public HeaderFooterData(enumVoltageClassGlobal VoltageClass, List <DateTimePeriod> periodsList) //double HighLimit
 {
     this.VoltageClass = VoltageClass;
     this.PeriodsList  = periodsList;
     //this.HighLimit = HighLimit;
 }
 public HeaderFooterData(enumVoltageClassGlobal VoltageClass, double HighLimit)
 {
     this.VoltageClass = VoltageClass;
     this.HighLimit    = HighLimit;
 }