At what voltage level is it necessary to wear arc coveralls?

Wearing arc coveralls is mandated for safety when working with equipment that operates at higher voltage levels due to the increased risk of electrical arcs, which can cause severe burns and injuries. The specific threshold established for the requirement of arc-rated clothing is above 30 volts. This standard is in place because electrical arcs become more prevalent and dangerous at this voltage, requiring protective gear to mitigate the risk of harm to personnel.

While voltages below 30 volts are generally considered low enough to pose a lesser risk, it is the point at which the potential for arc flash incidents increases significantly. Thus, the correct answer highlights the critical voltage level where specific personal protective equipment, such as arc coveralls, becomes necessary to ensure the safety of those working in environments where electrical hazards may be present.