Generator Safety: Carbon Monoxide, Electrical & Storm Risks

Carbon monoxide is the immediate hazard

Fuel-burning engines and appliances can produce carbon monoxide. The CDC lists headache, dizziness, weakness, upset stomach, vomiting, chest pain, and confusion among common symptoms. People who are sleeping or unable to recognize symptoms may be at particular risk. Multiple people or pets feeling ill in the same space is an urgent warning, but symptoms are not required for an alarm to be taken seriously.

Portable and permanently installed generators have different placement instructions

Portable generator

CPSC guidance is to operate portable generators outdoors, at least 20 feet from homes and buildings, with exhaust directed away from windows, doors, and vents. Never operate one inside a home, garage, basement, crawlspace, shed, or other enclosed area—even if doors or windows are open. Follow the exact owner’s manual for additional limits, weather protection, and operation.

Permanently installed standby generator

Do not apply the portable-generator 20-foot distance as a fixed standby-generator clearance. For a permanently installed unit, the exact model’s current installation manual, installation listing, local code, permit authority, utility requirements, and site conditions govern. Have a qualified installer and the authority having jurisdiction confirm the planned location before work begins. See the standby placement guide for model-specific examples and limits.

Install and maintain CO alarms

CPSC recommends battery-operated CO alarms or alarms with battery backup on every level of the home and outside sleeping areas; interconnected alarms are preferable where practical. Follow the alarm manufacturer’s placement, test, battery, and end-of-life instructions. CPSC’s current storm-safety guidance says to test alarms monthly. Alarms are an additional layer, not permission to operate equipment unsafely.

Keep electrical connections within safe boundaries

• Never power home wiring by plugging a generator into a wall outlet (“backfeeding”). CPSC warns that this can endanger utility workers and neighbors and bypass household circuit protection.
• Use only the transfer equipment, generator connection, cords, and operating method approved for the exact equipment and intended use.
• Have home transfer equipment selected and installed by a qualified electrician; permit and licensing requirements vary by location.
• Follow the generator manual’s instructions about wet conditions and electrical-shock hazards. Do not touch electrical equipment while standing in water or if it is wet and energized.

Fuel, weather, and flood precautions

If you smell or hear gas leaking, leave the building immediately. Do not operate lights, phones, or other electronics before leaving; contact the gas utility or local gas authority from outside. Do not restart equipment after a suspected leak until the appropriate professionals say it is safe.

After flooding, CPSC says not to touch wet appliances that remain connected to electricity and to have a qualified professional or utility representative inspect affected equipment before use. Do not approach a flooded generator, panel, or fuel installation to shut it off. Follow local emergency instructions and contact the utility or qualified service provider.

For portable equipment during rain or snow, follow its manual and CPSC wet-weather warnings. Never use a cover or structure that places the unit inside or near an opening to an occupied building.

If a CO alarm sounds or someone feels ill

1. Move everyone outside to fresh air immediately. Do not try to locate the source first.
2. Call 911 or local emergency services from outside.
3. Account for everyone, including children and pets; tell responders about symptoms and possible CO exposure.
4. Do not re-enter until emergency responders say it is safe.
5. Seek prompt medical care for suspected exposure, and have fuel-burning equipment checked by a qualified service professional before reuse.

This is general safety information; emergency responders and medical professionals should guide the response to an actual incident.

Check recalls and keep the exact manual

Check the CPSC recall database for the exact product and model, register equipment where the manufacturer offers registration, and keep the current owner and installation manuals accessible. Do not rely on a general article or an older model-family manual for instructions that depend on the equipment installed at your property.