Emerson 610 installation manual Preferred Grounding Configuration, Battery Systems

Configuring Your Neutral and Ground Connections

6.6Preferred 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 10 illustrates how a simple, one-cabinet system would be grounded. For systems with multi- ple 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 10 Preferred grounding configuration, battery systems

20