Crane operation
10.1 Before operating the crane
Operating Instructions GMK5250L 3 302 633 en 10 - 13
27.09.2017
10.1.5 Earthing the load
Even if the truck crane is already earthed (Ã p. 11 - 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
earthing.
• Hammer a metal rod (4) (length approx.
2.0 m (6.6 ft)) at least 1.5 m (5 ft) deep into
the ground.
• For better conductivity, dampen the soil
around the metal rod (4).
• 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 handle (1).
• Hold the metal rod firmly by its insulated handle (1).
• To earth, touch the load with the metal rod.
B
Risk of accidents due to electric shock!
Always earth the load before operating the crane
– near strong transmitters (radio transmitters, radio stations, etc.),
– near high-frequency switchgear substations,
– if a thunderstorm is forecast.
If the load is charged with static electricity, you must always earth the load
before touching it.
B
Risk of accidents 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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