Is a supply-side bonding jumper required to be sized based on the overcurrent protective device protecting the circuit?

A supply-side bonding jumper does not need to be sized based on the overcurrent protective device protecting the circuit. Instead, it must be appropriately sized according to specific guidelines provided in the National Electrical Code (NEC) and other regulatory standards. The primary purpose of the bonding jumper is to ensure electrical continuity and conductivity among equipment, providing a low-resistance path for fault currents.

This conductor is typically sized based on the size of the service-entrance conductors and the system it's serving, not directly on the rating of the overcurrent protection, which can vary based on many factors such as the load characteristics, equipment ratings, and installation conditions. Therefore, the statement that a supply-side bonding jumper must be sized based on the overcurrent protective device is not accurate, making the answer that it is false correct in this context.

In contrast, other considerations, like voltage levels or application types (e.g., residential versus commercial), do not alter the fundamental requirement that the sizing is dictated by the system and NEC guidelines rather than the overcurrent protection ratings.