If single-gang, nail-on, nonmetallic boxes are used with NM cable, which of the following is TRUE regarding grounding conductor connections?

If single-gang, nail-on, nonmetallic boxes are used with NM cable, which of the following is TRUE regarding grounding conductor connections?

• A. No grounding conductor connection to the box is required.
• B. Grounding conductor must be connected to the box at all times.
• C. Grounding conductors must be sized separately for each box.
• D. Each box requires a separate ground connection to the panel.

Answer: (A)

When using single-gang, nail-on, nonmetallic boxes with nonmetallic (NM) cable, the correct understanding is that there is no requirement to connect a grounding conductor to the box. This is because nonmetallic boxes are not conductive and do not serve as a grounding element in the electrical system. The NM cable itself typically includes a grounding conductor which is sufficient for providing ground protection to devices within the box. Since these types of boxes are designed to isolate the electrical components from any conductive path to ground, additional connections to the box are unnecessary. It simplifies the installation while maintaining compliance with grounding and bonding requirements, as the grounding needs are effectively met within the NM cable assembly itself.

When using single-gang, nail-on, nonmetallic boxes with nonmetallic (NM) cable, the correct understanding is that there is no requirement to connect a grounding conductor to the box. This is because nonmetallic boxes are not conductive and do not serve as a grounding element in the electrical system. The NM cable itself typically includes a grounding conductor which is sufficient for providing ground protection to devices within the box.

Since these types of boxes are designed to isolate the electrical components from any conductive path to ground, additional connections to the box are unnecessary. It simplifies the installation while maintaining compliance with grounding and bonding requirements, as the grounding needs are effectively met within the NM cable assembly itself.