Tamper-Resistant (TR) Outlet
An outlet with internal spring shutters that open only when both slots are pushed simultaneously by a plug, blocking the classic child-with-a-paperclip injury. Required by code in homes since 2008.
The shutters defeat single-object insertion: a key or pin in one slot meets a closed door, while a real plug's two blades open both shutters together. The CPSC counted thousands of child shock injuries per year from outlet insertions before TR became standard; plastic outlet caps, the old answer, turn out to be a choking hazard that children can remove.
TR outlets are identifiable by the "TR" stamp between the slots and the slight extra push they need (brand-new units can feel stiff, which is normal and loosens). Any outlet replacement in a dwelling is required to use TR types now, so older homes upgrade automatically as devices wear out.
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- NEMA 14-50 : The heavy 240-volt, 50-amp receptacle used for ranges, RV hookups and plug-in EV charging: four slots, rated for the most power a standard residential outlet delivers.
- Dedicated Circuit : A circuit serving exactly one appliance, with its own breaker and nothing else sharing the wire.
- Three-Way Switch : A switch pair controlling one light from two locations, like both ends of a hallway or stairs.
- Dimmer Switch : A switch that varies light brightness by chopping the AC waveform.