In Class I, Division 2 locations, what type of conduit is permitted when used with listed threadless fittings?

In Class I, Division 2 locations, the use of conduit must adhere to specific standards to ensure safety in environments where flammable gases or vapors may be present. Rigid metal conduit (RMC) and intermediate metal conduit (IMC) are both permitted in these locations when used with listed threadless fittings.

The reason these types of conduit are acceptable is due to their robust construction, which minimizes the risk of gas or vapor leakage. Rigid metal conduit provides effective protection against physical damage and helps to maintain the integrity of the wiring system in environments that could potentially expose it to hazardous materials.

Intermediate metal conduit offers similar protection while being lighter and more cost-effective than rigid metal conduit. Both options contribute to ensuring that the electrical systems installed in Class I, Division 2 locations remain safe and functional under potentially hazardous conditions.

Other types of conduits, like flexible metal conduit, research metal conduit, and plastic conduit, do not provide the same level of protection or are not suitable for these environments due to the potential for ignition and other safety concerns. Thus, RMC and IMC are the preferred choices in such classifications.