When should nonmetallic conduits be avoided?

Nonmetallic conduits should be avoided in gas stations primarily due to safety concerns related to the handling of flammable materials. At gas stations, the risk of exposure to gasoline and other volatile substances is present. Nonmetallic conduits, such as PVC, may not provide the same level of protection from fire or explosion risks as metallic conduits. In environments where flammable vapors are common, the use of metallic conduits is preferred because they can help contain any potential electrical faults and reduce the risk of ignition.

Additionally, while nonmetallic conduits may be appropriate in various applications such as residential wiring or agricultural areas, gas stations present unique hazards that necessitate the use of materials that can withstand more extreme conditions and offer enhanced protective capabilities. Therefore, it is crucial to consider the specific environment and the potential risks involved when selecting conduit materials for electrical installations.