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A differential switch upstream will also be triggered for a fault occurring
downstream of the UPS. In calculating reactivity of this switch, account
must be taken of the leakage current of the UPS (approx. 8 mA) plus that
of the load which come together on the UPS’s earth conductor.
The neutral arrangements are altered only if there is an isolating
transformer or when the UPS operates with a neutral that is disconnected
upstream.
In any case avoid connecting the output neutral with the input neutral
or to the earth as this could damage the UPS.
Reminder : The UPS needs a neutral connection to work properly.
Operation without Neutral may damage the unit.
For installation with change in system earthing arrangement or
galvanic isolation see below schematic
Fig.3-1 Change in SEA or Galvanic isolation
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