SEFE00614Cable boxCable glandCable gland/shealthearth connection“Incorrect”No operation“Correct”OperationSEFFigure 67: Positioning of core balance current transformersIf the cable sheath is terminated at the cable gland and directly earthed at that point, a cable fault (from phase tosheath) will not result in any unbalanced current in the core balance CT. Therefore, prior to earthing, theconnection must be brought back through the CBCT and earthed on the feeder side. This then ensures correctrelay operation during earth fault conditions.Chapter 6 - Current Protection Functions P14x138 P14xEd1-TM-EN-1
