Building intercoms are a simple way of communicating in buildings. Such systems comprise not only the intercom itself but also receivers, turning stairway lighting on or off, door openers and door bells and combine all these basic functions in such a way as to require a minimum of wiring. The building intercom system plus other installation and communications equipment can be combined to create extensive educational projects. The particular challenge for trainees lies in the installation of circuits at various voltages.

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