Mạch nhánh & Đi dâyCâu 158 / 521
At each conductor splice point, outlet, switch point, or junction in a raceway or cable system, what must generally be installed?
a.A grounding clamp
b.An expansion fitting
c.A box or conduit body
d.A bushing
Giải thích
Section 300.15 requires a box or conduit body at each splice, outlet, switch, junction, or pull point in raceway and cable systems, providing access and enclosure for connections. A grounding clamp, expansion fitting, and bushing serve other purposes and do not satisfy this enclosure requirement.
Trích dẫn luật: 2023 NEC §300.15Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
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