The most dangerous miswire — the grounding conductor and metal chassis can be energized. Shut the circuit off and correct before use.
Stop and call a licensed electrician or emergency services now if there's smoke, sparks, a burning smell, heat, shock, or water near the problem. Otherwise it's safe to answer the questions below.
The likely readout
Most likely cause
Hot and ground reversed — the most dangerous miswire: the grounding conductor and a device's metal chassis can be energized
Ranked by fit to your answers
1
Hot and ground reversed — the most dangerous miswire: the grounding conductor and a device's metal chassis can be energized
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SAFE NEXT CHECKStop using this outlet now and shut the circuit off at the panel. With hot and ground swapped, exposed metal can be live; this is a correct-immediately condition.
Where to stop. This is a correct-immediately condition: shut the circuit off at the panel and do not use the outlet. Reading a plug-in tester is homeowner-safe; correcting any miswire means working at the receptacle terminals with live conductors — if you cannot do that safely with the power off at the breaker, stop and call a licensed electrician. A 3-lamp tester cannot detect a bootleg ground, a reversed multi-wire circuit, or undersized wiring. This is general information, not a quote and not a substitute for a licensed electrician.
Try the safe next check above. If it doesn't resolve it, or would mean working on wiring or a panel, stop and call a licensed electrician — don't replace parts on a guess. Open the full tool to change any answer for your exact situation, or try a related check below.
source-governed · verified 2026-06-20
Sources
code NEC 406 — Receptacle wiring and configuration requirements · verified 2026-06-20
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.