Vertiv | Liebert
®
PPC
™
User Manual | Rev. 6 | 03/18 | 20
1.3.2 Junction Box Installation (If Used)
Main input (power) and low-voltage (control) junction boxes are available for the Liebert PPC to simplify
customer connections.
Shipping Arrangements—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.
Installation Location—Liebert supplies flexible, 10-foot-long (3 m) 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.
Vertiv recommends centering the junction boxes under an easily removable floor tile.
Junction Box Connections must be installed in compliance with the NEC and all other applicable codes.
Typical junction box connections are shown in Figure 13 and described in 1.3 - Power and Control Wiring.
Dimensions—Dimensions are given on the drawings furnished with the unit. Typical box dimensions are:
WARNING
Risk of electric shock. Can cause injury or death.
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 4 Main input junction box with transformer electrical connections
Junction Box Size, In. (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 1-3/4" (44mm) 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 5 Main input junction box without transformer electrical connections (5 wire)
Junction Box Size, In. (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 6 Main input (power) junction box dimensions, typical
Unit Rating, kVA
Input Voltage
208-240V 380-415V 480-600V
Dimensions, L x W x H, inches (mm)
15-100 27 x 14 x 6 (686 x 356 x (152)
125-150 35 x 22 x 6 (889 x 559 x 152) 27 x 14 x 6 (686 x 356 x (152)
200 kVA N/A 27 x 14 x 6 (686 x 356 x (152)
225 kVA N/A 35 x 22 x 6 (889 x 559 x 152) 27 x 14 x 6 (686 x 356 x (152)
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