Whenever　a　fault　occurs　in　the　underground　cable　line　for　some　reason,　repairing　wires　of　that　faulty　cable　becomes　quite　difficult　because　of　a　lack　of　a　proper　system　for　tracking　the　precise　fault　location.　A　system　needs　to　be　developed　that　can　find　the　precise　location　of　the　occurred　fault　in　the　system　for　all　the　three　phases　R,　Y,　and　B　for　different　types　of　faults　conditions.　By　Ohm＇s　Law,　it　is　found　that　the　resistance　of　the　cable　is　proportional　to　its　length　under　constant　conditions　of　temperature　and　the　cross-section　area.　Here　a　system　is　developed　which　consists　of　a　microcontroller,　LCD　display,　Fault　Sensing　Circuit　Module,　Wi-Fi　Module,　and　proper　power　supply　arrangement　with　regulated　power　output.　Current　in　the　circuit　is　sensed　by　the　relays　which　are　interconnected　with　the　microcontroller.　The　fault　sensing　circuit　is　made　with　the　combination　of　a　set　of　series　resistors　and　switches　alongside　each　resistor.　This　proposed　system　is　simulated　and　tested　on　PROTEUS　version　8.1　and　the　hardware　is　designed　on　the　basis　of　simulated　design.　In　the　end,　the　Fault　is　not　only　detected　but　also　located　at　the　exact　location　and　has　been　shown　on　website　＇Things　peak.＇　©　2020　IEEE.