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Installation
7
1.6.1 Clearances
There are no ventilation grilles on the sides or rear of the UPS. The unit may be placed with the rear
against a wall and optional cabinets on either side.
To enable routine tightening of power terminations within the UPS, make sure there is sufficient
clearance in front of the Liebert NX to permit free passage of personnel with the door fully opened.
Leave a minimum of 8 in. (203mm) between the top of the UPS and the ceiling to permit adequate air
circulation above the unit. Liebert recommends against using air conditioning or other systems that
blow air onto the top of the unit.
1.6.2 Floor Installation
The diagrams in 6.0 - Installation Drawings show the location of holes in the base plate for bolting
the equipment to the floor.
If the equipment is to be placed on a raised floor, it should be mounted on a pedestal that will support
the equipment point loading. Refer to the bottom view in Figure 21 to design this pedestal.
1.6.3 Cable Entry
Cables can enter the Liebert NX from the top or bottom. Cable entry is made possible by removing a
metal plate attached to the UPS.
These plates are designed to allow the personnel to punch holes for fitting and securing the conduit.
Once the conduit holes are punched, these plates should be reattached to the UPS.
System Composition
A UPS system can comprise a number of equipment cabinets, depending on the individual system
design requirements—e.g., UPS cabinet with External Bypass cabinet and Maintenance Bypass cabi-
net. In general, all cabinets used will be the same height and are designed to be positioned side-by-
side to form an aesthetically appealing equipment suite.
1.6.4 Optional Cabinets
The Maintenance Bypass Cabinet must be cabled and bolted to the Liebert NX before the UPS and
bypass cabinet are moved into their final position. Connect the input wiring to the Maintenance
Bypass Cabinet ONLY after the units are connected and positioned.
Battery cabinets may be bolted to either side of the Liebert NX; see Figure 1.
!
CAUTION
To reduce the risk of fire, connect only to a circuit provided with correct amperes maximum
branch circuit overcurrent protection (see Table 8) in accordance with the National Electric
Code, ANSI/NFPA 70.
NOTE
When installing the UPS, the customer must provide a disconnect with overcurrent protection
at the output of the UPS.