UPS INSTALLATION PLAN AND UNPACKING
Eaton 9395 550/275 UPS (225–550 kVA) Installation and Operation Manual
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164201716 Rev 2
www.eaton.com/powerquality
3-7
3.2.2
UPS System Power Wiring Preparation
Read and understand the following notes while planning and performing the
installation:
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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 protection breakers sized for a fully rated UPS.
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For external wiring, use 90
°
C copper or aluminum wire. Wire sizes listed in
Table 3‐4 and Table 3‐6 are for copper wiring only. If wire is run in an ambient
temperature greater than 30
°
C, higher temperature wire and/or larger size wire
may be necessary. Wire sizes are based on using the specified breakers.
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Wire ampacities are chosen from Table 310-16 of the National Electrical Code
®
(NEC
®
). Specification is for copper wire with a 90
°
C rating.
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Material and labor for external wiring requirements are to be provided by
designated personnel.
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If installing a maintenance bypass, a minimum of two separate feeds with
upstream feeder breakers, or a single feed with two upstream feeder breakers,
must be provided: one for the UPS or rectifier input breaker (RIB) (if installed) and
one for the maintenance bypass input. DO NOT use a single feed or a single feeder
breaker to supply both the UPS or RIB and the maintenance bypass. If a bypass
input breaker (BIB) is installed in the maintenance bypass and a single-feed UPS is
being installed, a single feed to the maintenance bypass is acceptable for supplying
both the UPS and the bypass.
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The bypass feed into this equipment uses three or four wires. The rectifier feed
into this equipment uses three wires. The phases must be symmetrical about
ground (from a Wye source) for proper equipment operation.
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If the load requires a neutral, a bypass source neutral must be provided. If the load
does not require a neutral and there is no neutral conductor connected at the
bypass input, a neutral to ground bonding jumper must be installed. DO NOT install
both a source neutral and a bonding jumper. See Table 3‐4 or Table 3‐6 for neutral
bonding jumper wire sizes. The bonding jumper must be copper wire.
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HIGH IMPEDANCE GROUND SOURCES - If the supply source is a high impedance ground (IT) type, the input
neutral conductor must be connected from the source of supply. If there is no output neutral connected to
the UPS, the neutral‐forming transformer kit may be used instead of pulling a neutral from the source. If the
load requires a neutral, then an input neutral conductor must be pulled into the UPS. In no circumstances
shall a neutral to ground bonding jumper be installed in the UPS.
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DELTA SOURCES (TN‐S) - The 9390 UPS system can be operated only from a delta supply source that is fully
floating and if the neutral‐forming transformer kit is installed in the UPS. The UPS cannot be operated from a
mid‐point or end‐point grounded delta supply source. With this type of supply source, there is no capability
to provide an output neutral. In no circumstances shall a neutral to ground bonding jumper be installed in the
UPS.
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The UPS cabinet is shipped with a debris shield covering the ventilation grill on top
of the unit. Do not remove the debris shield until installation is complete. However,
remove the shield before operating the UPS. Once the debris shield is removed, do
not place objects on the ventilation grill.
