Earthing The Truck Crane - Manitowoc Grove GMK4100L-1 Operating Manual

12.2.3
B
B
Operating manual
GMK4100L-1

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).
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.
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.
•
Attach the clamp to the main boom or the superstructure.
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 (2) to the metal
rod (3) (cross-section of at least 16 mm
(0.025 inches
•
Connect the free end of the cable using a
clamp (1).
3 302 690 en
12.2 Choice of a suitable positioning site
2
)).
Rigging work
2
12 - 15