T8 Manual - UMS

Protecting the measuring site
General recommendations for lightning protection and grounding for
stations with battery power
First step
Recommendations for
lightning protection on
masts
Recommendations for
lightning protection of
enclosures
System protection of
stations with enclosure
and mast
Lightning protection
with grounding rods
Measure the voltage drop between sensor
positions, data acquisition etc. to get to know
the potential levels
2 or 3 meter masts can be equipped with a
lightning rod which is installed on top of the
mast, and a grounding rod which is clamped to
the foot of the mast. This creates a certain
protected space in a 45 degree angle around
the tip
Surge protection devices are installed in one
corner inside the measuring enclosure. All lines
to and from the surge protection devices should
not run parallel.
Lines to equalize drops in the electrical potential
between mast and grounding rod are installed
50 cm below the soil surface.
According to the standards the ground rod
(diam. 25 mm) must be inserted into the ground
for a minimum of 2,5 meters below the frost
level, i. e. in general 3 meters. Cross shaped
rods are less advisable for such low depths, but
this depends on soil type, moisture or clay
content, and distance between soil surface and
ground water level.
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