Provides requirements and guidance on electricity metering, watthour meter sockets, device data tables, meter interfacing to data communication networks and type 2 optical ports. Also establishes performance criteria for thermal demand meters, mechanical demand registers and phase-shifting devices used in metering. Test methods for transformer-rated meters and self-contained "A" base watthour meters are included in this package, as is a watthour safety standard. This package includes the following: C12.19-2012 American National Standard for Utility Industry End Device Data Tables C12.22-2012 American National Standard for Protocol Specification for Interfacing to Data Communication Networks C12.1-2014 American National Standard for Electric Meters - Code for Electricity Metering C12.20-2015 American National Standard for Electricity Meters - 0.1, 0.2, and 0.5 Accuracy Classes SG-AMI 1-2009 (R2015) Requirements for Smart Meter Upgradeability C12.11-2007 American National Standard for Instrument Transformers for Revenue Metering, 10 kV BIL Through 350 kV BIL (0.6 kV NSV through 69 kV NSV) C12.18-2006 (R2016) American National Standard for Protocol Specification for ANSI Type 2 Optical Port C12.21-2006 (R2016) Protocol Specification for Telephone Modem Communication C12.4-1984 (R2011) American National Standard for Registers, Mechanical Demand C12.7-2014 American National Standard for Requirements for Watthour Meter Sockets C12.8-1981 (R2012) Test Blocks and Cabinets for Installation of Self-Contatained "A" Base Watthour Meters C12.9-2014 American National Standard for Test Switches and Plugs for Transformer-Rated Meters C12.5-1978 (R2002, R2012) American National Standard for Thermal Demand Meters C12.6-1987 (R2016) American National Standard for Phase-Shifting Devices Used In Metering, Marking and Arrangement of Terminals C12.10-2011 American National Standard for Physical Aspects of Watthour Meters-Safety Standard