Dịch vụ & Phân phốiCâu 9 / 521
Service-entrance conductors are 3/0 AWG copper. Per Table 250.102(C)(1), what is the minimum copper main bonding jumper?
a.6 AWG
b.4 AWG
c.2 AWG
d.8 AWG
Giải thích
The main bonding jumper is sized from Table 250.102(C)(1) based on the service conductors; for 2/0-3/0 copper it is 4 AWG copper. 6 AWG and 8 AWG are too small, and 2 AWG is not required until conductors exceed 3/0.
Trích dẫn luật: 2023 NEC §250.28Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- What is the minimum length that a ground rod electrode must be in contact with the soil?
- A single ground rod is installed. Under what condition is a supplemental electrode NOT required?
- A ground ring is used as a grounding electrode. What is the minimum size and length required?
- When the grounded (neutral) service conductor is run to the service disconnect, its minimum size is based on which table?
- Ungrounded conductors are increased in size for voltage drop. What must happen to the equipment grounding conductor?
- What is the general rule for the metal water piping system inside a building served by an electrical service?
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