This piece was originally published in the March 2016 issue of ei, the magazine of the electroindustry.
By Paul Orr, Program Manager, NEMA
Presently, on the Caribbean Island of Dominica, consumers of electricity are faced with high electricity costs resulting from high fuel-surcharge payments. This has led to high prices of commodities and services produced on the island. In response, Mara Abraham of the Dominica Bureau of Standards (DBOS) informed NEMA that it was tasked with developing a standard to address trade issues related to meter accuracy and acceptable performance of new types of electricity metering devices and associated equipment.
The mission of the DBOS is to improve the global competitiveness of Dominican goods and services and enhance the overall quality of life of the citizenry of the Commonwealth of Dominica through the promotion and maintenance of standards and standards-related activities.
The DBOS found that NEMA’s ANSI C12.1 Code for Electricity Metering met its need to address trade issues related to meter accuracy and acceptable performance of new types of electricity metering devices and associated equipment. The DBOS asked to adopt this standard.
ANSI C12.1 is a good fit. It is in compliance with Dominica’s sole producer of electricity, Dominica Electricity Services Ltd, and its electricity meters and proposed meter test console. ANSI C12.1 is also being used in Grenada and Guyana.
After further discussion with me (as secretary of the ANSI C12 Electricity Metering Accredited Standards Committee), The DBOS reviewed and adopted ANSI C12.20 American National Standard for Electricity Meters—0.2 and 0.5 Accuracy Classes.
Ms. Abraham noted that Dominica adopted the ANSI C12 standards to bring equity to the industry as it relates to service providers and consumers. The standards are expected to improve the quality of kilowatt-hour metering instruments.
ANSI C12.1-2008 establishes acceptable performance criteria for new types of AC watthour meters, demand meters, demand registers, pulse devices, and auxiliary devices. It describes acceptable in-service performance levels for meters and devices used in revenue metering. It also includes information on related subjects, such as recommended measurement standards, installation requirements, test methods, and test schedules. This code is designed as a reference for those concerned with the art of electricity metering, such as utilities, manufacturers, and regulatory bodies.
ANSI C12.20-2010 establishes the physical aspects and acceptable performance criteria for 0.2 and 0.5 accuracy class electricity meters meeting Blondel’s Theorem, which specifies the minimum number of watt-hour meters required to measure the consumption of energy in any system of electrical conductors. Where differences exist between the requirements of this standard and those of C12.1 and C12.10, the requirements of ANSI C12.20 prevail.
NEMA anticipates that new revisions to ANSI C12.1 and ANSI C12.20 will be published this year.
For more information on ANSI C12 standards or to get involved on the C12 Standards Committee, contact Paul Orr. For information on the DBOS, contact Mara P. Abraham, Technical Officer Standards Development, DBOS (firstname.lastname@example.org).