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D-78
Thermal management
of switchboards
General
Additional informations
Thermal characteristics of
switchboards
A switchboard is designed for operation under normal ambient conditions.
Most devices do not operation correctly outside a temperature range of -10 and
+70 °C.
It is therefore important to maintain the switchboard internal temperature within this
temperature range by:
correctly sizing the switchboard during design
correcting the temperature using suitable means.
b
b
Management of the internal
temperature
Cooling
There are a number of way to dissipate heat from the switchboard.
The drawings below present the various means.
Convection
Forced-air ventilation
DD381484
DD381483
DD381482
DD381481
IP > 31
IP
y
31
IP
y
54
IP
y
54
Ensured naturally in Prisma Plus
enclosures
Using fans, it significantly increases the
thermal capacity of an enclosure.
Forced-air
ventilation with
air-air exchanger
Forced
convection and
cooling
DD381920
DD381921
IP > 31
IP > 31
On special request.
For these extreme cases, many installers prefer to set up the switchboards with other
electrotechnical and electronic devices in air-conditioned electrical rooms.
Heating
The means employed to raise the internal temperature in a switchboard is a resistor-
based heater, used to:
avoid condensation by limiting variations in temperature
ensure that the switchboard does not freeze.
b
b