In installations not exceeding 100 cu in., what is the requirement for screws entering wiring spaces?

In installations where the volume of the box does not exceed 100 cubic inches, the requirement for screws entering wiring spaces is that they must be flush with the box interior. This provision is established to ensure safety and accessibility within the box, preventing any possible obstruction of wiring or electrical components. If screws were to protrude into the wiring space, they could potentially damage the insulation of wires or create a pathway for arcing, which poses a fire hazard.

By having screws that are flush, it allows for wires to be installed and routed within the box without interference. This is particularly important in maintaining the integrity of the electrical connections and ensuring that there is enough space for the wiring to be safely housed within the box. This requirement helps uphold the overall safety standards set forth by the National Electrical Code, ensuring that installations remain reliable and safe for use.