44..33..33 UUPPSS ssyysstteemm ppoowweerr wwiirriinngg pprreeppaarraattiioonnss
CAUTION
When you are installing a maintenance bypass, use a dual-feed input protected
by an upstream circuit breaker or a single-feed input protected by two upstream
circuit breakers, one for the UPS/rectifier input breaker (if installed), and the
other for the maintenance bypass input. Do not use only a single-feed and
single-breaker protection for the UPS/rectifier input and maintenance bypass. If
the UPS uses a single feeder line and a bypass input breaker is mounted on the
maintenance bypass, a maintenance bypass single-feed input is allowed, and
power can be supplied to the UPS and bypass simultaneously.
Read and understand the following guidelines when planning and performing the installation:
• Refer to national and local electrical codes for acceptable external wiring practices.
• To allow for future kVA upgrades, select the power line and the external overcurrent protection switch
for derating under full load.
• Material and labor required for external wiring are not part of the UPS delivery.
• For external wiring, use copper cable rated for 90 ℃ at minimum. For more information, refer to Table
7: Input/output ratings and external cabling recommendations for the 93T UPS 15–80 kVA. Cable sizes
are based on using the specified circuit breakers.
• If the operating temperature of the conductor rises above 40 ℃, use a larger size cable or a cable that
is resistant to higher temperatures.
• The wiring specifications are for 90 ℃ rated copper cables.
• Use a wire with an applicable size to allow future upgrades.
CAUTION
For UPS systems configured with a 4-pole ATS or generator:
The input uses three live wires, a neutral wire, and a protective earthing
conductor. The phase lines must be symmetrical about ground (from a Wye
source) for proper equipment operation.
Support loads with a neutral wire.
Make sure that the switching of the upstream ATS does not disconnect the
neutral wire, or that the system recovers from an input neutral wire
disconnection before a low battery voltage alert.
When the neutral wire is disconnected, make sure that all phase lines are also
disconnected.
Table 7. Input/output ratings and external cabling recommendations for the 93T UPS 15–80 kVA
Unit Rating 50/60 Hz
Basic unit rating kVA 15 20 30 40 60 80
Input/output voltage Volts 400/
400
400/
400
400/
400
400/
400
400/
400
400/
400
Rectifier input (5-wire) A 27 36 54 72 108 144
EATON 93T USER’S AND INSTALLATION GUIDE 614-40270
-
December 2023 www.eaton.eu 3333
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