What thickness must sheet steel be for a metal box as specified by the NEC®?

The National Electrical Code (NEC®) specifies that metal boxes used in electrical installations must be made of steel with a minimum thickness to ensure safety and reliability. According to the NEC, the minimum thickness for sheet steel for a metal box is indeed 0.053 inch. This thickness is designed to protect the electrical components inside the box and provide sufficient strength to withstand bending or cracking during installation and operation.

The requirement for this specific thickness helps ensure that the box remains structurally sound under various conditions it may encounter, such as physical impact or environmental factors. Adequate thickness is important for maintaining the integrity of the electrical system, preventing potential hazards like short circuits or electrical shocks that could arise from damaged or compromised boxes.

In summary, the established thickness of 0.053 inch aligns with NEC regulations to promote safety and durability in electrical installations.