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P A N E L D E S I G N A N D E Q U I P M E N T
3.3.4 Cable connection compartment
Depending on individual operating requirements,
the cable compartment can house up to three
current transformers, fixed and withdrawable
voltage transformers, and an earthing switch.
Should all three current transformers not be
required, dummies are installed in their place using
the same installation and connection procedures.
The fix-mounted voltage transformers are
connected on the primary side with flexible,
full-insulated cables that are inserted into the
transformers.
The removable voltage transformers are fitted
with HRC fuses.
The ET1 earthing switch can be used with a
manual mechanism. Its switching position is
indicated mechanically by an indication on the
shaft and electrically by means of the auxiliary
switch.
The surge arrestors can be fix-mounted in the
cable compartment.
Cable connection of units:
•
As a standard solution, it is possible to
connect up to three parallel plastic cables with
single-core protection per phase.
In a 1,250 A panel, the cable push-on sealing ends
require a maximum cross section of 300 mm
•
Customer requests regarding connections to
bars, three-core cables, special cables or sealing
ends of different types must be considered
during the order-planning stage
—
Figure 7 Low-voltage compartment, internal view
For more information regarding cable connections,
please refer to chapter 5.10.
3.3.5 Control cabinet
The control cabinet, which covers all control and
protection aspects, can accommodate both
conventional or microprocessor control technology.
If the secondary devices are not intended for door
installation they are mounted on DIN RAILS.
These rails enable any subsequent changes to the
wiring. Three rows of DIN RAILS on a swiveling
DIN RAIL holder are located at the lower part of
the control cabinet, and directly under these is an
easily accessible auxiliary switch for the control
wiring plug.
The secondary wiring inside the panel is housed
in a duct on the right side of the panel. The
left-hand side of the panel is for the external
wiring. The ducts are covered with a steel metal
sheet. Holes at the side of the control cabinet
enable the ring conductors to be slid in.
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