4 Electrical Installation
This chapter describes the electrical installation of the Vertiv™ Liebert® APM2 UPS.
After completing the mechanical installation of the UPS, it is necessary to connect the power cable and signal cable of the
UPS.
All the signal cables, whether shielded or not, should be kept away and routed separately from the power cables.
WARNING! Risk of electric shock and hazardous voltage. Can cause equipment, personnel injury, or death. Do
not turn on power to the UPS before the arrival of authorized service engineer. Only an authorized engineer
can route the APM2 UPS cables in accordance with the information given in this chapter.
4.1 Wiring of Power Cable
4.1.1 System configuration
The power cables of the system must be sized with respect to the following description:
UPS input cables
The UPS input cables must be sized for the maximum input current, including the maximum battery charge current, see Table
4.1 on the next page, with respect to the UPS power ratings and the input AC voltages.
UPS bypass and output cables
The UPS bypass and output cables must be sized for the nominal output or bypass current, see Table 4.1 on the next page,
with respect to the UPS power ratings and the output AC voltages.
Battery cables
Each UPS connects to its battery through the three cables connecting to the positive pole, negative pole and ground cable.
The cable size of the battery cable differs with the UPS power ratings, provided that it meets the battery discharge current
requirement when the battery discharges to near EOD voltage, as shown in Table 4.1 on the next page.
4.1.2 Maximum steady state AC and DC currents
The power cables must be selected in accordance with current and voltage values as given in Table 4.1 on the next page as
well as local wiring regulations and environmental conditions (temperature and physical media). Refer Table 3B in IEC 60950-
1 for more information on size of the cables.
4 Electrical Installation Proprietary and Confidential ©2023 Vertiv Group Corp. 33
Vertiv™ Liebert® APM2 30 to 120 kVA Modular UPS User Manual
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