Chapter 4. Door Station Installation
IP Video Door Station Installation User Manual
12
Recommendations on twisted pair cable routing:
In corridors, it is advisable to install electric and feeble-current cables in different
conduits that are disposed on different walls.
Twisted pair and electric cables can be installed in the same conduit using different
sections of the cable that have solid longitudinal partitions with at least 0.25 h of fire
resistance, which are made of non-combustible material and should be positioned in
work areas at distance of 15 meters maximum if the electrical power does not exceed 5
kW.
Electric and feeble-current cables should be placed in parallel to each other at distance
of at least 50 mm in different conduits or different sections of conduit. If the electric field
strength from the electric cables exceeds 3 V/m, you should increase the distance
between the electric and feeble-current cables or reduce the electromagnetic noise.
Twisted pair and electric cables should cross each other at right angles.
Unshielded twisted pair cables should be located at distance of at least 125 mm from
fluorescent gas-discharge lamps or from other high-voltage discharge devices.
Unshielded twisted pair cables should be located at distance of at least 1.5 meters from
electromagnetic interference sources that produce electric field strength exceeding 3
V/m.
Switchboards with pinned unshielded twisted pair cables should be located at distance
of at least 3 meters from electromagnetic interference sources that produce electric field
strength exceeding 3 V/m.
Entire twisted pair cables should be arranged between the points of connection so the
cable run is as short as possible.
Minimum cable bending radius is four times the cable diameter (or 1 inch=2.5 cm) or it is
also acceptable to install the cable so that the cable bending radius is 2 inches (5 cm).
Maximum length of the entire segment is 100 meters.
