Dịch vụ & Phân phốiCâu 56 / 521
Overhead service-drop conductors passing above a residential roof that is not readily accessible generally must maintain what minimum vertical clearance above the roof?
a.3 ft
b.10 ft
c.8 ft
d.12 ft
Giải thích
Per 230.24(A), service conductors must generally clear a roof by at least 8 ft (2.5 m) within 3 ft horizontally of the edge; various reduced-clearance provisions exist but 8 ft is the baseline. 3 ft and 12 ft are not the general roof-clearance value.
Trích dẫn luật: 2023 NEC §230.24Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
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