User manual
Table Of Contents
- Important Safety Instructions
- 1.0 Installation Instructions
- 1.1 Unpacking and Installation
- 1.2 Additional Distribution Mounting and Wiring
- 1.3 Power and Control Wiring
- 1.3.1 Input Power Connections
- Figure 5 Electrical connection location for 23" (584mm) cabinet
- Figure 6 Electrical connection location for 47" (1194mm) cabinet
- Figure 7 Electrical connection location for 47" cabinet with Square D I-Line panelboard
- Table 4 Suggested minimum input wire size data
- Table 5 Main input circuit breaker interrupting rating
- 1.3.2 Junction Box Installation
- Table 6 Main input junction box electrical connections (4 wire)
- Table 7 Main input junction box without transformer electrical connections (5 wire)
- Table 8 Low-voltage (control) junction box dimensions, typical
- Table 9 Main input (power) junction box dimensions, typical
- Figure 8 Low-voltage control junction box connections, typical
- Figure 9 Main input junction box connections, typical
- 1.3.3 System Grounding
- 1.3.4 Grounding Electrode Conductor for Liebert® FPCs With Transformer
- 1.3.5 Output Power Connections
- 1.3.6 Control Wiring Connections
- 1.3.7 Adapter Board
- 1.3.1 Input Power Connections
- 2.0 Equipment Inspection and Startup
- 3.0 Inspection and Startup Checklist
- 4.0 Operating Instructions
- 5.0 Maintenance
Installation Instructions
16
Equipment Grounding
Equipment grounding is primarily for safety. Correct implementation of grounding also enhances
equipment performance. All power feeders must include equipment grounding means as required by
the NEC and local codes.
An insulated ground conductor is recommended to be run in each feeder conduit. Ground conductors
must be at least the minimum size per NEC Table 250-66. Larger wire sizes may be used for
increased system performance.
If the input power feeder conduit is used as a grounding conductor, adequate electrical continuity
must be maintained at all conduit connections.
Signal Reference Grid
If the unit is used to supply power to a computer room or area that is equipped with a signal reference
grid or a grounded raised-floor stringer system, a grounding conductor should be connected from the
system ground bus to the grid or floor system. This conductor should be stranded or braided #8 AWG
or larger, and as short as practical. Less than 3 ft. (1m) is recommended.
1.3.4 Grounding Electrode Conductor for Liebert
®
FPCs With Transformer
Required by code - The Liebert FPC
™
with transformer must be grounded according to the safety
practices of NEC 250-26. A local grounding electrode conductor is recommended in addition to the
equipment safety ground which is normally run with the input power conductors. (See Figures 5
through 7.)
As shown in Figure 10, the grounding electrode conductor is run from the unit to the nearest
effectively grounded location (listed in order of preference):
• Building steel
• Metal water pipe
• Other made grounding electrode
The grounding electrode conductor’s size is based on the secondary circuit conductors. Table 10
shows the minimum recommended grounding electrode conductor according to the NEC
(Table 250-66).
WARNING
Risk of electric shock. Can cause equipment damage, improper operation, injury and death.
Isolating bushings must not be used in a metal conduit run. These busings might prevent the
system from being properly grounded.
Table 10 Minimum grounding electrode conductor size (AWG)
kVA
Output Voltage
208V 380V 415V
15 8 8 8
30 8 8 8
50 4 8 8
75 2 6 6
100 0 4 4
125 0 2 2
150 00 2 2
200 00 0 0
225 00 0 0
300 00 0 0
AWG wire size based on 75°C copper conductors