Flexible conduit is used to protect cable and wire from direct sun contact and other enviornmental effects.Intermediate metal conduit (IMC) is a steel tubing heavier than EMT but lighter than RMC. It may be threaded. Electrical metallic tubing (EMT), sometimes called thin-wall, is commonly used instead of galvanized rigid conduit (GRC), as it is less costly and lighter than GRC.
Right—conduit does not equal cable. However, sometimes flexible conduit is a constituent part of cable. To put it another way, sometimes flexible conduit and individual conductors are prefabricated into cable. For example, the cladding of metal-clad cable is equivalent to flexible metal conduit (FMC).