Rigging work
12.2 Selecting the suitable site
Operating manual 3 302 819 en 12 - 13
GMK3060
13.12.2018
12.2.3 Earthing the truck crane
The truck crane may become charged with static electricity. This may occur espe-
cially 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 earthing.
• Hammer a metal rod (3) (length about 2.0 m
(6.6 ft)) at least 1.5 m into the ground.
• For better conductivity, dampen the soil around
the metal rod (3).
• 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 using 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 switchgear
– 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 electrically
conductive.
Do not attach the clamp to parts that are bolted on, such as valves, cover plates
or similar parts.
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