Courtesy of www.MikeHolt.com. Based on the 2023 NEC. Question: Class I, Division 1 locations are those areas in which ignitible concentrations of _____ can exist under normal operating conditions.
According to Sec. 314.3, “Nonmetallic boxes shall be permitted only with open wiring on insulators, concealed knob-and-tube wiring, cabled wiring methods with entirely nonmetallic sheaths, flexible ...
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