Mạch nhánh & Đi dâyCâu 133 / 521
What is the minimum depth of working space in front of electrical equipment operating at 0 to 150 volts to ground, where there are exposed live parts on one side and no live or grounded parts on the other (Condition 1)?
a.2.5 ft
b.3 ft
c.3.5 ft
d.4 ft
Giải thích
Table 110.26(A)(1) requires a minimum working clearance of 3 ft (Condition 1) for equipment at 0-150 V to ground. This depth allows safe access for operation and maintenance. 2.5 ft is below the minimum; 3.5 and 4 ft apply to higher voltage or more hazardous conditions.
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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