Publication 2100-IN012B-EN-P - April 2005
Installing Conduit and Cable 4-5
In Figure 4.3, 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.
Figure 4.3 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 amperes, cables should be braced every 12” (305mm). When the
short circuit current is 42,000 amperes or greater, cables should be braced
every 6” (153mm).
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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