Additional Distribution Mounting & Wiring; Liebert Fdc Distribution Mounting; Distribution Cabinet Electrical Connections; Power And Control Wiring - Emerson Liebert FPC User Manual

1.2 Additional Distribution Mounting & Wiring
For Liebert FPCs with more than four panelboards, the additional panelboards are furnished in Lie-
bert FDC enclosures, which are shipped separately from the Liebert FPC.
1.2.1

Liebert FDC Distribution Mounting

The Liebert FDC distribution cabinet has the same base dimensions as a 23" (584mm) cabinet FPC
(23-1/2" wide x 38" deep [597 x 965mm]) and may be mounted on either the left or right side of the FPC.
1. Provide a floor cutout for exit of output cables, as shown in Figure 1.
2. Remove the side panel, internal panel and the lower panel bracket from the FPC.
3. Remove the FDC side panel and internal panel, if supplied, and align the FDC with the FPC and
bolt the units' frames together (hardware provided by others).
If floor pedestals are used for the FPC, two additional floor pedestals are required for the outside
corners of the FDC. See Figure 1.
4. Install the lower panel bracket on the opposite side of the FDC cabinet.
5. Make electrical connections. For details, see "Electrical Field Connections" drawings supplied
with the unit.
6. Install the FPC side panel on the FDC cabinet.
1.2.2

Distribution Cabinet Electrical Connections

Five field-supplied conductors (3-phase conductors, neutral and ground) are needed to connect the
FDC cabinet to the FPC cabinet in the field.
For Liebert FPCs with transformers, the distribution cabinet phase conductors are connected directly
to the transformer terminals:
Phase A to X1
Phase B to X2
Phase C to X3
The FDC's neutral and ground conductors are connected to the FPC's neutral busbar and main
ground busbar (see unit wiring diagram for location).
For Liebert FPCs without transformers, the distribution cabinet phase and neutral conductors are
connected to the corresponding output power distribution terminal blocks inside the FPC. The distri-
bution cabinet ground conductor is connected to the main ground busbar.
For all Liebert FPCs with current monitoring, route each distribution cabinet conductor through the
appropriate current transformer (CT) in the FPC.
NOTE
Distribution cabinet conductors must pass through the current transformers in the same
direction as the FPC panelboard conductors. Use the existing FPC panelboard wiring for
reference.
1.3

Power and Control Wiring

Power and control wiring should be installed by licensed electricians. All power and control wiring
must comply with the NEC and applicable local codes.
1.3.1

Input Power Connections

If the FPC is furnished with a main input junction box, input power connections are made as detailed
in 1.3.2 - Junction Box Installation.
If a junction box is not furnished, the input power feeder is connected to the main input circuit
breaker located inside the FPC. (See Figures 5 through 8.)
WARNING
!
Verify that all incoming line voltage (power) and low-voltage (control) circuits are
de-energized and locked out before installing cables or making connections, whether in the
junction box or in the FPC.
8
Installation Instructions