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Old 31st Oct 2008, 04:51
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aveng
 
Join Date: Feb 2005
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The battery bus receives power from the 28v dc battery
bus bar or TRU 3, via spcu (supply depends upon whether AC power available). The switched hot battery bus receives power from the battery bus bar -via the spcu (standby power control unit) - through a relay driven by the battery switch (essentially direct power from battery bus bar when battery switch closed).
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