The thicker Metallic Flexible Conduit is full wall and the thinner wall product is reduced wall flexible metal conduit. Total Wall is much more robust and is defined where the specification calls for additional mechanical protection. The Reduced wall flexible conduit is available in both high quality galvanized steel and an aluminum alloy strip of uniform gauge for an excellent combination of strength and endurance. Reduced wall flexible conduit may be utilised in flexible metallic raceway systems for electrical power, communication cables, engine leads, listed assemblies and cable fixtures and manufactured wiring systems. The Reduced Wall product should additionally meet an effect performance evaluation. Both structures are UL® listed to be used in accordance with the NEC.