A system to locate as simply as possible an incursion of water in pipes or cables uses a measuring circuit that has a water sensor situated under the sheath of the cable or pipe and consisting of a moisture-sensitively insulated measurement line (ML1) and an uninsulated line (EL1). To this water sensor is associated a third, auxiliary line (HL) that is insulated, relative to the measurement line, insensitively to moisture. These three lines are connected together through resistors (RM, RA, RB) at the entry into and end of the pipe or cable so that when a voltage is applied between measurement line and uninsulated line, measurable currents flow in all lines, the magnitude of which changes with the occurrence of moisture. From the distribution of current the fault can be located. In twin-core pipe or cable installations the auxiliary line constitutes the measurement line (ML) and is situated in the second pipe or cable core. With a three-core pipe or cable installation an additional measurement line (ML) is situated in the third pipe or cable.
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