Which application is EMT allowed to be used in?

The correct choice indicates that EMT (Electrical Metallic Tubing) is permissible for use in both exposed and concealed locations. This versatility in installation is one of the defining characteristics of EMT, making it a popular choice for electrical conduit systems. EMT can be utilized in a variety of environments due to its lightweight nature and corrosion-resistant properties when properly installed.

When used in exposed locations, EMT provides a level of accessibility that facilitates easy maintenance and alterations to the electrical system. In concealed locations, it still serves the purpose of protecting conductors from physical damage while allowing for neat and organized wiring. This ability to be effective in both scenarios is crucial in commercial and residential applications, where conduit may be hidden within walls or ceilings or visible in areas such as basements, garages, or parking structures.

Additionally, EMT is typically not suited for areas where it will face severe physical damage or where protection from corrosion relies solely on enamel, as these applications usually demand more robust materials. The limitations of EMT in specific contexts further reinforce why its allowable use in both exposed and concealed positions is a significant advantage.