Services & DistributionQuestion 10 of 521
When the grounded (neutral) service conductor is run to the service disconnect, its minimum size is based on which table?
a.Table 250.102(C)(1), sized from the ungrounded service conductors
b.Table 250.122, sized from the OCPD
c.Table 310.16 only
d.Table 250.66, sized from the GEC
Explanation
Per 250.24(C), the grounded conductor brought to the service must not be smaller than required by Table 250.102(C)(1), based on the largest ungrounded service conductor. It is not sized from the OCPD (that is the EGC in 250.122) nor from the GEC table.
Law Reference: 2023 NEC §250.24(C)Practice all 521 questions free — no signup required.
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