The purpose of connecting the main bonding jumper is to ___.

• A. minimize shock hazard
• B. provide an effective path for ground-fault current
• C. lead stray currents away from the equipment
• D. minimize static electricity

Answer: (B)

Creating a low-impedance path for ground-fault current is what the main bonding jumper does. By bonding the grounding electrode system to the service equipment grounding path, it ensures that if a live conductor contacts exposed metal, there is a direct, low-resistance route for fault current back to the source. That quick return allows the protective device to trip promptly, minimizing the chance of shock or ongoing exposure to a fault. While proper bonding also contributes to safety, the core purpose is to enable the fault current to flow effectively to clear the fault. Stray currents and static electricity aren’t the primary functions of this jumper.