The ranking is rules, not opinion — here is exactly how an answer set becomes a ranked result and a safe next check.
source-governedDiagnostic estimate. Not a quote, not a substitute for a licensed electrician.sources verified 2026-06-20view sources ↓
Method
Each indicator reading maps to transparent rules; the rules that fire and their weights are shown as a trace, so the status is inspectable rather than asserted.
Status is read from the unit's indicator light(s). If no indicator can be read at all, the tool fails closed and asks for a reading before reporting anything.
Grounding is scored independently of MOV state, because intact protection on an ungrounded outlet is still ineffective. Outcomes below the leader stay visible so a secondary issue isn't hidden.
Sources
standard UL 1449 — Standard for Surge Protective Devices · verified 2026-06-20
Where to stop. Swapping a plug-in surge strip is homeowner-safe. If the "Grounded" light is off, the receptacle itself may be ungrounded or miswired — confirm with a plug-in tester, and because correcting house wiring means live conductors, if a tester shows an open ground have a licensed electrician verify the outlet. This is general information, not a quote and not a substitute for a licensed electrician.
Electrical Fault Check provides general diagnostic information only. It is not professional advice, not a quote, and not a substitute for a licensed electrician. Do not work on live wiring. If you see smoke, sparks, burning smell, heat, shock, water exposure, or repeated tripping, stop using the circuit and contact a licensed electrician or emergency services as appropriate.