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Case No.9
Electrocuted while removing dust in
the electrical
distribution room of a hotel |
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[Circumstances of Incident]
This accident occurred in the electrical
distribution room of a hotel where
a chief
electrical engineer was electrocuted
near
the place where disconnecting switch
was
mounted. A building maintenance company
had
dispatched the engineer on the basis
of a
cleaning and maintenance contract for
various
equipment and facilities in the hotel.
The hotel had been closed for three
days
for the inspection and improvements
of boilers, the replacement of tatami
mats
in the guest rooms and upgrading the
bathrooms.
The victim arrived at the underground
machine
room of the hotel at around ten o'clock
in
the morning to observe test of the
boilers
on which maintenance work had been
completed
the previous day. At around 10:30,
he entered
the electrical distribution room after
telling
colleague from the same company that
he intended
to "remove some dust" from
electrical
equipment near the entrance of the
room isolated
by wire netting.
At about eleven o'clock, a loud cracking
sound was heard from the room, the
power
was suddenly suspended and an alarm
started
to ring. When workers working in the
machine
room rushed to open the door of the
electrical
distribution room, they found smoke
filling
and could see the victim's legs on
the floor.
The victim had fallen to the floor
with his
head between an instrument transformer
and
a power transformer. Carbonized pieces
of
fabric were scattered around the engineer's
body and a bamboo stick was found nearby
to which a small piece of cloth was
attached.
In the electrical distribution room,
three
exposed edges of the secondary side
disconnector
for the instrument transformer were
not opened.
Metal fittings attaching the disconnector
edges were fused and broken, and black
burn
marks were found on the frame pipes
supporting
the disconnector.
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[Causes]
The following can be cited as the causes
of this accident.
Some 30 minutes before the accident,
the
victim had told the boiler operators
resident
in the hotel that he intended to dust
electrical
equipment. He is believed to have entered
the electrical distribution room to
which
access was prohibited for others, used
a
bamboo stick to remove dust from various
electrical units, and was accidentally
electrocuted
when he came too close to portions
carrying
a high-voltage charge (6,000 volts).
As the victim was an experienced electrical
engineer with the class-III chief electrical
engineer qualification, it is not certain
why he entered the electrical distribution
room without first tripping the high-voltage
circuit breaker that could be operated
from
outside the room. He is assumed to
have incorrectly
assumed that the power supply to the
electrical
room was suspended as boilers had been
stopped
and were under inspection. In addition,
he
may have been unfamiliar with various
conditions
in the electrical room as he was dispatched
only on a temporary basis, and may
also have
mistakenly believed that the bamboo
stick
used to remove dust was a safe
tool.
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[Type of business] Building maintenance industry
[Type of accident]Electric shock
[Number of victims] One fatality |
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