Which of the following is an example of a common electrical safety precaution?

In the context of electrical safety precautions, disconnecting battery power before working on electrical systems is essential for several reasons. First and foremost, it eliminates the risk of accidental electrical shock while handling or repairing components. Without power, the likelihood of short circuits, which can lead to burns, fires, or damage to sensitive electronic components, is significantly reduced.

Moreover, disconnecting the battery helps to avoid unintended activation of systems that could pose safety risks, such as ignition of fuel systems or operation of motors. By ensuring that the electrical system is de-energized, technicians can work more safely and confidently, focusing on repairs without the fear of electrical hazards.

While wearing protective eyewear, using heavier gauge wire, and grounding the aircraft during thunderstorms are all important safety practices, they do not directly address the immediate risks associated with working on live electrical systems. Therefore, disconnecting battery power is the most appropriate and critical electrical safety precaution in this scenario.