Forms Of Internal Separation Based On Iec 61439-2; Iec 61439-2 - Siemens Sivacon S8 Planning Information

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
number)
Tab. 10/4: Internal separation of switchgear and controlgear assemblies in accordance with IEC 61439-2
Form Explanations
1 No internal separation
Separation between busbars and functional units
2
Separation between busbars and all functional units
+
Mutual separation of all functional units
+
3
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
Separation between busbars and all functional units
+
Mutual separation of all functional units
+
4
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
Legend:
98 SIVACON S8 Planning Principles – Technical annex
nd
code
Form
1
2a
2b
3a
3b
4a
4b
Enclosure
Internal
separation
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.
Explanations
No internal separation
No separation between terminals
and busbars
Separation between terminals and
busbars
No separation between terminals
and busbars
Separation between terminals and
busbars
Terminals in the same separation
that is used for the connected
functional unit
Terminals not in the same
separation that is used for the
connected functional unit
Busbar
Functional unit
Terminal for conductors
led to the unit
from outside
Block diagram