Mạch nhánh & Đi dâyCâu 135 / 521
What is the minimum height (headroom) of the working space about electrical equipment such as panelboards, generally required by 110.26?
a.6 ft
b.6 ft 2 in
c.6 ft 4 in
d.6 ft 6 in
Giải thích
Section 110.26(A)(3) requires the working space to be clear and extend from the grade or floor to a height of 6.5 ft (6 ft 6 in) or the height of the equipment, whichever is greater. The lower heights listed do not satisfy the minimum headroom.
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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