7 on a 15 amp circuit and 9 on a 20 amp circuit.
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A GFCI can detect ground faults on the specific circuit it is connected to. If multiple outlets are on the same circuit protected by a single GFCI outlet, the GFCI can protect all of them. However, if the outlets are on different circuits or not downstream from the GFCI, they would need their own GFCI protection.
If each outlet draws less than 2 amps, then you could control 10 outlets with a 20 amp GFCI outlet on a 20 amp circuit. However, it's worth consulting an electrician to ensure the load calculations are accurate and the wiring is safe for the intended use.
Eight on a 15 amp circuit, tweleve on a 20 amp circuit, including the gfci receptacle itself.
GFCI receptacles are designed to trip at around 5 milliamps (0.005 amps) of current leakage to ground. When the GFCI detects this level of imbalance, it quickly shuts off the power to prevent electric shock.
Power washing may have caused water to enter the outlets, triggering the GFCI protection to trip. Allow the outlets to completely dry before attempting to reset them. If they still won't reset, there may be water damage or a wiring issue that needs to be addressed by a professional electrician.
You can have multiple GFCI outlets on one circuit; it is common to have them daisy-chained in a series. However, it is recommended to consult with a licensed electrician to ensure proper wiring and compliance with local electrical codes.