Abstract: Test connector apparatus having an elongate tubular body housing a rotary switch, a cord extending from one end of the body to terminate with an adapter head, a rotary knob at the other end of the body to actuate the rotary switch, a plurality of terminals in the rotary knob electrically connected to the adapter head by the rotary switch and the cord, and a plurality of test heads having differently configured test probes electrically connectable to differently configured test access points electrically connected between conductor pairs, wherein the plurality of test heads are interchangeably electrically connectable to the adapter head.

Abstract: Test connector apparatus having an elongate tubular body housing a rotary switch, a cord extending from one end of the body to terminate with an adapter head, a rotary knob at the other end of the body to actuate the rotary switch, a plurality of terminals in the rotary knob electrically connected to the adapter head by the rotary switch and the cord, and a plurality of test heads having differently configured test probes electrically connectable to differently configured test access points electrically connected between conductor pairs, wherein the plurality of test heads are interchangeably electrically connectable to the adapter head.

Abstract: A device (32) determines the location of a fault in an underground cable causing an earth leakage path from an internal conductor to earth at the location of the fault, such that when a signal is applied to the conductor, an earth leakage signal flows between the earth and conductor at the location of the fault. A multi-frequency signal is applied to the cable, this having at least two frequency components. Probes (24a, 24b) are positionable to receive the earth leakage signal. A processor (50) rectifies a first component of the earth leakage signal, corresponding to one frequency component of the applied signal, multiplies the rectified first component of the earth leakage signal with a second component of the earth linkage signal, corresponding to another frequency component of the applied signal, and from the result of that multiplication indicates the direction from the device to the fault.