# Directive 2009/142/EC of the European Parliament and of the Council of 30 November 2009 relating to appliances burning gaseous fuels (codified version) (Text with EEA relevance), Division 5.5.2: Statistical control is as follows:

Extent: E+W+S+N.I.

Appliances are subject to statistical control by attributes. They should be grouped into identifiable batches consisting of units of a single model manufactured under the same conditions. A batch is examined at random intervals. The appliances constituting a sample are examined individually and appropriate tests, as laid down in the respective standard(s) referred to in Article 5, or equivalent tests are carried out to determine whether the batch is to be accepted or rejected.
A sampling system with the following characteristics is applied:
a level of quality corresponding to a probability of acceptance of 95 %, with a non-conformity percentage of between 0,5 and 1,5 %,
a limit quality corresponding to a probability of acceptance of 5 %, with a percentage of non-conformity of between 5 and 10 %.

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Source: https://www.legislation.gov.uk/eudr/2009/142/annex/II/division/5/division/5.5/division/5.5.2 (the official version)
Page: https://openlegislation.uk/eu-directive-2009-142/annex-II/division-5/division-5.5/division-5.5.2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.