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4.2.4 External maintenance by-pass.
In some cases, in order to facilitate maintenance operations of the individual units making up the system, it may be
advisable to install an external maintenance by-pass.
The new disconnector located on the by-pass line (Q2) must be provided with auxiliary contacts (one for each UPS).
The position of the contact is opposite to the position of the switch, thus the contact must be closed when the
disconnector is open.
The contacts of each disconnector must be connected to the corresponding UPS terminals, as shown in the diagram.
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B
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