Chapter 3 _______________________________________________________________ Installation
VAISALA_______________________________________________________________________ 25
Creating a New Concrete Foundation
1. Fasten the M10 × 40 wedge bolts to the lower ends of the
foundation screws (four each).
2. Fix a drilling template to the upper ends of the foundation screws
with nuts.
3. Place the template with the attached foundation screws into the
hole in such a way that approximately 30 mm (1.25 inches) of the
foundation screw threads stand above the surface. Note the cardinal
points indicated in Figure 4 on page 24.
4. Pour in the concrete and finish the foundation.
Using an Existing Concrete Foundation
1. Drill four holes with a diameter of 12 mm and a depth of 165 mm
(0.5 × 6.5 inches) into the concrete. Note the cardinal points
indicated in Figure 4 on page 24.
2. Fasten the M10 × 40 wedge bolts to the lower ends of the
foundation screws (four each).
3. Place the wedge bolt and foundation screw combinations into the
holes, with the wedge bolts down, and hammer the protruding
threads down.
4. Tighten the foundation screws a few turns to attach the wedge bolts
to the hole walls.
Grounding
CL31 is equipped with a separate grounding screw for external
grounding at the bottom of the shield.
CAUTION
At the installation site, a connection to a solid earth ground is mandatory
for adequate lightning and transient protection.
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