# The Meters (Certification) Regulations 1990, Paragraph 2: Non-registration test


Induction meters
(1) Meters shall be tested to ensure that when the current circuits are open and a voltage of 110% of the marked voltage is applied to the voltage circuits, rotors cease to rotate before completing one complete revolution.
Static meters
(2) Meters shall be tested for non-registration by one of the following methods–
Method 1
(a) (i) When subjected to the test conditions specified in paragraph 2(1), meters shall not emit more than one output pulse over a minimum time period determined in paragraph (ii);
(ii) Minimum test period=60000/k minutes, where k=number of pulses per kWh emitted by a meter.
Method 2
(b) When static meters are fitted with inhibiting circuits, they may be tested for non-registration with a current, which is less than the threshold current in respect of a meter of that type, applied to the current circuits and a voltage of 100% of the marked voltage applied to the voltage circuits of the meters under test. Meters shall not emit more than one output pulse over a minimum time period determined as follows–
Minimumtestperiod=126000V×I×kminutes where V=marked voltage, I=total current and k=number of pulses emitted per kWh by a meter.
Method 3
(c) The period calculated for Method 1 or Method 2 may be halved, provided that the meters under test do not emit any output pulses during the period of the test.

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Source: https://www.legislation.gov.uk/uksi/1990/792/schedule/1/paragraph/2 (the official version)
Page: https://openlegislation.uk/meters-certification-regulations-1990/schedule-1/paragraph-2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.