{
  "url": "https://openlegislation.uk/road-vehicles-construction-and-use-regulations-1986/schedule-5A/paragraph-6",
  "json_url": "https://openlegislation.uk/road-vehicles-construction-and-use-regulations-1986/schedule-5A/paragraph-6.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/6",
  "kind": "paragraph",
  "number": "6",
  "heading": "Protection against flammable conditions",
  "text": "(1) Hydrogen leakage and permeation from the compressed hydrogen storage system must not directly vent into the passenger compartment, or into any enclosed or semi-enclosed spaces within the hydrogen-fuelled vehicle that contain unprotected ignition sources.\n(2) Any single failure downstream of the main hydrogen shut-off valve must not result in accumulations in levels of hydrogen concentration in the passenger compartment.\n(3) The requirement in sub-paragraph (2) is met if the hydrogen concentration in the passenger compartment does not exceed 1.0% by volume when tested in accordance with sub-paragraph (4).\n(4) The test procedure for determining levels of hydrogen concentration in sub-paragraph (2) is the test procedure for integrity of enclosed spaces and detection systems in paragraph 3.2 of Annex 5 to ECE Regulation 134.02.\n(5) If, during operation, the hydrogen concentration exceeds 3.0% by volume in the air in the enclosed or semi-enclosed spaces of the hydrogen-fuelled vehicle, a warning must be provided in accordance with paragraph 7.\n(6) If, during operation, the hydrogen concentration exceeds 4.0% by volume in the air in the enclosed or semi-enclosed spaces of the hydrogen-fuelled vehicle, the main shut-off valve must be closed to isolate the compressed hydrogen storage system.",
  "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/6",
    "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."
}