PAL-AT Installation Manual
34
drawing showing locations requiring the installation of sensor cable and jumper. Depending on the
design of the secondary contained system and the free unobstructed air space available, both cables
(sensor and jumper) may be installed in the secondary containment air space. This will require
simultaneously pulling both cables, and most likely will reduce the length of cables that can be pulled
at one time. When 2 cables are installed in the same air space, both cables must be pulled out of the
secondary containment through the threaded coupling and finally connected together with a cable
connector in either: (1) a watertight capped pipe chamber connected to the threaded coupling, as
shown in figure 5-3 or (2) a NEMA 4X [IP66] junction box. This type of termination should also be
accessible to allow for future maintenance. As an alternative to pulling both cables into the air space
of the secondary containment, jumper cable can be routed in electrical conduit. If connectors must be
used, it is recommended they be installed in accessible watertight NEMA 4X [IP66] junction boxes
located at grade.
Figure 5-3
Branch Line Routing of Jumper Cable
16. At least 50' [15 m] of jumper cable must be installed from the PAL-AT panel before connection to
sensor cable. Refer to table 1 (see section 3) for jumper installed at the very end of a sensing string
in an enclosure (see figure 5-4). A cable connector must be attached to terminate the end of the
jumper cable. Install the red plastic cap supplied with the PAL-AT, over the connector to keep it clean.
The termination of the sensing string should be accessible for future maintenance.
Figure 5-4
Termination of Sensing String
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