Komatsu D31EX-21, Operation & Maintenance Manual, Page: 34 / 256

GENERAL PRECAUTIONS
SAFETY
2-16
SAFETY AT WORKSITE
Before starting operations, thoroughly check the area for any unusual conditions that could be dangerous.
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When carrying out operations near combustible materials such as thatched roofs, dry leaves or dry grass,
there is a hazard of fire, so be careful when operating.
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Check the terrain and condition of the ground at the worksite, and determine the safest method of operation.
Do not carry out operations at places where there is a hazard of landslides or falling rocks.
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If water lines, gas lines, or high-voltage electrical lines may
be buried under the worksite, contact each utility and iden-
tify their locations. Be careful not to sever or damage any
of these lines.
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Take action to prevent unauthorized people from approach-
ing the jobsite.
When working on public roads, position flagmen and erect
barriers to ensure the safety of passing traffic and pedestri-
ans.
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When traveling or operating in shallow water or on soft
ground, check the shape and condition of the bedrock, and
the depth and speed of flow of the water before starting
operations.
WORKING ON LOOSE GROUND
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Avoid traveling or operating your machine too close to the edge of cliffs, overhangs, and deep ditches. The
ground may be weak in such areas. If the ground should collapse under the weight or vibration of the machine,
there is a hazard that the machine may fall or tip over. Remember that the soil after heavy rain or blasting or
after earthquakes is weak in these areas.
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When working on embankments or near excavated ditches, there is a hazard that the weight and vibration of
the machine will cause the soil to collapse. Before starting operations, take steps to ensure that the ground is
safe and to prevent the machine from rolling over or falling.
DO NOT GO CLOSE TO HIGH-VOLTAGE CABLES
Do not travel or operate the machine near electric cables. There is a hazard of electric shock, which may cause
serious injury or property damage. On jobsites where the machine may go close to electric cables, always do as
follows.
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Before starting work near electric cables, inform the local power company of the work to be performed, and
ask them to take the necessary action.
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Even going close to high-voltage cables can cause electric
shock, which may cause serious burns or even death.
Always maintain a safe distance (see the table on the right)
between the machine and the electric cable. Check with
the local power company about safe operating procedure
before starting operations.
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To prepare for any possible emergencies, wear rubber
shoes and gloves. Lay a rubber sheet on top of the seat,
and be careful not to touch the chassis with any exposed
part of your body.
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Use a signalman to give warning if the machine
approaches too close to the electric cables.
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When carrying out operations near high voltage cables, do
not let anyone come close to the machine.
Voltage of Cables Safety Distance
100 V - 200 V Over 2 m
6,600 V Over 2 m
22,000 V Over 3 m
66,000 V Over 4 m
154,000 V Over 5 m
187,000 V Over 6 m
275,000 V Over 7 m
500,000 V Over 11 m