CommScope Trunk & Distribution Cable - Manual (Page 49)

Installing CommScope Cable into Conduit
Cable can be pulled in new or existing conduit. New conduit should be installed in as straight a path as
possible - undulations in the conduit system increase pulling tensions due to sidewall pressure. Existing conduit
systems generally require some maintenance prior to placing cables into the conduit. Use a rodding machine to
remove unwanted debris and water from the conduit.
A cable route survey will dictate the cable placement scheme which should account for the difficulty of the pull,
manpower and equipment availability.
The curve radii in the conduit systems should be large enough to prevent excessive pulling tension due to
sidewall friction. Very small radius bends may prevent even a cable as flexible as QR from being successfully
pulled.
Blowing or Jetting Cable
This process uses a combination of air pressure and a small drive to push the cable through a conduit. It is most
effective when placing a single cable. Since the cable is not pulled, pulling tension is not a concern.
Position the reel so that pay-off is from the top and is in as straight a line as possible with the entrance to the
duct. A small caterpillar drive pushes 150 - 200 feet (45 - 60 meters) of cable into the conduit. Air is then
forced into the conduit and the jetting action helps propel the cable with minimum effort.
With this method, a flexible cable like QR 860 can be pushed through 7 - 8 90° sweeps over a 1500 foot (450
meter) distance of 2 inch (5 cm) rigid PVC conduit.
Underground Installation 5.8
Conduit