Tamper Resistant Duplex Receptacles provide compliance with 2011 NEC Article 406.12 that states that all receptacles installed in dwelling units must be tamper resistant. Durable impact-resistant thermoplastic face and back body is virtually unbreakable. "TR" designation provides visual identification. Terminal screws are backed out and ready to wire. Extra-long and extra-wide mounting straps with patented built-in wire stripper for #14 and #12 wire to speed installation. Side-wire terminals accept up to #10 solid or stranded wire and push-in terminals accept #14 solid wire.