Transfer Switches
A generator transfer switch closes off the utility power line to your home’s electrical system during a power outage and opens a line to a generator, then reverses the process when grid power is restored. Permanently hard-wired to and installed near the breaker panel in your home, transfer switches solve the problem of backfeeding, which occurs when electricity runs backward out of the house and through the utility transformer.
Per the National Electrical Code (NEC), all transfer switches must have a three-position LINE-OFF-GENERATOR or ON-OFF-ON switch to keep power from accidentally backfeeding. The three-position switch ensures that the switch goes through the off position when traveling from the generator position to the line position, fully disconnecting the generator every time before the main utility switch is turned on. To learn more about generators, see our Generators Buying Guide.
A transfer switch has to be installed by a licensed electrician. |
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FAQ'S
Factors to Consider
There are two types of transfer switch: manual and automatic
Manual transfer switches are hardwired to your control panel and used to power portable or "home owner" generators. Manual switches must be manually turned on and off when the electricity goes out or comes back on, which can be a problem if you are not home during a power outage. The switch is wired to ONLY the essential circuits in your home, such as lights and furnace blowers that can’t be run with an extension cord.
Automatic transfer switches automatically turn the generator on and switch power to it when they detect a drop in line voltage and turn the generator off when they sense the line power is restored. Automatic transfer switches can be used with portable generators as long as the generator has an electric starter. They are most often used with automatic standby generators or permanently installed generators.
Options
Transfer switches come in a variety of configurations, and the experts at Suggs Electrical will make sure you get the right unit for your needs.
Typically installed on an outside wall, as close to the main breaker panel as possible.
Maintenance and testing must be done on a regular basis, consult your transfer switch manual for manufacturer’s recommendations, so you can be sure your generator will work properly every time it is needed.
Q: Are portable generators safe?
A: Only if installed and operated properly.
- Observe the generator manufacturer's instructions for safe operation.
- Plug individual appliances into the generator using heavy duty, outdoor rated cords with a wire gauge adequate for the appliance load.
- Never plug the generator into a wall outlet.
- If connecting to the house wiring is necessary to operate a well pump, sump pump, furnace or other hard-wired equipment, have a qualified electrician, like Suggs Electrical, install a manual transfer switch to prevent backfeed into our lines.
- The switch protects our workers and the public from getting injured by your power supply, and it prevents damage to your generator, wiring and appliances when power is restored.
- To prevent carbon monoxide poisoning, never use a generator indoors. Only operate a generator outdoors in a well-ventilated, dry area, away from air intakes to the home, and protected from direct exposure to rain and snow, preferably under a canopy, open shed, or carport.
- To usel a portable generator requires a generator transfer switch like pictured below. With this type of panel you can switch some of your homes circuit off of the power grid and then power them from a local portable generator.
