Site survey
Page 24
FiberPatrol Site Planning & Installation Guide
Determining cable length requirements for gates
1. For each gate panel:
•
The sensor cable passes around the circumference of each gate panel at ¼ the gate
height, 30 cm in from the outside edge, and ¾ the gate height.
length of cable to protect a gate = 2 X (gate length - 30 cm) + gate 2 X (distance
from inside edge of gate to fence post) + (fence height - 60 cm, for sensitivity loop) + 10 m
service loop (per gate)
2. To reach the other side of a gate:
•
Create a sensitivity loop beside the fence post adjacent to the gate. Run the sensitivity
loop up to 30 cm from the top of the fence and back down the post to pass through the
split conduit. Loop the cable around the gate as described in step 1. Pull the cable through
the conduit to the other side of the gate. The conduit should be buried at a depth of 30 cm,
and the ends should extend at least 30 cm above ground level. Seal both ends of the
conduit (water tight) for areas which experience periods of freezing temperatures.
3. To isolate the gate zone for access/secure operation:
•
Add the length of the cable required to cover the two adjacent fence panels (one on each
side of the gate) plus two 13 m (43 ft.) isolation loops plus length of cable to reach the
buried vaults (if used).
Using the cable management kit at the hinged side of protected swinging gates
A section of split conduit is used at swinging gate locations to protect the sensor cable from being
caught or pinched by the gate while allowing the cable to rotate freely within the conduit when the
gate is opening and closing. FiberPatrol offers a cable management kit (p/n FPKT0500) which
includes a 1 m length of split conduit, two 1.15 m pieces of split loom and two gear clamps. The
split conduit is fitted against the fence post on the hinged side of the gate, the split loom prevents
the cable from rubbing against the edges of the conduit and the gear clamps are used to secure
the conduit to the fence post. The conduit must have notches cut at any points where gate
hardware is attached to the post, so the conduit can fit snugly against the fence post.
Figure 25 Independent gate zone (with buried isolation loops)
Figure 26 Independent gate zone
conduit
gate protection
sensitivity loop
13 m isolation loop
13 m isolation loop
10 m service loop
sensitivity loop
sensitivity loop
cable management kit
(split conduit)
conduit
cable management kit
gate protection
sensitivity loop
13 m isolation loop
13 m isolation loop 10 m service loop
NOT TO SCALE
(split conduit)
