Rating Factors Medium Voltage - Paper Insulated MV Paper Rating Factors in Ducts MV Paper Rating Factors in Air MV Paper Rating Factors in Ground Medium Voltage - XLPE Insulated MV XLPE Rating Factors in Ground MV XLPE Rating Factors in Ducts or Pipes MV XLPE Rating Factors in Air High Voltage HV XLPE Rating Factors in Air HV XLPE Rating Factors in Ground Low Voltage LV Rating Factors in Ground LV Rating Factors in Air