When installing conduit for a mast service, what type of conduit should you use?

a. EMT

b. Rigid-metal

c. IMC

d. Rigid-nonmetal

The answer is (b) Rigid-metal

If you are installing a conduit for a mast service, the type of conduit to be used should be a rigid metal type. Among the three types of steel conduit, the most preferable to install is the rigid metal type instead of an intermediate metal conduit and electrical metallic tubing. Rigid metal conduit is a ferrous metal.