What must be done before performing work on high voltage circuits?

Before performing work on high voltage circuits, it is essential that the circuit is de-energized and visibly disconnected. This step is crucial for ensuring the safety of personnel who will be working on or near the electrical components. De-energizing the circuit eliminates the risk of electric shock, which can be fatal, and ensures that there is no live electricity present that could lead to accidents.

Visibly disconnecting the circuit helps verify that it is not only turned off but also physically separated from its power source. This might include removing fuses, opening switches, or using other safety lockout/tagout procedures to prevent accidental re-energization while work is being performed. This practice aligns with safety regulations and industry best practices, emphasizing the importance of providing a secure working environment.

Testing for voltage, covering and securing the circuit, or inspecting for wear, while they are important steps in overall safety protocols, do not replace the critical requirement of de-energizing and visibly disconnecting the circuit when performing maintenance or repair work.