The effect of electric current on the body, dangerous voltages, currents, frequencies, causes of electric shock.

The action of electric current on the body and electric shock can occur in the following forms: cardiac arrest or breathing during the passage of electric current through the body, burns, mechanical injury due to muscle contraction under the influence of current, blinding by an electric arc. Death usually occurs due to cardiac arrest, or breathing, or both. Alternating current and direct current are almost equally dangerous. 

The effect of electric current on the body, dangerous voltages, currents, frequencies, causes of electric shock.

Skilled workers suffer from electric current and are injured much less frequently than unskilled workers. The point here is not so much in qualifications as in the fact that it is profitable for the employer to spend money only on the labor protection of valuable workers. 90% of injuries are due to poor work organization and only 10% due to the fault of victims.

) factors. Most of all, the central nervous system suffers from the action of electric current. Due to damage to it, breathing and cardiac activity are disturbed. Parts of the body with the least resistance (i.e. more vulnerable).

Lateral neck, whiskey.
The back of the palm, the surface of the palm between the thumb and forefinger, the hand in the area above the brush.
Shoulder, back.
Acupuncture points located in different places of the body.

Electric burns are much more difficult to cure than conventional thermal ones. Some consequences of electrical injury can occur after several hours, days, months. The victim must live sparingly for a long time and be monitored.

Hazardous voltages, currents, electric current frequencies.

There are numerous examples of deaths from electric shocks with voltages of 65, 36 and 12 Volts. There are cases of fatal damage with a voltage of less than 4 volts. There can only be one conclusion: there is no safe voltage. Accordingly, there is no safe electric current. The common belief that current safety is less than 100 milliamps is a dangerous misconception. An AC frequency of 50 Hz is the most dangerous. According to some reports, 400 Hz current is less dangerous.

Causes of Electric Shock.

Induced voltage.

High-voltage AC transmission lines can induce high AC voltage in nearby low-voltage power lines, communication lines, and any extended conductors isolated from earth. May occur even in a car.

Residual voltage.

The power line has a large electric capacity. Therefore, if the line is disconnected from the voltage, for some time the potential difference will still be preserved, and the simultaneous touch of different wires will lead to electric shock. A single discharge of the line using a grounded conductor may not be sufficient. Hazardous residual voltage can be stored in radio equipment that contains capacitors..

Static voltage.

Arises as a result of the accumulation of electric charge on an insulated conductive object.

Step voltage.

It occurs between the legs due to the fact that they are at different distances from the wire that fell to the ground.

Insulation damage.

The reasons may be the following: factory defects, aging, climatic effects, pollution, mechanical damage, for example with a tool, mechanical wear, such as bending, intentional damage.

Accidental contact with live parts.

Due to ignorance, rush, actions of distractions.

Lack of grounding.

In grounded equipment, in the event of an insulation breakdown on the case, a short circuit occurs and the fuses blow.

Short circuit due to an accident.

For example, strong wind or another reason can cause damage to the overhead power line and a wire falling onto a parallel wire of the radio or telephone, after which the wire considered to be low voltage is under high voltage.


One individual works in the apparatus, the other energizes it.

Based on the book Fundamentals of Electrical Safety.
Manoilova V.E..

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