Diagram of electrical installations in an apartment building; 1 - power line, 2 - connection, 3 - connector, 4 - main switchboard, 5 - administrative switchboard, 6 - internal power line, 7 - multi-storey distribution board, 8 - residential switchboard.
The administrative loads are supplied from the building's administrative switchboard located together with the building's main switchboard. All approvals in the building are among the administrative approvals (outside the apartments), which guarantee the proper functioning of the building, so lighting of staircases, basements, attics, power supply for cranes, hydroforu itp.
If the building has more than 4 flats, the following separate circuits must be used:
— oświetlenia klatki schodowej,
— oświetlenia piwnic,
— oświetlenia użytkowych strychów,
— gniazd wtyczkowych,
— odbiorów siłowych.
One of the administrative districts should be connected to the lighting of the police number. Administrative loads should have a separate electricity metering located in the administrative switchboard.
In accordance with applicable regulations, in buildings intended for habitation more than 200 persons, emergency lighting should be used that is switched on automatically. In this case, an independent source of energy that is automatically turned on in the event of failure of the basic lighting of the staircase or corridors may be a transformer other than this one., from which the building is powered, or an accumulator battery.