If your home goes dark from an electrical blackout, an electric generator can be a great resource for homeowners, especially if the storm and damage is severe and the outage is prolonged. But small portable generators pose risks homeowners need to guard against: carbon monoxide poisoning, electrocution or electric shock, and fire.

Risk #1: Carbon Monoxide Poisoning

Small generators use a combustion engine that usually burns gasoline or other liquid fuels. Like any gas-powered machine, these small engines produce carbon monoxide. To prevent carbon monoxide (CO) poisoning, keep generators outdoors, away from doors, windows and vents. Position your generator’s exhaust away from your home and locate the generator downwind, if possible.

Risk #2: Electrocution or Electric Shock

To avoid the risk of electrocution, do not use a generator in rainy or wet conditions. It’s also important to not handle the generator with wet hands to avoid electric shock. Before plugging appliances or electronics into your generator, make sure your generator is sized appropriately for the total electric load you want it to run. Make sure the cords all fit appropriately and are undamaged. To keep utility workers, neighbors and those in your household from electrocution dangers, never plug your generator directly into your home’s wiring.”Backfeeding” sends power from the generator throughout your house in reverse and can even feed onto your electric utility’s powerlines. Workers attempting to restore power might unexpectedly encounter this high voltage, which could cause fatal shock. To prevent a”backfeed,”have a professional install a transfer switch if you want your generator to run your home’s electrical system during an outage.

Risk #3: Burns and Fire

When using a generator, store extra fuel in an American National Standards Institute-approved container in a cool, well-ventilated place away from fuel-burning appliances. Before refueling your generator, turn it off and let it cool. Gasoline spilled on hot engine parts could ignite. Keeping these three risks in mind when installing or using your home’s generator will aid in your safety, your home and others.