Eaton 9390 - Page 176

161 Eaton® 9390 (100–160 kVA) UPS Installation and Operation Manual 164201604—Rev F
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POWER WIRING INSTALLATION NOTES
032406B
164201604-5
10 of 15
DESCRIPTION:
DATE:
:TEEHS:ON GNIWARD
REVISION:
25. Parallel system UPM and system bypass input feeds must come from the same source.
26. If the UPS is equipped with a sidecar, all connections are made to the sidecar terminals.
See the 9390 Sidecar manual 164201586 for wiring instructions.
27. Parallel UPM input wiring size requirements and output wiring size requirements from the
UPMs to the tie cabinet or distribution panel are the same as listed in Table E through
Table G.
28. 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. Install neutral conductors from the
UPMs to the common point of connection (tie cabinet), and then install a system neutral to
ground bonding jumper. If the recommended installation method cannot be accomplished,
each UPM should have a separate neutral to ground bonding jumper installed in
accordance with Note 7 on sheet 3 of this figure. DO NOT install both a source neutral and
a bonding jumper. See Table O through Table Q for system neutral bonding jumper wire
sizes. Bonding jumper must be copper wire.
CAUTION
HIGH IMPEDANCE GROUND SOURCES - If the source of supply 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 (PN 103005400) 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.
CAUTION
DELTA SOURCES (TN‐S) - The Eaton 9390 UPS system can be operated only from a delta supply source that is fully floating
and if the neutral‐forming transformer kit (PN 103005400) 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.
Installation Information
For Internal Use Only