How should attachment plugs and receptacles in Class I locations of aircraft hangers be designed?

In Class I locations, which deal with areas where flammable gases or vapors may be present, attachment plugs and receptacles must be designed to remain non-energized while connections are made or broken. This is crucial because it helps to prevent potential ignition sources during the connection process.

When a plug is inserted or removed, there can be arcing or sparking, which poses a significant risk in environments where flammable materials are present. By ensuring that the plugs and sockets remain non-energized during these operations, the risk of igniting volatile substances is minimized. This design consideration aligns with safety regulations and standards established for hazardous locations, reflecting an understanding of the specific risks involved in such environments.

The design requirement to keep connections non-energized helps to ensure the safety of personnel and equipment in aircraft hangers, where fuel vapors and other flammable materials may frequently be handled. Therefore, the importance of this design attribute cannot be overstated in enhancing operational safety.