Eaton Power Xpert 9395 550/275 Installation And Operation Manual page 43

UPS Installation Plan and Unpacking
3 3 . . 2 2 . . 4 4 U U P P S S S S y y s s t t e e m m P P o o w w e e r r W W i i r r i i n n g g P P r r e e p p a a r r a a t t i i o o n n
Refer to national and local electrical codes for acceptable external wiring practices.
• To allow for future kVA upgrades, consider installing a derated UPS using wiring and external overcurrent
protection breakers sized for a fully rated UPS.
• For external wiring, use 90º C copper or aluminum wire. Wire sizes listed in
copper wiring only. If wire is run in an ambient temperature greater than 30º C, higher temperature wire
and/ or larger size wire may be necessary. Wire sizes are based on using the specified breakers.
• Wire ampacities are chosen from Table 310-16 of the National Electrical Code
copper wire with a 90º C rating.
• Material and labor for external wiring requirements are to be provided by designated personnel.
• 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.
• 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.
• If the load requires a neutral, a bypass source neutral must be provided.
• DO NOT install both a source neutral and a bonding jumper. See
sizes. The bonding jumper must be copper wire.
• Eaton UPS systems are designed to operate with two optional ground schemes. Both configurations
comply with international safety regulations (as seen on the UPS name plate).
1. Internal reference generated through an earth reference. Ground current will be equal to or less than
5% of the unit rating. This takes the form of a UPS N bus to ground bond wire.
2. Internally generated reference which avoids ground current. By locating the center reference inside
the three phase conductors, the relationship between the UPS source and the UPS output is
maintained. This is an internal UPS function and requires no additional work on the part of the installer
or user.
SINGLE HIGH IMPEDANCE GROUND SOURCE - In North American installations, the neutral conductor from
the high impedance ground source of supply CANNOT be used. DO NOT bond the inverter center point (E12)
to ground: this is an internal UPS function and requires no additional work by the installer or user.
DUAL HIGH IMPEDANCE GROUND SOURCE - In North American installations, the neutral conductor from the
high impedance ground source of supply CANNOT be used. DO NOT bond the inverter center point (E12) to
ground: this is an internal UPS function and requires no additional work by the installer or user. Please contact
the Eaton help desk listed in Chapter 1 for additional guidance regarding dual high impedance ground sources.
22 Eaton Power Xpert 9395 UPS Installation and Operation Manual 164201716—Rev 14
Table 5 and Table 6
® (NEC ® ). Specification is for
Table 10 for neutral bonding jumper wire
are for