PAL-AT Installation Manual
20
4 Jumper Cable and Junction Box Installation
4.1 Jumper Cable
1. Jumper cable (types JMP-U, JMP-UD, or JPP) is used to connect sensor cable segments and probes
in series to form the sensing circuit (sensing string). Jumper cable is not affected by occasional contact
with water and can be installed in building and vaults. In underground locations and areas where
damage may occur to the jumper cable, electrical conduit should be used to provide protection. In wet
environments or areas subject to flooding, cable connectors on jumper cable should be located in
watertight electrical junction boxes (NEMA 4 or 4X) [IP66].
2. At least 50' [15 m] of jumper cable (65' [20 m] for type JPP) must be installed from the PAL-AT panel
or Zener Barrier Panel to the first section of sensor cable or probe. An exception is connecting to ATP
cable (see section 10).
3. Table 4-1 lists the length of jumper installed at the very end of a sensing string. A cable connector
must be installed to terminate the end of the last jumper cable section and a threaded plastic cap is
supplied to cover the connector.
4. Refer to section 9, table 9-1 for additional jumper cable required in a probe section.
5. Where possible, jumper cable connections to sensor cable should be made within the monitored area.
PermAlert recommends the use of OZ Gedney, or equal, cord grips installed as shown in figure 4-1.
Cord grips must clamp only jumper cable or TFH cable. The plastic outer braid on TFH cable must be
pulled back so the cord grip is located on the smooth outer jacket.
6. Check the cable/connector assembly with an ohmmeter in accordance with the cable testing
procedures contained in this manual.
7. The recommended minimum bend radius for all jumper cables is 1.5” [38mm].
Table 4-1
End of System Jumper Cable Length
System Length
ft / [m]
JMP-U/UD
End Jumper Length
ft / [m]
JPP
End Jumper Length
ft / [(m]
0–2500 / [0-750] 30 / [9] 40 / [12]
2500-5000 / [750-1500] 50 / [15] 65 / [20]
5000-7500 / [1500-2300] 100 / [30] 125 / [40]
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