Final answer:
Electrical cables must be at least 1¼ inches from the edge of a stud to be considered protected, or they must be shielded with strike plates or nail plates.
Step-by-step explanation:
The depth at which cables are considered protected from the edges of studs depends on building codes and regulations, usually found in the National Electrical Code (NEC). Generally, electrical cables need to be installed at least 1¼ inches from the edge of a stud or framing member when passing through holes or running along the member. If this is not possible, protective steel plates known as strike plates or nail plates must be used to shield the cable from potential harm, such as nails and screws during construction or renovations.