Fujitsu BX600 S2 ユーザーズマニュアル

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PRIMERGY BX600 S2 Basic Unit
 47
Installing the Hardware
Connecting the System to the Mains
I
Please make sure that each of the power supply units is connected to a 
different phase. This will provide you with additional phase redundancy 
for high availability configurations. If one phase has failed, the power 
supply units connected to the other phases keep active. You can get full 
phase redundancy with up to three power supply units. With four power 
supply units, two of them are to be connected to one phase (see also 
Phase redundancy is possible in regions, where a single phase provides 
200 - 240V; in other regions with lower single phase voltage, two phases 
must be coupled and complete phase redundancy thus is not possible.