Crane operation
11.1 Before operating the crane
11 - 12 3 112 993 en Operating manual GMK 6400
12.07.2013
11.1.5 Earthing the load
Even if the truck crane is already earthed (Ã p. 12 - 13), the load may
become charged with static electricity. For example, if a hook block with
synthetic sheaves or non-conducting sling gear is used.
Use electrically conducting material for earth-
ing.
• Hammer a metal rod (4) (length approx.
2.0 m [6.6 ft]) at least 1.5 m (5 ft) deep into
the ground.
• Dampen the soil around the metal rod (4) for
better conductivity.
• Clamp an insulated cable (3) to the metal rod
(4) (cross-section of at least 16 mm
2
[0.025 in
2
]).
• Clamp the other end of the cable (3) to a
metal rod (2) with an insulated grip (1).
• Hold the metal rod by the insulated grip (1).
• To earth, touch the load with the metal rod.
B
Risk of accident due to electric shock
Always earth the load before operating the crane:
– Near strong transmitters (radio transmitters, radio stations, etc.)
– Near high-frequency switchgears
– If a thunder storm is forecast
If the load is charged with static electricity, you must always earth the load
before touching it.
B
Risk of accident due to electric shock
Ensure that the connections between the cable and the metal rods are elec-
trically conductive. When earthing, hold the metal rod only by the insulated
handle and keep a sufficient distance to the metal rod in the ground.
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