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PARALLEL INSTALLATION
EATON Powerware
®
9155 Parallel UPS (8–15 kVA) User’s Guide S 164201592 Rev C www.powerware.com
14
WARNING
Only qualified service personnel (such as a licensed electrician) should perform the UPS
installation and initial startup. Risk of electrical shock.
To hardwire the parallel system:
1. Verify that the electrical connections to the installation site have
been properly installed.
2. A wall-mounted, user-supplied, readily-accessible disconnection
device must be incorporated in the input wiring.
Compare the circuit breaker ratings and wire sizes to the ones in
the following wiring table:
Table 1. Circuit Breaker Ratings
UPS Capacity Input Circuit Breaker Rating Minimum Wire Size*
8kVA 60A 4AWG(21.2mm
2
)
10 kVA 80A 3AWG(26.7mm
2
)
12 kVA 100A 2AWG(33.6mm
2
)
15 kVA 100A 2AWG(33.6mm
2
)
*Use only 75°C-rated copper wire. Minimum wire size is based on 120/208 full load
ratings applied to NEC Code Table 310-16. Code may require a larger AWG size than
shown in this table because of temperature, number of conductors in the conduit, or
long service runs. Follow local requirements.
NOTE To accommodate the feature of easy system expandability, it is recommended that
initial installation of the Powerware 9155 UPS contain wiring to support the maximum
capacity of the UPS cabinet.
3. Switch off utility power to the distribution point where the parallel
tie cabinet and UPSs will be connected. Be absolutely sure there is
no power.
4. Determine your equipment’s grounding requirements according to
your local electrical code.