What is the maximum gap allowed around boxes employing a flush-type cover in noncombustible surfaces?

For flush-type covers installed on noncombustible surfaces, the National Electrical Code specifies that the maximum allowable gap around the box is 1/8 inch. This requirement ensures that there is a minimal space between the cover and the surface, providing both safety and aesthetic benefits. Keeping the gap small helps to prevent dust, debris, or moisture from entering the electrical box, which can lead to electrical hazards or equipment failures. Additionally, a snug fit contributes to a more finished appearance, important for maintaining the integrity and professionalism of electrical installations. Understanding this specification is crucial for compliance with the NEC and for ensuring safe electrical practices.