Services & DistributionQuestion 90 of 521
Ground-fault protection of equipment is generally required for solidly grounded wye services of more than 150 V to ground but not exceeding 1000 V phase-to-phase, where the service disconnect is rated:
a.1000 A or more
b.400 A or more
c.100 A or more
d.2000 A or more
Explanation
Per 230.95, ground-fault protection of equipment is required on such services where the service disconnecting means is rated 1000 A or more. The other ampere thresholds do not match the code trigger for this GFP requirement.
Law Reference: 2023 NEC §230.95Practice all 521 questions free — no signup required.
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