International Electrotechnical Commission <br/><br/>
IEC: 60909-3-2003-09; Short-circuit currents in three-phase a.c. systems- Part 3: Currents during two separate simultaneous line-to-earth short circuits and partial short-circuit currents flowing through earth 

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 - Geneva  International Electrotechnical Commission  2003 
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<br/><br/> Downloaded from the IEC website 
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