Identification of suspected leakage accidents

Electric leakage accident refers to the phenomenon that insulation damage or destruction occurs in electrical equipment or electrical circuits, causing current to flow abnormally through the insulating material to the earth or other conductors. Leakage accidents usually occur under the following circumstances: insulation damage, humid environment, and equipment failure. Electric leakage accidents may lead to serious consequences such as electric shock accidents, circuit short circuits, equipment damage and even fires.
Zhongke Testing and Appraisal Institute can provide identification services for suspected leakage accidents and make accurate identifications on trace evidence analysis and accident cause analysis in various suspected leakage accidents.

1, short-circuit leakage
The insulation material between the live wire (including motors, transformers, etc. connected to the live wire) and the home appliance shell is severely aged and damaged, resulting in direct connection. This kind of leakage is very dangerous and may endanger the life of the person who gets electrocuted.
2, High Resistance Leakage
Due to humid environment or long-term use, the insulation resistance of electrical appliances decreases. You may be able to feel the existence of this leakage by touching the outer casing. In serious cases, it can harm the human body.
3, capacitive leakage
There is a certain capacitance between the live wire and the electrical casing, and the leakage caused by AC power passing through this capacitance. The voltage of this leakage may be high, but the energy is tiny. Generally it will not cause death by electrocution, but it will cause possible burns.

A worker suddenly fainted in the equipment working area of a certain testing center. At the time of the incident, the victim and a co-worker were sitting side by side on a wooden box. While the victim was sending a message on his mobile phone, he suddenly fell forward and fell to the ground. Immediately, several co-workers shut down the machines nearby and rushed over to assist with medical treatment. They took him to a nearby medical room, thinking he was suffering from heat stroke. They took heat-relieving drugs and then called 120 for treatment. He died after resuscitation failed.
Our company was entrusted by the client to conduct technical appraisal and inspection on a sudden fainting and death accident that occurred in a certain testing center, to find out the cause of the accident and to determine whether the accident was caused by electric shock.
identification analysis results:
Our company's identification personnel went to the site to conduct an inspection. The analysis of the causes of the "suspected leakage accident" is as follows:
The wiring inside the distribution box is neat and standardized, and the connection is stable and reliable. The protective ground wires of all electrical equipment are connected to the grounding terminal block and grounded.
test button of the two-stage series-connected residual current action protection device in the main and distribution power boxes can operate quickly. Even if the equipment has leakage and a person touches the electrical equipment and its related metal parts, the residual current action protection device will immediately disconnect the circuit without causing personal injury to the person who gets an electric shock.
In addition, our technical staff also simulated the sitting posture of the victim at the time of the incident and verified that a worker and the victim had been in physical contact. According to the worker's statement, he did not feel any electric shock at the time of the incident. Eliminate the possibility of electric shock to the victim.