1. The accident happened when two new households moved into the dormitory building of a family member. On the second day, they found that the water pipes, toilets and cement floors of the kitchen were sometimes electrified. They asked the electrician to check them. They also did not find any contact between the water pipes and the electric wires, and the neutral wires were not found electrified by the written test.
2. The analysis of accident causes shows that there are reserved holes in the upper and lower water pipes of the building where they pass through the floor. Because the steel bars of the porous cement slab are exposed to the water pipes, if the water pipes or the steel bars of the floor are contacted with the charged bodies, then both of them will be charged. Now the floor and water pipes are electrified, so there must be contact with electrical equipment. According to this judgment, the electrician went to the two new households to find out the reason. During the search, it was found that the newly moved Zhao family had installed a new ceiling lamp. When opening and inspecting, it was found that when installing the ceiling lamp holder, a small wooden plug was used to hit the floor seam. When installing the lamp holder, the wooden screw was not screwed in the center of the cork, so that the wooden screw was directly roofed on the steel bar of the floor, while the exposed part of the phase wire head of the lamp connection was longer. After pressing with the screw, the surplus part of the ceiling lamp was touched on the wooden screw, so the whole floor, together with the water pipes contacting the upper and lower parts, were also Electricity. Because the floor of kitchen and toilet is wet and cement slab, the phenomenon of live electricity is serious. Because the switch of the lamp is controlled by the phase line, there is no live phenomenon when the lamp is not turned on.
3. Accident Countermeasures
(1) When users install electrical equipment and lighting power, they should seek electricians.
(2) People who do not know electrical knowledge should not change the electrical circuit at will.
(3) Strengthen the propaganda of users'safe use of electricity and raise their safety awareness.
(4) The drawings of new buildings should be examined by electricians. In the construction plan of the acceptor, the reserved holes should be made in the civil construction, and the reinforcement bars of the buildings should be connected together with good grounding to ensure the safe use of electricity.