Overview of 1+1 Redundant Parallel System with Common Battery Bank

MIB Mains input breaker/switch
BIB Bypass input breaker/switch
UIB Unit input breaker/switch
SSIB Static switch input breaker/switch
UOB Unit output breaker/switch
Ext. UOB External unit output breaker/switch
MBB Maintenance bypass breaker/switch
Ext. MBB External maintenance bypass breaker/switch
BB1 Battery breaker/switch 1
BB2 Battery breaker/switch 2
NOTE: Refer to Appendix: Switch/Breaker Details for the disconnecting device type.
NOTE: For UPS with internal batteries, the batteries must be removed and the internal battery breaker (BB) must be padlocked in the open (OFF) position.
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