POWER WIRING INSTALLATION NOTES
081505C
164201554---5
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Installation Information
A-20
EATON Powerware
®
9390 UPS (100–160 kVA) Installation and Operation Manual S 164201554 Rev E powerware.com
19. There is no DC disconnect device within the UPS.
20. A battery disconnect switch is recommended, and may be required by NEC or local codes
when batteries are remotely located. The battery disconnect switch should be installed
between the battery and the UPS.
CAUTION
Every battery cabinet must have a UVR-type DC circuit breaker with an auxiliary contact.
Failure to use this typ e of circuit breaker may cause severe damage to the UPS and create a
personnel h azard. Note that all battery cabinets provided by the UPS manufacturer have this
circuit breaker as a standard f eature.
21. External DC input overcurrent protection and disconnect switch for the remote battery
location is to be provided by the user. Table M lists the maximum rating for continuous-duty
rated circuit breakers satisfying the criteria for both.
Table M. Maximum DC Input Circuit Breaker Ratings
UPS Model
Input Voltage Rating
208V/220V 480V
Powerware 9390---120/100
Powerware 9390---160/100
400A 400A
Powerware 9390---120/120
Powerware 9390---160/120
450A 450A
Powerware 9390---160/160 600A 600A
22. Battery voltage is computed at 2 volts per cell as defined by Article 480 of the NEC.
Rated battery current is computed at 2 volts per cell.
23. The battery wiring used between the battery and the UPS should not allow a voltage drop
of more than 1% of nominal DC voltage at rated battery current.
24. If the conductors used for DC input from the battery cabinets to the UPS are those
provided by the UPS manufacturer, and the UPS and battery cabinets are manufactured by
the same supplier, then it is acceptable if they do not meet the noted minimum conductor
sizes.
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