Which type of conduit is suitable for use in a corrosive environment?

Plastic coated RMC (Rigid Metal Conduit) is the most suitable choice for use in a corrosive environment. The plastic coating provides an additional layer of protection against corrosive elements, such as moisture, chemicals, and other environmental hazards. This coating helps to prevent rust and deterioration that can compromise the integrity of the conduit over time.

In environments where exposure to corrosive substances is a concern, using materials that can withstand such conditions is critical. The plastic coating ensures that the metal conduit underneath is protected, extending its lifespan and maintaining the safety and reliability of electrical installations.

Other conduit types, while they may offer some level of protection, do not provide the same level of defense against corrosion as plastic coated RMC. For example, galvanized steel can resist rust to some extent due to its zinc coating, but it is not entirely immune to corrosion in harsh environments. Rigid PVC is non-metallic and inherently resistant to many corrosive substances, but it lacks the structural integrity of metal conduits for heavy-duty applications. Flexible metal conduit is not generally recommended for corrosive environments since its metal nature can lead to rusting unless it's also coated. Thus, plastic coated RMC stands out as the most suitable option for such conditions.