The outer covering on a liquid-tight flexible metal conduit is used for

• A. Electrical insulation
• B. Moisture Seal
• C. Physical protection
• D. Thermal insulation

Answer: (B)

The outer covering is there to seal out moisture. In liquid-tight flexible metal conduit, the metal inner conductor and its armor provide physical protection and flexibility, but the outer jacket is specifically designed to resist water and liquids, keeping the conductors inside dry in wet or damp locations. It’s not primarily about electrical insulation (that comes from the conductor insulation itself) or thermally insulating, and while it offers some physical protection, its key role is preventing moisture ingress.