Ups System Power Wiring Preparation - Eaton 93PM Installation And Operation Manual

UPS Installation Plan and Unpacking
3.2.2

UPS System Power Wiring Preparation

Read and understand the following notes while planning and performing the installation:
As a result of the connected loads high leakage current is possible. Connection to earth ground is
required for safety and proper product operation. Do not check UPS operation by any action that
includes removal of the earth (ground) connection with loads attached.
Refer to national and local electrical codes for acceptable external wiring practices.
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To allow for future kVA upgrades, consider installing a derated UPS using wiring and external overcurrent
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protection breakers sized for a fully rated UPS.
For external wiring, use 90°C copper wire. Wire sizes listed in Table 3-4 are for copper wiring only. If wire is
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run in an ambient temperature greater than 40°C, higher temperature wire and/or larger size wire may be
necessary. Wire sizes are based on using the specified breakers.
Wire ampacities are chosen from Table 310-16 of the National Electrical Code
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copper wire with a 90°C rating.
Connect to a 3 wire, grounded wye source. A neutral conductor is not used from the source or supplied to
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the load.
Supported single source, single or dual feed power sources
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- 3-wire grounded wye (TN,TT)
Supported dual source, dual feed power sources
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- 3-wire grounded wye (TN, TT)
Material and labor for external wiring requirements are to be supplied by designated personnel.
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The bypass feed into this equipment uses three wires. The rectifier feed into this equipment uses three
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wires. The phases must be symmetrical about ground (from a wye source) for proper equipment operation
If installing an external maintenance bypass, all feeds to the UPS including the Rectifier Input Breaker (RIB)
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(if installed) must have a service disconnect independent of the maintenance bypass power path. Most
maintenance bypass solutions provide UPS input feeds derived from but isolated from the maintenance
bypass power path. If the maintenance bypass solution being installed does not provide such functionality,
DO NOT use a single feeder breaker to supply both the UPS and the maintenance bypass.
3-10 Eaton 93PM UPS (60–100 kW, 480V) Installation and Operation Manual P-164000227—Rev 2
WARNING
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