Longer runs need thicker wire: at 100 ft a 12 A load wants 12 AWG or heavier, and 16 AWG can't carry it safely — the calculator shows the gauge to step up to.
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
16 AWG at 100 ft carrying ~12 A exceeds its ~10 A rating — inadequate (overheating/fire risk)
Ranked by fit to your answers
1
Inadequate — load exceeds the cord's safe current rating
90
SAFE NEXT CHECKUse a heavier cord — about 12 A at 100 ft needs at least 10 AWG. A cord that still powers the tool while overloaded overheats inside its jacket, so this is a fire concern, not just performance.
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.
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.
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.