In Class 1, Divisions 1 and 2 areas, a conduit seal must be installed within _____ of the boundary?

The installation of conduit seals in Class 1, Divisions 1 and 2 areas is a critical safety measure to prevent the ingress of ignitable gases, vapors, or liquids into electrical conduits and enclosures. The requirement that a conduit seal be installed within 10 feet (3.05 meters) of the boundary of a hazardous area is grounded in National Electrical Code (NEC) stipulations, which aim to reduce the risk of explosion or fire in environments where flammable materials are present.

Conduit seals serve to contain any potential explosive mixtures and prevent them from traveling along the conduit. By ensuring that seals are placed within this specified distance, the risk associated with any leaks or escape of hazardous materials is minimized. This distance is established based on practical requirements needed to effectively contain the hazard and provide a safe operational environment.

Other distances mentioned in the options would not comply with the NEC standards and could pose an increased risk of hazardous material migration, which is why they do not meet the code requirements. Thus, the requirement for a conduit seal to be installed within 10 feet of the boundary is a critical aspect of maintaining safety in Class 1, Divisions 1 and 2 areas.