{
  "url": "https://openlegislation.uk/lawnmowers-harmonization-of-noise-emission-standards-regulations-1992/schedule-3/paragraph-8.6.2",
  "json_url": "https://openlegislation.uk/lawnmowers-harmonization-of-noise-emission-standards-regulations-1992/schedule-3/paragraph-8.6.2.json",
  "legislation": "uksi/1992/168",
  "legislation_title": "The Lawnmowers (Harmonization of Noise Emission Standards) Regulations 1992",
  "legislation_url": "https://openlegislation.uk/lawnmowers-harmonization-of-noise-emission-standards-regulations-1992",
  "path": "schedule/3/paragraph/8.6.2",
  "kind": "paragraph",
  "number": "8.6.2",
  "heading": "Acoustic properties of test area",
  "text": "The constant C, which indicates the acoustic properties of the test area, is determined by the following equation:\nC=LWAr-LWAs where:\nLWAr = nominal sound power level of the reference source, expressed in dB;\nLWAs = sound power level of the reference source, calculated on the basis of measurements made on the test area, account being taken of 7.1((a), (b) and (c)).\nIf the ground surface of the test area is rigid and made of concrete or non-porous asphalt and if there are no reflecting objects on the measuring site, there is no need to determine any environmental constant C.\nIn the case of a partially reflecting ground surface, the value of C must be between limit values laid down below. The effective value of C, which indicates the acoustic properties of the measuring site used, is determined by the above equation.\nThis value is used as K2 for fixing the sound power level of the source.\nFurther corrections relating to the operation of the sound source (e.g. the altitude of the measuring site) should also be made.\nFor lawnmowers the constant C determined in accordance with this section shall be between 0.5 and 2 dB. Then K2 is put equal to zero in the equation in Section 8.5.",
  "extent": null,
  "status": null,
  "version": "current",
  "annotations": [],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/uksi/1992/168/schedule/3/paragraph/8.6.2",
    "retrieved_at": "2026-10-29T14:30:19.442341+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."
}