If branch-circuit wiring to a receptacle is installed in the building walls, how is the wiring considered?

When branch-circuit wiring to a receptacle is installed within the building walls, it is classified as concealed wiring. This terminology is used because the wiring is hidden from direct view by being enclosed within the structural elements of the building, such as drywall or wall studs. In terms of safety and code compliance, concealed wiring helps to protect the electrical conductors from damage and prevents accidental contact, which is why it is subject to specific regulations in electrical codes.

Concealed wiring is critical for ensuring the integrity of the electrical system, as it reduces the likelihood of tampering and makes the installation safer. This classification also implies that such wiring must be installed in accordance with applicable codes and standards to ensure it functions correctly and safely throughout the life of the building. Understanding the characteristics of concealed wiring is essential for ensuring proper installation and maintenance within electrical practices.