Maeda MC405C-3 - Page 130

Section 4 – WORKING WITH CRANE Mini-Crawler Crane M A E D A
4-54 1/2019 MC405C-3
Beware of Electrical Cable Above
Fig. 4-139
Fig. 4-140
• Do not let the machine contact with electrical
cables above.
High voltage cables may inflict electrical shock
by mere approaching.
• Persons who sling are likely to suffer electrical
shocks.
Always observe followings to prevent
accidents.
• If the boom or the wire ropes may contact an
electrical cable in the workplace, consult the
electricity company and make sure that the
measures (measures for instance placement of
a guard personnel or application of wrap tubes
and warning tags to the electrical cable)
stipulated by the related regulations are taken
before starting work.
• Put on rubber soled shoes and rubber gloves,
and be careful that the body parts unprotected
by rubber or other insulation do not contact the
wire rope or the machine frame.
• Place a guide and let him/her watch so that the
boom, wire rope or machine frame does not go
near the electrical cable too much.
Before doing so, decide the emergency signs
and other necessities.
• Ask the electricity company for the voltage in
the electrical cables in the working site.
• Ensure the offset distances (safe distance)
shown in the following table between the
boom/machine frame and electrical cables.
Voltage of
Electrical
Cable
Minimum
Safe
Distance
Low voltage
(Distribution
line)
100
･
200V
2m
6,600V 2m
Special
(Transmission
line)
22,000V
3m
66,000V
4m
154,000V
5m
187,000V
6m
275,000V
7m
500,000V
11m
Measures When Charge Accident
Occurs
When an electrical charge accident occurred, do
not panic but calm down, and apply solution by
the following sequence.
1. Report
Immediately report to the electricity company
or related management company, and
receive instructions for the power
transmission stop, emergency procedures
and related.
2. Evacuation of related personnel from vicinity
of machine
Let the related personnel including the
workers from vicinity of the machine to
prevent secondary disasters.
Personnel who suffered electrical shock by
holding a sling rope, guide rope or other
conductor when the machine was charged
should evacuate by his/her own effort.
Do not try to help such person. Otherwise,
secondary electrical shock accident occurs.
3. Emergency procedure
Take the solution by following sequence in
case of urgency where personnel received
electrical shock because the machine was
charged.
(1) If the machine can be operated,
immediately operate the machine to
move the machine constructions away
from the contact and out of the range of
the cause of the charge. Be careful not
to snip the distribution power cable.
(2) Evacuate the machine completely away
from the cause of the charge, make
sure the machine is not charged, rescue
the electrically shocked personnel and
immediately carry to the hospital.