Running cables in a duct
Notes on EMC optimization
Make sure to separate high-interference cables from equipment susceptible to
Cables emitting interference:
Cables susceptible to interference:
You can run both cable types in the same cable ducting, but in different
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
Cross high-interference cables with equipment susceptible to interference only at
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.
We recommend to use unshielded cables. When selecting unshielded 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
Determining the actuator
Selection of the actuator depends on several torque factors. After obtaining the damper
torque rating [Nm/m
] from the manufacturer and determining the damper area,
calculate the total torque required to move the damper as follows:
= Torque rating [Nm/m
Instead of the torque rating, the total torque can also be determined from the
manufacturer's sizing diagrams.
Actuators without spring return GEB...1
Motor cables, particularly motors supplied
by variable speed drives, energy cable.
Control cables, extra-low voltage cables,
interface cables, LAN cables, digital and
analog signal cables.
× damper area [m