An toànCâu 436 / 521
The clear working space in front of a panelboard must be at least how wide and how high?
a.18 inches wide and 6 feet high
b.30 inches wide (or the width of the equipment, whichever is greater) and 6½ feet high
c.24 inches wide and 5 feet high
d.36 inches wide and 7 feet high
Giải thích
Working space must be at least 30 inches wide, or the width of the equipment if greater, and at least 6½ feet high (or the height of the equipment). 18, 24, or 36 inches and the other heights do not match the code minimums for width and headroom.
Trích dẫn luật: 2023 NEC §110.26Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- You are servicing a circuit that feeds a variable frequency drive (VFD) with large DC-bus capacitors. After disconnecting power you must:
- You are installing a 480Y/277V panelboard with exposed live parts likely to require examination while energized. There is a concrete (grounded) wall on the opposite side of the working space (Condition 1). What is the minimum working-space depth in front of the panel?
- A 480V panel is installed so the worker stands between two energized sections with exposed live parts on both sides of the working space (Condition 3). What minimum working-space depth is required?
- The 'dedicated equipment space' above an indoor panelboard or switchboard:
- For electrical equipment rated 1,200 amperes or more and over 6 feet wide, how many entrances to the working space are generally required?
- Live parts operating at 50 volts or more must be guarded against accidental contact by:
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