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Paragraph 10 Insulation property testI1

Northern Ireland

Each meter shall be tested to demonstrate that the insulation of the meter is of a sufficient standard to enable the meter to operate safely and correctly in the conditions in which it could reasonably be expected to be installed and operated.

TABLE 1

Influence QuantitlesReference ValueTolerance
Ambient temperatureReference temperature or, if not indicated, 23°C.>15°C to <30°C ±3°
Meter PositionVertical±1.5%
VoltageReference voltage±0.5%
FrequencyReference frequency 50Hz
Voltage and current waveformSinusoidal formDistortion factor <5%
External magnetic induction at the reference frequency (paragraph 5(4))ZeroInduction 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
7 (starting-current)10.5% Ib to 1.0% Ib0.5% to 1.0%0.5% to 1.0%0.5% to 1.0%Single and polyphaseBalanced

Annotations

Commencement

I1

Sch. 1 para. 10 in operation at 1.2.1999, see reg. 1