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We have to apply the derating value informed on the Technical guide 7040x0 item 3.1 ¨Derating Factor for the Voltage" to the Tension ( ex0,88=3000m ) . It means that all values of voltage will be derated as Ui , Uimp etc. Also to the current using the "¨Derating Factor for the Circuit Breaker"( ex 0,99=3000m), this value must be applied also on the current of the circuit Breakers informed on Technical guide.