Chapter 10 Raceway Systems 153 Copyright Goodheart-Willcox Co., Inc. Liquidtight Flexible Metal Conduit: Type LFMC — Article 350 Locations s All Al lo wed Dry Wet Direct D i re burial (where listed and marked) Maximum Mounting Distance 12″ 4 1/2′ Arlington Industries, Inc. Figure 10-20. Fittings for liquidtight flexible metal conduit (LFMC) prevent water from entering the joints. machinery that is portable or may vibrate dur- ing normal operation. LFMC is also permitted as a service wiring method up to 6′ in length. LFMC requires special fi ttings and connect- fi ing procedures to ensure watertight joints. See Figure 10-20. 10.8 Surface-Mount Raceways Surface-mount raceway is an assembly of hol- low tracks or channels and special boxes and other fi ttings that mount to the surface of a wall fi or ceiling. The channels come in two parts: a base, which mounts to the wall, and a cover that snaps over the base. Covers usually are rectangular or fl attened-oval in profile fl and have a finished, fi fi somewhat decorative appearance. Channel sec- tions are 10′ long and range from 3/8″ to 3″ ″ high ″ and from 1/2″ to 4″ ″ wide. Surface-mount race- ″ way is constructed of steel, aluminum, or plastic. Surface-mount raceway is mounted on wall or ceiling surfaces only in dry locations and where it will not be subject to physical dam- age. Elbows, connectors, couplings, and boxes are designed to be electrically and mechani- cally continuous and compatible. This raceway is useful in existing homes or facilities when appearance is important and new wiring can- not be pulled through walls. LFMC Fittings Straight Connector One-Piece Screw-In Connector 90° Connector