Advanced WiringCâu 56 / 110
A location where ignitable concentrations of flammable gases or vapors exist under normal operating conditions is classified as:
a.Class II, Division 1
b.Class III
c.Class I, Division 2
d.Class I, Division 1
Giải thích
Class I covers flammable gases/vapors; Division 1 means ignitable concentrations can exist under normal operation, so it is Class I, Division 1.
Trích dẫn luật: 2023 NEC 500.5(B)(1)Luyện miễn phí toàn bộ 110 câu hỏi — không cần đăng ký.
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