What is the distance that the nearest edge of a hole should be from the nearest edge of a wood joist when installing Type NM cable?

The correct distance from the nearest edge of a hole to the nearest edge of a wood joist when installing Type NM cable is 1 1/4 inches. This guideline is established to ensure that the NM cable is adequately protected from potential damage. If the cable is too close to the edge of the joist, it may be at risk of being exposed to nails or screws that could puncture the insulation, leading to electrical hazards.

The 1 1/4 inch distance serves as a safety margin to protect the cable from physical stress and to comply with building codes that govern electrical installations. Adhering to this standard prevents installation issues and enhances overall safety in electrical work, ensuring that the wiring remains functional and protected throughout its lifespan. Following this requirement also contributes to maintaining regulatory compliance and ensuring that installations meet best practices in construction and safety.