Where must a system bonding jumper connection be made in a separately derived system?

In a separately derived system, the system bonding jumper connection must be made at any point up to the first disconnecting means or overcurrent device. This requirement ensures that the grounding of the system is effectively bonded to the grounding system of the supply source, providing a clear path for fault currents and improving safety.

Bonding in this context is crucial because it helps to ensure that all metallic parts of the system have the same electrical potential, minimizing the risks of shock hazards. The bonding jumper is a vital element that connects the grounding conductors of the separately derived system to the grounding system of the building or structure.

By making the connection up to the first disconnecting means or overcurrent device, you ensure that the entire system is integrated properly within the overall electrical safety protocols, adhering to the National Electrical Code (NEC) requirements that govern grounding and bonding practices. This also ensures maintenance personnel can easily locate and access the bonding jumper for inspection or maintenance without risking disruption to the rest of the system.