Powerware 5075 kVA operation manual Table G. Maximum Input Circuit Breaker Ratings

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
	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
	208V		400V	480V
Balanced Power 75	300		N/A	125
Balanced Power 62.5	225		125	100
Balanced Power 50	175		90	80

	DESCRIPTION:	INSTALLATION NOTES
	DRAWING NO:	164201261---1			SHEET: 6 of 11
	REVISION: E		DATE:	093001
Powerware BPIII Harsh Environment UPS 50--75 kVA Installation and Operation						A---7

164201261 Rev. F 111503