Electric Generator Safety
Guidelines to Make Sure Your Generator Works Safely
Some customers prepare for the possibility of power outages by buying an electric generator as a standby system to keep lights and appliances running until service is restored.
A generator may be able to keep your business running or power other essential equipment. Generators can be expensive and noisy. They can also pose serious safety hazards to you and to others, so please follow all safety instructions provided by the manufacturer.
The law requires that customers with a permanently installed or portable generator do not connect it to another power source, such as PG&E's power lines. If you own and operate a generator, you are responsible for making sure that electricity from your unit cannot "backfeed" or flow into PG&E's power lines. For safety's sake, be sure to use your generator correctly. If you do not, you risk damaging your property and endangering your life and the lives of PG&E line workers who may be working on power lines some distance from your facility.
Permanent Standby Generators
When a generator is permanently connected to a customer's electric system, it energizes the building's wiring. This type of installation requires a device that prevents the generator from being connected to PG&E's power lines. Only a qualified professional, such as a licensed electric contractor, should install a permanent standby generator.
- A double-pole, double-throw transfer switch (see diagram) is the recommended device to keep your generator from backfeeding into PG&E's system. The switch also keeps PG&E's power from re-energizing your building’s wiring while your generator is running—protecting your generator, wiring and electrical equipment from damage when your service is restored.
- Have all additions to your building’s wiring inspected by your city or county building department.
- When installation is complete, call PG&E to let us know about your back-up system. We will make a note in our records to remind our workers of your generator if they are working on an outage in your area. In some cases, PG&E line workers may ask to check your electric generator transfer switch for safety.
- If you already have a permanently installed standby generator but don't know if it's installed properly, call your local building inspector or a licensed contractor for help.
You are responsible for any injuries or damage to your property, your neighbors' or PG&E's, from an improperly installed or operated generator.
Portable generators are designed to be connected only to selected equipment. These generators never should be connected directly to a building's wiring system.
- Before starting your generator, carefully read and follow all of the manufacturer's instructions.
- Be sure that the total electric load on your generator won't exceed the manufacturer's rating.
- Always locate your generator where its exhaust will vent safely.
- Prioritize your needs. Use the lowest wattage light bulbs that provide a safe level of light, reserving power for additional lighting elsewhere or a small appliance. Remember that the greater the load on your generator, the more fuel it will use.
- Keep cords out of the way so they don't present a tripping hazard—especially in dimly lit doorways or halls. Never run cords under rugs or carpets where heat might build up or damage to a cord may go unnoticed.
Extension cords must be properly sized to carry the electric load. Overloaded cords can overheat and cause fires or damage to equipment.
Download a printable generator safety guidelines (PDF, 348 KB).