# The Meters (Certification) Regulations 1998, Paragraph 1: Pre-heating

Extent: E+W+S

(1) The following tests shall not be carried out until the voltage circuits of meters under test and the voltage circuits of working standard integrating meters have been energised for a period of one hour or half an hour if a current of not less than either 10 per cent. of basic current or 5 per cent. of marked current is applied to the current circuits of the meters, provided that the non-registration and starting current tests may be carried out during the pre-heating period.
(2) Sub-paragraph (1) shall not apply to a meter which the examiner is satisfied is capable of full operation as soon as it is energised.

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Source: https://www.legislation.gov.uk/uksi/1998/1566/schedule/1/paragraph/1 (the official version)
Page: https://openlegislation.uk/meters-certification-regulations-1998/schedule-1/paragraph-1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.