Rigging work
12.2 Choice of a suitable positioning site
Operating manual 3 302 736 en 12 - 15
GMK4090
xx.xx.xxxx
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
earthing.
• Hammer a metal rod (3) (length about 2.0 m
(6.6 ft)) at least 1.5 m (5 ft) into the ground.
• For better conductivity, dampen the soil
around the metal rod (3).
• Clamp an insulated cable (3) to the metal
rod (4) (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 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 bolted on, such as valves, cover
plates or similar parts.
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