Dịch vụ & Phân phốiCâu 71 / 521
At other than dwelling units, service equipment must be legibly field-marked with:
a.The utility transformer size
b.The maximum available fault current and the date the calculation was performed
c.The service voltage only
d.The rating of the largest branch circuit
Giải thích
Section 110.24 requires service equipment to be field-marked with the maximum available fault current, including the date of the calculation, and updated if modifications change that value. The transformer size, voltage, or branch-circuit rating alone do not satisfy this marking.
Trích dẫn luật: 2023 NEC §110.24Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- At a grounded AC service, the grounded (neutral) conductor run to the service disconnecting means must be sized:
- The main bonding jumper in service equipment serves to:
- A feeder is protected by a 100 A overcurrent device. Using Table 250.122, the minimum size copper equipment grounding conductor is:
- The interrupting rating of an overcurrent device must be:
- The short-circuit current rating (SCCR) of equipment such as a panelboard means the equipment can:
- In general, conductors may be connected in parallel (electrically joined at both ends) only where the individual conductors are:
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