If I recall my electronics/telecommunications classes correctly, you would only need very little current. You could also send short pulses and wait for the "ech

If I recall my electronics/telecommunications classes correctly, you would only need very little current. You could also send short pulses and wait for the "echo" back to have a rough estimate of where the cable is broken. The biggest issue I see is about the cable length: you would need to use high voltages to make up for the losses and fault location would become way more difficult. Another option would be break up the cable in smaller sections and monitor each of these independently, but I don't know if that's a valid option for this use case since the entire point of the eruv is that it must be continuous (maybe the sections could be tied together using non-conductive materials?)