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26 Wiring Connections
5. The UPS System Output Neutral is connected to one common point and solidly grounded per
requirements of the National Electrical Code. The ground connection inside the UPS SCC
cabinet may be required by the power wiring configuration at your site.
6. For Battery Cabinets:
DC power cables (and ground) from Battery Cabinet to UPS Module, and between Battery
Cabinets. Observe polarity. DC power cables should be installed in matched pairs (positive
and negative).
7. For remote battery, install DC power cables (and ground) from battery to Module Battery
Disconnect, and then to UPS Module DC bus. Observe polarity.
8. Module Battery Disconnect control wiring to UPS Module, and between Battery Cabinets if
applicable.
9. Control wiring from System Control Cabinet (SCC) to UPS modules. Wiring must be run in
individual separate steel conduit.
10. Power and control connections required for the Maintenance Bypass.
11. Power connections from SCC to critical load bus. Observe phase rotation.
12. Control wiring to Remote Monitor Panel, if used. Selected alarm messages are also available
for customer use through a set of contacts on a separate terminal board. Wiring must be run
in individual separate steel conduit.
13. Emergency Power Off control wiring (to SCC) must be run in separate steel conduit.
14. Communications wiring (to SCC) for terminals, site monitoring or for modem must be run in
separate steel conduit.
15. Any additional special wiring required at your site.
CAUTION
UPS bypass and system output neutral must be connected to only
one common point in the UPS system. This neutral line must be
grounded at the source.
NOTE
DC power and battery circuit breaker control cables are provided with
some Liebert-brand Battery Cabinets. Power cables are sized for
interconnecting Battery Cabinets. Field-supplied cabling might be required
to connect Battery Cabinets to the UPS module, depending on cabinet
configuration and layout.
DANGER
DO NOT MAKE ANY CONNECTIONS BETWEEN BATTERY TIERS
IN THE BATTERY CABINET. THESE CONNECTIONS WILL BE
MADE BY THE LIEBERT CUSTOMER SERVICE
REPRESENTATIVE DURING START-UP.