Home backup buying and ownership
Generator safety
The short answer
Generator safety: Use a portable engine generator outdoors only. Keep it at least 20 feet from the home, with exhaust pointed away. Never run it indoors or in a garage, even with doors open. Shut it down and let it cool before refueling. Never backfeed a wall outlet. Follow the exact manual for battery stations and standby systems. Local rules also apply to standby systems.
Last updated October 2026
What's covered7
This generator safety checklist covers the main risks of home use. Carbon monoxide can kill. Wet hands and live wires can cause shock. Hot fuel can catch fire. Where you place the unit matters too. Engine units, battery stations and standby systems each have their own rules.
Run a portable engine generator outdoors only, at least 20 feet from the home, with exhaust pointed away. Never run it indoors or in a garage, even with doors open. Shut it down and let it cool before refueling. Never plug it into a wall outlet. Battery stations and standby systems follow their own manuals and local rules.
Generator safety rules by type
| Check | Portable engine | Battery power station | Standby system |
|---|---|---|---|
| Placement | Outdoors, at least 20 feet from the home, exhaust away | Follow the exact product manual | Follow the exact installation manual and local rules |
| Indoors or garage | Never, even with doors open | Follow the exact product manual | Not covered by the portable rule |
| Refueling | Shut down and cool first | No fuel; follow the manual for charging | Not covered here |
| Home connection | Approved transfer equipment, never a wall outlet | Follow the exact product manual | Installed by licensed trades |
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Carbon monoxide and placement
CPSC says to use portable engine generators outdoors. Keep them at least 20 feet from the home. Point the exhaust away from the house (CPSC).
Never run one indoors or in a garage. Open garage doors do not make it safe. Install carbon monoxide alarms in the home. If an alarm sounds or symptoms appear, get to fresh air right away (CPSC safety alert).
An auto start feature does not change this. An engine unit must still run in a safe spot outdoors.
Electrocution and backfeeding
Never plug a generator into a wall outlet. CPSC warns against this practice, which is called backfeeding.
Transfer gear keeps grid power and generator power apart. The generator, switch, inlet, panel and circuits must all match. An interlock must be listed and accepted for the exact panel and local rules. A basic adapter cannot create a voltage the generator does not supply (Generac).
A kit may not fit your setup. For example, the Reliance 306CRK includes a six-circuit 30 A switch, an inlet and a cord. Installation and service belong to licensed electrical trades. Do not modify wiring, gas lines or neutral connections yourself.
Refueling and wet weather
Shut the generator down before refueling. Let it cool first. Never refuel a hot engine. Store gasoline in approved fuel containers, outside living areas and away from any flame, pilot light or other ignition source. Keep propane cylinders upright and outdoors.
Run it on a dry surface. CPSC describes an open, canopy-like structure for cover. Follow the maker's exact rules for operating in rain. Never touch a generator with wet hands (CPSC safety alert).
For step-by-step outage use, see how to use a generator during a power outage.
Sources, method and limitations
This checklist uses CPSC advice and the makers' own guides.
It does not set standby clearances. Those come from each unit's installation manual and local rules. It also does not give indoor rules for battery stations. Read your exact model's manual, because guidance can change.
Generator safety FAQs
How far should a portable generator be from my house?
CPSC says to keep a portable engine generator outdoors, at least 20 feet from the home. Point the exhaust away from the house. This distance applies to portable engines. Standby systems use their own installation manual and local clearance rules instead.
Can I run a generator in my garage with the door open?
No. CPSC says never to run a portable engine generator indoors or in a garage. Open doors do not make a garage safe. Move it outdoors, at least 20 feet from the home, with exhaust pointed away.
Keep working carbon monoxide alarms inside.
Is it safe to plug a generator into a wall outlet?
No. CPSC warns never to backfeed through a wall outlet. A home connection needs transfer equipment that keeps utility and generator power apart. The generator, switch, inlet and panel must match.
Licensed electrical trades should handle installation under local rules.
Can I use a battery power station indoors?
The portable engine rule covers fuel-burning generators. Battery power stations store energy instead of burning fuel. This checklist does not set indoor rules for them. Read your exact model's manual for placement, charging and use limits.
Follow those instructions before using one indoors.
Primary documents
- CPSC portable engine generator placement
- Reliance Controls six-circuit transfer kit
- CPSC generator dry-surface and refueling safety
- Generac home connection safety
Generator safety Verdict
Generator safety: For a portable engine, stay outdoors and at least 20 feet from the home. Point the exhaust away. Never backfeed an outlet, and never refuel while hot. For a battery station or standby system, follow its exact manual and local rules.