External battery
The battery switch box (mandatory) must be installed for protecting the external battery. The UPS consist of an optional
battery switch box cabinet to provide overcurrent protection, short circuit protection and automatic tripping functions for the
external battery.
This battery switch box is important for the battery maintenance and is generally installed near the battery.
System output
The UPS output distribution must be configured with a protective device. The protective device must be different from the
input distribution protection switch and able to provide overload protection (see Table 12.6 on page173 and Table 12.7 on
page174).
NOTE: An IT grid system, 4-pole protective components must be installed for the UPS external input power
distribution.
4.1.10 Power cable connection steps
Connection terminal
Figure 4.2 on the next page shows the connection terminals of the UPS power cable. Figure 4.3 on page39 shows the power
cable entry and routing methods, refer to the cabling method to route cables and then connect them to corresponding
terminals shown in Figure 4.3 on page39.
NOTE: The power cables should be routed through tunnels or cable conduits to prevent cable damage due to
mechanical stress. After that reduce the electromagnetic interference to the surrounding environment.
NOTE: It is necessary to tie and fix the cables when routing the cables inside the cabinets to prevent cable damage
because of mechanical stress.
4 Electrical Installation Proprietary and Confidential ©2023 Vertiv Group Corp. 37
Vertiv™ Liebert® APM2 30 to 120 kVA Modular UPS User Manual
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