LEGRAND KEOR S 3KVA 1 Operating & Installation Manual page 20

5.3.1.2. Input Connection
Please add double-pole miniature circuit breaker (equivalent UPS input breaker) to distribution board
where UPS is to be connected. Do not connect any other load to this circuit breaker and please do not
forget to add leakage current relay.
Connect the phase cable to input "L" terminal, the neutral to input "N" terminal.
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The installation and adjustment of distribution panel should be done by The installation and adjustment of distribution panel should be done by
specialized technician. specialized technician.
According to EN 62040-1, the user should place a warning label on the input distribution panel
and the other primary power isolators, in order to prevent the risk of voltage backfeed.
This label is sent with the Installation Manual. It indicates:
RISK OF VOLTAGE BACKFEED
• Isolate Uninterruptable Power Supply before working on this circuit.
• Then check for Hazardous Voltage between all terminals including the protective earth (PE).