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No, it is not safe to use an outlet that sparked. A spark from an outlet could indicate a short circuit, loose or frayed wiring, or other serious damage. Continuing to use an outlet that sparks can increase the risk of electrical shock, electrical fires, and other hazards. It's important to turn off the power to the outlet at the circuit breaker if possible and avoid using the outlet until a licensed electrician has inspected and repaired it.

Regular inspections, battery replacements, and testing alarms help maintain reliability.

You can let a fire burn out in a fireplace as long as you or someone else will stick around to monitor it until it goes completely out. This may take several hours. To prepare, stop adding fuel to the fire well before you’re ready to call it a night. If you’re using the fireplace for warmth, you’ll want to cover up in some blankets as the flame dies down.

Grounding is a great first step to prevent electrical shock, but you can take it further with GFCI outlets and AFCIs (arc fault circuit interrupters). In particular, AFCIs help protect against the type of electrical arcs that cause fires, like if a mouse chews on a wire or your laptop starts overheating at the wall. These are required in some areas of your home.