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Appendix A.1.2 DC Power Connections
The DC power connections to the Liebert FS are made through the circuit breaker (see Figure 96) in
the UPS interconnection kit installed in your Liebert FS. The maximum wire size for the circuit
breaker terminals is 350MCM - 600VDC (approximate metric equivalent: 150mm
2
wire section). Wire
size and installation must comply with all applicable local, regional and national regulations (e.g.,
National Electric Code for USA).
Figure 96 Circuit breaker
The Liebert FS cabinet is configured for top entry cables in standard configuration. The cables can
also be run through the side panels. The Liebert FS cabinet does not accommodate bottom entry
cables.
The connection of the circuit breaker is described in Figure 135 - Elevation drawing—Liebert FS
cabinet with integrated circuit breaker. Refer to this drawing to ensure that the adequate con-
nections are performed.
Circuit Breaker Torque
Tighten the positive and negative terminals of the DC power connections on the circuit breaker to
250 in-lb. (29 N-m) unless the equipment is labeled with a different torque value.
Liebert FS
Negative
Terminal
Liebert FS
Positive
Terminal