An electrical conduit is a tube used to protect and route electrical wiring. PVC conduit is the lightest in weight compared to other conduit materials, and usually lower in cost than other forms of conduit. The plastic material resists moisture and many corrosive substances. PVC conduit may be heated and bent in the field, by using special heating tools designed for the purpose. Since PVC conduit has a higher coefficient of thermal expansion than other types, it must be mounted to allow for expansion and contraction of each run. Care should be taken when installing PVC underground in multiple parallel run configurations due to mutual heating effect of density packed cables, because the conduit will deform when heated. Conduit systems are classified by the wall thickness, mechanical thickness and material used to make tubing.
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