Another group of buildings are non-residential buildings. The term non-residential buildings should be understood as buildings accompanying housing construction. These buildings can be divided into the following groups:
— obiekty oświaty i kultury (schools, before school, cultural centers, china),
— obiekty służby zdrowia (clinics and health centers, nurseries),
— obiekty handlowe i gastronomiczne (shops, equipment repair points, pharmacies),
— obiekty komunalne (telephone exchanges, hydroforn, heat nodes, transformer stations).
Great diversity of construction systems (monolithic, large-block H-frame, wooden prefabrication, etc.) makes it impossible to use one or even several technologies for making electrical installations. Installation requirements are basically independent of the building system, on the other hand, the method of cable routing and the technologies of making individual elements of the installation are fundamentally different for each system. It is limited to providing general rules of performing installations common to all objects.
Usually, a large number of people stay permanently or periodically in non-residential buildings. The loss of voltage in the power grid supplying these buildings may pose a threat to human life or health. For this reason, these facilities require particularly reliable power systems. They should have a primary power supply from the power grid and an automatic backup power supply. The backup power source can also be mains power provided, that it will be independent of the primary power supply, that is, disturbances in the primary power supply will not affect the functioning of the backup power supply.
Some receivers, e.g. Emergency lighting, require the use of a power source that is completely independent of the power grid in the form of a power generator or accumulator battery.
Non-residential buildings are supplied from the local network through cable connectors, which are placed outside the building in a recess closed with a door or inside the building together with the main switchboard. Standard connectors should be used.
Happens often, for urban reasons or as a result of a load analysis, that transformer stations are located in non-residential buildings. In this case, the role of a connector is played by low voltage switchgear busbars in a transformer station.
For loads less than 160 And there are panel switchboards installed in public rooms. In the range of 160 do 400 And the most common solutions are wardrobe cabinets in rooms separated for electric traffic. For loads exceeding 400 And as the main switchgears, free-standing structures are used.