Services & DistributionCâu 31 / 110
What is the maximum number of service disconnecting means permitted for a single set of service-entrance conductors (each in a separate enclosure)?
a.One
b.Four
c.Six
d.Eight
Giải thích
A service is limited to a maximum of six disconnecting means. In the 2023 NEC each of the up-to-six disconnects must be in a separate enclosure or be part of listed equipment.
Trích dẫn luật: 2023 NEC 230.71Luyện miễn phí toàn bộ 110 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- A service uses #2/0 Cu ungrounded conductors. What is the minimum copper grounding electrode conductor?
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- A feeder is protected by a 400-A overcurrent device. What is the minimum copper equipment grounding conductor?
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- Service phase conductors total 1,500 kcmil Cu per phase (over 1,100 kcmil). Using the 12.5% rule, what is the minimum copper main bonding jumper?
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