Long extension cords can cause GFCI nuisance trips.

Yes, you can, but it will trip more often — especially with a long or cheap cord.

GFCI outlets work by detecting tiny imbalances in current. An extension cord adds extra length, which means more capacitance and more potential for small current leaks to ground. That’s why a GFCI that was fine with a tool plugged directly into the wall suddenly trips when you add a 100-foot cord. It’s usually not a safety problem, just an annoyance.

Use a heavy-duty, grounded extension cord (12-gauge or thicker) and keep it as short as practical. If it keeps tripping, the cord might have damage or moisture inside. Swap it out.

If it trips, check the cord before blaming the outlet.