Emerson FPC user manual System Grounding, Equipment Grounding

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Installation Instructions

Figure 10 Low voltage control junction box connections, typical

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Building

Interface

Relay

Factory-supplied low-voltage control cable

Figure 11 Main input junction box connections, typical

	A
	B
	C
Customer input	N
power connection	N
3-phase, 3-wire + GND
for units with transformer	G
3-phase, 4-wire + GND
for units without transformer

Factory-supplied input power cable assemby

NOTE: Parallel cables are used on units with higher-ampacity

Neutral busbar and wire furnished on units without transformer

1.3.3System Grounding

The performance and safety of any power conditioning system depend on proper grounding. Figure 12 shows the typical grounding arrangements for the Liebert FPC.

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.

! CAUTION

Using isolating bushings in a metal conduit run can be a safety hazard and is not recommended.

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Contents Liebert FPC Page Table of Contents Figures Important Safety Instructions Unpacking and Preliminary Inspection Unpacking and InstallationHandling Considerations Inch cabinet weight Front Footprint and Floor cable accessCutout Dimensions cooling airflow FrontLocation Considerations Unit PreparationLiebert FPC heat output See Notes 2 Front and rear access is required. See Notes 1Full Load Heat Output Unit kVA BTU/Hr kW Floor pedestal details Floor Pedestal InstallationLiebert FDC Distribution Mounting Additional Distribution Mounting & WiringPower and Control Wiring Input Power ConnectionsElectrical connection location for 23 584mm cabinet FPC15000 Rev FPC15002 Rev Suggested minimum input wire size data Main input circuit breaker interrupting rating Main input power junction box dimensions, typical Junction Box InstallationMain input junction box electrical connections 4 wire Low-voltage control junction box dimensions, typicalEquipment Grounding System GroundingOutput Voltage Signal Reference GridGrounding Electrode Conductor for FPCs With Transformer Minimum grounding electrode conductor size AWGSystemTypical Liebert FPC without transformer grounding Typical Liebert FPC With transformer grounding arrangementOutput Power Connections Liebert FPC Main Liebert FPC+24VDC Unit EPOLow Voltage Terminal Strip WiringFactory Optional Customer Alarm Inputs Summary Typical control wiring for units with monitoringStartup ChecklistsWarranty Internal InspectionTerminal block compression lug torque specifications Torque specifications, generalPanelboard main circuit breaker torque specifications Branch circuit breaker torque specificationsUnit Serial Number Unit Model Number Date InspectionStartup Monitoring System Check-Out Customer Alarms Manual Restart Startup ProceduresNormal System Shutdown Normal System Turn onFPC16000 Power Monitor PanelAlarm Present/Silence Basic Monitor Panel Units Without MonitoringOperating Instructions RS-232 Ascii port customer commands Ascii interface default parametersParameter Default Field # Data item Units Monitored parameters data definitionsRepair Inspection and CleaningInspection Schedule Page That Ne tIti Ti n