Dịch vụ & Phân phốiCâu 63 / 521
For a single service, the maximum number of service disconnects permitted for each service permitted by 230.40 is:
a.Two
b.Three
c.Four
d.Six
Giải thích
Section 230.71 permits up to six service disconnects for each service; in the 2023 NEC each must be in a separate enclosure, or be part of listed switchgear/switchboard/metering assemblies. The lower numbers are not the code limit.
Trích dẫn luật: 2023 NEC §230.71Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- 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?
- What is the minimum rating of the service disconnecting means for a one-family dwelling?
- Overload protection for service-entrance conductors must be provided by an overcurrent device in series with:
- A feeder supplies a continuous load of 40 A and a noncontinuous load of 60 A. The minimum feeder conductor ampacity before applying any adjustment factors is:
- A feeder overcurrent device protecting a feeder that supplies continuous loads must have a rating not less than:
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