Komatsu PC18MR-3, Operation & Maintenance Manual

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PRECAUTIONS TO BE TAKEN WHEN WORKING
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When using a breaker or other heavy-duty equipment, the machine may lose its balance and overturn. Both
when operating on flat ground and when operating on slopes, keep to the following instructions:
1 - Do not lower, swing, or stop the work equipment suddenly.
2 - Do not extend or retract the boom cylinder suddenly, since the impact may cause the machine to overturn.
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Do not move the bucket over the head of other workers or over the operator seat of dump trucks or other trans-
port equipment. The load may be spilled or the bucket may hit the dump truck and cause serious injury or prop-
erty damage.
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The operator or person attaching the sling should inspect the bucket link lifting device and all components in the
load line (e.g. chains, shackles etc.) visually for damage or deformation before use to ensure that they are not
damaged or worn.
Any damaged, deformed or worn parts should not be used and must be replaced.
2.4.9 PREVENTING ELECTROCUTION
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Digging operations near overhead electric lines are extremely dangerous and they may also cause death due to
electrocution; for this reason, when working near overhead electric lines always respect the minimum safety dis-
tances prescribed by the competent authorities and by the accident-prevention rules in force.
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As far as underground long-distance lines are concerned, the minimum distance depends on the covering of the
ducts in which the cables are laid.
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The basic safety precautions to be taken to prevent this risk are the following:
1 - Wear shoes with thick rubber or leather soles.
2 - Request the aid of another person who can warn you if the machine gets too close to the electric line.
3 - Operate at low speed.
4 - Get acquainted with the behaviour rules to be followed in case of electrocution.
5 - Keep the phone number of the electricity company and of the nearest first aid station at hand.
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If the work equipment gets accidentally entangled in the cables, the operator must not leave the cab until the
electricity company has insulated the line.
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When carrying out this kind of operations, warn everyone standing in the work area to keep a safety distance
from the machine and the work equipment.
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Ask the electricity company in advance the voltage of the cables and the minimum safety distance.
DANGER
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The minimum distances from overhead lines can vary in the different countries, according to the climate
and to the humidity percentage in the air.
Indicatively, the distances indicated in the following table should be respected.
Cable voltage
Min. safety distance
1.0 kV (distribution line) 5 m
6.6 kV (2–3 insulators) 5.2 m
33 kV (min. 3 insulators) 5.5 m
66 kV (min. 6 insulators) 6 m
154 kV (min. 10 insulators) 8 m
275 kV (min. 19 insulators) 10 m
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