How should a bonding jumper be sized?

A bonding jumper should be sized based on the current-carrying capacity required by the bonding application. This ensures that the jumper is capable of safely carrying the maximum expected fault current without overheating or becoming a failure point.

In grounding and bonding practices, the purpose of the bonding jumper is to create a low-resistance path for electrical currents, which helps prevent dangerous voltage differentials. By sizing it according to the stipulated current-carrying capacity, the jumper will facilitate adequate fault protection and ensure compliance with safety regulations.

The other options do not adequately address the essential criteria for sizing a bonding jumper. For example, while voltage rating and equipment type may influence certain design aspects, they do not directly translate to the fundamental requirements of current-carrying capabilities. Similarly, the length of the wiring might affect some performance characteristics, but it is not the primary factor in determining the size of the bonding jumper. Focus on current capacity helps ensure the effectiveness and reliability of the bonding system in safeguarding both equipment and personnel.