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Meters (Certification) Regulations (Northern Ireland) 1998

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Margins of error

9.—(1) The maximum error permitted for—

(a)single phase and polyphase whole current meters; and

(b)single phase and polyphase transformer operated meters when tested with transformers connected

shall not exceed plus or minus 1.9% for test numbers 1, 2, 3 and 4 in Table 2.

(2) The maximum error permitted for both single phase and polyphase transformer operated meters, when tested without transformers connected, shall not exceed plus or minus 1.4% for test numbers 1, 2, 3 and 4 given in Table 2.

(3) The maximum error permitted for polyphase whole current meters and transformer operated meters, when tested with transformers connected, shall not exceed plus 2% or minus 3% for test numbers 5 and 6 given in Table 2.

(4) The maximum error permitted for polyphase transformer operated meters, when tested without transformers connected, shall not exceed plus 1.5% or minus 2.5% for test numbers 5 and 6 given in Table 2.

(5) Where current and voltage transformers, which are intended to be used with meters, are not tested connected to a meter then the total error of the transformers at any load point throughout the rated range shall not exceed 0.5%.

TABLE 1

Influence QuantitiesReference ValueTolerance
Ambient temperatureReference temperature or, if not indicated, 23°C.± 2°
Meter PositionVertical± 3°
VoltageReference voltage± 1.5%
FrequencyReference frequency 50Hz± 0.5%
Voltage and current waveformSinusoidal formDistortion factor <5%
External magnetic induction at the reference frequencyZeroInduction value that does not produce a relative error variation of more than ±0.3%

TABLE 2

Test load in terms of marked current
Test Number and LoadPower FactorBasic/MaximumMaximum continuousLong RangeShort RangeMeter TypePolyphase Meter Load
Note 1Where a range is given, any value within that inclusive range may be selected.
Note 2For maximum continuously rated prepayment meters, the low load test value may be twice the value shown.
Note 3For Test Numbers 4 and 6, the inductive power factor shall be between 0.45 and 0.55 inclusive.
1 (high)1Imax100%100%-200% (Note 1)100%-125% (Note 1)Single and polyphaseBalanced
2 (intermediate)1Ib or 125% IbAny load between 25%-75% of the value specified for Test Number 1Single and polyphaseBalanced
3 (low)15% Ib1,67% (Note 2)5%5%Single and polyphaseBalanced
4 (inductive)0.5 (Note 3)Ib or Imax100%The same value selected for Test Number 1Single and polyphaseBalanced
5 (element)1Ib100%The same value selected for Test Number 1PolyphaseOne phase loaded in turn
6 (inductive) (element)0.5 (Note 3)Ib100%The same value selected for Test Number 1PolyphaseOne phase loaded in turn

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