When attempting to drill a fire protection material with a threaded rod , there happened to be an unintentional forming of a current circuit and, consequently, the body current flowing on a trainee.
Work Order.
From an electrical operating room of a printing and publishing center, two lines and equipotential bonding should be laid to the neighboring hall. The wall between both rooms was a fire-proof wall. Therefore, the opening through which the already installed cables were passed had been sealed with a fire protection material.
This opening should also be used for the new feeder lines. It was about 4 m high and was difficult to access due to the surrounding sheet steel plate. An electrical installation company was commissioned to do the work , which also employed an apprentice as aide to an experienced technician. A special risk assessment for opening a fire enclosure was not made by the company.
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| The Cable Damaged byThreaded-Rod |
The Accident.
As happened several times in previous works in the firm, the technicians wanted to drill the fire protection materials with a threaded rod. The wall had at this point a thickness of about 60 cm. Despite great effort, the two failed to break the corresponding opening in the fire protection compound. The technician therefore went to the workshop car and wanted to get a hammer and chisel. The apprentice kept on trying to drill the opening with the threaded rod. When the technician returned from the car, his colleague lay unconscious on the floor. He immediately called the ambulance and provided first aid. Fortunately, the apprentice could be rescued by the quick help.
Cause of The Accident :
The accident investigation showed that during the further "drilling" with the threaded rod, an electrical line which is under voltage was damaged. The apprentice had held the metal plank with one hand during the work. Through the threaded rod, which he held with his other hand, and the plane a body flow came about. The current was cut off when he collapsed and fell off the ladder.
Conclusion:
Ultimately, § 7 "Working near active parts" of the DGUV regulation 3 also applies to this work. Since the cables already laid in the fire barrier were not disconnected from the supply, such a serious accident could only arise. A far-reaching "poking around" in such a fire-wall opening is also very dangerous because the line course within the opening is not known exactly. The safest solution is to drill a new hole
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