Installation guide
UPS 40-160 kVA, 400 V 50/60 Hz output
User’s and Installation Guide
1023294
Revision C
16
Figure 6. UPS(40-80,100-160kVA)powerandcommunicationterminallocations
4.2 UPS wiring procedure
The proper connection order is as follows:
1. Switch off the supply to the distribution point to which the UPS unit is to be connected.
2. For extra safety, also remove the fuses from the selected lines. Make absolutely sure with
measurement that there is no power.
3. A readily accessible disconnect device must be incorporated in all fixed input wiring. The
disconnect device shall have a contact separation of at least 3 mm.
The UPS has automatic backfeed isolation but for extra safety a warning label can be
added on all primary power isolators installed remote from the UPS area to warn electrical
maintenance personnel.
The warning label shall carry the following wording or equivalent:
“ISOLATE UPS BEFORE WORKING ON THIS CIRCUIT”.
4. Check that electrical connections to the installation site have been properly executed.
Also check fuse or circuit breaker ratings and cable dimensions against tables for
40-160 kVA systems.
5. The UPS should be connected in accordance with the wiring diagram. Be sure to ground
the system according to local and/or national electrical wiring standards.