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Configuring Your Neutral and Ground Connections
18
6.6 Preferred Grounding Configuration, Battery Systems
Open-rack battery systems, depending on local code requirements and customer preference, are
normally:
1. Floating (ungrounded),
2. Center-tapped and floating or
3. Center tapped and grounded.
Battery cabinet systems must be connected as floating (ungrounded) systems—Option 1 above.
Center-tapped or grounded battery systems are not possible with battery cabinet systems.
Whether the battery system is open-rack or cabinet, the metal rack parts or cabinet must be grounded
to the UPS module ground bus.
Figure 7 illustrates how a simple, one-cabinet system would be grounded. For systems with multiple
cabinets, the same configuration would apply. However, for simplicity, the installer can connect all
the battery cabinet grounds for a particular module together and run a single ground conductor to
that UPS module ground (in the same conduit as the phase conductors).
Figure 7 Preferred battery cabinet grounding configuration
GROUNDING
ELECTRODE
PER NEC 250-24
TO OUTPUT
DISTRIBUTIO
N