Where may a flexible connector NOT be used to connect a portable appliance?

A flexible connector is designed to provide a degree of flexibility for the connection between a gas appliance and the gas supply, facilitating movement or replacement of the appliance. However, certain locations are deemed unsuitable for the use of flexible connectors due to safety and regulatory concerns as outlined in NFPA 58.

In concealed areas, such as spaces between rooms, a flexible connector is not permitted because these locations pose potential hazards should a gas leak occur. The ability to readily detect gas leaks is crucial for safety; thus, connectors in concealed spaces would hinder this capability. In the event of a leak, the gas could accumulate out of sight, leading to an increased risk of fire or explosion without proper ventilation.

Open areas, rooftops, and near outdoor grills are typically considered acceptable for the use of flexible connectors as they provide adequate ventilation and reduce the risk of gas accumulation. If a leak were to occur in these settings, it would be more easily dispersed and detected, thereby mitigating the risks associated with gas appliances.