International Electrotechnical Commission <br/><br/>
IEC: 60660-1999: Insulators- Tests on indoor post insulators of organic material for systems with nominal voltages greater than 1 000 V up to but not including 300 kV 

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 - Geneva  Internatioanl Electrotechncial Commission  1999 
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<br/><br/> Downloaded from the IEC website 
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