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Wiring Considerations 19
8.1 Power and Control Wiring
1. Power wiring must be run in individual, separate conduit or cable tray. Control wiring must
be stranded and run in individual separate steel conduit.
2. Observe local, state and national electrical codes. Verify utility power and its overcurrent
protection rating will accommodate the UPS input rating, including battery recharging.
3. A safety ground wire must be run from building ground to ground point in the UPS Module
Cabinet and Battery Cabinet. The grounding conductor shall comply with the following
conditions of installation:
a. An insulated grounding conductor that is green with or without one or more yellow stripes
is to be installed as part of the branch circuit that supplies the unit or system. The
grounding conductor should be sized in accordance with NEC and local codes.
b. The grounding conductor described above is to be grounded to earth at the service
equipment or, if supplied by a separately derived system, at the supply transformer or
motor-generator set.
c. The attachment-plug receptacles in the vicinity of the unit or system are all to be of a
grounding type, and the grounding conductors serving these receptacles are to be
connected to earth ground at the service equipment.
4. When possible, input to the UPS and bypass should be four wire plus ground. When input is
straight delta, the UPS artificial neutral kit should be ordered. When input is corner-
grounded delta, the isolated neutral kit should be ordered.
5. Observe clockwise phase rotation of all power wiring. Phase A leads Phase B leads Phase C. A
qualified electrician should check the phase rotation.
6. NEC Class 1 wiring methods are required for control and communication Class 2 circuits.
8.2 Battery Wiring
Power wiring to the Battery Cabinet connects positive, negative, and ground power cables from
the Battery Cabinet to the associated UPS. Connection of the UPS to the Battery Cabinet serves
to both charge and discharge the batteries (when needed). The battery disconnect (circuit breaker)
requires a control cable. Power and control cables are field supplied. Refer to Figure 11 through
Figure 13.
Call Liebert Global Services to schedule installation check-out, final battery intercell connections,
and start-up.
!
CAUTION
Power and control wiring must be separated!
!
WARNING
A BATTERY INTERCELL CONNECTION ON EACH TIER IS
DISCONNECTED FOR SAFETY DURING SHIPMENT. DO NOT
COMPLETE THESE CONNECTIONS. THE LIEBERT CUSTOMER
SERVICE REPRESENTATIVE WILL COMPLETE THESE
CONNECTIONS AS PART OF START-UP. AN IMPROPERLY
INSTALLED UNIT CAN RESULT IN INJURY TO PERSONNEL OR
DAMAGE TO EQUIPMENT.
!
CAUTION
Be sure polarity is correct when wiring the Battery Cabinet to the
connected equipment (positive to positive; negative to negative).
If polarity is not correct, fuse failures or equipment damage can
result.
NOTE
Inspection of the battery installation is a service that can be provided by
Liebert. A Battery Specialist can perform a detailed inspection of the entire
battery system to ensure it meets current IEEE standards. This inspection
service is recommended because batteries are a very critical part of the UPS
system.