This paper presents the system to ascertain the length of faulty cable in kilometres by employing NANO ARDUINO outfit. In numerous Municipal fields, the underground cable method is employed. When faults or abnormalities occur due to any reason, it is difficult to rectify the quandary because of not perceiving the exact location of the fault. The proposed method is to localize the exact location or spot of the fault. The system employs the standard principle of Ohm’s Law i.e. the current changes depending upon the fault distance, where small voltage is employed at feeder end over series resistors. Consequently the voltage across the resistors alters which is calibrated in distance after feeding the data to inherent ADC of NANO ARDUINO outfit, and displayed on digital seven segment display. The hardware system is designed in such manner the series resistors, which are depicting cable length in kilometres, and short circuit fault formation is done with the switches at each comprehend kilometre to verify the correctness of the design. Hereafter, the work will be amplified with the application of capacitor in an AC system for finding the impedance, which will localize the open circuit in underground cable.