Dịch vụ & Phân phốiCâu 30 / 521
As a general rule, where must overcurrent protection for a conductor be located?
a.At the point where the conductor receives its supply
b.At the load end of the conductor
c.Within 25 ft of any panel
d.Anywhere along the run
Giải thích
Per 240.21, overcurrent devices must generally be placed where the conductor receives its supply (its origin). Tap rules are specific exceptions; there is no general rule allowing load-end or arbitrary placement.
Trích dẫn luật: 2023 NEC §240.21Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- A conductor has an allowable ampacity of 115 A that does not match a standard fuse size. The load is 112 A. What is the largest standard OCPD permitted?
- For circuits rated over 800 A, what is the rule for the overcurrent device relative to conductor ampacity?
- A service uses 3/0 copper conductors at 75 C (200 A ampacity) with a 200 A load. What is the correct standard OCPD?
- Why is a service disconnect required to be readily accessible and located near the point of entrance of the service conductors?
- A branch circuit carries a continuous load of 80 A. What minimum OCPD rating is required?
- Using the standard 3 VA/sq ft general lighting unit load, what is the general lighting load for a 2,000 sq ft dwelling (before demand factors)?
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