Master Electrician Practice Exam

What must be connected to equipment grounding conductors in a central vacuum assembly located adjacent to a laundry room?

1. Live current-carrying parts

2. Current-carrying conductors

3. Accessible non-current-carrying metal parts

4. Metal fixtures within the assembly

The correct answer is: Accessible non-current-carrying metal parts

The correct answer involves the necessity of connecting accessible non-current-carrying metal parts to equipment grounding conductors in a central vacuum assembly, particularly because the assembly is situated near a laundry room. This is critical for ensuring safety and minimizing electrical hazards. When appliances or devices are located in environments like laundry rooms, where moisture may be present, the risk of electrical shock increases. Accessible non-current-carrying metal parts can inadvertently become energized if there is a fault in the system. By connecting these parts to the equipment grounding conductors, any stray voltage can be safely directed to the ground, preventing shock hazards to users. Moreover, grounding non-current-carrying metal parts helps in conforming to the National Electrical Code (NEC) requirements, reinforcing safe practices in electrical installations. Equipment grounding conductors provide a low-resistance path to ground that ensures the protective devices (like circuit breakers) can operate effectively in the event of a fault, thus enhancing overall safety in electrical installations. This connection does not encompass live current-carrying parts or the current-carrying conductors themselves, as grounding and bonding are focused on ensuring that any non-current-carrying metal parts maintain a safe and neutral state. Metal fixtures within the assembly may not necessarily require grounding