What is the primary material difference between metallic and non-metallic flexible conduit?

The primary material difference between metallic and non-metallic flexible conduit lies in the presence of internal metal ribs. Metallic flexible conduits are constructed with a metal lining that provides durability, strength, and a certain level of protection against environmental factors. These internal metal ribs also contribute to the conduit’s ability to maintain structural integrity while allowing for flexibility in installation. This characteristic is particularly important in applications where the conduit needs to bend or maneuver around obstacles without compromising safety or performance.

In contrast, non-metallic flexible conduits typically lack these internal metal ribs, making them lighter and more resistant to corrosion, but they are generally less robust than their metallic counterparts. The absence of metal ribs also affects other properties such as overall flexibility and resistance to certain environmental stresses.

Understanding this fundamental difference helps in selecting the appropriate type of conduit based on the specific requirements of an electrical installation, including environmental factors and the need for physical protection of the wiring within the conduit.