When cables and nonmetallic raceways are installed parallel to framing members, what is the minimum distance from the nearest edge of the framing where nails or screws might penetrate?

The minimum distance of 1 1/4 inches from the nearest edge of the framing for cables and nonmetallic raceways is specified to provide a safeguard against physical damage that could be caused by nails or screws. When installation occurs parallel to framing members, this distance helps to ensure that nails, screws, or other fasteners used in securing the framing do not unintentionally penetrate the cables or raceways, potentially leading to electrical hazards or failures.

This specification is rooted in the NEC's goal of enhancing safety and reliability within electrical installations. The requirement for the 1 1/4 inch distance strikes a balance between operational practicality and the need for protection against inadvertent damage. Adequate spacing ensures that trade professionals can work effectively without compromising the integrity of the electrical system.