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Automatic transfer switch
An automatic transfer switch detects a power outage and activates a backup generator without anyone flipping a switch.
Why it matters
It restores power in seconds during an outage, protecting sump pumps, refrigerators, and medical equipment.
Where people get this wrong
An automatic transfer switch is not the generator itself. It is the switching device between utility power and generator power.
Real-world example
The power goes out at 2 a.m. The automatic transfer switch senses the loss, starts the standby generator, and your house has power again in under 30 seconds.
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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