No. 119 Is it due to the backflow of lightning?
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In December of last year, at the fire headquarters in Noshiro City, Akita Prefecture, there was a problem that the 119 number could not be connected temporarily, the fire headquarters fell on the premises, and the lightning that flowed to the ground flowed back through a device that originally allowed electric current to escape from the building to the ground And summarized the results of a survey that presumed that the telephone line had failed.
In December last year, the fire department in Noshiro City, Akita Prefecture, was unable to use the telephone line to receive the 119 call, and it took about 15 hours to completely restore the situation.
According to the survey, lightning struck the lightning rod on the premises and flowed to the ground, then into a building more than 20 meters away, causing an abnormality in the telephone line, and call 119 could not be connected. .
Then, it is estimated that the lightning current that flowed to the ground flowed into the building as a cause, because a device called `` earth wire '', which was originally buried in the ground to escape excessive current, flowed back to equipment in the building. doing.
In response to the results of this survey, the Fire Department headquarters considered adding additional protection equipment to protect the telephone line, and introduced a system to transfer calls to another fire department in case of a 119 call failure, to prevent recurrence. We are going to take measures for that.