Rigging work
12.2 Choosing a suitable site
Operating manual GMK 6400 3 112 993 en 12 - 13
12.07.2013
12.2.3 Earthing the truck crane
The truck crane may become charged with static electricity. This may occur
especially when using outrigger pads made of plastic or when the outrigger
pads are packed with insulating material (e.g. wooden planks).
Use electrically conducting material for earth-
ing.
• Hammer a metal rod (3) (length approx.
2.0 m [6.6 ft]) at least 1.5 m (5 ft) into the
ground
• Dampen the soil around the metal rod (3) for
better conductivity
• Clamp an insulated cable (2) to the metal rod
(3) (cross-section of at least 16 mm
2
[0.025 in
2
])
• Connect the free end of the cable with a
clamp (1)
• Attach the clamp to the main boom or to the superstructure
B
Risk of accident due to electric shock
Earth the truck crane before you start to work with it:
– Near strong transmitters (radio transmitters, radio stations, etc.)
– Near high-frequency switchgears
– If a thunder storm is forecast
B
Risk of accident due to electric shock
Ensure that the connections between the cable and the clamp are electri-
cally conductive.
Do not attach the clamp to parts that are screwed on, such as valves, covers
or similar parts.
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