Will be doing a service riser in PVC. It will have a couple of bends in it. I was picked up once for not installing a expansion joint because the riser had bends. The inspector showed me the article but of course I can’t remember it now can anyone help me out here?
Expansion couplingon pvc service riser
- Thread starter jaykilty
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It’s 2 fixed points that require the expansion fitting, if your conduit runs straight up, even with a saddle in the middle, to the weatherhead no expansion is required.
If you hit a bend that changes direction of the pipe run you have to have one.
If you hit a bend that changes direction of the pipe run you have to have one.
- Location
- New Jersey
- Occupation
- Journeyman Electrician
For PVC its 352.44.
Yup I will have a change in direction. Any idea of the article? I don’t see that in 352.44
- Location
- Illinois
- Occupation
- retired electrician
Depending on the location of the supports on each side of a 90° bend and the amount of calculated expansion or contraction, the 90 can be used as the expansion device.
- Location
- Placerville, CA, USA
- Occupation
- Retired PV System Designer
But if the adjacent side of the 90 is supported closely, the 90 itself has to be considered as a fixed point at the end of a straight run.
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How can that be considered a fixed point when using expansion clips which are required as far as I know
Cow
Senior Member
- Location
- Eastern Oregon
- Occupation
- Electrician
It's worth mentioning, that if your install dictates an expansion fitting, it goes without saying you need straps/supports capable of allowing the conduit to slip.
Using regular strut straps or similar is a no go.
Using regular strut straps or similar is a no go.
kwired
Electron manager
- Location
- NE Nebraska
- Occupation
- EC
If you have a horizontal run that is subject to thermal expansion/contraction of more than 1/4 inch, an elbow or conduit body that makes a vertical deflection can be allowed to move and no additional expansion fitting is necessary, but if after making that vertical deflection the next support on the vertical portion is so close to the elbow/conduit body that it effectively secures the elbow or conduit body from horizontal movement - then you still need additional expansion fitting on the horizontal portion of the run - hope that makes sense.
- Location
- Placerville, CA, USA
- Occupation
- Retired PV System Designer
Expansion clips allow motion parallel to the conduit run, not perpendicular to it. When I said "adjacent side" I was referring to the side of the 90 perpendicular to the run in question.
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