Which of the following is NOT a method of electrical safety?

Testing equipment under load is not considered a method of electrical safety because it involves working with live electrical components and can present significant risks. In contrast, the other methods listed focus on measures that help prevent accidents and protect workers from electrical hazards.

Using personal protective equipment (PPE) is crucial as it provides a barrier between the worker and electrical sources, reducing the risk of electric shock or arc flash. De-energizing circuits before performing any work on them is a fundamental safety practice that ensures there is no live current that could cause harm. Maintaining proper clearance from energized lines is essential for avoiding accidental contact with live electrical sources, which could result in injury or fatalities.

By utilizing these safe practices, workers significantly minimize risk while working with or around electrical systems. Hence, testing equipment under load is contrary to the principles of electrical safety.