Running cables in a duct
Make sure to separate high-interference cables from equipment susceptible to interference.
Cable types
Cables emitting interference: Motor cables, particularly motors supplied by variable speed drives, energy cable
Cables susceptible to interference: Control cables, extra-low voltage cables, interface cables, LAN cables, digital and analogue signal cables
Cable segregation
Both cable types can be routed in the same cable ducting, but in different compartments.
If ducting with three closed sides and a partition is not available, separate the interference-emitting cables from other cables by a minimum of 150 mm or route in separate ducting.
Cross high-interference cables with equipment susceptible to interference only at right angles.
When, as an exception, signal and interference-emitting supply cables are run in parallel, the risk of interference is very high. In this case, limit the cable length of the positioning signal line DC 0...10 V for modulating actuators.
Unshielded cables
We recommend to use unscreened cables. When selecting unscreened cables, follow the manufacturer's installation recommendations. In general, unshielded twisted-pair cables have sufficient EMC characteristics for building services (incl. data applications) as well as the advantage that no provision is required for coupling to the surrounding earth.