What is the maximum gap allowed at the edge of any fitting or box that is repaired for non-combustible surfaces?

The maximum gap allowed at the edge of any fitting or box that is repaired for non-combustible surfaces is established to ensure safety and proper containment of electrical components. A gap of 1/8 inch is generally allowed because it minimizes the risk of arcing or exposure that could lead to electrical faults or hazards. This smaller gap also helps in maintaining the integrity of the installation, preventing any potential debris or dust from entering the fittings which could compromise their performance or lead to overheating.

The requirement reflects industry standards aiming to provide a safe environment where electrical connections do not create unsafe conditions. By adhering to this 1/8 inch specification, electricians ensure that the installation remains within the guidelines set by the National Electrical Code (NEC) and other safety regulations, thereby promoting both functionality and safety in electrical systems.