Abstract: Apparatus is described for detecting the presence of a variety of electrical faults in a multi-pair shielded cable from a junction box connected to the cable at one end and to a socket connected to the cable at the other end. The apparatus includes a first module which is adapted to be connected to the appropriate set of terminals of a main junction box connected to one end of the cable and a second module which is adapted to be connected to the socket at the other end of the cable. To use the apparatus each module is connected to its respective termination. The first module includes a battery, a termination and a plurality of light emitting diodes, resistors and switches arranged to give a visual indication of faults in the form of shorts between two wires in the cable, shorts between one wire in the cable and the grounding shield and continuity between a pair of wires in the cable.