What Is Backfeeding?
Backfeeding is the flow of electricity into a circuit or system from a source other than its usual supply. In a home generator setup, that source may send power toward the electrical panel and utility lines. This unexpected flow can create a shock hazard for anyone working on the lines.
Quick Facts About Backfeeding
- Category
- Electrical power flow
- Used for
- Describing power entering a system from an alternate source
- Common confusion
- Controlled generator supply versus unintended power flow
- Also called
- Electrical Backfeed, Backfeed
- Often discussed with
- Generator Installation
Key Takeaways About Backfeeding
- Power can travel toward utility lines during an outage.
- A transfer switch controls the connection between power sources.
- Generator backup power isn't always unsafe backfeeding.
How Backfeeding Works
Backfeeding occurs when an alternate source energizes wiring connected to the usual supply path. During an outage, a generator can supply a home's electrical panel. If the panel remains connected to utility lines, generator power can reach those lines.
Related glossary terms: Transfer Switch, Electrical Panel, Branch Circuit.
A transfer switch changes the home's connection between utility power and generator power. It separates the sources while allowing the generator to serve selected circuits. An interlock is another device that controls which source connects to the panel.
The direction of power flow depends on the wiring and the source connections. A generator connected through an outlet can send power into wiring that normally supplies the outlet. That path differs from a planned generator connection that controls the source supplying the panel.
From the GMB Electric team
When we plan a generator installation, we check how the panel connects to utility power. We also look at the circuits your generator will supply. The transfer equipment and panel arrangement determine how those circuits receive backup power.
Backfeeding in Practice: A Real-World Example
A homeowner wants a generator to power the refrigerator during an outage. The installation connects the generator through transfer equipment so the refrigerator circuit can receive backup power without energizing the utility lines.
Related Services
Related Terms
Transfer Switch
A transfer switch is an electrical device that connects a building's wiring to a selected power source.
Electrical Panel
An electrical panel is a metal enclosure that distributes electricity to circuits throughout a building.
Branch Circuit
A branch circuit is a section of electrical wiring that carries power from a circuit breaker or fuse to outlets, lights, or equipment.
Electrical Load
An electrical load is the demand placed on an electrical system by equipment that uses power.
GMB Electric
Have Questions About Backfeeding?
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