Dịch vụ & Phân phốiCâu 27 / 521
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?
a.110 A
b.125 A
c.115 A
d.150 A
Giải thích
Per 240.4(B), when the conductor ampacity does not correspond to a standard rating and is 800 A or less, the next higher standard device (125 A) is permitted. 115 A is not a standard size, 110 A is unnecessarily lower, and 150 A skips past the next standard.
Trích dẫn luật: 2023 NEC §240.4(B)Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- Using the 60 C column of Table 310.16, what is the ampacity of a 6 AWG copper conductor?
- What is the maximum overcurrent protection allowed for a 12 AWG copper conductor under the small-conductor rule?
- Which of the following is NOT a standard ampere rating for a fuse or inverse-time breaker per 240.6(A)?
- 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?
- As a general rule, where must overcurrent protection for a conductor be located?
Cập nhật gần nhất: · quy trình kiểm tra
Đội Ngũ Biên Tập PrepPass · Đối chiếu với California CSLB C-10 Electrical Trade Examination · Quy trình kiểm tra