# Meters (Certification) Regulations (Northern Ireland) 1998, Paragraph 7: Multi-register meters

Extent: N.I.

Induction meters
(1) (a) All induction meters with more than one register shall be tested on one register in accordance with paragraphs 5 and 6, and on each and every other register at a low load using Method A, Method B or Method C tests and at an intermediate or high load using Method A test.
(b) For the same load conditions the maximum permitted difference between the error on one register (expressed as a percentage) and the error on any other register (expressed as a percentage) is one.
(c) Every register change mechanism shall be tested for correct operation with an applied voltage of 90% of the declared system voltage.
Static meters
(2) (a) All static meters with more than one register shall be tested on one register in accordance with paragraphs 5 and 6.
(b) On static meters with more than one register, where the total units are the sum of all the registers, a further test shall be carried out on each and every other register using Method A.
(c) On static meters with more than one register, where the total units are recorded on one register, only this register is required to be tested in accordance with paragraphs 5 and 6.

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Source: https://www.legislation.gov.uk/nisr/1998/444/schedule/3/paragraph/7 (the official version)
Page: https://openlegislation.uk/meters-certification-regulations-northern-ireland-1998/schedule-3/paragraph-7
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.