ICC Residential Electrical Inspectors Practice Exam

NM cable running parallel with stud framing shall be installed not less than what distance from the edge of studs unless physically protected?

1. 0.5 inches

2. 1 inch

3. 1.25 inches

4. 2 inches

The correct answer is: 1.25 inches

NM cable, or non-metallic sheathed cable, is commonly used in residential electrical installations. When running parallel to stud framing, it is essential to maintain a specific distance from the edges of the studs to ensure safety and compliance with the National Electrical Code (NEC). The requirement to install NM cable at a distance of not less than 1.25 inches from the edge of the studs is crucial for several reasons. This distance helps prevent damage to the cable from screws, nails, or other fasteners that may be used in the construction of walls. If the cable is too close to the edge of the stud, the risk of accidental penetration is increased during any subsequent installation of drywall, trim, or other materials that involve attaching items to the framing. By adhering to the specified 1.25 inches distance, electricians ensure that the cable remains protected and minimizes the likelihood of electrical hazards such as short circuits or damaged wiring. This requirement is in place to promote both safety and longevity of the electrical installations in residential properties, establishing a clear standard that helps inspectors assess compliance during evaluations.