PAL-AT Installation Manual
33
cable through the junction box and conduit.
9. Splice the sensor cable to the continuous pull rope using the method described in section 4.3, "Cable
Splices".
10. At least two workers are required to pull sensor cable. Work should proceed continuously from pull
point to pull point. At the lowest elevation between two pull points, one person should slowly pull on
the pull rope. At the higher elevation pull point, the second person should carefully play out the cable
while pushing it into the interstitial air space. This push/pull action significantly reduces the pulling
force required to install the cable. If a problem does arise, the workers must be able to signal each
other quickly. Walkie-talkies are recommended so communication can occur to prevent cable damage.
11. The pulling force should never exceed 50 lb [23 kg]. If a snag is encountered, carefully work the
cable back and forth in an attempt to clear the cable. If the snag cannot be cleared, contact PermAlert's
Field Service Department for assistance.
12. Where electrical conduit and junction boxes are required, use watertight NEMA 4X [IP66] boxes and
mount per the instructions contained in this guide. Temporarily pull enough sensor cable out of the
secondary containment and into the junction box (approximately 2' [600 mm]) to allow installation of
cable connectors (see figure 5-2). Make sure the bushings and cord grips are slipped on the
jumper cable before installing the cable connectors. Attach the cable connectors, test them, and
push the assemblies into the electrical conduits. Thread and tighten the cord grips making a watertight
seal against the jumper cable. The conduit termination points must be sealed. Do not leave conduit
termination points open, or moisture may enter and wet the sensor cable.
13. The ends of all cables should be kept dry during installation. If the cable ends are submerged
in water, capillary action will wick water into the center conductor. This could cause corrosion
and shorten the life of the cable.
14. If TFH cable is installed, the ends of the cable must be immediately sealed with the shrink tube
caps supplied by PermAlert to prevent water from entering the cable under the jacket. Make
sure the polyester overbraid is not under the shrink cap to insure a good seal. If water is allowed to
enter the ends of TFH cable, it must be replaced.
Figure 5-2
Cable Connections with Electrical Conduit and Junction Boxes
15. In contained pipe systems where branch runs and main runs are monitored, jumper cable can be used
to return to the main from the branch. For these installations, PermAlert can furnish a cable routing
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