Eaton 93PM UPS 480V Three-Wire – 100 kW Frame Installation and Operation Manual 164000227—Rev 07 25
• To allow for future power upgrades, Eaton recommends installing the UPS using wiring and external
overcurrent protection breakers sized for the fully rated UPS kW frame size installed instead of the derated
kW ordered. Wiring for the maximum kW frame size will allow a full power rating upgrade without having
to modify the site wiring infrastructure.
• For external wiring, use 75°C copper wire.
IMPORTANT
This product has been evaluated for use with copper wire only.
Wire sizes listed in Table 4 and Table 5 are for copper wiring only. If wire is run in an ambient temperature
greater than 40°C, larger size wire may be necessary. Wire sizes are based on using the specified
breakers.
• The AC output and output ground wiring to the critical load should be sized the same as the UPS rectifier,
bypass, and rectifier and bypass ground wiring if the recommended output breaker listed in Table 10 is not
installed in the system.
• Recommended wire sizes are based on NFPA National Electrical Code
®
(NEC
®
) 70 Table 310.15(B)(16)
75°C ampacity with 40°C ambient correction factors.
• Connect to a 3 wire, grounded Wye source or in single source applications, a 3-wire High Resistance
Ground (HRG) source. A neutral conductor is not used from the source or supplied to the load.
• Supported single source, single or dual feed power sources:
– 3-wire grounded Wye (TN,TT)
– 3-wire High Resistance Ground (IT)
• Supported dual source, dual feed power sources:
– 3-wire grounded Wye (TN, TT)
CAUTION
SINGLE HIGH IMPEDANCE GROUND SOURCE – In North American installations, the neutral conductor from
the high impedance ground source of supply CANNOT be used.
• Phase rotation must be clockwise starting with phase A (rotation A, B, C).
• If installing an external maintenance bypass, all feeds to the UPS including the Rectifier Input Breaker (RIB)
(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.
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Read and understand the following notes in addition to the notes in paragraph
3.2.2 UPS System Power Wiring Preparation while planning and performing the external parallel installation:
• All external parallel UPS rectifier inputs must come from one source and all bypass input feeds must come
from one source.
• All UPSs in the external parallel system must contain the same number of UPMs. Mixed UPS kVA ratings
are not permitted.
• External parallel UPS input wiring size recommendations and output wiring size recommendations from
the UPSs to the tie cabinet are the same as listed in Table 4, or Table 5.
UPS Installation Plan and Unpacking
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