Liebert Trinergy™ Cube Electrical INSTALLATION
Page 104 Installation Manual - 10H52243IM60 - rev. 7 - 06/2020
Figure 108 - CUSTOMER POWER CONNECTIONS I/O BOX 4000-5000A - FRONT VIEW -
FLANGES CONNECTIONS QUOTATIONS (see “NOTE” on page 133)
4.8. Configuring Ground Connections
Improper grounding is the largest single cause of UPS installation and start-up problems. Grounding
techniques vary significantly from site to site, depending on several factors.
Proper grounding should be based on the appropriate IEC 60364 sections and/or local wiring rules, but
safe and proper equipment operation requires further enhancements.
Warning
The UPS ground lug must be solidly connected to the service entrance ground by an appropriately
sized wire conductor per the IEC 60364-5-54. Each conduit or raceway containing phase conductors
must also contain a ground wire, both for UPS input and output, which are solidly connected to the
Warning
In addition to safety requirements it is important to follow grounding best practices for EMC
requirements. For example, daisy chain grounding connection between UPS modules located in
different electrical rooms or floors is not recommended.
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