At what point in the circuit should the protective device be located?

The protective device is most effective when located as close to the power source as possible. This positioning allows for the immediate disconnection of the power supply in the event of a fault, such as a short circuit or overload. By being near the source, the protective device can quickly detect an abnormal condition and react swiftly to prevent damage to the wiring and connected equipment, reducing the risk of fire or electrical hazards.

When placed farther from the power source, the protective device may take longer to respond to faults, allowing potential damage to occur in the circuit before disconnection. Additionally, the risk of injury or equipment failure increases as the resistance along the wiring can affect the performance of the protective device. Therefore, having it placed near the source ensures optimal protection and enhances overall circuit safety.