Response and treatment of electric shock in electric safety

Many of us have been electrocuted, and when we do, we bounce off pretty quickly. Only the place where the electric shock (usually a finger) rebounds, otherwise the whole person will fly out. But there are also some cases, especially serious injuries and deaths caused by electric shocks, which we have not experienced, but we often see in the news or videos that electric shocks cannot be separated from the power source, but are sucked in. Why does the same electric shock produce two opposite states?

Response and treatment of electrical safety electric shock

Reason 1: Stress Reaction

The electric current caused by the physiological and psychological reaction caused by electric shock can cause muscle spasm and paralysis in the human body.

After a person gets an electric shock, twitching and curling up will naturally occur at the place of electric shock. Take the hands and arms, the parts that get the most frequent electric shocks, as an example: when our hands get an electric shock, the hand will naturally clenched into a fist; when the arm gets an electric shock, the arm will curl inward.

If the shock is on the outside of the arm, the arm curls up after the shock and can be detached from the power source. We think of this as "bounce", when in fact it's not passive, it's the arm getting out of the way. However, if the palm, fingers or the inside of the arm get an electric shock, after the electric shock, due to clenching the fist and bending the arm, the wire will be caught, making it impossible to get rid of the electric shock. The longer the shock lasts, the less likely the hand will be pulled back.

Therefore, the so-called "sucking" is not a passive one, but requires the hands of our students to hold the power supply after the electric shock. General low-voltage control circuits or high-voltage system circuits are in contact with electric shock, whether it is electric injury or slight numbness, generally speaking, it is the company's response to the stress of the social body. Experienced electricians will cleverly use various post-shock convulsions to cause this problem. It is common to lightly touch the wires with fingernails to test the module circuit after the power is turned off and the people around them do not have electric pens. Whether the design is powered down successfully. Instead of disconnecting the switch and starting construction directly like our country.

Response and treatment of electrical safety electric shock

Reason 1: Magnetic field effect

The above paragraph refers to the electric shock caused by touching the power supply, but in a high-voltage circuit (generally greater than 10kV), if you do not touch the power supply, electric shock may occur. High-voltage non-contact electric cutting is divided into two types: arc electric cutting and step electric cutting.

Arcing is the electrical shock that occurs when a person is near a wire but does not touch it. Due to the large voltage of the high-voltage line and the strong magnetic field, the human body will generate induction electricity. Electric current in the human body can also form a magnetic field. At this time, the two magnetic fields repel each other, and the person is bounced away (actually, it is better called "blow"). In this process, an arc (electric spark) will be generated between the person and the wire, and a "bang bang" sound will be issued. At this time, although the person was bounced away, due to the high voltage generated by the huge current, otherwise the person would have more serious burns. At this moment, it may be fatal. That's why it says "Keep away" next to high voltage wires.

2. Stepping electric shock refers to the high-voltage electrical conductor in the power supply, which is directly connected to the earth (such as a wire falling to the ground). At this point, the earth is full of voltage. If a person has only one fulcrum on the ground (one foot is on the ground), the current cannot enter the human body through this fulcrum and then come out from the human body, and will not form a loop and get an electric shock. But when people keep their feet on the ground, it's a completely different story.

Response and treatment of electrical safety electric shock

The ground potential centered on the wire gradually weakens outward. When we have two legs, one near the center of the circle and one far away from the center of the circle, there will be a potential difference between these two legs, thus creating a voltage. Thus, the human body forms a path that generates electricity starting from the feet. In this case, the person is statically stiff, so he cannot escape the shock. This form of shock, in which two steps are stepped to produce a voltage, is called a step voltage. In fact, not just the feet, as long as the two fulcrums of the body are on the ground, this form of electric shock can be produced.

So, if someone has the misfortune of being electrocuted, how can we help them?

REMEMBER: Never try to pull an electrocuted person directly off the circuit with your own hands, as you may be drawn, which is very, very dangerous. The correct way is to use dry bamboo poles or wooden sticks to cut off the wires on the person who gets an electric shock. Just be sure not to let the dangling wire touch you. For the electrocuted person who has been unconscious and the heart has stopped beating, artificial respiration should be used to wake him up as soon as possible, so as not to delay too long and lose the best time for rescue. Dial 120 as soon as possible, cherish life, everyone is responsible!