SafetyQuestion 444 of 521
The purpose of the main bonding jumper at a service is to:
a.Connect two separate service panels together
b.Bond the neutral bar only to the ground rod
c.Connect the equipment grounding conductor/metal enclosure to the grounded (neutral) conductor at the service
d.Carry the lighting load for the building
Explanation
The main bonding jumper ties the equipment grounding system and service enclosure to the grounded (neutral) conductor at the service, completing the fault path back to the source. It is not a tie between two panels, not merely a neutral-to-rod link, and it never carries normal load current.
Law Reference: 2023 NEC §250.24Practice all 521 questions free — no signup required.
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