Earthing The Load - Manitowoc Grove GMK4100L-1 Operating Manual

11.1.5
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Operating manual
GMK4100L-1

Earthing the load

Even if the truck crane is already earthed (
become charged with static electricity. For example, if a hook block with
synthetic sheaves or non-conducting sling gear is used.
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.
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.
•
Hold the metal rod firmly by its insulated handle (1).
•
To earth, touch the load with the metal rod.
Use electrically conducting material for
earthing.
•
Hammer a metal rod (4) (length of 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 (4).
•
Clamp an insulated cable (3) to the metal
rod (4) (cross-section of at least 16 mm
2
[0.025 in ])
•
Clamp the other end of the cable (3) to a
metal rod (2) with an insulated handle (1).
3 302 690 en
Crane operation
11.1 Before operating the crane
à
p. 12 - 15), the load may
2
11 - 13