Siemens Sivacon S8, Планировочная информация

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SIVACON S8 Planning Principles – Further planning notes
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Tab. 8/3:
Normal service conditions for SIVACON S8 switchboards
Environmental
conditions
Class
Environmental parameters including their limit values
(Definition acc. to IEC 60721-3-3)
Measures
Climatic 3K4
Low air temperature -5 °C
1),3)
High air temperature
+40 °C
3)
+35 °C (24 h mean)
2),3)
Low relative humidity 5 %
High relative humidity 95 %
Examples for relation (air temperature - air humidity)
at 40 °C: 50 %
3)
at 20 °C: 90 %
3)
Low absolute humidity 1 g/m
3
High absolute humidity 29 g/m 3
Speed of temperature change 0.5 °C min.
Low air pressure 70 kPa
High air pressure 106 kPa
Sunlight 700 W/m
2
Heat radiation None
Condensation possible
Install switchboard
heating
Wind-borne precipitation No
Water (except rain)
See special service
conditions
Ice formation No
1) According to IEC 60721-3-3, a minimum temperature of +5 °C is permissible.
2) Higher values are permissible on request
3) Data in accordance with IEC 61439-1; any other, not identified values in accordance with IEC 60721-3-3
8.3 Environmental conditions
The climate and other external conditions (natural foreign
substances, chemically active pollutants, small animals)
may affect the switchboard to a varying extent. The influ-
ence depends on the air-conditioning equipment of the
switchboard room.
According to IEC 61439-1, environmental conditions for
low-voltage switchboards are classified as:
• Normal service conditions (IEC 61439-1,
section 7.1)
• Special service conditions (IEC 61439-1,
section 7.2)
SIVACON S8 switchboards are intended for use in the
normal environmental conditions described in Tab. 8/3.
If special service conditions prevail (Tab. 8/4), special
agreements between the switchboard manufacturer and
the user must be reached. The user must inform the switch-
board manufacturer about such extraordinary service
conditions.
Special service conditions relate to the following, for exam-
ple:
• Data about ambient temperature, relative humidity and/
or altitude if this data deviates from the normal service
conditions
• The occurrence of fast temperature and/or air pressure
changes, so that extraordinary condensation must be
expected inside the switchboard
• An atmosphere which may contain a substantial pro-
portion of dust, smoke, corrosive or radioactive com-
ponents, vapours or salt (e.g. H
2
S, NO
x
, SO
2
, chlorine)
The occurrence of severe concussions and impacts is con-
sidered in the section Chapter 9.3 "Seismic safety and
seismic requirements".
In case of higher concentrations of pollutants (Class > 3C2)
pollutant reducing measures are required, for example:
• Air-intake for service room from a less contaminated
point
• Expose the service room to slight excess pressure (e.g.
injecting clean air into the switchboard)
• Air conditioning of switchboard rooms (temperature
reduction, relative humidity < 60%, if necessary, use
pollutant filters)
• Reduction of temperature rise (oversizing of switching
devices or components such as busbars and distribution
bars)
Further information is available from your Siemens contact.