What dangerous current for a person? Deadly and dangerous current values

An electric shock is the shock of a person with an electric shock, after which shock can occur - a severe reaction of the body to the strongest stimulus, which is an electric current. It should be understood that any current is dangerous for human life. In the article we will also answer the question, what current and voltage are dangerous for man.

The outcome of an electric shock

Depending on the situation, the outcome of the shock can be varied. If a person has received a strong electric shock, he may have problems with blood circulation and breathing. In severe situations, heart fibrillation may begin - the cardiac muscle begins to erratically chaotically. Since the heart actually stops working, the flow of blood stops. If the first medical aid is not provided in a timely manner, a person may die.

Electric shocks are most often observed at the moment of human injury with a current of up to 1000 V. Burns can occur when the current is from 1 A and higher. This happens mainly if the person does not follow the basic safety rules when working with a current of more than 1000 V. The current-carrying part is located at a fairly close distance to the human body, between them there is a spark discharge, which leads to severe burns.

If a person accidentally received a spark discharge, the current at the time of connection with the body heats the tissues to 60 °. This leads to protein clotting, and a burn is formed on the affected area. Burns caused by electric shock, cure rather difficult.

Signs of burns from electric shock

There is such a thing as electrical labels. These are dead skin areas of yellowish color, which seem to resemble corns. If the current has penetrated deeply into the skin, then the tissues of the body will eventually die out.

Signs of electric burn:

• The skin in the area of the blow was red;
• Burns began to appear on the burner site with the formation of blisters;
• The tissues in the place of impact were charred;
• In the skin, pieces of metal could fall into the skin when dressing.

The most dangerous thing if an electric shock falls on the area:

• Temples;
• Back;
• Brushes of hands;
• Shins;
• Occiput;
• Neck.

Classification of electric current in terms of human exposure

The electric current differs in its degree of effect on a person. He can be:

• Tangible;
• Not being dissolved;
• Fibrillation.

A sensible is called an electric current, upon impact of which a person feels an obvious irritation. Feel the shock of the current can be at 0.6 mA.

Non-emptying - an electric current that causes involuntary convulsive movements of limbs that touch bare wires.

Alternating current, passing through the cells of the human body, imparts impulses in which a person has an effect of adhesion.

The fibrillation current upon impact causes problems with the cardiac system. At this moment a person can die from a cardiac arrest.

Dangerous current

Depending on the situation, a different voltage can pass through the human body, which means that the consequence of the lesion can be diverse. It is necessary to know that a current dangerous to humans has a current strength of more than 15 mA, at which a person is not able to free himself without outside help. The current strength of 50 mA can cause severe damage to health, and in 100 mA, when exposed to 1-2 seconds, it is considered deadly and usually causes cardiac arrest.

The most dangerous current for a person is an alternating one, whose frequency is more than 50-500 Hz. If its value is about 9 mA, a person is able to release himself from the source of damage (wire). It is necessary to understand that for life and health of people there is a danger and a constant current, you can get rid of it only if it does not exceed 20-25 mA.

What alternating current is dangerous for humans?

People who regularly work with electronic and electrical devices know what alternating and direct current is. But not all of them possess information, which one is more dangerous for humans.

It should be understood that electricity is a danger to people, many factors influence this. Such as:

• How long contact lasted;
• The ways in which the current passed through the body;
• What power was the blow;
• Resistance of the human body.

It is considered dangerous for human alternating current. Causes:

• The direct current will have the same force of influence on the human body if it is 3 times more than an alternating current. This happens because the alternating current is much more exciting nerves and stimulates the muscles and heart.
• Death due to a current shock usually occurs as a result of cardiac arrest. The risk of death is most often present when working with alternating current.
• The resistance produced by the human body is higher than the direct current, and the higher the frequency, the lower the resistance.

Hence it becomes clear that an alternating current is much more dangerous for a person's life than a permanent one.

What constant current is dangerous for humans

Danger to humans is represented by both alternating current and direct current. The only thing that is variable is 35 times more dangerous than permanent. It is worthwhile to know that a constant current of 50 mA is considered safe, while for an alternating current this mark is only 10 mA. But the main thing is that the danger of any current depends on its intensity.

It is considered:

• At a voltage of up to 400 V, alternating current is more dangerous;
• If the voltage is 500 V, the current effect is the same;
• At a voltage higher than 500 V DC is more dangerous.

The alternating current beats intermittently, while the constant current flows continuously. When struck by alternating current, there is a chance to break away from the source of the damage. It is necessary to understand that the danger is not only the kind of current that hit the person, but also what area was hit. The most dangerous way is through the heart, the brain, the lungs.

Constant current is dangerous for humans, since electric shocks can result in burns or breathing problems.

Which organs affect electricity?

How badly struck the human body at the time of electric shock, depends on the way the current passed. In practice, there are several options on which current can pass through the body:

• If a person takes a bare wire, which is under tension, with both hands. This way is called hand-hand and passes between the hands, affecting the respiratory system and heart.
• When a person stands on the ground, while touching a bare wire with his hand. The path is called the arm-legs, the current penetrates through the internal organs of the respiration and the heart.
• The worker stands with his feet on the ground, in the area of faulty grounding. The discharge of the current is received by the feet. The current path is called leg - leg.
• When a person accidentally touched the head of the conductive part. The path can be called the head - the hand, the head - the legs.
• The most dangerous ways in which the current can pass through the body are those in which the most important systems for humans are involved.

How dangerous is an electric shock

If the impact of electricity is at a voltage of 500 V, a person will feel pain in the place of touch, in the joints, there will be burns. And also there is a high probability that the breath will stop or the heartbeat will stop.

It should be understood that at a voltage of 500 V, there is virtually no difference between the two types of currents. Between the current that passes through the human body and voltage, there is a nonlinear relationship. Therefore, as the voltage increases, the current increases.

In any case, the force of an electric shock depends only on the individual conditions under which a person has entered the power grid.