Identification of the cause of suspected electric shock accident

The so-called electric shock means that the human body touches a charged object, and the charged object discharges to the human body smaller than a safe distance, and when arc flashover affects the human body, the current passes through the human body and the earth or other conductors, or distributed capacitance to form a closed loop, causing the human body to suffer varying degrees of harm.

Zhongke Testing and Appraisal Institute can provide identification services for suspected electric shock accidents, and make accurate identifications of trace evidence analysis and accident cause analysis in various suspected electric shock accidents.

1. The installation of electrical equipment is unreasonable, and most of them have installation violations. For example, the crossing distance between conductors does not meet the regulatory requirements; power lines and weak current lines are erected on the same pole; the horizontal or vertical distance between the conductors and the building is not enough; insulators are not installed on the pull wires; electrical equipment is poorly grounded causing leakage; the light switch does not control the phase line and the temporary power consumption is irregular, etc.

2. Lack of awareness and knowledge of safe use of electricity. Such as building a house or digging a well under the power lines; drying clothes on the power lines; fishing with electricity; repairing switches or installing and disassembling light bulbs under electricity, etc.

3. Failure to comply with safe work systems. For example, when the staff were inspecting electrical equipment, they violated regulations, did not apply for work tickets or operation tickets, and pulled and closed the isolating switch without authorization; without confirming the on-site situation, they notified by phone or made an appointment to stop or send power; they did not check electricity, install grounding wires, or hang signs at the work site and in the power distribution room.

4. Electrical equipment is not maintained in a timely manner, and the equipment is running sick. For example, the residual current action protector fails and power is forcibly transmitted; the insulated wire is damaged and the core is exposed; the motor is damp and the insulation is reduced, causing the shell to be charged; the pole is severely cracked, and the wire is aging and loose, etc., which are all causes of electric shock accidents.

According to the on-site client's statement, an electric shock accident occurred in the company involved. The electrician involved was accidentally electrocuted while repairing lighting downlights on the ceiling of the exhibition hall.

Our company was entrusted by the client to identify the cause of the "electric shock accident" of a certain company.

Appraisal analysis results:

Our appraisers went to the scene to conduct an inspection. The analysis of the causes of the "electric shock accident" is as follows:

The bathroom involved was small and had no windows. When the victim was bathing in the bathroom, he closed the bathroom door tightly, making the bathroom a relatively airtight space.