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POWER WIRING INSTALLATION NOTES
032406B
164201604---5
10 of 15
DESCRIPTION:
DATE:
DRAWING NO: SHEET:
REVISION:
Installation Information
A-21
EATON Powerware
®
9390 UPS (100–160 kVA) Installation and Operation Manual S 164201604 Rev B powerware.com
25. Parallel system UPM and system bypass input feeds must come from the same source.
26. Parallel UPM input w iring 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 i nstalled 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.
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 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 b e installed in the UPS.
CAUTION
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.