# The Meters (Certification) Regulations 1998, Paragraph 8: Polyphase meters

Extent: E+W+S

(1) Every polyphase meter shall be tested on a circuit having a phase relationship for which that meter is designed, provided that three phase, four wire polyphase meters may be tested without current in the neutral conductor.
(2) Polyphase meters shall be tested by using—
(a) a polyphase kilowatt-hour energy standard;
(b) 2 or 3 single phase kilowatt-hour energy standards; or
(c) 2 or 3 single phase wattmeters.

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Source: https://www.legislation.gov.uk/uksi/1998/1566/schedule/3/paragraph/8 (the official version)
Page: https://openlegislation.uk/meters-certification-regulations-1998/schedule-3/paragraph-8
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.