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Liquid-tight flexible metal and nonmetallic conduit (LFMC/LFNC) has a moisture-resistant outer cover that conducts and safeguards wire and cable in hard-to-reach areas. It is liquid-tight when paired with conduit fittings that are also liquid-tight. LFMC can be used in open or covert circumstances that call for adaptability or defense against liquids, vapors, or solids. It is permitted in a few designated hazardous (classified) regions and, when identified and labelled as such, may be used for immediate burial. A set of rules for the secure installation of electrical wiring in the US called the National Electrical Code (NEC) is constantly being revised.
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