In a modern home, installing a doorphone is not a luxury, but a necessity. After all, he protects us from getting into the house of uninvited guests, and those whom we are happy to see will always let in. It is very important that, in addition to the screen, the lock and the camera, the cable for the doorphone is properly matched, since it transmits the signal from the visitor to the subscriber and vice versa.
What cable is needed for a doorphone?
Depending on whether the intercom is connected in the apartment building or the cable is selected in the private sector. So there are cables with a single-core and multi-core cables. The former have high rigidity, and the second ones are easy to work with, since they are more flexible. The cable for the door phone, consisting of several cores, has an interesting structure inside it - each separate wire is sealed in a colored braid. It does not allow the wires to come in contact with each other, and also protects them from external exposure to moisture, sun, frost and other. In multi-storey houses, often lay a cable with a twisted pair.
Close to high voltage power lines, installing a doorphone can be problematic due to interference from the power line. Possible false calls, spontaneous activation of the lock dog and other unforeseen situations.
To avoid this in such areas, it is recommended to install a shielded cable in which the screen will reflect all sorts of electromagnetic interference from the outside.
For a video intercom, you will need a special cable with cores of different thicknesses so that the video signal is of good quality. As a rule, they are made of copper, but there are also aluminum. A street cable for a doorphone, if the ringing device and the receiver are located not more than 50 meters apart, it is better to buy a coaxial, larger section, because the higher it is, the longer it can be stretched without losing signal quality.
The choice of cable for each specific situation depends on many factors, which only a specialist can take into account. This means that it is better to entrust such a responsible business as installing a door phone to firms that provide similar services.