Notice heat, odor, and repeated failure
Warm plugs, scorched outlets, flickering lights, buzzing, sparks, and repeated breaker trips are not normal annoyances. Unplug an appliance when it is safe to do so and stop using the affected outlet or circuit until it has been evaluated.
If there is active smoke, fire, or a strong burning odor, leave and call 911. Do not touch energized equipment or use water on an electrical fire.
Use cords for the job they were designed to do
Extension cords are temporary, not permanent wiring. Replace frayed, cracked, pinched, or loose cords. Do not run cords under rugs or through doorways where heat and damage can go unnoticed.
Heat-producing appliances such as portable heaters, microwaves, and coffee makers need appropriate wall outlets. Follow the manufacturer instructions and avoid daisy-chaining power strips.
Bring in the right professional
A breaker protects a circuit by opening when conditions are unsafe. Repeatedly resetting it without finding the cause can leave the underlying hazard in place. Ask a licensed electrician to diagnose recurring trips, damaged wiring, or changes in how the system behaves.
Sources and further help
This is general information. Follow instructions from firefighters, medical professionals, utilities, building officials, and your insurer.