HOLT Electricians Practice Exam

Which wiring method is allowed for a surface extension from a cover and must include an equipment grounding conductor?

1. Rigid

2. Flexible

3. Nonmetallic

4. Conductive

The correct answer is: Flexible

The correct response to the question regarding the wiring method that must include an equipment grounding conductor for a surface extension from a cover is flexible wiring. Flexible wiring is designed to accommodate movement and can be easily routed in varying conditions. It is particularly beneficial in applications where the installation needs to adapt to environmental factors or where the wiring could be subject to physical stress. When using flexible wiring for surface extensions, including an equipment grounding conductor is essential for safety. The equipment grounding conductor serves as a path for electrical fault currents to ensure that any excess current due to faults is directed safely to the ground, helping to prevent electrical shocks and improving overall system safety. This requirement aligns with various electrical codes and safety standards that prioritize protecting individuals and equipment from electrical hazards. While rigid, nonmetallic, and conductive methods may have their applications, they do not specifically encompass the same level of flexibility and adaptability that is often required in installations needing a surface extension, reinforcing why flexible wiring is the most appropriate choice.