Services & DistributionCâu 35 / 110
A feeder is protected by a 400-A overcurrent device. What is the minimum copper equipment grounding conductor?
a.#6 AWG
b.#4 AWG
c.#3 AWG
d.#1 AWG
Giải thích
For a 400-A overcurrent device the table requires #3 Cu for the equipment grounding conductor.
Trích dẫn luật: 2023 NEC Table 250.122Luyện miễn phí toàn bộ 110 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- A service uses #2/0 Cu ungrounded conductors. What is the minimum copper grounding electrode conductor?
- Where the grounding electrode conductor connects only to a made ground rod, what is the largest copper conductor size ever required?
- A branch circuit is protected by a 100-A overcurrent device. What is the minimum copper equipment grounding conductor?
- A service has 500-kcmil Cu ungrounded conductors per phase. What is the minimum copper grounded (neutral) service conductor for bonding purposes?
- Service phase conductors total 1,500 kcmil Cu per phase (over 1,100 kcmil). Using the 12.5% rule, what is the minimum copper main bonding jumper?
- A panelboard is rated 225 A. What is the maximum rating of the overcurrent device that may protect it?
Cập nhật gần nhất: · quy trình kiểm tra
Đội Ngũ Biên Tập PrepPass · Đối chiếu với Master Electrician Licensing Exam (NEC-based) · Quy trình kiểm tra