Ever wonder why the PVC conduit run on the side of a building is all wavy and looks awful, it’s because the installer probably forgot to include an expansion fitting. Per NEC section 352.44 PVC conduit requires an expansion fitting where the PVC pipe is expected to move 1/4″ or more. Here in So. Florida the PVC is expected to move approximately 2.64″ based on our average temperature range.
See the attached link on how to install one of these fittings. http://0323c7c.netsolhost.com/docs/Conduit%20expansion%20fittings.pdf
Till next time.
Be safe, work safe
Jake