Revenue grade refers to the high level of accuracy required for metering devices used in billing and financial transactions like tenant billing. Achieving system accuracy relies on the precision of both the meter and the current transformer (CT).
The DENT PowerScout HD line of submeters is held to an exceptionally high accuracy standard, with an error of less than 0.2% across all models.
Finding revenue-grade CTs can be challenging due to ambiguous testing. At DENT, we address this by setting our own high standards for what “revenue grade” means, rigorously testing CTs against IEEE C57.13 Class 0.3 or Class 0.6 specifications to ensure they meet the expectations for billing applications. IEEE C57.13 compliance does NOT, however, necessarily mean that a CT meets the stringent testing requirements for ANSI C12.20.
ANSI C12.20 mandates that the meter and CT must be tested together as a system with a combined error of less than 0.5%. Only CTs with the highest repeatable accuracy are selected for these tests. Some municipal bodies such as California’s CTEP or New York’s PSC require ANSI C12.20 certification to be considered for their “approved submeter” lists.
