An toànCâu 437 / 521
The 'dedicated equipment space' above an indoor panelboard or switchboard:
a.Extends only 6 inches above the equipment
b.Extends only 1 foot above the equipment
c.Extends only 3 feet above the equipment
d.Extends from the top of the equipment to 6 feet above it (or to a structural ceiling), and must be kept clear of foreign piping and ducts
Giải thích
The dedicated space extends from the top of the equipment upward 6 feet or to a structural ceiling, whichever is lower, and no foreign systems (piping, ducts) may occupy it. The 6-inch, 1-foot, and 3-foot answers understate the code-required dedicated space above electrical equipment.
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 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 clear working space in front of a panelboard must be at least how wide and how high?
- 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:
- An electrical room containing exposed live parts that is accessible only to qualified persons must have:
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