# The Road Vehicles (Construction and Use) Regulations 1986, Paragraph 9: Additional installation requirements


(1) Each container must be mounted in a position that is between two vertical planes that are located perpendicular to the centre line of the hydrogen-fuelled vehicle.
(2) The two vertical planes referred to in sub-paragraph (1) must be located at least—
(a) 200 mm rearward from the front edge of the hydrogen-fuelled vehicle, and
(b) 200 mm forward of the rear edge of the hydrogen-fuelled vehicle.
(3) Each container must be mounted in a position that is between the two vertical planes that are parallel to the centre line of the hydrogen-fuelled vehicle.
(4) The two vertical planes referred to in sub-paragraph (3) must be located at least 200 mm inside from the outermost edges of the hydrogen-fuelled vehicle in the proximity of each container.
(5) A hydrogen-fuelled vehicle that does not comply with sub-paragraphs (3) and (4) may still be considered compliant with the requirements of this paragraph if it has passed the lateral impact test specified in paragraph 7.2.4.3 of ECE Regulation 134.02.
(6) For the purposes of sub-paragraph (5)—
(a) the lateral impact test must be conducted by a Technical Service that is responsible for conducting approval tests and that has been communicated to the United Nations secretariat in accordance with paragraph 12 of ECE Regulation 134.02;
(b) the requirement for the compressed hydrogen storage system to be filled with hydrogen or helium in paragraph 1 of Part 1 or paragraph 1 of Part 2 of Annex 8 to ECE Regulation 134.02 does not need to be met if the following criteria are met instead—
(i) the compressed hydrogen storage system is empty or filled with an inert gas to a pressure below or equal to 20 bar for the purposes of the lateral impact test,
(ii) after the lateral impact test, any inert gas is removed and the compressed hydrogen storage system is repressurised to nominal working pressure with hydrogen or helium, before the Technical Service tests hydrogen gas leakage in accordance with paragraph 7.2.1 of ECE Regulation 134.02, and
(iii) for the purposes of sub-paragraph (ii), the time interval for starting measurement of hydrogen gas leakage is after the compressed hydrogen storage system has been repressurised with hydrogen or helium;
(c) demonstration of compliance through the calculation method described in paragraph 7.2.4.3 of ECE Regulation 134.02 is not permitted as an alternative to the lateral impact test.

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Source: https://www.legislation.gov.uk/uksi/1986/1078/schedule/5A/paragraph/9 (the official version)
Page: https://openlegislation.uk/road-vehicles-construction-and-use-regulations-1986/schedule-5A/paragraph-9
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.