Mạch nhánh & Đi dâyCâu 151 / 521
Each multiwire branch circuit must be provided with a means to simultaneously disconnect all what, at the point where the branch circuit originates?
a.Grounded conductors
b.Equipment grounding conductors
c.Neutral conductors only
d.Ungrounded conductors
Giải thích
Section 210.4(B) requires a means to simultaneously disconnect all ungrounded (hot) conductors of a multiwire branch circuit at the point of origin, typically a handle tie or common-trip breaker. This prevents shock when servicing a shared neutral. Grounded, equipment grounding, and neutral-only choices misstate the rule.
Trích dẫn luật: 2023 NEC §210.4(B)Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
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