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Meters (Certification) Regulations (Northern Ireland) 1998
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Methods of accuracy test
4. Method A test
(1) A long period dial test where the advance of a kWh display, which is part of or connected to a meter under test, is compared with the advance of a precision kilowatt-hour meter.
Method B test
(2) A short period test where the rate of advance of a meter under test is compared to the rate of advance of a precision kilowatt-hour meter.
Method C
(3) A short period test where the actual rate of advance of a meter, when tested under constant power conditions over a specified test period is compared to the calculated rate of advance for those conditions.
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