Dịch vụ & Phân phốiCâu 62 / 521
What is the minimum rating of the service disconnecting means for a one-family dwelling?
a.100 A
b.60 A
c.200 A
d.125 A
Giải thích
For a one-family dwelling, the service disconnecting means must be rated not less than 100 A, 3-wire. The 60 A rating applies to smaller occupancies such as certain limited loads, while 200 A and 125 A are common but not the code-required minimum.
Trích dẫn luật: 2023 NEC §230.79Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- A service uses 600 kcmil copper ungrounded conductors. Per Table 250.66, what is the minimum copper GEC?
- A feeder is protected by a 60 A overcurrent device. Per Table 250.122, what is the minimum copper EGC?
- A service supplies a continuous load of 80 A and a noncontinuous load of 100 A. What is the minimum required ampacity of the service-entrance conductors?
- For a single service, the maximum number of service disconnects permitted for each service permitted by 230.40 is:
- Overload protection for service-entrance conductors must be provided by an overcurrent device in series with:
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