{
  "url": "https://openlegislation.uk/measuring-instruments-regulations-2016/schedule-1E/paragraph-3",
  "json_url": "https://openlegislation.uk/measuring-instruments-regulations-2016/schedule-1E/paragraph-3.json",
  "legislation": "uksi/2016/1153",
  "legislation_title": "The Measuring Instruments Regulations 2016",
  "legislation_url": "https://openlegislation.uk/measuring-instruments-regulations-2016",
  "path": "schedule/1E/paragraph/3",
  "kind": "paragraph",
  "number": "3",
  "heading": "MPEs",
  "text": "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:\nWhen the meter is operating under varying-load current, the percentage errors shall not exceed the limits given in Table 2.\nTable 2\nOperating temperatures\nOperating temperatures\nOperating temperatures\nOperating temperatures\nMPEs in percent at rated operating conditions and defined load current levels and operating temperature\nOperating temperatures\nOperating temperatures\nOperating temperatures\nOperating temperatures\n+ 5 °C … + 30 °C\n– 10 °C … + 5 °C\nor\n+ 30 °C … + 40 °C\n– 25 °C … – 10 °C\nor\n+ 40 °C … + 55 °C\n– 40 °C … – 25 °C\nor\n+ 55 °C … + 70 °C\nMeter class\nA\nB\nC\nA\nB\nC\nA\nB\nC\nA\nB\nC\nSingle phase meter; polyphase meter if operating with balanced loads\nImin ≤ I < Itr\n3.5\n2\n1\n5\n2.5\n1.3\n7\n3.5\n1.7\n9\n4\n2\nItr ≤ I < Imax\n3.5\n2\n0\n4.5\n2.5\n1\n7\n3.5\n1.3\n9\n4\n1.5\nPolyphase meter if operating with single phase load\nItr ≤ I < Imax\n, see exception below\n4\n2.5\n1\n5\n3\n1.3\n7\n4\n1.7\n9\n4.5\n2\nFor electromechanical polyphase meters the current range for single-phase load is limited to 5Itr ≤ I ≤ Imax\nWhen a meter operates in different temperature ranges the relevant MPE values shall apply.\nThe meter shall not exploit the MPEs or systematically favour any party.",
  "extent": null,
  "status": null,
  "version": "current",
  "annotations": [
    {
      "type": "F",
      "label": "F1",
      "text": "Schs. 1A-1K inserted (E.W.S.) (31.12.2020) by The Product Safety and Metrology etc. (Amendment etc.) (EU Exit) Regulations 2019 (S.I. 2019/696), reg. 1, Sch. 27 para. 49 (with Sch. 27 para. 50(a)) (as amended by S.I. 2020/676, regs. 1(1), 2); 2020 c. 1, Sch. 5 para. 1(1)"
    }
  ],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/uksi/2016/1153/schedule/1E/paragraph/3",
    "retrieved_at": "2026-10-28T23:17:40.726189+00:00"
  },
  "licence": "Open Government Licence v3.0",
  "licence_url": "https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/",
  "attribution": "Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives."
}