What must a supply-side bonding jumper comply with when enclosed separately?

When a supply-side bonding jumper is installed in a manner where it is enclosed separately from other conductors, it can indeed be smaller than the derived ungrounded conductors. This allows for flexibility in the sizing of bonding jumpers while still meeting safety requirements.

The bonding jumper's primary function is to create a low-impedance path to ground, which aids in minimizing the possibility of electrical shock and enhances fault current performance. The size of the bonding jumper may be determined by factors such as the size of the conductors it is meant to bond, but it is not mandated to be larger in those scenarios. This reflects an understanding of how bonding and grounding systems can be designed effectively to ensure safety without necessitating oversized bonding conductors when specific installation conditions, such as separate enclosure, are in place.

Understanding this aspect of grounding and bonding practices is critical in ensuring compliance with electrical standards, while also maintaining efficient and safe designs in electrical systems.