Speedfax 2017

Sentron Busway Systems
TBNK Fittings for Joint Mounted Tap Boxes
Revised on 06/30/19
Selection
TBNK flexible fittings
TBNK flexible fittings are a UL listed, factory installed series
of wireway couplings for use with Sentron Joint Mounted Tap
Boxes (JMTB’s). TBNK fittings provide a nominal 4.25” long
flexible wireway for coupling the JMTB and rigidly mounted
downstream equipment. TBNK fittings allow for expansion
and contraction of the Busway absorbing up to an inch of
movement. Available in 4, 6, and 8-inch sizes, TBNK fittings
are suitable for a wide range of equipment amperages and
cabling requirements. TBNK fittings if desired should be
selected when ordering Sentron JMTB’s.
Horizontal JMTB with TBNK
15
BUSWAY SYSTEMS
Installation and Grounding
TBNK flexible fittings must be field installed onto downstream
equipment. JMTB’s ordered with TBNK fittings include
Installation Instructions and a template for making the
required cut-out in the downstream equipment enclosure.
Location of equipment, cut out and cabling must comply with
applicable standards including NEC, Local Building Codes
and any other authorities having jurisdiction. Consult codes
in advance to assure compliance. The JMTB is shipped from
the factory with a braided copper ground cable riveted onto
the TBNK. During installation, the opposite end of the ground
cable must be connected to the enclosure of the downstream
equipment. The Installation Instructions provide details of the
ground cable installation procedure.
Vertical JMTB with TBNK
TBNK flexible fittings
Catalog
Number Cutout Size Wireway Size
Maximum
Cable Size
TBNK4 3.8”x 3.8” 4”x 4” (16 sq. inch) 900MCM
TBNK6 5.8”x 5.8” 6”x 6” (36 sq. inch) 500MCM
TBNK8 7.8”x 7.8” 8”x 8” (64 sq. inch) 4/0
15-20
Siemens Industry, Inc. SPEEDFAX Product Catalog