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taskmasters

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.

Diatonic254

The answer is Rigid-metal

Rigid metal conduit is heavy-duty galvanized steel tubing that is typically used outdoors to provide protection from damage. It provides structural support for electrical panels, cables, and mast. Another important advantage of zinc- based rigid metal conduit is that it has no temperature limitations. IMC and EMC are lighter-weight versions of rigid metal conduits and can be bent easily using conduit benders. These two metals are not the best for mast installations.