What should be checked before performing a voltage test?

Before performing a voltage test, it is essential to ensure that the circuit is de-energized and safe for testing. This step is crucial to protect both the technician conducting the test and the equipment involved. Ensuring the circuit is de-energized minimizes the risk of electric shock, accidental short circuits, and potential damage to the equipment.

Additionally, working on energized circuits without proper precautions can lead to serious injuries or fatalities. Following safety protocols, such as using appropriate personal protective equipment (PPE) and verifying the absence of voltage with appropriate testing tools, is fundamental to conducting electrical work safely.

The other options, while related to electrical testing, do not directly address the immediate risk of conducting tests on a live circuit. Checking the resistance of the circuit is a practice that may happen during certain types of testing but does not take precedence over confirming safety. Testing voltage with a live wire contradicts the safety protocols needed during such work. Likewise, checking the amperage rating of the circuit is relevant for load assessments but does not ensure safety before conducting a voltage test. Therefore, making sure that the circuit is de-energized is the most critical first step.