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Classification of premises by humidity, temperature and dust content

Production room with industrial hoods

Below is a brief description of real estate for industrial purposes. Information may be interesting in particular for future tenants of communal property.

Humidity and room temperature

Dry are those premises in which the relative humidity does not exceed 60%. Such parameters are inherent in most real estate for administrative purposes.

Wet premises are those objects in which vapors or condensed moisture are released only briefly and in small quantities. And the relative humidity is more than 60%, but does not exceed 75%. Similar characteristics can be in specialized facilities, for example, in laundries, in particular in dormitories.

Damp are premises in which the relative humidity exceeds 75% for long periods of time. An example can be objects where economic activity is carried out to grow crops such as mushrooms. Or greenhouses for the manufacture of a wide range of crops that require high humidity for good growth.

Especially damp premises are real estate objects in which the relative humidity of the air is close to 100% (ceiling, walls, floor and objects in the room are covered with moisture).

Hot are called premises in which, under the influence of various thermal radiation, the temperature exceeds constantly or periodically (more than 1 day) +35 °C. It can be, for example, rooms with dryers, drying and burning furnaces, boiler rooms. Also in the summer under this type can fall spaces of attics.

Dust and electric current

Dust are objects in which, according to the production conditions, process dust is released in such an amount when it can settle on wires, penetrate into machines, apparatuses, etc. Usually this is a production property where machines work, for example, for working with wood.

Dusty real estate objects are divided into:

  • premise with conductive dust;
  • premise with dust which does not conduct electric current.

Premises with a chemically or organically active environment are objects in which aggressive vapors, gases, liquids are constantly or for a long time contained, deposits or mold are formed. These external factors can destroy insulation materials and parts of electrical equipment, in particular those under voltage.

In terms of explosion or fire hazard, rooms are explosive (there are six classes) and fire hazardous (four classes are distinguished).

Staff safety

Regarding the probability of personnel electric shock, the distribution is:

  1. Non-hazardous premises with no high risk conditions.
  2. Premises with increased danger, characterized by the presence of one of the following conditions in them, creating an increased danger:
    • dampness or conductive dust (relative humidity exceeds 75%);
    • conductive floors (metal, earth, reinforced concrete, brick, etc.);
    • high temperature (more than 35 °C);
    • the possibility of simultaneous human contact with several metal elements, which can lead to electric shock.
  3. Especially dangerous premises, characterised by the presence of such characteristics that can pose a very high danger of:
    • special dampness;
    • chemically or organically active environment;
    • simultaneously two or more high-risk conditions.
  4. Places where a variety of electrical outdoor equipment is located. With regard to the danger of electric shock to people, such objects are particularly dangerous areas.