In a non-metallic box not larger than 2 1/4" x 4", cable clamps are not needed if the NM cable is stapled within what distance of the box?

The correct answer is based on the National Electrical Code (NEC) requirements, which dictate how non-metallic (NM) cables must be secured to boxes. In residential electrical installations, the code allows for certain exceptions regarding the need for cable clamps in specific situations.

When NM cable is stapled within 8 inches of a non-metallic box that has specific dimensions, it is considered securely fastened, and the use of clamps is not necessary. This provision is designed to simplify installation while still ensuring the safe and secure positioning of the cable, reducing unnecessary materials and labor.

Understanding the distances is critical for electricians to comply with safety standards and ensure that installations are both efficient and compliant with code requirements. In this instance, following the 8-inch guideline helps to maintain the integrity and safety of the electrical system without compromising security or adherence to necessary regulations.