Chapter 4 _______________________________________________________________ Installation
VAISALA_______________________________________________________________________ 39
0712-009
Figure 15 Recommended Mast Length on Top of Building
The recommended minimum length (h) for the mast that is installed on
top of a building is 1.5 times the height of the building (H). When the
diagonal (W) is less than the height (h), the minimum length of the mast
is 1.5 W.
WARNING
To protect personnel and the transmitter, install a lightning rod with
the tip at least one meter above the transmitter. The rod must be
properly grounded, compliant with all applicable local safety
regulations.
CAUTION
Installations on top of high buildings or masts and in sites on open
grounds are vulnerable to lightning strikes. A nearby lightning strike
can induce a high-voltage surge not tolerable by the internal surge
suppressors of the instrument.
Additional protection is needed in regions with frequent, severe
thunderstorms, especially when long line cables (> 30 m) are used.
Vaisala recommends using a surge protector, such as WSP150 and
WSP152, in all sites with an elevated risk of lightning strike.
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