Paragraph 2 Non-registration testI1
Northern Ireland
Induction meters
Induction 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 revolution.
Static meters
Static meters shall be tested for non-registration by one of the following methods—
Method 1
When subjected to the test conditions specified in paragraph 2(1), the meter shall not emit more than one output pulse over the minimum test period determined in paragraph (ii);
the minimum test period (t) shall be computed by the formula:
where:
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k = number of pulses per kWh emitted by the meter
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m = number of elements
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V = declared system voltage
-
Im = marked maximum current.
Method 2
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 test period (t) determined as follows—
where:
-
V = declared system voltage
-
I = total current of all phases
-
k = number of pulses per kWh emitted by the meter
-
pf = power factor.
Annotations
Commencement
- I1
Sch. 3 para. 2 in operation at 1.2.1999, see reg. 1