In Class I, Division 1 locations, conduit seals must be installed within how many inches from the enclosure?

In Class I, Division 1 locations, it is essential to install conduit seals within 18 inches from the enclosure. This requirement exists due to the potential presence of flammable gases, vapors, or liquids in these areas, which can lead to hazardous conditions if not properly managed.

The purpose of installing seals at this proximity is to prevent any dangerous gases or vapors from entering the conduit and potentially igniting within the electrical system. By limiting the path through which hazardous substances can travel, the risk of ignition is significantly reduced. Additionally, the seal provides a physical barrier that can contain explosions or fires, protecting both personnel and equipment.

Understanding the specific requirement of 18 inches is crucial for compliance with the National Electrical Code (NEC), ensuring safety in environments where explosive materials may be present. The other choices were set at distances that do not align with NEC stipulations for Class I, Division 1 locations.