Lập kế hoạch & Dự toánCâu 414 / 521
What is the minimum headroom (height) of working space about electrical equipment such as panelboards?
a.6 ft
b.6 ft 3 in
c.6 ft 6 in
d.7 ft
Giải thích
The minimum headroom of working space is 6 ft 6 in (or the height of the equipment if taller). The lesser heights do not satisfy the requirement, and 7 ft exceeds the minimum.
Trích dẫn luật: 2023 NEC §110.26(A)(3)Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
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