Final answer:
A supply side bonding jumper is used in grounding separately derived AC systems to connect the equipment grounding conductor to the grounding electrode conductor. This helps provide a proper grounding path and prevents electrical shock hazards and excessive voltage.
Step-by-step explanation:
When it comes to grounding separately derived alternating-current (AC) systems, a supply side bonding jumper is an important component. It is used to connect the equipment grounding conductor at the grounded service conductor to the grounding electrode conductor at the supply end. This ensures a proper grounding path and helps to prevent electrical shock hazards and excessive voltage. The supply side bonding jumper ensures that fault currents are directed towards the grounding electrode system, allowing the protective devices to quickly trip and isolate the fault.