New for 2017 – Receptacles with Built-in USB chargers. NEC 2017 406.3

Prior to the 2017 edition of the NEC, 120-volt receptacles equipped with USB charging outlets had not been addressed by the National Electrical Code.
Universal Serial Bus (USB) connections have been around since the 1990s and are widely used to charge portable devices and computer peripherals, as well as transfer data.