We now proceed to designing administrative circuit installations. We select the equipment of administrative rooms with lighting devices and plug sockets. After arranging them, we draw the installation, i.e. we make an administrative installation plan, dividing it into circuits, guided by the following principles:
— jeden obwód może zasilać 20 incandescent lamps,
— jeden obwód może zasilać 30 fluorescent fittings, and in one, and in the latter case, the existing socket is counted as a fitting. Next, we select the type of cables, selection of the cross-section and protection. We place the protections in the building's administrative switchboard.
The same way, if there are force checks, we select connectors, wires and protection of power circuits. We also place the protection of the power installation in the administrative switchboard.
Having selected the number of wlz and the number of administrative circuits, we select the main switchgear set.
Using load calculation guidelines, we select the type and cross-section of the cables supplying the main board and the protection placed in the connector.
Still calculations should be checked, if in the designed installation the voltage drops in the normal operating conditions of the installation do not exceed the values given in the tables. The individual voltage drops may be exceeded provided that the sum of the allowable voltage drops is not exceeded. It still needs to be checked, whether the conditions resulting from the applied electric shock protection will be met.
Permissible voltage drops in power installations with a voltage higher than 42 V.
After all the previously discussed calculations have been made, we proceed to the implementation of the installation diagram- electricity of the building including the connection section, connector, and ending with energy receivers in apartments and administrative units. We mark the meters in the connection diagram, switchboards (type), fuses (type and size), the number and power of individual load circuits, type, the number and cross-section of conductors and the method of routing them.