Electricity metering in compliance with calibration law has become increasingly relevant, not least due to the new Energy Collection Act. In recent weeks, we have been receiving a steady stream of customer inquiries about electricity metering in compliance with calibration law and the associated requirements. This type of metering is required by the authorities in certain constellations, which are characterized by a special obligation to provide evidence and accountability. For example, it is required when measuring electricity by means of a meter that complies with calibration law for electricity quantities that are passed on to third parties and are subject to a surcharge. The required conversion and billing takes place accordingly. But does a measuring device comply with calibration law?
A general answer to this question, which applies to all federal states, is difficult to formulate here. The right contacts for private households and companies are the responsible measuring and calibration authorities of the federal states. The BAFA also makes this clear in its electricity meter information sheet and also points out that non-compliant metering of electrical energy is classified as an administrative offense and is punishable by heavy fines imposed by the responsible metering and calibration authorities.
Nevertheless, it can be stated that a measurement that complies with calibration law always consistsof a conformity-rated plug-in transformer and an MID electricity meter. MID is an abbreviation for the "Measuring Instruments Directive". This refers to the "Directive 2004/22/EC of the European Parliament and of the Council of March 31, 2004 on measuring instruments". If one of the two components is not conformity assessed in accordance with MID, the measuring point may also not comply with calibration law. Only in special exceptional cases is it possible to be exempted from measurement in conformity with calibration law. However, the possibility of this exemption must be clarified with the responsible verification authority in each individual case. As a rule, a conformity assessment for current transformers does not expire. In the case of electricity meters, this must be renewed after eight years. Current transformers are exclusively plug-in transformers which, in contrast to the widely used hinged transformers, must be installed with increased effort.
A current measurement that complies with calibration law always consists of a conformity-rated current transformer and an MID electricity meter.
In certain situations, a so-called differential measurement appears to make sense. Differential measurement refers to the determination of a quantity of electricity that is determined by subtracting several other quantities of electricity. There is currently no clarity as to whether this procedure leads to a measurement that complies with calibration law and it should always be checked with the responsible measurement and calibration authorities. You can find an overview of the responsible authorities in the federal states here: https: //www.eichamt.de/
The following can therefore be said about the question posed at the beginning:
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