Line currents could be varying because of faulty ground or neutral. Or it has gone bad.
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This could be caused by a ground fault in the wiring or a faulty GFCI outlet. You may need to have a professional electrician inspect the wiring to identify and resolve the issue. Avoid using the GFCI outlet until the problem is resolved to ensure safety.
Yes, it is recommended to have a GFCI (ground fault circuit interrupter) protection for a spa even if it is being plugged into a GFCI circuit. This redundancy provides an extra layer of safety in case of any issues with the existing circuit.
You can determine if an outlet is after a GFCI by pressing the "test" button on the GFCI outlet. If the GFCI trips and cuts off power to the outlet, then that outlet is downstream from the GFCI. If power is not cut off, then that outlet is upstream from the GFCI.
It is not required for a microwave to be plugged into a GFCI outlet, but it is recommended for safety reasons, especially in locations like kitchens or bathrooms where there may be water present. GFCI outlets help protect against electrical shocks in wet environments.
When a GFCI-protected extension cord is plugged into an outlet that is also GFCI protected, it provides an additional layer of protection against electric shock. Both devices work in conjunction to quickly detect any imbalance in the electrical current and trip the circuit if necessary. This redundancy helps ensure increased safety against electrical hazards.
A 20 amp GFCI outlet will trip when the current exceeds 20 amps by a certain amount, typically around 5 mA to 6 mA, which is the typical trip threshold for GFCI outlets.