Expansion Fitting- Asphalt

[Always4]

Is it typical to install PVC expansion fitting on conduits protruding vertically from asphalt? The inspector claims they are needed for thermal expansion. I can’t find anything in the NEC specifically relating to asphalt. We are currently still on 2017 code cycle.

Background-
-Perviously installed- 2” PVC underground Service conduit has an expansion fitting

-Installing- 1- 1 1/2” and 1- 3/4” conduit
-Terminates in a PVC junction box 8” above grade. It will likely require relocating box as there isn’t much space for an expansion fitting.

 

[infinity]

Expansion fittings are typcially used for two reasons, 1) expansion/contraction of PVC conduit and 2) earth movement.

At only 8" of raceway 1) would not apply.

Regarding 2) will the conduit be able to move after installation? {300.5(J)}

 

[Always4]

It comes out of the trench and within of 8” of grade enters a junction box. There is no support between grade and the box due to the proximity to ground level. I believe that answers your question.

 

[infinity]

It comes out of the trench and within of 8” of grade enters a junction box. There is no support between grade and the box due to the proximity to ground level. I believe that answers your question.

The question is will there be potential for settling or earth movement that may affect the PVC. If yes then the expansion fitting is required, if not then it's not required.

300.5(J) Earth Movement.
Where direct-buried conductors, raceways, or cables are subject to movement by settlement or frost, direct-buried conductors, raceways, or cables shall be arranged so as to prevent damage to the enclosed conductors or to equipment connected to the raceways.