# The Measuring Instruments Regulations 2016, Paragraph 5.2


The display of the total energy shall have a sufficient number of digits to ensure that when the meter is operated for 4,000 hours at full load (I = Imax, U = Un and PF = 1) the indication does not return to its initial value and shall not be able to be reset during use.

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Source: https://www.legislation.gov.uk/uksi/2016/1153/schedule/1E/paragraph/5.2 (the official version)
Page: https://openlegislation.uk/measuring-instruments-regulations-2016/schedule-1E/paragraph-5.2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.