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GeoZone 'A' Perimeter Security System
Installation Manual
6 Welded Mesh Fences
6.1 General
Welded mesh fences are frequently used on sites requiring a higher degree of
protection than can be offered by chain-link fences. Welded mesh fences are generally
harder to climb over and require more cuts before a hole sufficiently large enough to
permit an intruder to pass through can be made.
Typical welded mesh fence construction comprises 3 mm diameter steel wire welded
into a grid configuration with a horizontal spacing between the wires of 75 mm and a
vertical spacing of 25 mm. The usual finish is plain galvanised coating. The fencing is
produced in panels approximately 2.4 m high by 3 m wide and is erected on metal
posts. All of the following recommendations apply to this type of fence.
IMPORTANT
If a welded mesh fence of radically different construction to that
described above is encountered, contact Geoquip Worldwide
for further advice before installation commences.
As with chain link fences it is imperative that the site survey described in Section 2.1 is
carried out prior to the sensor installation.
6.2 Sensor Alignment
Study the fixing of the welded mesh panels to the posts and note on which the side of
the fence the horizontal elements are located. Installation of the sensor on the same
side of the fence as the horizontal wires will result in a much neater arrangement of the
sensor and is to be preferred if possible.
If the horizontal wires are on the outer side of the fence, this will mean fixing the sensor
to the outside of the fence which may not be acceptable to the client. If this is
acceptable it is important to position the cable ties as shown in Figure 15.
Figures 12 and 13 show the ideal configuration whereby the sensor is fitted on the
same side as the horizontal wires.
Figure 12
Figure 13
Figures 14 or 15 show the alternative arrangement whereby the sensor is fitted on the
opposite side to the horizontal wires.
Page 15
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