With one set, this achieved with an
enclosure volume dm³.
DIN 61439-1
Section 8. recommend installation that allows
the so-called „chimney effect“. All enclosure parts, such the
seals, are permanently relieved pressure through the constant pres-
sure equalisation. Since this effect occurs regularly, even daily extent,
a considerable volume water may accumulate internally.
This process only reversible limited extent, the water accumulates
in the enclosure. Owing the differences
in temperature, difference also arises the pressure conditions, which
causes the enclosure draw air when the temperature changes. this
enclosure has increased protection rating, will longer
discharge this water with the result that its seal actually has
a negative impact. appreciable pres-
sure differences are required for this.
The next time the temperature increases, the humidity this air con-
denses the cold surface the enclosure, for example the cover. These effects are intensified
by the power loss generated the enclosures.
GEOS Technical Information
OUTDOOR INSTALLATION
Installation the open damp and wet areas and rooms
. Air exchange
also takes place environments with almost constant air humidity and
temperature, the air the interior the enclosure heats up, e. This especially the case locations, where highly
fluctuating temperatures are expected. The high air exchange rate guarantees permanent
exchange the moist air with the surroundings.
The Air ventilation elements therefore have very large, open filter sur-
face that guarantees high air exchange without influencing the air flow. These seals come the size M20, are
fitted the corresponding cable inlet openings the bottom side and
the side surfaces and offer splash water protection IPX4
when properly installed. The continuous and high
rate air exchange allows the interior air mix constantly with the
environmental air and transports the moisture outwards.
If requirements for contact protection foreign body protection
are also imposed the enclosure, for example IP3X, recommend
use Spelsberg ventilation seals.
Recommendation: least one complete air exchange provided
per day via the BEL Air. Any condensate occurring transported
out the enclosure immediately via air exchange. Thus, damage occurs.2 DIN 61439-1 concerns the protection against
contact with live parts and the prevention penetration solid
foreign objects and water.
According DIN VDE 0100-520, precautions must taken with respect
to drainage water water accumulates condensation can
occur within cable and conductor systems.
Protection against condensate water
The more tightly sealed the equipment, for example junction boxes or
distribution boards, the bigger the likelihood condensation
forming.2.g. These should opened
in such way that the installed state they are the bottom side of
the enclosure and have wall clearance mm, that any
condensation may drain off.68
AK Air and BEL Air ventilation elements
The Air ventilation element prevents condensate water, while maintaining
the high IP65 protection rating. Spelsberg junction boxes in
the various product groups have break-out condensation openings on
the rear the enclosure mounting surfaces. However, with the pressure equali-
sation elements exactly these appreciable pressure differences that
are required, least temporarily, order achieve air exchange. This only applies under the condition
that increased demands are imposed with respect protection
against accidental contact foreign bodies IP2X dust protection). addition, stated that closed switchgear
assemblies must protected from condensate inside the enclosure,
without changing the type protection.
due the components.
The constant pressure equalisation prevents pressure differences,
thus ensuring that mechanical forces can exerted the enclosure
and seals
