CLASSIFICATION OF PREMISES FOR ELECTRICAL.
Electrical Safety Service is largely dependent on the nature of the environment.
Room environment, in which there are electrical, can be devastating act of isolating the equipment and thereby create conditions conducive to the defeat of the people of electric shock.
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For example, the heat and humidity lead to a rapid deterioration of electrical insulation and to reduce the resistance of the body.
With regard to danger of electric shock people Regulations for Electrical Installation (PUE) identified three classes of premises: Rooms without high-risk, high-risk areas with extremely dangerous premises.
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The first class includes dry space in which the relative humidity exceeds 60%, wet, in which the relative humidity for a long time does not exceed 75% of current non-conducting floors, with a current-conducting dust, cool, With the air temperature to 30 ° C inclusive, and without possible simultaneous touches on the one hand to the metal structures of buildings, machinery, apparatus, having a good ground connection and the other - to the corps of electrical equipment, installations.
Requirements of the class rooms can meet the educational laboratories, provided that the electrical equipment that is not related to land set far enough away from radiators and heating pipes and plumbing.
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If you cannot respect the safe distance of the pipe and risers should be protected with removable wooden bars of sufficient size.
The premises of the second class are characterized by the presence of one of the following conditions, which create an increased risk of: Moisture (relative humidity greater than 75% long), conductive dust (dust technology, released on the conditions of production in such quantity that it can settle on the wires penetrate the machines, devices, etc. and pass an electric current); conductive floors (metal, earth, concrete, brick, etc.), heat (temperature continuously exceeds 30 ° C), the possibility of simultaneous contact person as having a connection with the earth metal structures of buildings, technological devices, mechanisms, and so n. And the metal housings of electrical equipment.
These premises, for example, may be assigned different shop premises, mills, hot shops, studios with electrified machines and uncovered grounded communications, etc.