SENSTAR FiberPatrol FP1100X Series, Руководство по планировке и монтажу

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Site survey
FiberPatrol Site Planning & Installation Guide Page 29
Isolation loops
Isolation loops are recommended at the start point of the detecting cable, on both sides of gates
that will be setup as independent zones, and at cable bypasses. Isolation loops require
approximately 13 m (43 ft.) of sensor cable coiled into a 60 cm (2 ft.) diameter loop (7 loops) to
provide a distinct zone demarcation point. Isolation loops can be buried in cable vaults, which will
provide the greatest level of isolation between two zones. However, if using a buried vault is
impractical, isolation loops can be attached directly to the fence fabric with 14 in. steel cable ties.
Figure 35 shows a cross section of a fence-mounted isolation loop attachment and Figure 25
shows the buried vault installation method for isolation loops. Isolation loops are attached to the
fence in the same manner as service loops (see
Figure 34 ).
Cable bypasses for buildings and structures
If there is building or other structure along the perimeter, it can be bypassed in the same manner
as a sliding gate. In some instances, it may be possible to pull the cable through conduit that has
been embedded in the structure. Otherwise, use the below ground cable bypass method. To
ensure the bypass cable will not cause alarms, use a 13 m (43 ft.) isolation loop at each end of the
bypass. The isolation loops can be buried in FiberPatrol vaults (see
Figure 37 ). If this method is
impractical, the isolation loops can be attached to the fence (see Figure 36 and Figure 38 ).
Figure 34 Service loop
Figure 35 Zone boundary isolation loop (fence-mounted)
Note Bypassed sections of perimeters should be protected by another sensor
technology (e.g., a microwave sensor).
service loop 5 loops
10 m (33 ft.)
60 cm
(2 ft.)
of sensor cable
fence wire
7 loops 60 cm (2 ft.) diameter
isolation loop cross section
app. 13 m (43 ft.) of sensor cable
14 in. steel cable tie