Lập kế hoạch & Dự toánCâu 412 / 521
For 120/240 V equipment likely to require examination while energized (Condition 1), what is the minimum depth of working space in front of it?
a.3 ft
b.2 ft
c.4 ft
d.1 ft
Giải thích
Under Condition 1, the minimum working-space depth for equipment operating at 0-150 V to ground is 3 ft. Two feet or one foot is too little, and 4 ft applies to higher-voltage or worse 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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