Conventional Systems Technical Manual - Alcad

6DIAGRAMSGENERAL POINTS CONCERNING INSTALLATIONSPOWER SUPPLY UNITSRecuerdeRemember to protect the power supply units of the installation by complying with regulations in force governing electricalinstallations (keep away from strong magnetic fields and high temperature locations, ensure correct fusing, etc).Choose a dry, well-ventilated place away from direct sources of heat. Avoid blocking the ventilation slots.DISTRIBUTION OF THE VIDEO SIGNALIn video door entry systems, it is recommended that the video signal be distributed using tap-offs and splitters.If the installation does not permit distribution to be made with tap-offs, you can join the connection brackets in cascade.Next tap-offNext monitorConnection bracketdwelling 2DIV-024Connection bracketdwelling 2Connection bracketdwelling 1Connection bracketdwelling 1INSTALLATION WITH TAP-OFFINSTALLATION WITHOUT TAP-OFFWIRINGTo ensure the correct functioning of the installation, it is essential that the cable used be of the correct section and characteristics.POWER SUPPLYTo avoid problems with the audio caused by possible inductions between the power supply wires and the other wiring of the electronicdoor entry or video door entry system, it is recommended that a separate cable hose be used to feed the entrance panel.SECTIONSTwo factors directly affect which section of cable should be used: the distance between the different elements of the installation tobe connected; and the number of monitors, telephones and call wires associated to the same call wire.All the diagrams in the present chapter include a table showing the minimum size of sections which can be used, depending on thedistances and the number of devices which are to be installed in the dwelling.For distances different to those shown in the diagrams, consult the manufacturer.196