Generator Safety: Carbon Monoxide, Backfeed, and the Rules That Save Lives
Generator safety essentials: CO placement rules, why backfeeding kills, wet-weather operation, and safe refueling.
Every storm season, preventable generator deaths make the news, essentially all of them portable units run indoors or too close to the house. The rules are few and absolute; here they are, plus the standby-generator safety facts homeowners ask about.
Carbon monoxide: the 20-foot rule
Portable generators run outdoors only, 20+ feet from the home, exhaust pointed away from every opening, never in garages even with the door up. Install battery CO alarms on every level regardless. Standby units are engineered for outdoor pad placement with setbacks from openings enforced by code, which is part of what the permit inspection checks.
Backfeed: why the transfer switch is law
Plugging a generator into a wall outlet ('suicide cord') energizes the utility lines outside your home and can electrocute the line crew restoring your street. A transfer switch or interlock physically prevents it. There is no safe shortcut here.
Weather, fuel, and kids
Run portables under open canopies in rain, never enclosed; let engines cool before refueling (gasoline on hot exhaust is the fire pattern); store fuel in rated containers away from living space; and treat a running unit like the hot engine it is around children and pets. Standby units on natural gas erase the refueling risks entirely, which is quietly one of their biggest safety features.
Quick Answers
How far from the house does a standby generator sit?
Per manufacturer and code: typically 18 inches from the wall and 5 feet from windows, doors, and vents, verified at inspection. Your installing contractor sites it.
Do I need CO detectors with a standby unit?
Yes, on every level and near bedrooms, always, generator or not. Many portables now include CO auto-shutoff sensors; buy that feature.
Can a generator run during a hurricane?
Standby units run through storms; that's the job. Portables should not be operated in driving rain unprotected, another argument for automatic standby in hurricane states.