HOLT Electricians Practice Exam

A fused switch should not have fuses connected in which configuration?

1. Series

2. In parallel

3. Disconnected

4. None

The correct answer is: In parallel

A fused switch should not have fuses connected in parallel configuration because doing so can create a situation where one fuse may not operate as intended. When fuses are connected in parallel, the current is divided among them. If one fuse blows, the circuit continues to be energized through the remaining fuses, potentially leading to an overload on those fuses, which may not be rated to handle the full circuit load. This is particularly dangerous as it can lead to overheating and possibly cause a fire hazard. Additionally, parallel fuses can give a false sense of security—if one fuse blows, users may assume the circuit is safe while, in actuality, it remains energized. Understanding the proper configuration of fuses within a switch is crucial for ensuring circuit safety and the functionality of protective devices. Series fuses, on the other hand, ensure that all fuses must operate properly for the circuit to function, thereby providing effective protection against overloads.