Thomas & Betts LTBUS06N-B LFMC SPLP UL 1-1/2IN GRN 15M/50FT

LTBUS06N-B is 1-1/2 inch trade size liquid tight flexible metallic conduit, supplied in a 50 foot (15 m) coil. One coil is one orderable unit, so a run longer than 50 feet means multiple coils plus couplings at the joins.

The green jacket on LTBUS06N-B is a color-coded identification jacket over a galvanized steel core. Electrically and mechanically it is the same liquid tight flexible metallic conduit construction as a gray jacket; contractors and facility electricians use the green to flag a particular circuit class, system, or service at a glance so crews do not have to trace it later. If your spec or facility color scheme calls for gray, order the gray version of the same trade size instead.

Use the 1-1/2 inch LFMC for the final connection where the equipment vibrates or has to be pulled for service: a motor, pump, rooftop HVAC unit, or chiller. The flexible steel core absorbs vibration that would crack a rigid run and lets you move the equipment without breaking the raceway. Run rigid or EMT for the long straight distances and transition to a short LFMC whip at the equipment. Running 50 feet of flexible where rigid belongs costs more and sags between supports.

Pull a separate equipment grounding conductor. The galvanized steel core of LFMC is only permitted as the grounding path within narrow length and ampacity limits, so on a 1-1/2 inch feeder serving a motor or large unit the practical answer on nearly every job is a green wire inside the conduit sized to the overcurrent device. Inspectors look for it, and it is cheaper than reworking the pull.

Thomas & Betts part number LTBUS06N-B. The 06 in that number is the 1-1/2 inch trade size and the -B is the 50 foot coil put-up in green. Give a distributor the full LTBUS06N-B string rather than a description, since the same series runs across several trade sizes and jacket colors.