Services & DistributionQuestion 88 of 521
A supply-side bonding jumper on the line side of the service, used to bond service raceways and enclosures, is generally sized based on:
a.The equipment grounding conductor Table 250.122
b.The service conductors, using Table 250.102(C)(1)
c.The branch-circuit rating
d.The grounding electrode conductor only
Explanation
Per 250.102(C), a supply-side bonding jumper is sized from Table 250.102(C)(1) based on the size of the ungrounded service conductors (with proportional rules for parallel/large conductors). Table 250.122 is for load-side equipment grounding conductors, not supply-side bonding.
Law Reference: 2023 NEC §250.102Practice all 521 questions free — no signup required.
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