Probable Effect Concentration Quotients (PECQS) Practice Test

What is required where the disconnecting means is mounted on removable truck panels?

1. An isolette switch

2. An isolating switch

3. Automatic circuit breakers

4. Ground-fault switches

The correct answer is: An isolating switch

When disconnecting means are mounted on removable truck panels, an isolating switch is required to ensure safe and convenient disconnection of electrical circuits. The isolating switch provides a reliable means to isolate the electrical supply from the load, enabling maintenance or repair work to be conducted safely without the risk of accidental re-energization. The use of an isolating switch is critical in applications involving removable panels because it helps maintain safety standards by preventing unintentional contact with live circuits. It effectively isolates the electrical system when the panel is removed, ensuring that personnel can work safely without exposure to electrical hazards. While other devices like automatic circuit breakers, ground-fault switches, and isolette switches have their specific roles in electrical safety and protection, they do not serve the primary purpose of isolating power in the context of removable truck panels as effectively as an isolating switch.