UPS Connection Point
Minimum Distance ( mm)
Without Switch Single Switch Four Switches
Battery supply +/- 1743 1743 848/792
PE terminal 1835 1835 1348
Table 4.4 Minimum Distance Between UPS Connection Point and Floor (continued)
4.1.6 General information
The following points are for general guidance only. If there are relevant local regulations, then follow the local regulations.
1. The protective earth cables must be selected in accordance with the AC power failure level, cable length, and
protection type. The shortest connection route must be used for the grounding wire connection.
2. The parallel connection of small cables can be used to make easier installation for cables which are carrying large
current.
3. The battery cable size must be selected in accordance with the current value given in Table 4.1 on the previous
page and a maximum allowed voltage drop is 4 VDC.
4. Avoid creating the coils to reduce the generation of electromagnetic interference (EMI).
4.1.7 Power cable connecting terminal
The rectifier input, bypass input, output, and battery power cables are connected to the respective terminals as specified in
the Power cable connection steps on page37.
4.1.8 Protective ground
The protective earth cable is securely connected to the PE input terminal through the fixing bolt (See Power cable connection
steps on page37). All the cabinets and cable conduits must be grounded according to the local regulations. The grounding
wires must be securely fastened to prevent the loosening of the grounding wire tightening screws when the grounding wires
are pulled.
WARNING! Failure to ground as required may cause EMI, electric shock, or fire risk.
4.1.9 External protective devices
For safety concerns, it is necessary to install the external circuit breakers or other protective devices for the input and battery
of the UPS system. This section provides generic practical information for the qualified installation engineers due to the
different specific installations. The qualified installation engineers should be knowledgeable about local regulatory wiring
standards on the equipment to be installed.
Rectifier and bypass input supply of the UPS:
1. Input overcurrent and short circuit protection
4 Electrical Installation Proprietary and Confidential ©2023 Vertiv Group Corp. 35
Vertiv™ Liebert® APM2 30 to 120 kVA Modular UPS User Manual
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