UPS Installation Plan and Unpacking3-14 Eaton 93PM UPS (20–100 kW, 480V – 100 kW Frame) Installation and Operation Manual P-164000227—Rev 6 www.eaton.com/powerquality3.2.2 UPS System Power Wiring PreparationRead and understand the following notes while planning and performing the installation:WARNINGAs a result of the connected loads high leakage current is possible. Connection to earth ground isrequired for safety and proper product operation. Do not check UPS operation by any action thatincludes removal of the earth (ground) connection with loads attached.l Refer to national and local electrical codes for acceptable external wiring practices.l To allow for future power upgrades, Eaton recommends installing the UPS using wiring and externalovercurrent protection breakers sized for the fully rated UPS kW frame size installed instead of the deratedkW ordered. Wiring for the maximum kW frame size will allow a full power rating upgrade without having tomodify the site wiring infrastructure.l For external wiring, use 75°C copper wire. Wire sizes listed in Table 3-4 and Table 3-5 are for copper wiringonly. If wire is run in an ambient temperature greater than 40°C, larger size wire may be necessary. Wiresizes are based on using the specified breakers.l 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 3-10 is notinstalled in the system.l Recommended wire sizes are based on NFPA National Electrical Code ® (NEC®)70 Table 310.15(B)(16) 75°Campacity with 40°C ambient correction factors.l 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.l Supported single source, single or dual feed power sources:- 3-wire grounded Wye (TN,TT)- 3-wire High Resistance Ground (IT)l Supported dual source, dual feed power sources:- 3-wire grounded Wye (TN, TT)CAUTIONSINGLE HIGH IMPEDANCE GROUND SOURCE – In North American installations, the neutralconductor from the high impedance ground source of supply CANNOT be used.l Phase rotation must be clockwise starting with phase A (rotation A,B,C).l Material and labor for external wiring requirements are to be supplied by designated personnel.NOTE Refer to the Eaton 93PM Sidecar Integrated Accessory Cabinet-Tie and Tie Bypass(50 kW and 100 kW SIAC-T, and 50 kW and 100 kW SIAC-TB) Installation andOperation Manual, listed in paragraph 1.8, for SIAC-T and SIAC-TB power wiringpreparation and requirements.
