Equipment should not be directly earthed but should be connected to a surge protector, which is then connected to earth ground. Incoming wires, such as telephone lines, should be earth grounded, away from the equipment, to prevent destructive paths to earth. Low impedance earthing wires without sharp bends or splices should be used to ensure proper grounding. The use of low capacitance surge protectors, such as Gas Discharge Tubes (GDTs), for coaxial cables is recommended to minimize signal propagation interference.