Dịch vụ & Phân phốiCâu 70 / 521
A feeder is protected by a 100 A overcurrent device. Using Table 250.122, the minimum size copper equipment grounding conductor is:
a.12 AWG
b.10 AWG
c.8 AWG
d.6 AWG
Giải thích
Table 250.122 lists an 8 AWG copper equipment grounding conductor for circuits protected at 100 A. A 10 AWG is the value for 60 A, and 6 AWG is for larger ratings up to 200 A, so both miss the 100 A row.
Trích dẫn luật: 2023 NEC §250.122Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- A service is supplied with 3/0 AWG copper service-entrance conductors. Using Table 250.66, the minimum size copper grounding electrode conductor is:
- 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:
- At other than dwelling units, service equipment must be legibly field-marked with:
- 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:
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