Boxes in electrical installations may have which type of covers?

In electrical installations, the covers for boxes are typically made of metal for several important reasons. Metal covers provide excellent durability and strength, effectively protecting the wiring and connections inside the box from physical damage, environmental factors, and accidental contact. This enhances safety, particularly in environments where electrical connections may be exposed to impact or other stresses.

Metal also has conductive properties that can assist in grounding; in cases of fault conditions, a metal cover can help ensure that any stray electrical charges are safely directed away, preventing potential electric shock hazards. Furthermore, many electrical codes and standards require the use of metal covers in certain installations to meet fire safety regulations and to ensure the integrity of the electrical system.

While plastic, wood, and glass covers might have specific uses in other contexts, they do not provide the same level of protection, grounding capability, or compliance with industry standards associated with electrical installations. This makes metal the preferred and often required choice for covers in these applications.