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Electrical Connections
13
2.1.4 Cable Connections
The rectifier input, bypass and output are easily accessible from the front of the unit for installation.
All require lug type terminations. They are connected to busbars on the front side of the Liebert NX
and below the circuit breaker, as shown in Figure 4. These busbars are accessible when the front
side panel is removed. Busbars to connect external batteries are accessible from the front of the UPS.
Figure 4 Input and output busbars
NOTE
External connection access requires removal of a protective panel on the lower front of the UPS.
NOTE
There is no battery fuse in the UPS; the battery cabinet must include a circuit breaker
to cut off the current in case of short circuit. Refer to Table 8 for current ratings.
Rectifier Input
Busbars
(Phases are
indicated by
letters below the
bars)
Output Busbars
(Phases are
indicated by
letters below the
bars)
Battery Input
Connections
Bypass Input Busbars
(Phases are indicated by
letters below the bars)
Ground
Busbar
Rectifier Input
Busbars
(Phases are
indicated by
letters below the
bars)
Output Busbars
(Phases are
indicated by
letters below the
bars)
Battery Input
Connections
Bypass Input Busbars
(Phases are indicated by
letters below the bars)
Ground
Busbar
Liebert NX 40-120kVA Connections
Liebert NX 160-200kVA Connections