Mạch nhánh & Đi dâyCâu 167 / 521
Direct-buried conductors or cables emerging from grade must be protected by enclosures or raceways from the required cover depth up to what height above finished grade?
a.3 ft
b.5 ft
c.6 ft
d.8 ft
Giải thích
Section 300.5(D)(1) requires direct-buried conductors and cables emerging from grade to be protected by enclosures or raceways from the required burial depth to at least 8 ft above finished grade. Lower heights of 3, 5, and 6 ft leave the emerging conductors exposed to physical damage.
Trích dẫn luật: 2023 NEC §300.5(D)(1)Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
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