Technical - structural defects of the machinery, equipment, handling systems, electric fault condition, the lack of fencing or defective condition or safety devices;
hygiene - the deviation from the norms of the state of air (temperature, humidity, air velocity), poor lighting, the presence of noise, vibration, electromagnetic radiation, fumes, gases, dust, heat, unsanitary condition of production facilities, not meeting the requirements of sanitary norms and rules. The greatest number of injuries occurs during the construction and operation of linear communication structures due to non-victims of TB and the rules for mail delivery of non-compliance with traffic rules postmen.

ELECTRICAL FUNDAMENTALS.
Security - a system of organizational and technical activities and facilities ensuring the protection of people from the dangerous effects of electric current, electromagnetic fields and static electricity.
Electric current flows through the human body, if there is a potential difference.
The current flowing through the human body, it has harmful effects. Biological effects of current shows in there that runs through the muscle, it causes an involuntary decrease.
The electrolytic effect is that the electric current causes the expansion of the blood changes its composition.
The following types of electric shock burns, metal skin, electric signs, elektrooftalmiya, electrical shock, mechanical damage.
Electrical burns occur when the thermal effect of electric current. The most dangerous are burns resulting from the electric arc, as its temperature can exceed 3000 ° C.
Elektrometallisation skin - penetration into the skin by an electric current of tiny particles of metal. As a result, the skin becomes conductive, i.e., its resistance drops sharply.
Electric signs - patches of gray or pale yellow, occur in close contact with live parts (for which in operation an electric current flows.) The nature of electric signs has not been adequately studied.