Pset_SectionInsulator Properties applicable to the insulator type of discrete accessory, indicated that the insulator is a section insulator used in the overhead contact line system. IfcDiscreteAccessory/INSULATOR IfcDiscreteAccessory/INSULATOR ACResistance The resistance under AC. NumberOfWires The number of wires used in the element. IsArcSuppressing Indicates whether the element has the ability to suppress an arc. TensileStrength Indicates the ability to withstand breakage apart under applied force.