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
Voltage drop is computed exactly as a round-trip 2 × length × current × resistance-per-foot, then expressed as a percent of 120 V; the numbers and the rule appear in the trace.
Two independent checks run: the load against a conservative per-gauge current ceiling (a fire question) and the voltage drop against 3% / 5% targets (a heat-and-performance question). The worse of the two sets the verdict.
Recommendations err toward a heavier cord — the safe direction — and current in amps is simply the appliance's watts divided by 120 on a standard circuit.
Where to stop. Choosing or replacing an extension cord is homeowner-safe. Manufacturers and fire authorities advise plugging high-draw heating appliances such as space heaters directly into a wall receptacle rather than any extension cord. Anything involving the building's wiring or circuit rating is a licensed electrician's job. 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.