Após uma revisão adicional, parece que os receptáculos e chaves estão listados para uso com terminais de crimpagem. Portanto, esta instalação não seria uma violação da NEC 110.3 (B).
National Electrical Code 2014
Chapter 1 General
Article 110 Requirements for Electrical Installations
110.3 Examination, Identification, Installation, and Use of Equipment.
(B) Installation and Use. Listed or labeled equipment shall be installed and used in accordance with any instructions included in the listing or labeling.
2013 UL White Book
Receptacles (RTDV)
Receptacles for Plugs and Attachment Plugs (RTRT)
Terminals
Terminals of a receptacle are permitted for use with certified field-installed crimped-on wire connectors or an assembly, if so identified by the manufacturer.A receptacle may also be provided with conductor leads with factory-installed crimped-on connectors. Such connectors may be either attached to the receptacle terminal or are provided with the receptacle in the smallest unit shipping container and are suitable for use with the terminal of the receptacle.
Switches (WFXV)
Snap Switches (WJQR)
Terminals
Terminals of a flush snap switch are permitted for use with Listed field-installed crimped-on wire connectors or an assembly, if so identified by the manufacturer.A flush snap switch may also be provided with conductor leads with factory-installed crimped-on connectors. Such connectors may be either attached to the flush snap switch terminal or are provided with the flush snap switch in the smallest unit shipping container and are suitable for use with the terminal of the flush snap switch.