Thiết bị & Hệ thốngCâu 334 / 521
How must Class 2 conductors generally be separated from electric light and power conductors?
a.They may be freely mixed with 480 V conductors
b.6 inches with no exceptions
c.12 inches always
d.At least 2 inches from power conductors unless a permitted separation method is used
Giải thích
Section 725.136 generally requires Class 2 conductors to be separated at least 2 inches from conductors of electric light, power, and Class 1 circuits, unless one of the permitted separation methods (such as a barrier or listed cable) is used. Freely mixing them in a raceway or enclosure with power conductors is not allowed.
Trích dẫn luật: 2023 NEC §725.136Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
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