What are GFCI outlets? Plus 5 household items you should never plug into one

Source: ZDNet

While GFCI outlets offer reliable protection compared with standard outlets, they aren’t meant for every type of electrical device. Some items should never be plugged into a GFCI, as they could malfunction or trip the circuit unnecessarily, leading to power disruptions or unsafe situations. Below is a list of devices not suited for GFCIs.

Devices with a “high inrush” current

Appliances like refrigerators, freezers, air‑conditioner units, and power tools require a serious initial burst of electricity when powered on. Even though refrigerators are almost always located in kitchens, they can cause the GFCI to trip because of the large initial surge of current, even if there is no actual fault. This is known as “nuisance tripping.” Don’t risk spoiling a fridge full of food by plugging it into a GFCI.

Outdoor equipment

Outdoor equipment such as electric lawnmowers or pressure washers should ideally be plugged into a dedicated outdoor outlet. While GFCIs are designed for outdoor use to reduce shock hazards, high‑powered equipment can cause the GFCI to trip if it draws too much current at one time.

High‑powered appliances

Appliances that use significant power, such as space heaters, microwave ovens, or vacuum cleaners, can cause a GFCI outlet to trip, especially if they are used on a circuit with other high loads. This can lead to frequent nuisance tripping.

Surge protectors or power strips

Some power strips and surge protectors, particularly those with multiple plugs for high‑powered devices, could cause the GFCI outlet to trip due to the combined electrical load. A sudden power surge or imbalance could trigger the GFCI unexpectedly, defeating its purpose and causing repeated circuit tripping.

Medical equipment

Medical equipment like CPAP machines and oxygen concentrators require continuous, uninterrupted power. It is advisable to plug these vital devices into conventional outlets, not GFCIs, because the GFCI may trip unnecessarily, causing a loss of power to life‑sustaining equipment.

Bonus: Sump pumps

While the National Electrical Code (NEC) specifically mandates that new construction includes GFCIs in basements, there is an ironic exclusion: sump pumps. Sump pumps are designed to prevent flooding, but if the GFCI trips and cuts off its power, your basement might end up under several inches of water.