Publication 2100-IN012C-EN-P - April 2009 45
Installing Conduit and Cable Chapter 3
Securing Cables with Hardwood
In this example, a hardwood brace (maple hardwood) made for the
specific application is used. Holes are bored approximately the size of
the cable diameter. Several bolt holes are also bored the breadth of
the hardwood brace. The brace is cut in two pieces and is used as a
clamp to secure the cables. Through bolts are inserted into the brace
and tightened so that cables are held tightly in place.
Securing Cables with Hardwood
A second form of hardwood brace (not shown) is a yolk type in
which the cables are passed through. Holes should be small enough
to provide a snug fit for the cables. The connectors or lugs are
attached to the cables and cables are bolted to the terminals.
When using the hardwood bracing method and the short circuit
current is less then 42,000 A, cables should be braced every 12 in.
(305 mm). When the short circuit current is 42,000 A or greater, cables
should be braced every 6 in. (153 mm).
Incoming Line Brace
Allen-Bradley manufactures an incoming line brace similar to the
hardwood clamping-type brace. To order an incoming line brace,
contact your local Allen-Bradley sales office and reference assembly
number 40113–848.
IMPORTANT
Lugs should be installed so they are in line with each other and
proper spacing is used between phases. Hardware must be
torqued per the torque tables found on the enclosure door.
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