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25.
Parallel system UPM and system bypass input feeds must come from the same source.
26.
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.
27.
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 page A ---13. 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.
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 tranformer 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.
DELTA SOURCES (TN-S) - The Powerware 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.
EATON Powerware
9390 UPS (100–160 kVA) Installation and Operation Manual S 164201554 Rev E powerware.com
®
C A U T I O N
C A U T I O N
DESCRIPTION:
POWER WIRING INSTALLATION NOTES
DRAWING NO:
164201554---5
REVISION:
E
Installation Information
SHEET:
10 of 15
DATE:
032406
A-21
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