Powerware 9390, Installation & Operation Manual, Page: 121 / 138

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POWER WIRING INSTALLATION NOTES
062504
DESCRIPTION:
DATE:
DRAWING NO: SHEET:
REVISION:
A
164201535---5
Installation Information
A-13
Powerware
®
9390 UPS (40–80 kVA) Installation and Operation Manual
S
164201535 Rev A
17.
There is no DC disconnect device within the UPS.
18.
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 battery and UPS.
19.
External DC input overcurrent protection and disconnect switch for remote battery location
is to be provided by the user. Table L lists the maximum rating for continuous duty rated
circuit breakers satisfying the criteria for both.
Table L. Maximum DC Input Circuit Breaker Ratings
UPS Model
Input Voltage Rating
UPS Model
208V 480V
9390---80/40 150A 150A
9390---80/80 300A 300A
20.
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.
21.
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.
22.
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.