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Installation Instructions
14
1.3.2 Junction Box Installation
Main input (power) and low-voltage (control) junction boxes are available for the Liebert FPC to sim-
plify customer connections.
The junction boxes, if used, can either be shipped with the system or can be advance-shipped for
installation during the roughing-in stage of new construction.
Liebert supplies flexible, 10-foot-long (3m) conduit with cables for connecting the junction boxes to the
unit. The junction boxes should be installed a maximum of 8 ft. (2.4m) from the feeder entrance of the
unit.
Liebert recommends centering the junction boxes under a floor tile that is easily removed.
Junction box connections must be installed in compliance with the NEC and all other applicable
codes.
Typical junction box connections are shown in Figure 16 and described in 1.3 - Power and Control
Wiring.
Dimensions are given on the drawings furnished with the unit. Typical dimensions of the junction
boxes are as follows:
!
WARNING
Verify that incoming line voltage (power) and low-voltage (control) circuits are de-energized
and locked out before installing cables or making any connections in the junction box.
Table 6 Main input junction box electrical connections (4 wire)
Junction Box Size
Inches (mm) Electrical Connections
27 x 14 x 6
(686 x 356 x 152)
400A 3 pole power block with 1/2 -13 studs on 1-3/4" (44mm) centers
750A ground busbar with two sets of 3/8 - 16 studs on 1.75” centers
35 x 22 x 6
(889 x 559 x 152)
750A phase busbars with 1/2 -13 studs on 1-3/4" (44mm) centers
750A ground busbar with two sets of 3/8 -16 studs on 1-3/4" (44mm) centers
Table 7 Main input junction box without transformer electrical connections (5 wire)
Junction Box Size
Inches (mm) Electrical Connections
27 x 14 x 6
(686 x 356 x 152)
400A 3 pole power block with 1/2 -13 studs on 1-3/4" (44mm) centers
750A neutral busbar with two sets of 1/2 -13 studs on 1-3/4" (44mm) centers
750A ground busbar with two sets of 3/8–16 studs on 1-3/4" (44mm) centers
35 x 22 x 6
(889 x 559 x 152)
750A phase busbars with 1/2 -13 studs on 1.75” centers
1500A neutral busbar with two sets of 1/2 -13 studs on 1-3/4" (44mm) centers
750A ground busbar with two sets of 3/8 - 16 studs on 1-3/4" (44mm) centers
Table 8 Low-voltage (control) junction box dimensions, typical
Width, inches (mm)
8 (203)
Length, inches (mm)
10 (254)
Height, inches (mm)
4 (102)
Table 9 Main input (power) junction box dimensions, typical
Unit kVa
Input Voltage
208-240V 380-415V 480-600V
15-100 kVA, L x W x H, inches (mm) 27 x 14 x 6 (686 x 356 x (152)
125-150 kVA, L x W x H, inches (mm)
35 x 22 x 6
(889 x 559 x 152)
27 x 14 x 6 (686 x 356 x (152)
200 kVA, L x W x H, inches (mm)
N/A
27 x 14 x 6 (686 x 356 x (152)
225 kVA, L x W x H, inches (mm)
N/A
35 x 22 x 6
(889 x 559 x 152)
27 x 14 x 6
(686 x 356 x (152)
300 kVA, L x W x H, inches (mm)
N/A
35 x 22 x 6 (889 x 559 x 152)