Core TradesCâu 84 / 700
When routing a nonmetallic-sheathed cable through holes bored in wood studs, the code generally requires that the hole be kept back from the stud edge, or a steel plate be installed, primarily to:
a.Keep the cable straight
b.Improve the wall's fire rating
c.Protect the cable from nails and screws driven into the framing
d.Reduce voltage drop
Giải thích
Bored holes must be set back from the framing edge (commonly about 1-1/4 inch) or protected by a steel plate so drywall screws and nails cannot pierce the cable. It is a physical-protection rule, not about straightness, fire rating, or voltage drop.
Trích dẫn luật: 2025 CA Electrical Code (based on NEC)Luyện miễn phí toàn bộ 700 câu hỏi — không cần đăng ký.
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