3. MPEs

Directive 2014/32/EU of the European Parliament and of the Council of 26 February 2014 on the harmonisation of the laws of the Member States relating to the making available on the market of measuring instruments (recast) Text with EEA relevance · European Union

The effects of the various measurands and influence quantities (a, b, c,…) are evaluated separately, all other measurands and influence quantities being kept relatively constant at their reference values. The error of measurement, that shall not exceed the MPE stated in Table 2, is calculated as: Error of measurement(a2 b2 c2 …) When the meter is operating under varying-load current, the percentage errors shall not exceed the limits given in Table 2. Table 2 MPEs in percent at rated operating conditions and defined load current levels and operating temperature Operating temperatures Operating temperatures Operating temperatures Operating temperatures + 5 °C … + 30 °C – 10 °C … + 5 °C or + 30 °C … + 40 °C – 25 °C … – 10 °C or + 40 °C … + 55 °C – 40 °C … – 25 °C or + 55 °C … + 70 °C Meter class A B C A B C A B C A B C Single phase meter; polyphase meter if operating with balanced loads I_(min)II_(tr) 3,5 2 1 5 2,5 1,3 7 3,5 1,7 9 4 2 I_(tr)II_(max) 3,5 2 0,7 4,5 2,5 1 7 3,5 1,3 9 4 1,5 Polyphase meter if operating with single phase load I_(tr)II_(max), see exception below 4 2,5 1 5 3 1,3 7 4 1,7 9 4,5 2 For electromechanical polyphase meters the current range for single-phase load is limited to 5I_(tr)II_(max) When a meter operates in different temperature ranges the relevant MPE values shall apply. The meter shall not exploit the MPEs or systematically favour any party.

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Source: EUR-Lex (Cellar) · retrieved 2026-11-06 · Text as adopted (Official Journal); later amendments are not incorporated in this text.