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Mounting and installation information for junction boxes
1.3. Protection against high temperatures
During operation, electrical devices require loss power.
This factor must always be observed, whilst taking the
ambient temperature and the installation type into ac-
count.
Switching device combinations are designed for ambi-
ent temperatures between –25 °C and +35 °C (over
a maximum period of 24 hours). Brief heating up to
+40 °C is not problematic. Even if OBO Bettermann
junction boxes are suitable for temperatures of –40 °C to
+80 °C, the manufacturer's specifications and the speci-
fications of the appropriate product safety standard must
be checked for the installed devices.
Sunlight or other heat sources can lead to improper in-
ner temperatures, which must be avoided at all costs.
Otherwise, the safe function of the electrical resources
may not be guaranteed.
According to VDE 0100-520, 522.1.2, cable systems, in-
cluding their accessories, may only be operated at ambi-
ent temperatures corresponding to the product standard
or the manufacturer's specifications and may not exceed
the limit values.
1.4. Protection against chemical influences
Installations in areas with an increased concentration of
pollutants in the area may see a restriction of suitability.
The X series from OBO Bettermann is resistant to min-
eral oils and various vegetable and animal fats.
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1.5. Protection against condensation
The tighter the connection sockets or distributor boxes
are closed, the greater the likelihood that condensation
will occur.
This is particularly the case in places where strong tem-
perature variations are to be expected. The formation of
condensation water is increased or amplified by the loss
of power of the electrical resources installed.
This can cause differing pressure conditions, which can
lead to the housing sucking in air when there is a change
in temperature. During a subsequent temperature in-
crease, the moisture located in the air precipitates as
water onto the cold surface of the housing, e.g. on the
cover.
As soon as this effect has occurred multiple times, a con-
siderable volume of water can collect in the housing. The
higher the protection level of the housing, the higher the
volume that can collect in the interior, as the water is no
longer discharged. This means that the tightness may
even have a negative impact and damage may occur.
According to DIN VDE 0100-520, measures must be
taken to remove water, if water or condensation can
occur within cable systems.
Depending on the type, OBO Bettermann's junction
boxes of the various product groups can offer a break-out
or condensation water opening to be pushed in. This is
attached in such a way that possible condensation can
flow out freely at any time, irrespective of whether the
box is mounted horizontally or vertically. Alternatively,
pressure compensation measures can be used, such as
the OBO pressure compensation element.
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