When the system bonding jumper for a separately derived system is installed at the first disconnecting means enclosure, to what must it connect the grounded conductor?

When the system bonding jumper for a separately derived system is installed at the first disconnecting means enclosure, it serves an essential role in ensuring the safe operation of the electrical system. The jumper connects the grounded conductor to various grounding components to help establish a solid system ground.

Connecting the grounded conductor to the ground rod is crucial as it provides a direct path for fault currents to dissipate into the earth, thereby reducing the risk of electric shock and equipment damage. Additionally, connecting it to the power source allows for a clear reference point, ensuring that any faults can properly operate protective devices. The connection to the equipment grounding conductor is also vital, as it ensures that any fault currents have a low-impedance path back to the source, which facilitates the operation of overcurrent devices.

Therefore, the system bonding jumper effectively integrates these elements, ensuring safety and compliance with electrical codes by connecting the grounded conductor to the ground rod, the power source, and the equipment grounding conductor. This comprehensive bonding helps to mitigate potential hazards and promotes the safe operation of the electrical system.