Services & DistributionQuestion 71 of 521
At other than dwelling units, service equipment must be legibly field-marked with:
a.The utility transformer size
b.The maximum available fault current and the date the calculation was performed
c.The service voltage only
d.The rating of the largest branch circuit
Explanation
Section 110.24 requires service equipment to be field-marked with the maximum available fault current, including the date of the calculation, and updated if modifications change that value. The transformer size, voltage, or branch-circuit rating alone do not satisfy this marking.
Law Reference: 2023 NEC §110.24Practice all 521 questions free — no signup required.
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