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2.3.5.3 Dismantling of plug-in
voltage transformers
Isolate the relevant section of the system before dis-
mantling plug-in voltage transformers.
− Comply with the safety regulations to EN 50110.
− Check the switchgear section for the off-circuit condition in
accordance with section 5.1.
− Earth the switchgear section and secure the working area
in accordance with section 4 and EN 50110 standard.
− Switch the mcbs
of the relevant operating mechanisms
1)
off so that the system section cannot be energized by
remote control.
− Start dismantling with one of the outer transformers.
− Release the four fastening screws (1 in figure 2.3.5.1) of
the transformer.
− Draw the transformer vertically (without tilting it) out of the
socket.
− Lay the transformer down, for example on the roof of the
low voltage compartment.
− Cover the silicone part of the transformer to protect it from
soiling.
− Close off the voltage transformer socket in the panel with
an insulating blanking plug (section 2.4.3).
− Dismantle the secondary wiring of the transformer.
− Remove the transformer from the roof of the low voltage
compartment.
− Dismantle the other voltage transformers in the manner
described.
mcb: miniature circuit-breaker
1)
2.4
Connection of cables
and wiring
2.4.1
Control cables and wiring
− Establish the panel to panel connections of the control wir-
ing. The panel to panel connections are of the plug-in type.
− The secondary cable entry for external control cables and
wiring is located in the roof plate. Lead external control ca-
bles and wiring through the roof or floor plate using reducer
rings, and connect these in accordance with the wiring
diagram.
Earth the cable screen for the external control cables in accord-
ance with the accepted EMC (electromagnetic compatibility) rules.
?
External control cables should be screened.
?
The lengths of the external control cables should
not exceed 200 m. With greater lengths, use for
example interposing relays or optical fibre cables.
Manual ZX0 HB 600 en - Revision 05 | 33
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