Services & DistributionQuestion 69 of 521
The main bonding jumper in service equipment serves to:
a.Connect the grounded conductor to the service equipment enclosure
b.Connect two grounding electrodes together
c.Bond the metal water pipe to the gas pipe
d.Provide overcurrent protection for the neutral
Explanation
Per 250.28, the main bonding jumper connects the grounded (neutral) conductor to the equipment grounding conductor and metal enclosure at the service, establishing the fault-return path. It is not a jumper between electrodes, a piping bond, or any form of overcurrent protection.
Law Reference: 2023 NEC §250.28Practice all 521 questions free — no signup required.
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- At a grounded AC service, the grounded (neutral) conductor run to the service disconnecting means must be sized:
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