Before you begin installation, the input source must be isolated and secured to prevent reconnection
during installation. The input circuit breaker on the rear of the UPS must be in the Off position.
Installation may be carried out only by qualified technicians, conforming to applicable safety
Electric shock hazard: Even when the unit is disconnected from the mains, hazardous voltage
may still be supplied by the battery. Both poles should be disconnected before carrying out
maintenance work inside the UPS.
For electrical installation, the nominal current rating of the source must be observed. The UPS is not
suitable for connection to 16A subdistribution systems.
Current Table and Suggested Cable Sizes
The following table indicates the currents and recommended sizes of the connecting cables in accor-
dance with regulations IEC-287 and DIN VDE 0298
1. PVC-insulated copper cables (@ 70°C) (158°F).
2. Air temperature surrounding the conduits should not be greater than 30°C (86°F).
Should there be any variation in the conditions, it will be necessary to verify whether the cable
dimensions satisfy the requirements of IEC-287 and DIN VDE 0298. In cases where the cables
are so long that they cause a drop in voltage of >3%, a larger size must be used.
Max input current
Input cable size
Max output current
Output cable size
Earth cable size
When the UPS is in Bypass mode, the entire output current of the UPS is passed through the phase
L1 and Neutral cables. To simplify connection data, no distinction has been made between phase L1
and phases L2 and L3. The cable sizes are defined for the maximum current carried by the output
Particularly sensitive equipment may be susceptible to interference. To prevent this, Liebert
Mains input, output and external battery cables to the UPS in earthed, metal conduits, or
Use shielded cables
Routing of cables (e.g. power supplies, communication or data lines) to other equipment,
should be kept separate from that of UPS cables.
UPS Power Rating
10 - 1/1
10 - 3/1