{
  "url": "https://openlegislation.uk/road-vehicles-construction-and-use-regulations-1986/schedule-5A/paragraph-5",
  "json_url": "https://openlegislation.uk/road-vehicles-construction-and-use-regulations-1986/schedule-5A/paragraph-5.json",
  "legislation": "uksi/1986/1078",
  "legislation_title": "The Road Vehicles (Construction and Use) Regulations 1986",
  "legislation_url": "https://openlegislation.uk/road-vehicles-construction-and-use-regulations-1986",
  "path": "schedule/5A/paragraph/5",
  "kind": "paragraph",
  "number": "5",
  "heading": "Discharge from other pressure relief devices",
  "text": "(1) The hydrogen gas discharge from other pressure relief devices that are not thermally-activated, including burst discs, must not be directed—\n(a) towards exposed electrical terminals, exposed electrical switches or other ignition sources;\n(b) into or towards the passenger compartment;\n(c) into or towards any vehicle wheel housing;\n(d) towards each container.\n(2) At the hydrogen-fuelled vehicle exhaust system’s point of discharge, the hydrogen concentration level must not exceed—\n(a) 4.0% average by volume during any moving three-second time interval during normal operation, including start-up and shut-down;\n(b) 8.0% at any time.\n(3) The test procedure that must be followed, for determining the hydrogen concentration level in sub-paragraph (2), is the compliance test for the vehicle exhaust system in paragraph 4 of Annex 5 to ECE Regulation 134.02.",
  "extent": null,
  "status": null,
  "version": "current",
  "annotations": [
    {
      "type": "F",
      "label": "F1",
      "text": "Sch. 5A inserted (29.4.2025) by The Road Vehicles (Construction and Use) (Amendment) Regulations 2025 (S.I. 2025/454), regs. 1(1), 2(4)"
    }
  ],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/uksi/1986/1078/schedule/5A/paragraph/5",
    "retrieved_at": "2026-10-29T16:46:09.046037+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."
}