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SIGNAL REFERENCE GRID CLAMP
INSTALLATION INSTRUCTIONS
CAT. NOS. 3900 & 3900BP
CAUTION
This clamp is not to be used for
grounding fault currents.
GENERAL
1. The clamp is designed for use on either a 1” round, or a
3/4” square trade size support post, the latter, must have a
3/4” inside diameter and approximately a .880” square
outside dimension.
2. The clamp accepts grid wires from 4 AWG to 8 AWG.
3. The clamp’s prime function is to secure the wire rmly to
the post.
4. The support post surface must be clean, free of dirt,
paints, electrical tape, rust or other oxides, or any other
material which might form an insulating layer between the
bare wire and the bare post.
5. The clamp can be easily installed with a nut runner hand
wrench, ratchet wrench, or screwdriver.
INSTALLATION PROCEDURE
1. Assuming that the grid wire has already been positioned
on the base oor of the raised oor area being
constructed, slip the clamp around the vertical support
post with its slot facing upward.
2. Lay the grid wire into the slot, and tighten the screw while
holding the wire at the bottom of the slot, see Fig. 1.
NOTE 1: If the grid wire has been specied as requiring an
insulation (for inspection purposes), the insulation must rst
be removed, wherever the wire is to be connected to a
support post,see Fig. 3.
NOTE 2: Due to the tapered opening of the clamp, it will
retain its original position when slipped onto a 1” post, but
must be hand held while installing on the smaller 3/4” square
trade size post.
NOTE 3: The clamp will rotate downward slightly during
installation so that the slot will secure the grid wire rmly
against the support post, see Fig. 2 and 3.
CLAMP
FIG. 1
CLAMP
ROTATES DURING
INSTALLATION
FIG. 2
FIG. 3
BARE
GRID WIRE
SLOT
POST
POST
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
notication 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 modication 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.
Thomas & Betts Corporation
Memphis. Tennessee
www.tnb.com
© 2010 Thomas & Betts. All Rights Reserved.
TA00110 C Page 1 of 1
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