hager univers FW, Manual

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Glossary
126 Technical changes reserved
11 Glossary
Degree of pollution
The degree of pollution defines the ambient conditions of a switching device. If
the switching device is installed in a housing, the ambient conditions within the
housing apply. The degree of pollution according to EN (IEC) 61439 refers to the
ambient conditions that are intended for the switchgear and controlgear
assembly. The four defined degrees of pollution are used to assess the
clearances and creepage distances in the micro environment.
-
The degree of pollution 3 is defined as conductive pollution or dry,
non-conductive pollution, which is expected to become conductive due to
condensation.
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The degree of pollution 2 is defined only as non-conductive pollution in
which, however, temporary conductivity can be expected due to
condensation.
Distribution boards intended to be operated by ordinary persons (DBOs)
to EN (IEC) 61439-3
According to EN (IEC) 61439-3, a DBO is a distribution board intended to be
operated by ordinary persons. This is a switchgear and controlgear assembly for
distributing electrical energy for applications in residential areas and other
locations where operation is intended by ordinary persons.
The distribution boards are manufactured and tested for operation by ordinary
persons (DBO) according to EN (IEC) 61439 Part 1 and Part 3. Part 3 of the
standard 61439 defines the specific requirements for distribution boards for
operation by ordinary persons (DBO).
A switchgear and controlgear assembly that allows operation by ordinary persons
must include a type plate that specifies the standard EN (IEC) 61439-3 (VDE
0660-600-3) as the applied standard.
Characteristic features of such a switchgear and controlgear assembly:
1. They are intended for operation by ordinary persons, including switching
operations and changing fuse inserts. They are applications in residential
areas or similar household applications in a functional building.
2. Outgoing circuits are installed with short-circuit protection devices in-
tended for operation by ordinary persons; in line with e.g. IEC 60898-1
(miniature circuit breakers/MCBs), IEC 61008 (residual current operated
circuit breakers, RCCBs), IEC 61009 (residual current circuit breakers with
overcurrent protection, RCBOs), IEC 62423 (type B RCCBs and RCBOs)
and IEC 60269-3 (D fuse inserts for use by ordinary persons). Additional
information is provided in Section 8 of EN (IEC) 61439-3.
3. Their rated voltage to earth does not exceed 300 V AC.
4. The rated current (I
nc
) of the outgoing circuit is 125 A maximum; the rated
current of the switchgear and controlgear assembly (I
nA
) is 250 A maxi-
mum.
5. The switchgear and controlgear assembly is intended for distributing
electrical energy and may also include the appropriate controlling and
signalling devices.
6. The switchgear and controlgear assembly is closed and fixed.
7. The switchgear and controlgear assembly may be intended for indoor or
outdoor installation (if with the univers N interior equipment system: in-
door installation).
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The protection type of a DBO for indoor installation must be at least IP2XC.