HouseChalk
Transfer switch
A transfer switch is a device that safely switches a home's electrical supply between utility power and generator power.
Why it matters
It prevents backfeeding electricity into the utility grid during an outage, which can injure line workers and damage equipment.
Where people get this wrong
A transfer switch is required by code when connecting any generator to the home's wiring. Plugging a generator into an outlet without one is illegal and dangerous.
Real-world example
The electrician installs a transfer switch next to the main panel. During an outage, it isolates the house from the grid before the generator feeds power to selected circuits.
Where this hits your build
This matters during rough-in and before drywall. Once walls close, adding or moving wiring becomes expensive. Plan ahead.
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