An toànCâu 440 / 521
An electrical room containing exposed live parts that is accessible only to qualified persons must have:
a.Entrances marked with conspicuous warning signs forbidding unqualified persons from entering
b.No signage of any kind
c.Carpeting on the floor
d.Only a fire sprinkler and nothing else
Giải thích
Rooms or enclosures with exposed live parts restricted to qualified persons must have entrances marked with conspicuous warning signs that prohibit unqualified persons from entering. Omitting signage, adding carpet, or providing only a sprinkler does not satisfy the requirement to warn and restrict access.
Trích dẫn luật: 2023 NEC §110.27Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- 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:
- The primary safety purpose of equipment grounding (bonding metal enclosures to the equipment grounding conductor) is to:
- Which statement about the grounded (neutral) and equipment grounding conductors is correct?
- A single ground rod electrode that does not achieve a resistance to earth of 25 ohms or less must be:
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