Theory & SafetyCâu 119 / 120
The dedicated equipment space above a panelboard extends from the top of the equipment to what height?
a.To the structural ceiling in all cases
b.3 feet above the equipment in all cases
c.6 feet above the equipment or to the structural ceiling, whichever is lower
d.6 and 1/2 feet above the finished floor
Giải thích
The dedicated space is the footprint of the equipment extended from the floor to a height of 6 feet above it or to the structural ceiling, whichever is lower, and no foreign piping, ducts or equipment may be installed in it. Suspended ceilings with removable panels are not considered structural ceilings, and the 6 and 1/2-foot dimension is the minimum headroom of working space, a separate requirement.
Trích dẫn luật: 2023 NEC §110.26(E)(1)Luyện miễn phí toàn bộ 120 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- A single-phase transformer has a 480-volt primary and a 120-volt secondary. If the secondary carries 100 amperes, what is the approximate primary current?
- What is the secondary full-load current of a 25 kVA single-phase transformer with a 240-volt secondary?
- A 480-volt panelboard is mounted on a wall with a grounded concrete wall directly behind the working space. What is the minimum depth of working space?
- What is the minimum width of working space in front of electrical equipment?
- Entrances at each end of the working space are generally required for equipment rated at least what value and over 6 feet wide?
- Which sequence correctly describes verifying that equipment is de-energized before beginning work?
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