98
SIVACON S8 Planning Principles –
Technical annex
Note: IP2X also covers IPXXB.
Internal separation can be ensured by partitions, or protec-
tive covers (barriers, made of metal or non-metal materi-
als), insulation of exposed conductive parts or the inte-
grated enclosure of devices, as implemented in the mould-
ed-plastic circuit-breaker, for example. The forms of internal
separation mentioned in IEC 61439-2 – form 1, 2a, 2b, 3a,
3b, 4a and 4b – are listed in Tab. 10/4.
10.4 Forms of internal separation
based on IEC 61439-2
IEC 61439-2 describes possibilities how to subdivide power
switchgear and controlgear assemblies. The following shall
be attained by a subdivision into separate functional units,
separate compartments or by enclosing conductive parts:
• Protection against contact with hazardous parts
(minimum IPXXB, where XX represents any code numbers
1 and 2 of the IP code)
• Protection against ingress of solid foreign bodies
(minimum IP2X, where X represents any 2
nd
code
number)
Tab. 10/4:
Internal separation of switchgear and controlgear assemblies in accordance with IEC 61439-2
Form
Explanations
Form
Explanations
Block diagram
1
No internal separation
1
No internal separation
2
Separation between busbars and functional units
2a
No separation between terminals
and busbars
2b
Separation between terminals and
busbars
3
Separation between busbars and all functional units
+
Mutual separation of all functional units
+
Separation between the terminals of conductors led to
the units from the outside and these functional units,
not however between the terminals of these functional
units
3a
No separation between terminals
and busbars
3b
Separation between terminals and
busbars
4
Separation between busbars and all functional units
+
Mutual separation of all functional units
+
Separation between the terminals of conductors led to
the units from the outside which are assigned to a
functional unit and those terminals of all the other
functional units and busbars
4a
Terminals in the same separation
that is used for the connected
functional unit
4b
Terminals not in the same
separation that is used for the
connected functional unit
Legend:
Enclosure
Internal
separation
Busbar
Functional unit
Terminal for conductors
led to the unit
from outside
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