{
  "url": "https://openlegislation.uk/eu-regulation-2017-1485/article-25",
  "json_url": "https://openlegislation.uk/eu-regulation-2017-1485/article-25.json",
  "legislation": "eur/2017/1485",
  "legislation_title": "Commission Regulation (EU) 2017/1485 of 2 August 2017 establishing a guideline on electricity transmission system operation (Text with EEA relevance)",
  "legislation_url": "https://openlegislation.uk/eu-regulation-2017-1485",
  "path": "article/25",
  "kind": "article",
  "number": "25",
  "heading": "Operational security limits",
  "text": "1. Each TSO shall specify the operational security limits for each element of its transmission system, taking into account at least the following physical characteristics:\n(a) voltage limits in accordance with Article 27;\n(b) short-circuit current limits according to Article 30; and\n(c) current limits in terms of thermal rating including the transitory admissible overloads.\n2. When defining the operational security limits, each TSO shall take into account the capabilities of SGUs to prevent that voltage ranges and frequency limits in normal and alert states lead to their disconnection.\n3. In case of changes of one of its transmission system elements, each TSO shall validate and where necessary update the operational security limits.\n4. For each interconnector each TSO shall , where applicable, endeavour to agree with the neighbouring TSO on common operational security limits in accordance with paragraph 1.",
  "extent": "E+W+S+N.I.",
  "status": null,
  "version": "current",
  "annotations": [
    {
      "type": "F",
      "label": "F1",
      "text": "Words in Art. 25(4) inserted (E.W.S.) (31.12.2020) by The Electricity Network Codes and Guidelines (System Operation and Connection) (Amendment etc.) (EU Exit) Regulations 2019 (S.I. 2019/533), reg. 1(2), Sch. 1 para. 25 (as amended by S.I. 2020/1016, regs. 1(2), 6(2)); 2020 c. 1, Sch. 5 para. 1(1)"
    }
  ],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/eur/2017/1485/article/25",
    "retrieved_at": "2026-11-01T14:44:42.168103+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."
}