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The Murray loop bridge is a bridge circuit used for locating faults in underground or underwater cables. It has been used for more than 100 years but is being replaced by the more precise Time-domain reflectometer.
One end of the faulted cable is connected through a pair of resistors to the voltage source. Also a null detector is connected. The other end of the cable is shorted. The bridge is brought to balance by changing the values of RB1 and RB2, which is achieved when:
R x R g + R y = R B 1 R B 2 {\displaystyle {\frac {R_{x}}{R_{g}+R_{y}}}={\frac {R_{B1}}{R_{B2}}}}
which is equivalent to: