Which of the following can be a disadvantage of not using properly rated meter leads?

Not using properly rated meter leads can indeed lead to the potential for equipment failure. Meter leads are designed to handle specific voltage and current ratings, and using leads that are not rated for the application can cause several issues. For example, if the leads are rated for lower voltage or current than the circuit being tested, they may overheat, break down, or even fail completely. This can not only damage the leads themselves but also potentially cause damage to the equipment being tested as well as present safety hazards to the technician using them.

Properly rated meter leads ensure that measurements are taken safely and accurately, and they protect both the equipment and the technician from electrical hazards. Thus, using meter leads that do not meet the required specifications can have serious repercussions, including equipment failure.