What must each outlet box have in completed installations?

Each outlet box must be equipped with a cover, faceplate, or canopy in completed installations to ensure safety and compliance with electrical codes. The primary function of these components is to provide a protective barrier that covers the wiring connections and prevents accidental contact with live wires. This is critical for reducing the risk of electrical shocks and possible short circuits. Furthermore, these covering elements contribute to a neat and finished appearance by concealing openings in the wall and ensuring that the installation adheres to building codes and standards regarding electrical safety.

While inspection stickers, base mounts, and lighting fixtures are relevant in specific contexts, they are not universally required for the completion of every outlet box installation. The necessity of a cover, faceplate, or canopy is a fundamental requirement in electrical work, aimed at safeguarding both the installation and the occupants of the space.