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2.13 Working in the vicinity of overhead power
lines
If the earth-moving machine is being used in the
vicinity of overhead power lines and trolley wires, a
safety distance which varies depending on the
nominal voltage of the overhead line must be
maintained between the lines and the earth-
moving machine and its work equipment, to
prevent current overspill. This also applies to the
distance between these lines and attached
implements or loads.
The safety distances specified below must be
complied with:
Nominal voltage in Volt
- 1,000 V
more than 1 kV - 110 kV
more than 110 kV - 220
kV
more than 220 kV - 380
kV
nominal voltage unknown
In the observation of safety distances, all working
movements
of
earth-moving
positions
of
the
work
dimensions of attached loads must be taken into
consideration. Uneven ground which would cause
the earth-moving machine to be inclined and thus
nearer to overhead lines must also be taken into
account.
During work in windy conditions, both overhead
lines and work equipment may swing out, thus
reducing the safety distance.
If it is impossible to maintain sufficient distance
from overhead power lines and trolley wires, the
plant operator must consult with the proprietor or
operator of the overhead lines to find other safety
precautions to prevent current overspill. Such
measures could be, e.g.
• Switching off the current
• Re-routing the overhead line
• Cabling, or
• Limiting
the
work
machines.
TL80
Safety distance in
meters
1.0 m
3.0 m
4.0 m
5.0 m
5.0 m
machines,
e.g.
equipment
and
the
zone
of
earth-moving
Safety and Accident Prevention 2
2.14 Operation in closed rooms
If earth-moving machines are to be used in closed
spaces, these areas must be sufficiently ventilated
and special regulations observed.
2.15 Work stoppages
Before rest periods and at the end of the working
day, the driver of the earth-moving machine must
park the machine on ground which has sufficient
carrying capacity and is as level as possible, and
must secure it against unintended movement.
Before rest periods and at the end of the working
day, the driver must lower the work equipment onto
the ground or secure it so that it cannot move.
The driver is not to leave the earth-moving
machine if the work equipment has not been
lowered to the ground or secured.
Earth-moving machines shall only be parked in
places where they do not present an obstacle, e.g.
on the construction site or to plant traffic. Warning
devices, e.g. triangles, warning cordons, flashing
or hazard lights are to be used if necessary.
Before leaving the operator stand, the driver must
bring all operating equipment and controls into
home position, switch off the working hydraulics
and apply the brakes.
If the driver is leaving the earth-moving machine
unattended, he must first turn off the drive motors
and ensure that they cannot be started up by
unauthorized persons (e.g. removing ignition keys).
13
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