Lập kế hoạch & Dự toánCâu 410 / 521
For a set of service-entrance conductors, the service disconnecting means is generally limited to a maximum of how many switches or circuit breakers?
a.2
b.4
c.6
d.8
Giải thích
The service disconnecting means is limited to a maximum of six switches or circuit breakers for a given set of service conductors. Modern code also requires them to be in separate enclosures, but the six-disconnect limit still governs.
Trích dẫn luật: 2023 NEC §230.71Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
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