Dịch vụ & Phân phốiCâu 5 / 521
What is the minimum copper EGC for a circuit protected by a 200 A breaker, per Table 250.122?
a.6 AWG
b.8 AWG
c.4 AWG
d.3 AWG
Giải thích
Table 250.122 lists 6 AWG copper for a 200 A device. 8 AWG serves only up to 100 A; 4 AWG is for 300 A and 3 AWG for 400 A.
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
- The GEC from a service runs only to a driven ground rod (rod/pipe electrode). What is the largest copper GEC required for this connection?
- The only grounding electrode is a concrete-encased electrode (Ufer). What is the largest copper GEC that must be run to it?
- A feeder is protected by a 100 A overcurrent device. Per Table 250.122, what is the minimum copper equipment grounding conductor (EGC)?
- 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?
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