Thomas & Betts LTBUS05N-B LFMC SPLP UL 1-1/4IN GRN 15M/50FT

LTBUS05N-B is 1-1/4 inch trade size liquid tight flexible metallic conduit, supplied as a 50 foot (15 m) coil. One coil is one continuous run, so plan your pulls around that 50 foot length rather than expecting cut-to-order footage.

Liquid tight flexible metallic conduit is the standard choice for the flexible whip between a rooftop or pad mounted unit and rigid raceway, because the jacket keeps water and weather out of the steel core while letting the run absorb vibration and allow for service disconnection. The LTBUS05N-B covers that in 1-1/4 inch, which is the size range used for larger condensing units and rooftop package equipment feeders. You still need liquid tight fittings rated for the location at both ends; they are ordered separately.

The green jacket on the LTBUS05N-B is an identification color, not a different construction. Electricians and facility crews use colored liquid tight to segregate circuits or systems at a glance, for example keeping one service, control system, or voltage class visually distinct from gray conduit on the same rack. Underneath it is the same galvanized steel core flexible conduit.

The LTBUS05N-B has a galvanized steel core, which is what makes LFMC a metallic raceway rather than a plastic one. Whether the steel core is permitted as the equipment grounding conductor depends on trade size, circuit rating, and length under the NEC, and at 1-1/4 inch most installers pull a separate equipment grounding conductor. Check the article governing LFMC in the code edition your jurisdiction enforces before you rely on the core.

The metallic version, like the 1-1/4 inch LTBUS05N-B, has a galvanized steel core, so it resists crushing and physical abuse and gives you a metal raceway path. Liquid tight nonmetallic (LFNC) is lighter, tighter bending, and better where you want no metal in the run or where corrosion at the core is a concern, but it offers less mechanical protection. For motor whips, rooftop equipment, and anywhere carts or foot traffic can hit the conduit, the steel core type is the usual pick.

Order Thomas & Betts part number LTBUS05N-B. That number is the green, 1-1/4 inch, 50 foot (15 m) coil of liquid tight flexible metallic conduit. Distributors matching against a bid should quote that MPN rather than a size-and-color description, since the same size exists in other jacket colors under different numbers.