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B121BFSS
Adjustable
®
Floor Box Kit
with Stainless
Steel Cover
THE FAST, EASY WAY TO PUT A
PLUG ANYWHERE YOU NEED IT!
Eliminates extension cords.
Great for home ofces &
entertainment rooms.
Easy to use - kit includes
everything you need!
Can be used for
new and existing
ADJUSTS TO MOST
FINISHED FLOOR HEIGHTS!
Kit includes:
• Stainless Steel Cover with
Ground Lug and Wire
• Adjustable 20 cu. in. Nonmetallic
Floor Box
• Duplex Receptacle
• Molded Cable Clamps
• Mounting Bracket
• All Mounting Hardware
construction
Floor Box
655A
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INSTALLATION INSTRUCTIONS
Install clip over subfloor.
Screw in to adjust to height
of flooring or carpet.
WARNING
RISK OF SHOCK, DISCONNECT
POWER BEFORE INSTALLATION.
This floor box is designed to be mounted on
a joist or subfloor. It can be installed on the
top of the joist or from the bottom if the
thickness of the joist is sufficient to allow
installation of the box. If the unit is to be
installed from the bottom of the joist, check
prior to installation to ensure there is
sufficient adjustment remaining as this type
of installation is non-standard.
The unit can also be installed using the old
work (small) bracket that is included. This
bracket facilitates the installation of the box
in areas where the larger new work bracket
cannot be used. The old work bracket edge
is hidden by the cover when installed.
However, before cutting into the wood, you
must ensure that the mounting screws will
properly support the bracket/box installation.
For planning purposes please ensure that
the maximum installed height to the bottom
of the cover does not exceed 1-3/4˝ above
the top of the mounting bracket.
The kit is listed as a floor box by
Underwriters Laboratories. The kit also has a
two (2) hour fire classification. Only covers
manufactured for this box can be used with
this assembly.
Floor box kit should be installed by a
certified electrician.
Beautiful flush fit every time!
WARRANTY: Thomas & Betts sells this product with the understanding that the user will perform all necessary
tests to determine the suitability of this product for the user's intended application. Thomas & Betts warrants that
this product will be free from defects in materials and workmanship for a period of two (2) years following the
date of purchase. Upon prompt notification of any warranted defect, Thomas & Betts will, at its option, repair or
replace the defective product or refund the purchase price. Proof of purchase is required. Misuse or unauthorized
modification of the product voids all warranties.
Limitations and Exclusions: THE ABOVE WARRANTY IS THE SOLE WARRANTY CONCERNING THIS PRODUCT,
AND IS IN LIEU OF ALL OTHER WARRANTIES EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY
IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, WHICH ARE
SPECIFICALLY DISCLAIMED. LIABILITY FOR BREACH OF THE ABOVE WARRANTY IS LIMITED TO COST OF
REPAIR OR REPLACEMENT OF THE PRODUCT, AND UNDER NO CIRCUMSTANCES WILL THOMAS & BETTS BE
LIABLE FOR ANY INDIRECT, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES.
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Installation – New Work Bracket
1. The new work bracket may be installed on the
floor joist below a 3/4 inch subfloor. When a
thicker subfloor is used we recommend cutting a
hole in the subfloor using the box as a template
and adjacent to the joist so the mounting screws
will engage the joist as well as the subfloor. Use
the four (4) #6x1-3/4” self-tapping screws
supplied with the kit to mount the bracket.
2. If the new work bracket is installed from the
underside of the joist, ensure the alignment with
the box and opening before installing the
bracket. Use the four (4) #6x1-1/4” self-tapping
screws supplied with the kit to mount the
bracket.
3. The romex wire can then be pulled through the
desired clamp and the box aligned in the bracket
slide. Ensure the adjusting screw is aligned on
the bracket and rotate the screw clockwise
using an electric or pneumatic POWER screw
gun. (The adjusting screw can be turned
manually with a screwdriver, but this is a
self-tapping screw that is cutting threads into
hardened steel and it will be very, very difficult.)
4. Adjust the box flush to 1/2” above floor, leaving
sufficient room to complete the installation.
5. Wire the receptacle in accordance with the
National Electrical Code. Attach a short length of
green or un-insulated grounding wire to ground
lug on the receptacle. Connect ground wire from
receptacle and green ground wire provided with
cover to ground wire entering the box using
appropriate wire connector.
6. Align the receptacle on the recessed bosses and
place the cover on the box with the outlet caps
open. Push cover into the box until bottom of
cover flange is flush with top of box.
7. Insert the two (2) #6-32x1” flat-head machine
screws in the holes in the cover, ensuring that
the screw is aligned with and captivates the
receptacle. DO NOT OVER TORQUE. Tighten the
screws to a maximum of 6 to 8 inch pounds.
Ensure bottom of cover flange is flush with top
of box.
8. Remove the plug on the cover that hides the
adjusting screw opening and set it aside where
it will not be misplaced.
9. Using the adjusting screw, adjust the assembly
so cover flange is flush with floor covering. Do
not pre-load the cover against the floor covering.
Place the threaded plug you previously set aside
in the adjusting screw opening and tighten.
10. Turn the coin slot lock in the center of the cover
in either direction to lock the outlet caps.
Installation – Old Work Bracket
1. As indicated in the prior instructions, ensure
there is sufficient depth of the floor covering to
install the old work bracket. If not, the bracket
must be installed adjacent to the joist where the
screws will engage the joist/flooring for support.
2. Use the box as a template and cut out an
opening in the floor cover.
3. Place the bracket on the side of the opening
where it is to be mounted with the two tabs up
and resting on the surface. (Be careful not to
drop the bracket into the opening.)
4. Install the bracket using the two (2) #6 square
drive trim head screws provided in the kit. Since
the screws are installed at an angle, there may
be a small part of the screw head that
protrudes. This is to be anticipated and will not
interfere with the installation of the box.
5. Use the installation instructions for the new
work bracket from this point forward starting
with step 3.
Old work bracket
installation for tight
locations or cut-in
situations
MAINTENANCE
To ensure continued service, it is
recommended that the sealing
surfaces of the caps and cover be
kept free of debris.
NOTE:
Ground stainless steel cover
using green grounding screw and
ground wire provided.
IS121S C
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®
Adjustable Floor Box Assembly
Green Ground Wire
Stainless
Steel Cover
Plug
Receptacle
20 cu. in.
Adjusting Screw
Package Contents
•
• One (1) New Work Bracket
• One (1) Old Work Bracket
• One (1) 20 cubic in. UL Listed Floor Box
• One (1) UL Listed Stainless Steel Floor Cover
• One (1) Short Shank Receptacle
• Green Ground Wire
Two (2) #6-32x1˝ Flat Head Machine Screws
• Four (4) #6x1-1/4˝ Flat Head Self-tapping Screws
• Two (2) #6 Square Drive Trim Head Screws
• One (1) Tube Dow Corning #4 Sealant
• Installation Instruction
CAUTION
The floor box has undergone a scrub water test as required by UL under criteria specified in 514C for this
type of application. However, it is not intended for nor approved for wet locations or outdoor installation.
Floor Box
New Work Bracket
Old Work Bracket
s
Thomas & Betts Corporation
Memphis, TN 38125
© 2016 Thomas & Betts. All Rights Reserved.
www.tnb.com
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