittings that would be different would be something that went into the PVC if there even is such a product available.
 
JFletcher said:
http://www.alliedeg.us/wp-content/uploads/2014/09/pvc-fittings.pdf

They fit schedule 40 and 80 PVC tho the LBs dont appear to have a schedule rating. I would assume they are therefore suitable for either.
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I'm guessing your assumption is correct. If you look at the differences in thickness between 2" SH 40 and 80 PVC, the OD's remain the same but the ID's change.
  • 2" SH 40 OD-ID = 2.375"OD-2.021"ID = 0.354"/2= 0.177" wall thickness
  • 2" SH 80 OD-ID = 2.375"OD-1.881"ID = 0.494"/2= 0.247" wall thickness
Now, if you look at the specs for a 2" LB
  • 2" LB OD-ID = 3.188"OD-2.375"ID = 0.831"/2= 0.4065" wall thickness
I don't have a 2" LB in front of me so I can't verify that this is correct. I'm assuming the mfr's specs are correct. If my math is off would someone please correct me

What I have experienced in the past is a difference in gray PVC tones with schedule 80 and associated fittings. Your installation is going on the outside of a building and you want your installation to look good. Having dark gray PVC with a light gray PVC-LB and light gray PVC straps doesn't look good to me, IMHO.
 
infinity said:
I agree, since the outside diameter of the PVC is the same for both. The only fittings that would be different would be something that went into the PVC if there even is such a product available.
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One fitting that probably should have a schedule 80 version, is the PVC end bell. Because the schedule 40 version still leaves the sharp inner edge of the schedule 80 conduit exposed to cause abrasion on the wires, and protecting against sharp edges is the entire purpose of the end bell.

I could see the issue arise if an inspector doesn't think standard PVC fittings are officially durable enough, for an application where schedule 80 is required. Even though most if not all PVC fittings will fit both schedules, they don't all come with a documented dual rating for sch80/sch40, and there is no blanket rule that makes this dual rating standard by design.
 
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