Can long extension cords cause GFCI nuisance trips?

Yes, long extension cords can cause GFCI nuisance trips, especially with cheap or long cords. The extra length increases capacitance and potential for small current leaks, triggering the GFCI’s sensitivity. Use a heavy-duty, grounded 12-gauge or thicker cord and keep it short. If it keeps tripping, check the cord for damage or moisture before blaming the outlet.