Smart Grid Solutions' fault indicators are clamp‑on CT devices (overhead and underground) demonstrated on a 12,470 V feeder; they install with a hot stick while energized, report faults via red LED (amber for momentary bumps), work on conductor sizes from ~#4 up to 556 (0.3–1.7 in), and include a fiber optic adapter for padmounts — though the author recorded a false indication in one outage.