Tamper-Resistant Receptacle
A receptacle with built-in shutters that prevent the insertion of foreign objects into the contact openings, required in dwelling units to protect children.
Detailed Explanation
NEC 406.12 requires tamper-resistant (TR) receptacles in all areas of dwelling units. The internal spring-loaded shutters only open when equal pressure is applied to both slots simultaneously (as when inserting a plug). Single-prong objects like hairpins or keys cannot open the shutters. TR receptacles are identified by the letters 'TR' stamped between the slots. This requirement was added to prevent approximately 2,400 child injuries from electrical outlets that occur annually in the US.
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