The grounded service-supplied alternating current system shall have an ______ main bonding jumper used to connect EGC to the grounded conductor.

• A. soldered
• B. spliced
• C. unsliced
• D. crimped

Answer: (C)

The main bonding jumper is the continuous path that ties the grounded conductor (neutral) to the grounding-electrode conductor at the service equipment, creating a solid bond between the system’s neutral and the earth. To keep this bond reliable, the jumper must be a single, uninterrupted piece of conductor. An unsliced jumper provides a low, consistent impedance path with no joints that could loosen, corrode, or fail over time. Joints such as soldered, spliced, or crimped connections introduce potential failure points and higher resistance, which can compromise the bond and the system’s fault-current path. So the best choice is an unsliced main bonding jumper.