In which situations is the use of rigid metal conduit (RMC) preferred?

The preference for using rigid metal conduit (RMC) in industrial settings or locations with heavy physical abuse is primarily due to its robust construction and ability to withstand harsh environmental conditions. RMC is designed to provide superior protection for electrical wiring against mechanical impact, moisture, and other hazardous conditions encountered in such environments.

In industrial applications, equipment and machinery often create risks of physical damage, making the durability of RMC essential. Additionally, RMC can also offer grounding benefits, which are important in environments where electrical safety is a top priority.

The other scenarios do not necessitate the use of RMC to the same extent. For example, in residential settings with minimal physical abuse, more flexible conduit options are typically sufficient and can be easier to work with. Underground installations may have specific considerations, and while RMC can be used, it is not exclusive to that application. Finally, while RMC can be employed in areas where PVC is prohibited, this is not a primary indicator of its preferred use; rather, it should be selected based on the specific conditions it needs to withstand.