International Electrotechnical Commission <br/><br/>
IEC/TR: 62271-310-2004-04; High-voltage switchgear and controlgear- Part310: Electrical endurance testing for circuit-breakers of rated voltage 72,5 kV and above 

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 - Geneva  International Electrotechnical Commission  2004 
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<br/><br/> Downloaded from the IEC website 
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