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UPS Installation Plan and Unpacking
3.2.2
UPS System Power Wiring Preparation
NOTE 1
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 power upgrades, Eaton recommends installing the UPS using wiring and external
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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. 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, 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,
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bypass, and rectifier and bypass ground wiring if the recommended output breaker listed in Table 3-8 is not
installed in the system.
Recommended wire sizes are based on NFPA National Electrical Code
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ampacity with 40°C ambient correction factors.
The neutral conductor is sized the same as the phase conductor for balanced and resistive loads. Non-linear
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loads, up to the maximum of 1.5x the load current, require a larger neutral conductor and should be sized in
accordance with NFPA NEC 70 Article 310.15(B)(5).
Connect rectifier input to a 3 wire, grounded Wye source. A neutral conductor is not used from the
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rectifier source.
Supported single source, single or dual feed power sources:
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- 3-wire grounded Wye (TN,TT) – Rectifier Input
- 4-wire grounded Wye (TN,TT) – Bypass Input
Supported dual source, dual feed power sources:
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- 3-wire grounded Wye (TN, TT) – Rectifier Input
- 4-wire grounded Wye (TN, TT) – Bypass Input
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).
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Material and labor for external wiring requirements are to be supplied by designated personnel.
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3-12
Eaton 93PM UPS (20–50 kW, 480V Four Wire – 50 kW Frame) Installation and Operation Manual P-164000540—Rev 4
Refer to the Eaton 93PM Sidecar Integrated Accessory Cabinet-Bypass Installation
and Operation (50 kW and 100 kW SIAC-B) Manual, listed in paragraph 1.8, for
SIAC-B power wiring preparation and requirements.
WARNING
®
(NEC
CAUTION
®
) 70 Table 310.15(B)(16) 75°C
www.eaton.com/powerquality
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