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Siemens Wall-mounted sensors and room operator units for KNX/ETS and KNX/ACS CM2N1602en_05
Building Technologies Safety and EMC optimization 2018-09-14
2 Safety and EMC optimization
2.1 Notes on safety
This section explains general and system-specific regulations for mains and
operating voltages. It includes important information for your safety and the safety
of the entire plant.
P
lease comply with the following general regulations during engineering and
execution:
• Electrical and mains power ordinances for the given country.
• Other applicable, national regulations.
• Building installation regulations for the given country.
• Regulations of the utility company.
• Diagrams, cable lists, dispositions, specifications, and orders by the customer or
authorized engineering office.
• Third-party regulations, e.g. by the general contractor or building owner.
T
he electrical safety for building automation and control systems by Siemens is
essentially based on safely separating low voltage from mains voltage.
2.2 Device-specific regulations
Note permissible line lengths and topologies when planning and installing
controllers and field devices featuring KNX bus connection. Make sure the bus
supply complies with the KNX standard.
Do not open the device.
The device is maintenance free. Only the manufacturer can repair the device.
2.3 Notes on EMC optimization
When setting up cable ducts, separate strongly interfering cables from susceptible
entities.
• Interfering cables: Motor cables especially from motors supplied by inverters,
energy-supplying cables.
• Susceptible entities: Control cables, low voltage cables, interface cables, LAN
cables, digital and analog signal cables.
• B
oth types of cables may be in the same cable duct, but in separat
e
c
ompartments.
• If no three-sided, closed duct with separating wall is available, the interferi
ng
c
ables must be separated by at least 150 mm from the others or placed i
n
s
eparate ducts.
• Crossings of strongly interfering cables with possibly susceptible entities must
be at a right angle.
• In exceptional cases, signal and interfering power cables may be run in parallel,
resulting in a high interference risk.
W
e recommend to generally use unscreened cables. Comply with the
manufacturer's installation recommendations for selecting unscreened cables. In
general, unshielded twisted pair cables have sufficient EMC properties for
technical building applications (including data applications) and do not require
consideration of coupling to surrounding earth.
Please comply
with these notes
General
Warning,
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