Services & DistributionQuestion 77 of 521
For a 200 A single-phase dwelling service, the minimum aluminum service-entrance conductor permitted by the dwelling service conductor provisions is:
a.1/0 AWG copper
b.3/0 AWG aluminum
c.4/0 AWG aluminum
d.250 kcmil copper
Explanation
Section 310.12 (dwelling services and feeders) permits 4/0 AWG aluminum for a 200 A single-phase dwelling service. 3/0 aluminum is undersized for 200 A, while the copper options are permitted but are not the minimum aluminum answer asked for.
Law Reference: 2023 NEC §310.12Practice all 521 questions free — no signup required.
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