Mạch nhánh & Đi dâyCâu 173 / 521
What is the minimum working-space depth for electrical equipment operating at 151 to 600 volts to ground under Condition 2 (exposed live parts on one side and grounded parts on the other)?
a.3 ft
b.3.5 ft
c.4 ft
d.2.5 ft
Giải thích
Table 110.26(A)(1) requires 3.5 ft of working clearance for 151-600 V to ground under Condition 2. Condition 1 at that voltage is 3 ft and Condition 3 is 4 ft. 2.5 ft is below any required minimum in this range.
Trích dẫn luật: 2023 NEC §110.26(A)(1)Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
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