If branch-circuit wiring in conduit is installed within building walls, how is it classified?

When branch-circuit wiring is installed within building walls, it is classified as concealed wiring. This classification is due to the nature of the installation, where the wiring is hidden behind wall surfaces, such as drywall or plaster, making it not readily visible or accessible for inspection without opening up the wall.

Concealed wiring is significant in ensuring aesthetic appeal and protecting wiring from physical damage while adhering to safety and building codes. This classification also influences the type of materials and installation methods that must be used, as concealed wiring requires compliance with specific regulations to ensure that it is adequately protected and that the installation is conducted safely.

In contrast, visible wiring refers to wiring that is apparent and easily seen, exposed wiring is where the wires are not hidden and are accessible without removing barriers, and accessible wiring refers to wiring that can be reached and worked on without needing structural alterations. Therefore, the distinction as concealed wiring accurately reflects its placement within the walls, aligning with industry standards and practices.