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Meters (Certification) Regulations (Northern Ireland) 1998

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Regulations 3(2)(c) and 4(2)(d)

SCHEDULE 1Authorised Manufacturers' and authorised repairers' tests and testing methods for alternating current watthour meters

Pre-heating

1.—(1) The following tests shall not be carried out until the voltage circuits of meters under test and the voltage circuit of working standard integrating meters have been energised for a period of one hour or half an hour if a current of not less than either 10% of basic current or 5% of marked current is applied to the current circuit of the meters, save that the non-registration and starting current tests may be carried out during the pre-heating period.

(2) Sub-paragraph (1) shall not apply to a meter which the examiner is satisfied is capable of full operation as soon as it is energised.

Non-registration test

2.  Induction meters

(1) Induction meters shall be tested to ensure that when the current circuits are open and a voltage of 110% of the declared system voltage is applied to the voltage circuits, rotors cease to rotate before completing one complete revolution.

Static meters

(2) Static meters shall be tested for non-registration by one of the following methods—

(a) Method 1

(a)(i)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);

(ii)the minimum test period (t) shall be computed by the formula:

No math image to display

where:

  • k = number of pulses per kWh emitted by the meter

  • m = number of elements

  • V = declared system voltage

  • Im = marked maximum current.

(b) 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 declared system voltage applied to the voltage circuits of the meters under test. Meters shall not emit more than one output pulse over the minimum test period (t) determined as follows—

No math image to display

where:

  • V = declared system voltage

  • I = total current of all phases

  • k = number of pulses emitted per kWh by the meter

  • pf = power factor.

(c) Method 3

(c)The period calculated for Method 1 or Method 2 may be halved if the meters under test do not emit any output pulses during the period of the test.

Accuracy tests

3.—(1) Apparatus used for determining the errors of repaired meters during these tests shall comply with the directions.

(2) The rate of advance of a meter over a test period shall be obtained by reading the electro-mechanical register or electronic display on or connected to meters or by monitoring the rotation of a disc or pulse output of a meter.

(3) For any test load, the load applied to a working standard integrating meter shall not be less that 25% or more than 125% of its full load rating.

(4) For a working standard wattmeter, the applied load shall not be less than 40% or more than 100% of its full scale or range reading.

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 test

(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.

Conditions for all testing

5.—(1) The tests shall be carried out in accordance with Table 1.

Meter position

(2) The meter position requirement given in Table 1 applies to induction meters only. Tolerance applies to the vertical wall on which the meter base is mounted and a horizontal reference line or edge on the meter such as the lower edge of the terminal block.

Voltage and current supplies for polyphase meters

(3) (a) The order of the phases shall correspond to the sequence shown on the connection diagram.

(b)The voltages shall be balanced so that the voltage between any line and neutral or between any two lines shall not differ by more than 1.5% from the mean of the corresponding voltages.

(c)The currents shall be balanced so that the current in any conductor shall not differ by more than 2.5% from the mean of these currents.

(d)The phase displacement between the current and corresponding phase to neutral voltage shall not differ from other current and voltage phase displacements by more than 3° at any power factor under any specified load conditions.

External magnetic induction

(4) The test given in Table 1 in respect of external magnetic induction shall be carried out during commissioning or after major modification or refurbishing of a meter testing system. The test consists of determining the errors at 0.1Ib unity power factor with the meters normally connected and then determining the errors —

(a)for single phase meters, after reversing both current and voltage connections, for which half the difference between the two errors is the value of the variation;

(b)for polyphase meters, by making two additional measurements after each of the connections to the current circuits and to the voltage circuits are changed over 120° but with the phase sequence unaltered, for which the greatest difference between each error determined and the mean of the three errors is the value of the variation.

Dial tests

(5) Where all the errors of repaired meters are determined by Method B or Method C test an additional test in accordance with Method A shall be carried out. The Method A test shall be carried out at one of the loads used for the Method B or Method C test. The error obtained by the Method A test shall not differ by more than 0.6% from the error obtained at the same load value by the Method B or Method C test.

Duration of test

(6) The tests described in paragraph 4 shall continue until the error of meters can be calculated within a tolerance not greater than ±0.2%.

Conditions for mixing methods of tests

(7) Method A tests may be used for intermediate and high loads, at unity and at 0.5 power factor, and Method B or Method C tests for the low load, provided that an additional Method B or Method C test is carried out at one of the test load values used for the Method A tests.

Test loads

1.—(1) Every repaired meter shall be tested at each of the loads specified in Table 2, except that test number 2 in that Table may be omitted.

(2) Every new meter shall be calibrated and tested at a sufficient number of load points so as to ensure that meter errors are not greater than the limits specified in paragraph 9.

(3) A test for starting will also be carried out on new meters in accordance with test number 7 of Table 2.

(4) The ratio errors shall be determined for voltage transformers that are intended for use with meters but are not tested with a meter.

(5) Current transformers intended for use with meters but not tested with a meter shall be tested from 5% to 120% of rated current.

Multi-register meters

7.  Induction meters

(1) (a) All induction meters with more than one register shall be tested on one register in accordance with paragraphs 5 and 6 and on each and every other register at a low load using Method A, Method B or Method C tests and at a high load using Method A test.

(b)For the same load conditions the maximum permitted difference between the error on one register (expressed as a percentage) and the error on any other register (expressed as a percentage) is one.

Static meters

(2) (a) All static meters with more than one register shall be tested on one register in accordance with paragraphs 5 and 6.

(b)For repaired meters with more than one register —

(i)where the total units are the sum of all the registers, a further test shall be carried out on each and every other register using Method A but

(ii)where the total units are recorded on one register, only that register is required to be tested in accordance with paragraphs 5 and 6.

Ployphase meters

8.—(1) very polyphase meter shall be tested on a circuit having a phase relationship for which that meter is designed. However, three phase, four wire polyphase meters may be tested without current in the neutral conductor.

(2) Polyphase meters shall be tested by using—

(a)a polyphase kilowatt-hour energy standard;

(b)2 or 3 singlephase kilowatt-hour energy standards; or

(c)2 or 3 singlephase wattmeters.

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 1.5% for tests numbers 1, 2, 3 and 4 given 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 1.0% for tests numbers 1, 2, 3 and 4 given in Table 2.

(3) The maximum error permitted for polyphase whole current and transformer operated meters, when tested with transformers connected, shall not exceed plus 1.7% or minus 2.7% for tests 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 1.2% or minus 2.2% 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%.

Insulation property test

10.  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

Regulation 6(3)

SCHEDULE 2REPORT ON METER TESTS

1.  In respect of each meter to which the report refers, a statement—

(a)that the meter referred in the report is accurately described and whether it is a new or repaired meter;

(b)that the meter has been examined and tested in accordance with Schedule 1 or one of the equivalent European provisions;

(c)that the uncertainty of measurement was not greater than ±0.4% at unity power factor or greater than ±0.6% at 0.5 inductive power factor;

(d)that no meter error was greater than any error specified either in the relevant sub-paragraph of paragraph 9 of Schedule 1 or in one of the equivalent European provisions;

(e)that the meter did not register when energised on voltage only, whether with or without a current less than the threshold current; and

(f)if applicable, as to whether paragraph 1(2) of Schedule 1 did or did not apply (as the case may be).

2.  In respect of each meter to which the report refers, the following particulars—

(a)the name of the person responsible for the manufacture or repair of the meter;

(b)the name and address of the manufacturing unit or repair unit where the meter was examined and tested;

(c)the number of the report and any identification marks impressed on the meter seals in accordance with the provisions of directions;

(d)the declared system voltage on which the meter is to be used;

(e)the make and type of the meter, stating the nominal frequency if other than 50Hz;

(f)the marked current and voltage rating of the meter; and

(g)the serial number of the meter.

3.  A report may include the errors obtained at each test load and an end of test meter reading.

4.  In the case of a meter intended for use with and tested with a transformer or transformers, the following additional information shall be included in the report—

(a)the make, output rating, serial number and classification of each transformer to be used with the meter;

(b)for a polyphase meter, the phase to which each transformer was connected;

(c)particulars and electrical burdens of any other meter, instrument or external attachments that are to be used in conjunction with a transformer operated meter.

5.  Where a transformer intended for use with a meter has been tested, a statement shall be included in the report that—

(a)the transformer referred to in the report is accurately described and whether it is a new or used transformer;

(b)the transformer has been examined and tested in accordance with Schedule 1 or Harmonisation Documents 553 S2(1) and 554 S1(2) approved on 24th March 1992 by the European Committee for Electrotechnical Standardization;

(c)the uncertainty of measurement was not greater than plus or minus 0.1%;

(d)no transformer error was greater than plus or minus 0.5% at any load from 5% to 120% of full load when connected to the maximum rated burden or, if known, the working burden

6.  A report for a transformer shall also include the following information:

(a)the name and address of the manufacturing unit or the repair unit where the transformer was examined and tested;

(b)the make and type of the transformer;

(c)the nominal frequency if other than 50Hz;

(d)the marked current or voltage ratio of the transformer and the working or maximum permissible burden that can be connected to the transformer; and

(e)the serial number of the transformer.

7.  The meter or transformer errors obtained at each test load may also be included in these reports.

8.  Before a meter is submitted for certification, the report on the meter and any transformer submitted with it shall be verified and signed by the person in charge of manufacture or repair (as the case may be) or by a person nominated by him.

Regulation 7(1)(a)

SCHEDULE 3CERTIFICATION TESTS AND TESTING METHODS FOR ALTERNATING CURRENT WATTHOUR METERS

Pre-heating

1.—(1) he following tests shall not be carried out until the voltage circuits of meters under test and the voltage circuit of the working standard integrating meters have been energised for a period of one hour or half an hour if a current of not less than either 10% of basic current or 5% of marked current is applied to the current circuit of the meters, save that the non-registration test may be carried out during the pre-heating period.

(2) Sub-paragraph (1) shall not apply to a meter which the examiner is satisfied is capable of full operation as soon as it is energised.

Non-registration test

Induction meters

2.—(1) 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

(2) Static meters shall be tested for non-registration by one of the following methods—

(a) Method 1

(a)(i)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);

(ii)the minimum test period (t) shall be computed by the formula:

No math image to display

where:

  • k = number of pulses per kWh emitted by the meter

  • m = number of elements

  • V = declared system voltage

  • Im = marked maximum current.

(b) 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 test period (t) determined as follows—

No math image to display

where:

  • V = declared system voltage

  • I = total current of all phases

  • k = number of pulses per kWh emitted by the meter

  • pf = power factor.

Accuracy tests

3.—(1) Apparatus used for determining the errors of meters during these tests shall comply with directions.

(2) The rate of advance of a meter over a test period shall be obtained by reading the electro-mechanical register or electronic display on or connected to the meter or by monitoring the rotation of the disc or pulse output of meters.

(3) For any test load applied to the meters under test, the load applied to a working standard integrating meter shall not be less than 25% or more than 125% of its full load rating.

(4) For a working standard wattmeter, the applied load shall not be less than 40% or more than 100% of its full scale or range reading.

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.

Conditions for testing

5.—(1) The tests shall be carried out in accordance with Table 1.

Ambient temperature

(2) Tests may be carried out at a temperature outside the temperature range given in Table 1, but within the range 15°C to 30°C, providing a correction is made in relation to the reference temperature by using the mean temperature co-efficient of the meters under test and of the working standard meter(s) used for determining meter errors.

Meter position

(3) The meter position requirement given in Table 1 applies to induction meters only. Tolerance applies to the vertical wall on which the meter base is mounted and a horizontal reference line or edge on the meter such as lower edge of the terminal block.

Voltage and current supplies for polyphase meters

(4) (a) The order of the phases shall correspond to the sequence shown on the connection diagram.

(b)The voltages shall be balanced so that the voltage between any line and neutral or between any two lines shall not differ by more than 1.5% from the mean of the corresponding voltages.

(c)The currents shall be balanced so that the current in any conductor shall not differ by more than 2.5% from the mean of these currents.

(d)The phase displacement between the current and corresponding phase to neutral voltage shall not differ from other current and voltage phase displacements by more than 3° at any power factor under any specified load conditions.

External magnetic induction

(5) The test given in Table 1 in respect of external magnetic induction shall be carried out during commissioning or after major modification or refurbishing of a meter testing system. The test consists of determining the errors at 0.1 Ib unity power factor with the meters normally connected and then determining the errors—

(a)for single phase meters, after reversing both current and voltage connections, for which half the difference between the two errors is the value of the variation;

(b)for polyphase meters, by making two additional measurements after each of the connections to the current circuits and to the voltage circuits are changed over 120° but with the phase sequence unaltered, for which the greatest difference between each error determined and the mean of the three errors is the value of the variation.

Dial tests

(6) Where all the errors of meters are determined by Method B or Method C test, an additional test in accordance with Method A shall be carried out. The Method A test shall be carried out at one of the loads used for the Method B or Method C test. The error obtained by the Method A test shall not differ by more than 0.6% from the error obtained at the same load value by the Method B or Method C test.

Duration of test

(7) The tests described in paragraph 4 shall continue until the error of meters can be calculated within a tolerance of not greater than plus or minus 0.2%.

Conditions for mixing methods of test

(8) Method A tests may be used for intermediate and high loads, at unity power factor and at 0.5 power factor, and Method B or Method C tests for the low load, provided that an additional Method B or Method C test is carried out at one of the test load values used for the Method A tests.

Test loads

6.—(1) Every meter shall be tested at each of the loads specified in Table 2.

(2) The ratio errors shall be determined for voltage transformers intended for use with meters but not tested with a meter.

(3) Current transformers intended for use with meters but not tested with a meter shall be tested from 5% to 120% of rated current.

Multi-register meters

7.  Induction meters

(1) (a) All induction meters with more than one register shall be tested on one register in accordance with paragraphs 5 and 6, and on each and every other register at a low load using Method A, Method B or Method C tests and at an intermediate or high load using Method A test.

(b)For the same load conditions the maximum permitted difference between the error on one register (expressed as a percentage) and the error on any other register (expressed as a percentage) is one.

(c)Every register change mechanism shall be tested for correct operation with an applied voltage of 90% of the declared system voltage.

Static meters

(2) (a) All static meters with more than one register shall be tested on one register in accordance with paragraphs 5 and 6.

(b)On static meters with more than one register, where the total units are the sum of all the registers, a further test shall be carried out on each and every other register using Method A.

(c)On static meters with more than one register, where the total units are recorded on one register, only this register is required to be tested in accordance with paragraphs 5 and 6.

Polyphase meters

8.—(1) Every polyphase meter shall be tested on a circuit having a phase relationship for which that meter is designed. However, three phase, four wire polyphase meters may be tested without current in the neutral conductor.

(2) Polyphase meters shall be tested by using—

(a)a polyphase kilowatt-hour energy standard;

(b)2 or 3 single phase kilowatt-hour energy standards; or

(c)2 or 3 single phase wattmeters.

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

Regulation 2

SCHEDULE 4Prescribed periods of certification

TypePhaseWireElementNumber of RegistersApproval NumberCertification Period in Years
1234567
Note:—
*

indicates that the meter is designed for use on a 1, 2 or 3 phase supply

@

indicates that the meter is designed for use on a 3 or 4 wire supply

#

indicates that the meter is designed for use on a 2, 3 or 4 wire supply

ABB
M81121Single84610
T81343Single84510
Ampy
5028121Multi78910
5028L121Single82010
5054122Multi82410
5054C122Multi81410
5056121Multi81710
5057*@3Multi86610
5071121Multi85310
5077121Multi86010
Aron
eI121Single33415
eN121Single46515
G13132Single44215
G13P132Single44210
G23232Single44215
G23P232Single44210
G24242Single44215
G24P242Single44210
G33333Single44215
G33P332Single44210
G34343Single44215
G34P343Single44810
GM13132Single44815
GM13P132Single44810
GM23232Single44815
GM23P232Single44810
GM24242Single44815
GM24P242Single44810
GM33332Single44815
GM33P332Single44810
GM34343Single44815
GM34P343Single44810
GTM13132Single44815
GTM13P132Single44810
GTM23232Single44815
GTM23P232Single44810
GTM24242Single44815
GTM24P242Single44810
GTM33332Single44815
GTM33P332Single44810
GTM34343Single44815
GTM34P343Single44810
CEWE
2243332Multi84110
2343343Multi83910
3243332Multi84210
3343343Multi84010
CE332Single79610
CE332Single79110
CE343Single79510
CE343Single79010
Chamberlain & Hookham
K121Single33815
PT2*@2Single46215
PT2D*@2Single46210
PT4343Single46220
PT4D343Single46210
Dennis Ferranti
B1V7121Multi86410
TM3c121Single48120
EE/GEC
B31B121Single35815
C11B121Single60320
C11B-D121Single61510
C11B-D/M121Single61510
C11B-DR121Multi61510
C11B-DR/M121Multi61510
C11B-R121Multi61310
C11B-R/M121Multi61320
C11B/M121Single62725
C11B2121Single62820
C11B2-D121Single63710
C11B2-DR121Multi63710
C11B2-R121Multi62820
C11B2A121Single62820
C11B2A-R121Multi62815
C11B2C121Single63210
C11B2C-R121Multi63210
C11B3121Single84710
C11B3C121Single84810
C21B121Single57720
C21B-R121Multi58510
C21B-R/M121Multi58515
C21B/M121Single57720
C31B121Single50920
C31B-D121Single52410
C31B-D/M121Single52410
C31B-DR121Multi58010
C31B-DR/M121Multi58010
C31B-R121Multi50315
C31B-R/M121Multi50315
C31B/M121Single50925
CM1121Multi76410
CM2121Multi78310
CM4121Multi79310
CM5121Multi79410
CM6121Multi81210
CM7121Multi81310
D42B*@2Single49415
D42B-D*@2Single51010
D42B-D/M*@2Single51010
D42B-DR*@2Multi51010
D42B-DR/M*@2Multi51010
D42B-R*@2Multi50710
D42B-R/M*@2Multi50710
D42B/M*@2Single49415
D42BC*@2Single57015
D42BC-D*@2Single57010
D42BC-D/M*@2Single57010
D42BC/M*@2Single57015
D42F*@2Single49715
D42F-D*@2Single51010
D42F-D/M*@2Single51010
D42F-DR*@2Multi51010
D42F-DR/M*@2Multi51010
D42F-R*@2Multi50710
D42F-R/M*@2Multi50710
D42F/M*@2Single49715
D43B343Single49515
D43B-R343Multi49510
D43B-R/M343Multi49510
D43B/M343Single49515
D43F343Single54815
D43F/M343Single54815
E42B*@2Single59015
E42B-D*@2Single59210
E42B-D/M*@2Single59210
E42B-DR*@2Multi59410
E42B-DR/M*@2Multi59410
E42B-R*@2Multi59410
E42B-R/M*@2Multi59410
E42B/M*@2Single59015
E42B2*@2Single64515
E42B2-D*@2Single64910
E42B2-DR*@2Multi65110
E42B2-R*@2Multi64710
E42B3*@2Single51015
E42B3-D*@2Multi51010
E42B3-DR*@2Single51010
E42B3-R*@2Multi51010
E42B4*@2Single51015
E42B4-D*@2Single51015
E42B4-DR*@2Multi51010
E42B4-R*@2Multi51010
E42BC*@2Single59715
E42BC-D*@2Single60010
E42BC-D/M*@2Single60010
E4BC/M*@2Single59710
E42C-2D*@2Single61910
E42C-2D/M*@2Single61910
E42C-2DR*@2Multi62010
E42C-2DR/M*@2Multi62010
E42F*@2Single60215
E42F-D*@2Single62210
E42F-D/M*@2Single62210
E42F-DR*@2Multi62310
E42F-DR/M*@2Multi62310
E42F-R*@2Multi62310
E42F-R/M*@2Multi62310
E42F3*@2Single51015
E42F3-D*@2Single51010
E42F3-DR*@2Multi51010
E42F3-R*@2Multi51010
E42F4*@2Single51015
E42F4-D*@2Single51010
E42F4-DR*@2Multi51010
E42F4-R*@2Multi51010
E43B343Single59115
E43B-D343Single59510
E43B-D/M343Single59515
E43B-DR343Multi59510
E43B-DR/M343Multi59510
E43B-R343Multi59510
E43B-R/M343Multi59510
E43B/M343Single59120
E43B2343Single64415
E43B2-D343Single64610
E43B2-DR343Multi64610
E43B2-R343Multi64610
E43B3343Single74915
E43B3-D343Single74910
E43B3-DR343Multi74910
E43B3-R343Multi59110
E43B4343Single74915
E43B4-D343Single74910
E43B4-DR343Multi74910
E43B4-R343Multi59110
E43C-2D343Single61710
E43C-2D/M343Single61710
E43C-2DR343Multi61810
E43C-2DR/M343Multi61810
E43F343Single62115
E43F-D343Single62310
E43F-DR343Multi62310
E43F-R343Multi62310
E43F3343Single74915
E43F3-D343Single74910
E43F3-DR343Multi74910
E43F3-R343Multi59110
E43F4343Single74915
E43F4-D343Singl74910
E43F4-DR343Multi74910
E43F4-R343Multi74910
EP2332Multi84910
EP2332Multi84910
EP2J332Multi85010
EP3*#3Multi85110
EP3J*#3Multi85210
HA1121Single77310
HA1121Multi77310
LSA01-001343Single77110
LSA02-001343Single78610
LSA02-002343Single77210
PM1121Multi80010
PM2332Multi83210
PM3*#3Multi83310
SC2B121Multi84310
TM1121Multi80910
TM2122Multi81010
UVE121Single31010
Ferranti/FML/Siemens
F2K-100121Single67720
F2K-100-2121Multi68115
F2K-100I121Single68820
F2K-100I-2121Multi68815
F2K-100L121Single68520
F2K-100L-2121Multi68515
F2K-11B121Single70320
F2K-11B-2121Multi71310
F2K-500121Single71010
F2K-500C121Single71710
F2K-500C-2121Multi71710
F2K-500C-9121Multi71710
F2K-500D121Multi73610
F2K-500D-2121Multi74310
F2K-500D-9121Multi74310
F2K-50B121Single70210
F2Q-100121Single63020
F2Q-10D121Single67210
F2Q-10W121Multi66810
F2Q-11B121Single63820
F2Q-11D121Single67310
F3K-100*@2Single70515
F3K-100-2*@2Multi70510
F3K100I*@2Single73015
F3K-100I-2*@2Multi73010
F3K-100L*@2Single70515
F3K-100L-2*@2Multi72910
F3K-10B*@2Single73415
F3K-10B-2*@2Multi73410
F3K-11B*@2Single73315
F3K-11B-2*@2Multi73310
F3K-11BL*@2Single73315
F3K-11BL-2*@2Multi73315
F4K-100*@2Single69515
F4K-100-2343Multi70410
F4K-100I343Single73015
F4K-100I-2343Multi73010
F4K-100L343Single72915
F4K-100L-2343Multi72910
F4K-10B343Single71215
F4K-10B-2343Multi71210
F4K-10BI343Single73015
F4K-10BI-2343Multi73010
F4K-10BL343Single72915
F4K-10BL-2343Multi72910
F4K-11B343Single69615
F4K-11B-2343Multi70410
F4K-11BI343Single73015
F4K-11BI-2343Multi73010
F4K-11BL343Single72915
F4K-11BL-2343Multi72910
FM121Single32315
FMm121Single34215
FMMD121Single44310
FMmMD121Single44310
FMmP121Single36410
FMmP2121Single40210
FMmX343Single41515
FMmXT343Single41515
FMmY*@2Single41415
FMmYT*@2Single41415
FMP121Single35010
FMP2121Multi40610
FMQ121Single54920
FMT121Multi45510
FMX343Single41520
FMXa343Single48815
FMXaT343Multi51810
FMXMD343Single43410
FMXMDR2343Multi66710
FMXT343Multi45710
FMY*@2Single41415
FMYMDR2*@2Multi66710
FN12121Single52720
FN12D121Single55310
FN12P121Single53510
FN12PF121Single53610
FN12Q121Single52820
FN12QD121Single57910
FN12QP121Single54110
FN12QPF121Single54210
FN12R2121Multi54910
FN33*@2Single54015
FN33D*@2Single66610
FN33Q*@2Single54015
FN33QR2*@2Multi55210
FN33R2*@2Multi55210
FN34343Single53815
FN34D343Single55410
FN34DR2343Multi66610
FN34Q343Single54515
FN34QD343Single55410
FN34QR2343Multi53810
FN34R2343Multi55110
FNA33*@2Single58915
FNA33D*@2Single56010
FNA33Q*@2Single58915
FNA33QR2*@2Multi58910
FNA33R2*@2Multi58910
FNA34343Single54515
FNA34D343Single56010
FNA34Q343Single54520
FNA34QD343Single60610
FNA34QR2343Multi55110
FNA34R2343Multi54310
FNAB33*@2Single65615
FNAB33D*@2Single65910
FNAB33Q*@2Single65615
FNAB33QR2*@2Multi65710
FNAB33R2*@2Multi65710
FNAB34343Single65215
FNAB34D343Single65910
FNAB34Q343Single65220
FNAB34QD343Single65910
FNAB34QR2343Multi65215
FNAB34R2343Multi65310
FNE12121Single52720
FNE12D121Single55310
FNE12P121Single53510
FNE12PF121Single53610
FNE12Q121Single52820
FNE12QD121Single57910
FNE12QP121Single54110
FNE12QPF121Single54210
FNE12QR2121Multi55010
FNE12R2121Multi55010
FNE33*@2Single54015
FNE33D*@2Single55410
FNE33Q*@2Single54015
FNE33QD*@2Single55410
FNE33QR2*@2Multi55210
FNE33R2*@2Multi55210
FNE34343Single53815
FNE34D343Single55410
FNE34Q343Single54515
FNE34QD343Single55410
FNE34QR2343Multi55110
FNE34R2343Multi55110
FNEA33*@2Single54315
FNEA33D*@2Single56010
FNEA33Q*@2Single54315
FNEA33QD*@2Single56010
FNEA33QR2*@2Multi58910
FNEA33R2*@2Multi58910
FNEA34343Single54315
FNEA34D343Single56010
FNEA34Q343Single54515
FNEA34QD343Single56010
FNEA34QR2343Multi55110
FNEA34R2343Multi55110
FNN2121Single57420
FNN2Q121Single57425
FNN2QC121Single68920
FNN2QD121Single62610
FPQ-102121Single63910
S2A-100121Single86210
S2A-200121Multi87010
S2S-500A1121Single75410
S2S-500A2121Single75410
S2S-600A121Multi76210
S2S-601A121Multi82710
S2S-700A121Multi75810
S2S-720A121Multi85610
S2S-730A122Multi85710
S4S-100RP343Multi80510
S4S-11BP343Multi78710
S4S-11BRP343Multi78710
Ganz
GE24121Single76010
GH42343Single76110
Horstmann
NU 076121Multi83610
NU 076 2122Multi83710
NU070121Multi80310
NU070 2122Multi80310
Iskra
E89E2121Single76610
E89ED2121Multi76710
E96E2121Single80810
T31AT2343Single76910
T31ATD2343Multi77010
T37E2343Single78010
Landis & Gyr
CF6121Single51115
CH1121Single46620
CH1d121Multi46610
CL127121Single67520
CL127D121Multi67510
CL147121Single68620
CL147d121Multi68715
CL17121Single50820
CL17d121Multi50810
CL27121Single53325
CL27.1121Single57525
CL27.1d121Multi57510
CL27.2121Single61425
CL27.2d121Multi61420
CL27d121Multi53320
CL28121Single54620
CL28d121Multi54610
CL7121Single46325
CL7d121Multi46315
CM147121Single73520
CM147d121Multi73510
CM147dk10121Multi73710
CM147k10121Single73710
DF3*@2Single47515
DF34*@2Single51515
DF34d*@2Multi51510
DF3d*@2Multi47510
FF10332Single81110
FF34*@2Single51515
HF3*@2Single47515
HF34*@2Single51510
HF34d*@2Single51510
HF3d*@2Multi44110
MF10343Single81110
MF3343Single42515
MF34343Single51515
MF34d343Multi51610
MF3d343Multi42515
MH1343Single47910
MH1d343Multi47910
ML240343Multi83110
ML240xtf3343Multi83110
VL11*@2Single58815
VL11.5*@2Single58815
VL11.5d*@2Multi58810
VL11101332Single81110
VL11d*@2Multi58810
VL122*@2Single65410
VL122d*@2Multi65410
VL123*@2Single65410
VL123d*@2Multi65410
VL124*@2Single65415
VL124d*@2Multi65410
VL125*@2Single65415
VL125d*@2Multi65410
YL1343Single52515
YL11343Single53120
YL11101343Single81110
YL11d343Multi53215
YL120343Single65415
YL120d343Multi65410
YL121343Single65415
YL121d343Multi65415
YL1d343Multi52510
ZCA405121Single79910
ZCB120121Single75710
ZCB120d121Multi75710
ZCB127121Multi78110
ZCB127121Multi78210
ZCB220K121Single82210
ZFA405332Single79710
ZMA405343Single79810
ZMB127*#3Single78810
ZMB127d*#3Multi78810
Met Vick & AEI
NF5121Single40920
NQ121Single49320
NQ/M121Single53020
PRI/SIFAM
CALMU C3D343Multi75010
CALMU C3D+343Multi85410
CALMU C3T*#3Multi75110
CALMU C3T+*#3Multi83410
CALMU C3TV332Multi75210
CALMU C3V+332Multi83510
Sangamo/Schlumberger
CBA 00121Single74710
CBA 02121Multi74710
FX221121Single75710
H10121Single80610
HMT121Single34615
KBA 00121Single74510
KBA 01121Multi74510
KBB121Single81610
KBC121Single86310
KXB121Multi86110
MBA343Multi83810
MTA121Multi77410
MTN121Multi80410
P5A*@2Multi86910
P5A*@3Multi86810
P6A*@3Multi86710
PPA-1343Multi76310
PPA-2343Multi76510
PPB*@3Multi85810
PXA332Multi80210
PXA343Multi77910
S200.13121Single45420
S200.16121Single48225
S200.28121Single57220
S200.30121Single55720
S200.31121Single68325
S200.32121Single58225
S200.33121Single58320
S200.38121Single57325
S200.4121Single43620
S200.7121Single43620
S203.1343Single51915
S204.7121Multi49615
S206.16121Single49210
S206.7121Single49210
S207.2121Single51410
S207.4121Single51410
S210121Single84410
S29.12*@2Single45015
S29.13343Single45115
S29.14*@2Single45015
S29.15*@2Single45015
S29.2*@2Single35315
S29.3343Single35415
S300.1*@2Single58715
S300.3*@2Single64015
S301.1343Single56315
S301.6343Single56320
S301.9343Single64115
S304121Single56110
S304.1121Single56110
S304.10121Single61210
S304.11121Single61210
S304.2121Single56110
S304.4121Single56110
S304.5121Single56110
S304.50121Single68010
S304.51121Single69910
S304.60121Single71410
S304.61121Single71410
S304.9121Single56710
S309.1121Multi56815
S309.2121Multi58420
S309.3121Multi58420
S309.5121Multi72120
S320.1343Single67015
S320.1343Multi67010
S320.4343Single67115
S320.7343Single67415
S320.7343Multi67410
S320.75*@2Multi67910
S321.1343Single58615
S321.6343Single58620
S321.9343Single64215
S322.12343Single66310
S322.15343Single66410
S322.6343Single63310
S322.9343Single63310
S323.1343Multi60710
S323.12343Multi66010
S323.6343Multi60710
S323.9343Multi66510
S325.3*@2Single64315
S326.1*@2Single63410
S326.6*@2Single66510
S326.9*@2Single66910
S327.3*@2Multi66110
S327.6*@2Multi66210
S330.1343Multi69110
SBB121Single82310
SPA01121Single72810
SPA02121Multi72810
SPA03121Multi73110
SPA11121Single72810
SPA13121Multi73110
SPB121Single85510
SPC121Multi86510
SPX121Single82110
ST-Q220343Multi77510
ST-Q230343Multi79210
TRA122Multi76810
TRX122Multi82510
Smith
AM121Single34815
APJ121Single61110
APM121Single36110
APNE121Single56410
APNEQ121Single56410
APQ121Single61110
Jugmera
EE 3000 N121Single85910
(1)

Harmonisation Document 553 S2 entitled “Current transformers” has been adopted in the United Kingdom as BS 7626 entitled “Specifications for current transformers” published by the British Standards Institution (ISBN 0 580 21575 X) and was effective from 15th November 1993

(2)

Harmonisation Document 554 S1 entitled “Voltage transformers” has been adopted in the United Kingdom as BS 7625 entitled “Specification of voltage transformers” published by the British Standards Institution (ISBN 0 580 21573 3) and was effective from 15th February 1993

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