What raceway type is permitted in a Class 1 Division 1 location?

In a Class 1 Division 1 location, the appropriate raceway type is rigid metal conduit (RMC). This is due to the electrical system needs in environments where flammable gases or vapors may be present. RMC provides a robust level of protection against physical damage, which is crucial in these hazardous locations.

Rigid metal conduit’s grounding capabilities also enhance safety by ensuring effective grounding and bonding, thus reducing the risk of electrical hazards. Moreover, RMC is capable of withstanding the potential exposure to the environmental conditions typically found in Division 1 locations, such as potential impacts and corrosive elements.

Other raceway types—like non-metallic sheathed cable (NMC) and liquid-tight flexible conduit (LMC)—do not meet the necessary standards for physical strength and environmental resistance required in hazardous areas. Although other options may be suitable for less hazardous locations, they fail to provide the same level of protection and safety critical in Class 1 Division 1 applications.