Powerware 5075 kVA - Manual (Page 139)

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6 of 11
INSTALLATION NOTES
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REVISION: E
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164201261---1
A---7 Powerware BPIII Harsh Environment UPS 50--75 kVA Installation and Operatio n
164201261 Rev. F 111503
16. Battery voltage is computed at 2 volts per cell as defined by Article 480 of the NEC. Rated
battery current is computed at 1.8 volts per cell.
17. 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.
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 may be supplied as an
accessory, and should be installed between the battery and the UPS.
19. Table G lists the maximum rating for input circuit protective devices (circuit breakers).
Table G. Maximum Input Circuit Breaker Ratings
Balanced Power System
Input Voltage Rating
Balanced Power System
208V 400V 480V 600V
Balanced Power 75 400 N/A 175 150
Balanced Power 62.5 350 175 150 125
Balanced Power 50 300 150 125 100
20. Source protection for AC input should be treated as if supplying a three phase transformer
with a rating 1.4 times the UPS kVA rating, to allow for transformer magnetization inrush
current.
21. The input breaker (CB1) has a trip rating of 150 amps AT for the 400, 480 and 600 volt input
UPS and 320 amps AT for the 208 volt input UPS.
22. The bypass feed into this equipment utilizes either three or four wires. The rectifier feed
into this equipment utilizes three wires. However, the phases must be symmetrical about
ground (i.e., from a Wye source) for proper equipment operation. Failure to follow these
instructions will void the product warranty.
23. The line-to-line unbalanced output capability of the UPS is limited by the full load per phase
current values for AC output to critical load shown in Tables A through C. The
recommended line-to-line load unbalance is 50% or less.
24. Table H lists the maximum rating for output circuit protection devices (circuit breakers).
Table H. Maximum Output Circuit Breaker Ratings
Balanced Power System
Output Voltage Rating
Balanced Power System
208V 400V 480V
Balanced Power 75 300 N/A 125
Balanced Power 62.5 225 125 100
Balanced Power 50 175 90 80