# Meters (Certification) Regulations (Northern Ireland) 1998

S.R. 1998/444 · made 15 December 1999 · revised to 31 December 2020

These Regulations set out the procedure for enabling meters, other than meters deemed to be certified under the Measuring Instruments (EC Requirements) (Electrical Energy Meters) Regulations 1995, S.I. 1995/2607, used for the purpose of measuring the quantity of electricity supplied to customers to be certified and provide for the circumstances in which certification and deemed certification are terminated.

Made under: The Electricity (Northern Ireland) Order 1992 (Article 34, Article 64, Schedule 7 paragraph 6)

## Introductory text

ELECTRICITY
Made 15th December 1999
Coming into operation 1st February 1999
The Director General of Electricity Supply for Northern Ireland, in exercise of the powers conferred on him by Articles 34 and 64 of, and paragraph 6 of Schedule 7 to, the Electricity (Northern Ireland) Order 1992, and of every other power enabling him in that behalf, and with the consent of the Department of Economic Development in accordance with Article 2(2) of that Order, hereby makes the following Regulations:—

## 1 Citation and commencement

These Regulations may be cited as the Meters (Certification) Regulations (Northern Ireland) 1998 and shall come into operation on 1st February 1999.

## 2 Interpretation

In these Regulations—
“approved” means approved by or under Regulations made under paragraph 3 of Schedule 7 to the Order;
“authorised examiner” means a person who is authorised in accordance with regulation 5;
“authorised manufacturer” means a person who is authorised in accordance with regulation 3;
“authorised repairer” means a person who is authorised in accordance with regulation 4;
“certification period” means, in the case of a meter of a type specified in columns 1 to 6 (inclusive) of Schedule 4, the period stated in relation thereto in column 7 of that Schedule and, in the case of any other meter, the period of 10 years, the period beginning in each case on the date on which the meter is certified for the purpose of the Order;
“directions” means any directions issued by the Director under paragraph 7(1) of Schedule 7 to the Order;
“EEA Agreement” means the Agreement on the European Economic Area signed at Oporto on 2nd May 1992 as adjusted by the Protocol signed at Brussels on 17th March 1993.
“EEA State” means a state which, at the date of the entry into force of these Regulations, is a Contracting Party to the EEA Agreement , but does not include the United Kingdom ;
“equivalent European provisions” has the meaning given by regulation 8;
“meter examiner” means a person appointed under paragraph 5 of Schedule 7 to the Order;
“the Order” means the Electricity (Northern Ireland) Order 1992; and
“permitted margins of error” means the margins of error referred to in regulation 7.

## 3 Authorised manufacturer

(1) Subject to paragraph (3) any person who manufactures meters and satisfies the Director that—
(a) he owns or has available to him apparatus for the examination, testing and regulation of meters which complies with directions;
(b) he operates at a manufacturing unit a quality assurance system in respect of every meter manufactured by him at that unit which conforms to the standard contained in European Standard EN ISO 9001, or to any standard, technical regulation, manufacturing method or code of practice accepted in ... EEA States conformity with which will achieve an equivalent assurance of quality; and
(c) he would be capable of complying with the conditions set out in paragraph (2),
may be authorised by the Director for the purpose of these Regulations in respect of meters manufactured by him at that manufacturing unit for a period not exceeding three years but so that any authorisation may be renewed from time to time.
(2) An authorisation granted by the Director to a person who satisfies the provisions of paragraph (1) shall be subject to the following conditions—
(a) that the authorisation will only apply in respect of meters which have been examined, tested and regulated using the apparatus referred to in sub-paragraph (a) of paragraph (1);
b that the authorised person will operate at all times at each manufacturing unit a quality assurance system which conforms to the standard referred to in sub-paragraph (b) of paragraph (1) and will maintain a record in permanent form of the system which he operates and of the actions taken to comply with that system in respect of the meter or meters which he intends to submit for certification in accordance with regulation 6;
(c) that the authorised person shall secure that each meter referred to in sub-paragraph (b) shall be examined and tested in accordance with the provisions of Schedule 1 or one of the equivalent European provisions;
(d) that the authorised person shall cause every meter in respect of which a certificate has been issued under regulation 7 or 9 to be so stored while it remains under his control and so packaged for delivery when it is to be dispatched from his control as to prevent, so far as reasonably practicable, damage which would cause it to operate in a manner which would not conform with the permitted margins of error;
(e) that the authorised person will permit the Director or any persons duly authorised by him to have access to any manufacturing unit and to examine and test all apparatus and to inspect all records referred to in this paragraph at all reasonable times for the purpose of ensuring that the authorised person is complying with the conditions of his authorisation; and
(f) that the authorised person will comply with directions.
(3) An authorisation under this regulation may be terminated at any time by the Director upon giving not less than 28 days' notice to the authorised person if he is in breach of any condition of his authorisation and (in the case of a breach which is capable of being remedied) has failed to remedy that breach as soon as reasonably practicable after notice has been given to him by the Director specifying the breach.
(4) For the purpose of this regulation and Schedule 2—
(a) a person shall be treated as manufacturing a meter if he has caused the meter to be assembled so as to comply with the conditions of his authorisation but has not himself manufactured every component part of the meter;
(b) “assembled” includes the carrying out of repairs or modifications to a meter within a period of twelve months after the date upon which a certificate in respect of that meter was first issued under regulation 7 or 9; and
(c) “manufacturing unit” means premises specified to the Director in writing (which may identify the premises by reference to a plan) at which meters are manufactured but excludes any premises or that part of any premises which are used, otherwise than as provided in sub-paragraph (b), for the cleaning and repair of meters which have previously been used for measuring the quantity of electricity supplied.

## 4 Authorised repairer

(1) Subject to paragraph (3) any person who repairs meters and satisfies the Director that—
(a) he owns or has available to him apparatus for the examination, testing and regulation of meters which complies with directions;
(b) he operates at a repair unit a quality assurance system in respect of every meter repaired by him at that unit which conforms to the standard contained in EuropeanStandard EN ISO 9002, or to any standard, technical regulation, manufacturing method or code of practice accepted in any EEA State conformity with which will achieve an equivalent assurance of quality; and
(c) he would be capable of complying with the conditions set out in paragraph (2), may be authorised by the Director for the purpose of these Regulations in respect of meters repaired by him at that repair unit for a period not exceeding three years but so that any authorisation may be renewed from time to time.
(2) Any authorisation granted by the Director to a person who satisfies the provisions of paragraph (1) shall be subject to the following conditions—
(a) that the authorisation will only apply in respect of meters which have been examined, tested and regulated using the apparatus referred to in sub-paragraph (a) of paragraph (1);
(b) that the authorised person will operate at all times at each repair unit a quality assurance system which conforms to the standard referred to in sub-paragraph (b) of paragraph (1) and will maintain a record in permanent form of the system which he operates and of the actions taken to comply with that system in respect of the meter or meters which he intends to submit for certification in accordance with regulation 6;
(c) that the authorised person will cause each meter which is repaired at a repair unit to be repaired to a standard and using such materials as would reasonably be expected to enable it to operate within the permitted margins of error for not less than the certification period;
(d) that the authorised person shall secure that each meter referred to in sub-paragraph (b) shall be examined and tested in accordance with the provisions of Schedule 1 or one of the equivalent European provisions
(e) that the authorised person shall cause every meter in respect of which a certificate has been issued under regulation 7 or 9 to be so stored while it remains under his control and so packaged for delivery when it is to be dispatched from his control as to prevent, so far as reasonably practicable, damage which would cause it to operate in a manner which would not conform with the permitted margins of error;
(f) that the authorised person will permit the Director or any person duly authorised by him to have access to any repair unit and to examine and test all apparatus and to inspect all records referred to in this paragraph at all reasonable times for the purpose of ensuring that the authorised person is complying with the conditions of his authorisation; and
(g) that the authorised person will comply with directions.
(3) An authorisation under this regulation may be terminated at any time by the Director upon giving not less that 28 days' notice to the authorised person if he is in breach of any condition of his authorisation and (in the case of a breach which is capable of being remedied) has failed to remedy that breach as soon as reasonably practicable after notice has been given to him by the Director specifying the breach.
(4) For the purpose of this regulation and Schedule 2 “repair unit” means premises specified to the Director in writing (which may identify the premises by reference to a plan) at which meters which have previously been used for measuring the quantity of electricity supplied are cleaned, repaired, tested or regulated but excluding any premises or that part of any premises which are used for the manufacture or assembly of meters.

## 5 Authorised examiner

(1) A public electricity supplier, an authorised manufacturer or an authorised repairer may nominate a competent person for the purpose of this regulation.
(2) If the Director is satisfied that a person nominated under paragraph (1) is competent to carry out the functions contained or referred to in regulation 7 the Director may authorise that person to be an examiner for the purpose of certifying meters for the purpose of the Order.
(3) Subject to paragraphs (6) and (7), an authorisation under paragraph (2) shall be granted for a period of 3 years but so that any such authorisation may be renewed from time to time.
(4) A person authorised to be an examiner shall not be authorised to examine any meter which he has (wholly or partly) manufactured or repaired, or one which he has examined, tested or regulated in a capacity other than that of an examiner authorised under paragraph (2).
(5) An authorisation granted by the Director to a person who satisfies the provisions of paragraph (2) shall be subject to the following conditions—
(a) that the authorisation will only apply in respect of meters which have been manufactured or repaired (as the case may be) by the person by whom he was nominated under paragraph (1);
(b) that, where regulation 9 applies, he will examine and test not less than the number of meters selected in accordance with a sampling procedure determined by the Director having regard to national or international sampling procedures or plans;
(c) that he will send to the Director not more than seven days after the expiry of each month a report stating the number of meters which have been submitted to him in accordance with regulation 6 and the number of meters in respect of which a certificate has been issued under regulation 7 or 9 during the preceding month; and
(d) that he will retain a copy of each certificate issued by him for a period of not less than one year from the date of issue and will produce the copy to the Director if requested to do so.
(6) An authorisation under this regulation may be terminated at any time by the Director upon giving not less than 28 days' notice to the authorised person if—
(a) he is in breach of any condition of his authorisation and (in the case of a breach which is capable of being remedied) has failed to remedy that breach as soon as reasonably practicable after notice has been given to him by the Director specifying the breach;
(b) he fails to exercise proper care and attention in performing his functions under regulation 7 or 9; or
(c) he is unable (otherwise than temporarily) to perform his functions under regulation 7 or 9.
(7) Where—
(a) a person nominated under paragraph (1) and authorised under paragraph (2) is temporarily unable for any reason to act as an authorised examiner; and
(b) the person by whom he was nominated has nominated another person under paragraph (1) who has been authorised under paragraph (2); and
(c) the person referred to in sub-paragraph (a) of this paragraph is again able to act as an authorised examiner,
the Director may give not less than 28 days in writing to the authorised person referred to in sub-paragraph (b) of this paragraph terminating his authorisation.

## 6 Application for certification

(1) A person who requires a meter to be certified for the purposes of the Order may submit the meter to an authorised examiner who is authorised to certify a meter submitted by that person, or to a meter examiner.
(2) Each meter which is submitted for certification pursuant to regulation 9 shall be accompanied by a report signed by an authorised manufacturer, an authorised repairer or a public electricity supplier.
(3) A report for the purpose of paragraph (2) shall contain the statements and information specified in Schedule 2 which is appropriate to the type of meter to which it relates including, where that meter is designed to operate with a transformer, the statements and information relating to the transformer.

## 7 Procedure for certification

(1) Subject to regulation 9, a meter which is submitted to a meter examiner or an authorised examiner shall not be certified by him unless, in addition to being satisfied as required by paragraph 6(2)(a) of Schedule 7 to the Order that the meter is of an approved pattern or construction, he is satisfied—
(a) either that the meter has been tested in accordance with the provisions of Schedule 3, conforms to the standards described in that Schedule and can reasonably be expected to operate within the permitted margins of error for not less than the certification period or that it has been tested in accordance with and conforms to one of the equivalent European provisions; and
(b) that it has been sealed in accordance with directions.
(2) The permitted margins of error shall be an error not exceeding 2.5 per centum plus or 3.5 per centum minus at any load at which the meter is designed to operate.
(3) Where the examiner is satisfied that a meter complies with paragraph (1), he shall issue a certificate of compliance specifying the serial number of the meter, and thereupon that meter shall be a meter certified for the purpose of the Order.
(4) Each certificate issued under paragraph (3) shall be numbered in the sequence in which it is issued.

## 8 Equivalent European Provisions

(1) Equivalent European provisions are—
(a) the provisions as to verification in Council Directive 76/891/EEC as amended by Commission Directive No. 82/621/EEC and Protocol 1 and Part IX of Annex II to the EEA Agreement;
(b) European Standard EN 61036; and
(c) any standard, technical regulation, manufacturing method or code of practice accepted by ... EEA States conformity with which will ensure a level of precision, security, safety, durability and fitness for purpose equivalent to that assured by conformity to Schedule 3.
(2) A meter examiner or an authorised examiner to whom a meter has been submitted under regulation 6 shall take into account the results of checks and tests carried out by the bodies and laboratories of ... EEA States if the checks and tests have been carried out in conformity with European standard EN 45001.

## 9 Batch certification

Where—
(a) a number of meters have been submitted to an examiner at the same time by the same person;
(b) that person is a public electricity supplier, an authorised manufacturer or an authorised repairer;
(c) each meter is of an approved pattern or construction and is accompanied by the report referred to in regulation 6(2); and
(d) the examiner has examined and tested a sufficient number of meters to satisfy himself that it provides a reasonable test of all of them,
he may issue a certificate in respect of all the meters so submitted to him specifying or identifying the serial number of each meter and including all the information contained in the report submitted under regulation 6(2) and thereupon each of those meters shall be a meter certified for the purpose of the Order.

## 10 Duration of certification

A meter certified or deemed to be certified for the purpose of the Order shall cease to be so certified or deemed to be so certified—
(a) if the approval of the pattern or construction of that meter is revoked;
(b) f it is or becomes installed in a manner which is not an approved manner of installation;
(c) if any alteration is made to the meter;
(d) if the meter ceases to operate within the permitted margins of error; or
(e) at the expiry of its certification period.
whichever occurs first. whichever occurs first.

## 11 Fees

(1) Subject to paragraph (2), any person who submits under regulation 6 a meter to a meter examiner for certification shall pay to the Director in accordance with paragraph (4), a fee of 34 pence in respect of each meter so submitted.
(2) Where a fee has already been paid to the Director General of Electricity Supply in respect of the submission of a meter for certification under the Electricity Act 1989, no fee shall be payable under paragraph (1) in respect of that meter.
(3) Within seven days after the last day of each calendar month in which a person has submitted a meter to a meter examiner under regulation 6, he shall deliver to the Director a statement of the number of meters which he has submitted during the preceding month.
(4) Within thirty days of the delivery of the statement referred to in paragraph (3), he shall pay to the Director a fee calculated in accordance with paragraph (1) in respect of the meters referred to in that statement.
(5) Subject to paragraph (6), any person who nominates an authorised examiner under regulation 5, other than in the circumstances set out in regulation 5(7)(a) and (b), shall pay to the Director a fee of £7,600 in respect of that examiner’s authorisation.
(6) Where the Director is satisfied that the number of meters which will be submitted under regulation 6 to an authorised examiner in the period of 12 months beginning on the date of his authorisation is likely to be less than 1,000, the fee in respect of the authorisation shall be £540.
(7) Paragraphs (5) and (6) shall apply to the renewal of an authorisation under regulation 5 as it applies to an original authorisation granted under that regulation.

## Signature

Sealed with the Official Seal of the Department of Electricity Supply for Northern Ireland on
L.S.
Douglas B. McIldoon
Director General of Electricity Supply for Northern Ireland
15th December 1998.
The Department of Economic Development hereby consents to the foregoing Regulations.
Sealed with the Official Seal of the Department of Economic Development on
L.S.
J.E. Wolstencroft
Assistant Secretary
15th December 1998.

## Schedule 1: Authorised Manufacturers' and authorised repairers' tests and testing methods for alternating current watthour meters

## 1 Pre-heating

(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.

## 2 Non-registration test

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—
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:
t≥480×106k.m.V.Imminuteswhere:
k = number of pulses per kWh emitted by the meter
m = number of elements
V = declared system voltage
Im = marked maximum current.
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—
t=126000V×I×k×pfminuteswhere:
V = declared system voltage
I = total current of all phases
k = number of pulses emitted per kWh by the meter
pf = power factor.
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.

## 3 Accuracy tests

(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.

## 4 Methods of accuracy test

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.

## 5 Conditions for all testing

(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.

## 1 Test loads

(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.

## 7 Multi-register meters

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.

## 8 Ployphase meters

(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.

## 9 Margins of Error

(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%.

## 10 Insulation property test

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 Quantitles
Reference Value
Tolerance
Ambient temperature
Reference temperature or, if not indicated, 23°C.
>15°C to <30°C ±3°
Meter Position
Vertical
±1.5%
Voltage
Reference voltage
±0.5%
Frequency
Reference frequency 50Hz
Voltage and current waveform
Sinusoidal form
Distortion factor <5%
External magnetic induction at the reference frequency (paragraph 5(4))
Zero
Induction 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 Load
Power Factor
Basic/Maximum
Maximum continuous
Long Range
Short Range
Meter Type
Polyphase Meter Load
Note 1
Where a range is given, any value within that inclusive range may be selected.
Note 2
For maximum continuously rated prepayment meters, the low load test value may be twice the value shown.
Note 3
For Test Numbers 4 and 6, the inductive power factor shall be between 0.45 and 0.55 inclusive.
1 (high)
1
Imax
100%
100%-200% (Note 1)
100%-125% (Note 1)
Single and polyphase
Balanced
2 (intermediate)
1
Ib or 125% Ib
Any load between 25%-75% of the value specified for Test Number 1
Single and polyphase
Balanced
3 (low)
1
5% Ib
1,67% (Note 2)
5%
5%
Single and polyphase
Balanced
4 (inductive)
0.5 (Note 3)
Ib or Imax
100%
The same value selected for Test Number 1
Single and polyphase
Balanced
5 (element)
1
Ib
100%
The same value selected for Test Number 1
Polyphase
One phase loaded in turn
6 (inductive) (element)
0.5 (Note 3)
Ib
100%
The same value selected for Test Number 1
Polyphase
One phase loaded in turn
7 (starting-current)
1
0.5% Ib to 1.0% Ib
0.5% to 1.0%
0.5% to 1.0%
0.5% to 1.0%
Single and polyphase
Balanced

## Schedule 2: REPORT 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 and 554 S1 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.

## Schedule 3: CERTIFICATION TESTS AND TESTING METHODS FOR ALTERNATING CURRENT WATTHOUR METERS

## 1 Pre-heating

(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.

## 2 Non-registration test

Induction meters
(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—
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:
t ge;480×106k.m.V.Imminutes where:
k = number of pulses per kWh emitted by the meter
m = number of elements
V = declared system voltage
Im = marked maximum current.
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—
t=126000V×I×k×pfminutes where:
V = declared system voltage
I = total current of all phases
k = number of pulses per kWh emitted by the meter
pf = power factor.

## 3 Accuracy tests

(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.

## 4 Methods of accuracy test

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.

## 5 Conditions for testing

(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.

## 6 Test loads

(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.

## 7 Multi-register meters

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.

## 8 Polyphase meters

(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.

## 9 Margins of error

(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 Quantities
Reference Value
Tolerance
Ambient temperature
Reference temperature or, if not indicated, 23°C.
± 2°
Meter Position
Vertical
± 3°
Voltage
Reference voltage
± 1.5%
Frequency
Reference frequency 50Hz
± 0.5%
Voltage and current waveform
Sinusoidal form
Distortion factor <5%
External magnetic induction at the reference frequency
Zero
Induction 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 Load
Power Factor
Basic/Maximum
Maximum continuous
Long Range
Short Range
Meter Type
Polyphase Meter Load
Note 1
Where a range is given, any value within that inclusive range may be selected.
Note 2
For maximum continuously rated prepayment meters, the low load test value may be twice the value shown.
Note 3
For Test Numbers 4 and 6, the inductive power factor shall be between 0.45 and 0.55 inclusive.
1 (high)
1
Imax
100%
100%-200% (Note 1)
100%-125% (Note 1)
Single and polyphase
Balanced
2 (intermediate)
1
Ib or 125% Ib
Any load between 25%-75% of the value specified for Test Number 1
Single and polyphase
Balanced
3 (low)
1
5% Ib
1,67% (Note 2)
5%
5%
Single and polyphase
Balanced
4 (inductive)
0.5 (Note 3)
Ib or Imax
100%
The same value selected for Test Number 1
Single and polyphase
Balanced
5 (element)
1
Ib
100%
The same value selected for Test Number 1
Polyphase
One phase loaded in turn
6 (inductive) (element)
0.5 (Note 3)
Ib
100%
The same value selected for Test Number 1
Polyphase
One phase loaded in turn

## Schedule 4 Prescribed periods of certification

Type
Phase
Wire
Element
Number of Registers
Approval Number
Certification Period in Years
1
2
3
4
5
6
7
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
M81
1
2
1
Single
846
10
T81
3
4
3
Single
845
10
Ampy
5028
1
2
1
Multi
789
10
5028L
1
2
1
Single
820
10
5054
1
2
2
Multi
824
10
5054C
1
2
2
Multi
814
10
5056
1
2
1
Multi
817
10
5057
3
Multi
866
10
5071
1
2
1
Multi
853
10
5077
1
2
1
Multi
860
10
Aron
eI
1
2
1
Single
334
15
eN
1
2
1
Single
465
15
G13
1
3
2
Single
442
15
G13P
1
3
2
Single
442
10
G23
2
3
2
Single
442
15
G23P
2
3
2
Single
442
10
G24
2
4
2
Single
442
15
G24P
2
4
2
Single
442
10
G33
3
3
3
Single
442
15
G33P
3
3
2
Single
442
10
G34
3
4
3
Single
442
15
G34P
3
4
3
Single
448
10
GM13
1
3
2
Single
448
15
GM13P
1
3
2
Single
448
10
GM23
2
3
2
Single
448
15
GM23P
2
3
2
Single
448
10
GM24
2
4
2
Single
448
15
GM24P
2
4
2
Single
448
10
GM33
3
3
2
Single
448
15
GM33P
3
3
2
Single
448
10
GM34
3
4
3
Single
448
15
GM34P
3
4
3
Single
448
10
GTM13
1
3
2
Single
448
15
GTM13P
1
3
2
Single
448
10
GTM23
2
3
2
Single
448
15
GTM23P
2
3
2
Single
448
10
GTM24
2
4
2
Single
448
15
GTM24P
2
4
2
Single
448
10
GTM33
3
3
2
Single
448
15
GTM33P
3
3
2
Single
448
10
GTM34
3
4
3
Single
448
15
GTM34P
3
4
3
Single
448
10
CEWE
2243
3
3
2
Multi
841
10
2343
3
4
3
Multi
839
10
3243
3
3
2
Multi
842
10
3343
3
4
3
Multi
840
10
CE
3
3
2
Single
796
10
CE
3
3
2
Single
791
10
CE
3
4
3
Single
795
10
CE
3
4
3
Single
790
10
Chamberlain & Hookham
K
1
2
1
Single
338
15
PT2
2
Single
462
15
PT2D
2
Single
462
10
PT4
3
4
3
Single
462
20
PT4D
3
4
3
Single
462
10
Dennis Ferranti
B1V7
1
2
1
Multi
864
10
TM3c
1
2
1
Single
481
20
EE/GEC
B31B
1
2
1
Single
358
15
C11B
1
2
1
Single
603
20
C11B-D
1
2
1
Single
615
10
C11B-D/M
1
2
1
Single
615
10
C11B-DR
1
2
1
Multi
615
10
C11B-DR/M
1
2
1
Multi
615
10
C11B-R
1
2
1
Multi
613
10
C11B-R/M
1
2
1
Multi
613
20
C11B/M
1
2
1
Single
627
25
C11B2
1
2
1
Single
628
20
C11B2-D
1
2
1
Single
637
10
C11B2-DR
1
2
1
Multi
637
10
C11B2-R
1
2
1
Multi
628
20
C11B2A
1
2
1
Single
628
20
C11B2A-R
1
2
1
Multi
628
15
C11B2C
1
2
1
Single
632
10
C11B2C-R
1
2
1
Multi
632
10
C11B3
1
2
1
Single
847
10
C11B3C
1
2
1
Single
848
10
C21B
1
2
1
Single
577
20
C21B-R
1
2
1
Multi
585
10
C21B-R/M
1
2
1
Multi
585
15
C21B/M
1
2
1
Single
577
20
C31B
1
2
1
Single
509
20
C31B-D
1
2
1
Single
524
10
C31B-D/M
1
2
1
Single
524
10
C31B-DR
1
2
1
Multi
580
10
C31B-DR/M
1
2
1
Multi
580
10
C31B-R
1
2
1
Multi
503
15
C31B-R/M
1
2
1
Multi
503
15
C31B/M
1
2
1
Single
509
25
CM1
1
2
1
Multi
764
10
CM2
1
2
1
Multi
783
10
CM4
1
2
1
Multi
793
10
CM5
1
2
1
Multi
794
10
CM6
1
2
1
Multi
812
10
CM7
1
2
1
Multi
813
10
D42B
2
Single
494
15
D42B-D
2
Single
510
10
D42B-D/M
2
Single
510
10
D42B-DR
2
Multi
510
10
D42B-DR/M
2
Multi
510
10
D42B-R
2
Multi
507
10
D42B-R/M
2
Multi
507
10
D42B/M
2
Single
494
15
D42BC
2
Single
570
15
D42BC-D
2
Single
570
10
D42BC-D/M
2
Single
570
10
D42BC/M
2
Single
570
15
D42F
2
Single
497
15
D42F-D
2
Single
510
10
D42F-D/M
2
Single
510
10
D42F-DR
2
Multi
510
10
D42F-DR/M
2
Multi
510
10
D42F-R
2
Multi
507
10
D42F-R/M
2
Multi
507
10
D42F/M
2
Single
497
15
D43B
3
4
3
Single
495
15
D43B-R
3
4
3
Multi
495
10
D43B-R/M
3
4
3
Multi
495
10
D43B/M
3
4
3
Single
495
15
D43F
3
4
3
Single
548
15
D43F/M
3
4
3
Single
548
15
E42B
2
Single
590
15
E42B-D
2
Single
592
10
E42B-D/M
2
Single
592
10
E42B-DR
2
Multi
594
10
E42B-DR/M
2
Multi
594
10
E42B-R
2
Multi
594
10
E42B-R/M
2
Multi
594
10
E42B/M
2
Single
590
15
E42B2
2
Single
645
15
E42B2-D
2
Single
649
10
E42B2-DR
2
Multi
651
10
E42B2-R
2
Multi
647
10
E42B3
2
Single
510
15
E42B3-D
2
Multi
510
10
E42B3-DR
2
Single
510
10
E42B3-R
2
Multi
510
10
E42B4
2
Single
510
15
E42B4-D
2
Single
510
15
E42B4-DR
2
Multi
510
10
E42B4-R
2
Multi
510
10
E42BC
2
Single
597
15
E42BC-D
2
Single
600
10
E42BC-D/M
2
Single
600
10
E4BC/M
2
Single
597
10
E42C-2D
2
Single
619
10
E42C-2D/M
2
Single
619
10
E42C-2DR
2
Multi
620
10
E42C-2DR/M
2
Multi
620
10
E42F
2
Single
602
15
E42F-D
2
Single
622
10
E42F-D/M
2
Single
622
10
E42F-DR
2
Multi
623
10
E42F-DR/M
2
Multi
623
10
E42F-R
2
Multi
623
10
E42F-R/M
2
Multi
623
10
E42F3
2
Single
510
15
E42F3-D
2
Single
510
10
E42F3-DR
2
Multi
510
10
E42F3-R
2
Multi
510
10
E42F4
2
Single
510
15
E42F4-D
2
Single
510
10
E42F4-DR
2
Multi
510
10
E42F4-R
2
Multi
510
10
E43B
3
4
3
Single
591
15
E43B-D
3
4
3
Single
595
10
E43B-D/M
3
4
3
Single
595
15
E43B-DR
3
4
3
Multi
595
10
E43B-DR/M
3
4
3
Multi
595
10
E43B-R
3
4
3
Multi
595
10
E43B-R/M
3
4
3
Multi
595
10
E43B/M
3
4
3
Single
591
20
E43B2
3
4
3
Single
644
15
E43B2-D
3
4
3
Single
646
10
E43B2-DR
3
4
3
Multi
646
10
E43B2-R
3
4
3
Multi
646
10
E43B3
3
4
3
Single
749
15
E43B3-D
3
4
3
Single
749
10
E43B3-DR
3
4
3
Multi
749
10
E43B3-R3
4
3
Multi
591
10
E43B4
3
4
3
Single
749
15
E43B4-D
3
4
3
Single
749
10
E43B4-DR
3
4
3
Multi
749
10
E43B4-R
3
4
3
Multi
591
10
E43C-2D
3
4
3
Single
617
10
E43C-2D/M
3
4
3
Single
617
10
E43C-2DR
3
4
3
Multi
618
10
E43C-2DR/M
3
4
3
Multi
618
10
E43F
3
4
3
Single
621
15
E43F-D
3
4
3
Single
623
10
E43F-DR
3
4
3
Multi
623
10
E43F-R
3
4
3
Multi
623
10
E43F3
3
4
3
Single
749
15
E43F3-D
3
4
3
Single
749
10
E43F3-DR
3
4
3
Multi
749
10
E43F3-R
3
4
3
Multi
591
10
E43F4
3
4
3
Single
749
15
E43F4-D
3
4
3
Singl
749
10
E43F4-DR
3
4
3
Multi
749
10
E43F4-R
3
4
3
Multi
749
10
EP2
3
3
2
Multi
849
10
EP2
3
3
2
Multi
849
10
EP2J
3
3
2
Multi
850
10
EP3
3
Multi
851
10
EP3J
3
Multi
852
10
HA1
1
2
1
Single
773
10
HA1
1
2
1
Multi
773
10
LSA01-001
3
4
3
Single
771
10
LSA02-001
3
4
3
Single
786
10
LSA02-002
3
4
3
Single
772
10
PM1
1
2
1
Multi
800
10
PM2
3
3
2
Multi
832
10
PM3
3
Multi
833
10
SC2B
1
2
1
Multi
843
10
TM1
1
2
1
Multi
809
10
TM2
1
2
2
Multi
810
10
UVE
1
2
1
Single
310
10
Ferranti/FML/Siemens
F2K-100
1
2
1
Single
677
20
F2K-100-2
1
2
1
Multi
681
15
F2K-100I
1
2
1
Single
688
20
F2K-100I-2
1
2
1
Multi
688
15
F2K-100L
1
2
1
Single
685
20
F2K-100L-2
1
2
1
Multi
685
15
F2K-11B
1
2
1
Single
703
20
F2K-11B-2
1
2
1
Multi
713
10
F2K-500
1
2
1
Single
710
10
F2K-500C
1
2
1
Single
717
10
F2K-500C-2
1
2
1
Multi
717
10
F2K-500C-9
1
2
1
Multi
717
10
F2K-500D
1
2
1
Multi
736
10
F2K-500D-2
1
2
1
Multi
743
10
F2K-500D-9
1
2
1
Multi
743
10
F2K-50B
1
2
1
Single
702
10
F2Q-100
1
2
1
Single
630
20
F2Q-10D
1
2
1
Single
672
10
F2Q-10W
1
2
1
Multi
668
10
F2Q-11B
1
2
1
Single
638
20
F2Q-11D
1
2
1
Single
673
10
F3K-100
2
Single
705
15
F3K-100-2
2
Multi
705
10
F3K100I
2
Single
730
15
F3K-100I-2
2
Multi
730
10
F3K-100L
2
Single
705
15
F3K-100L-2
2
Multi
729
10
F3K-10B
2
Single
734
15
F3K-10B-2
2
Multi
734
10
F3K-11B
2
Single
733
15
F3K-11B-2
2
Multi
733
10
F3K-11BL
2
Single
733
15
F3K-11BL-2
2
Multi
733
15
F4K-100
2
Single
695
15
F4K-100-2
3
4
3
Multi
704
10
F4K-100I
3
4
3
Single
730
15
F4K-100I-2
3
4
3
Multi
730
10
F4K-100L
3
4
3
Single
729
15
F4K-100L-2
3
4
3
Multi
729
10
F4K-10B
3
4
3
Single
712
15
F4K-10B-2
3
4
3
Multi
712
10
F4K-10BI
3
4
3
Single
730
15
F4K-10BI-2
3
4
3
Multi
730
10
F4K-10BL
3
4
3
Single
729
15
F4K-10BL-2
3
4
3
Multi
729
10
F4K-11B
3
4
3
Single
696
15
F4K-11B-2
3
4
3
Multi
704
10
F4K-11BI
3
4
3
Single
730
15
F4K-11BI-2
3
4
3
Multi
730
10
F4K-11BL
3
4
3
Single
729
15
F4K-11BL-2
3
4
3
Multi
729
10
FM
1
2
1
Single
323
15
FMm
1
2
1
Single
342
15
FMMD
1
2
1
Single
443
10
FMmMD
1
2
1
Single
443
10
FMmP
1
2
1
Single
364
10
FMmP2
1
2
1
Single
402
10
FMmX
3
4
3
Single
415
15
FMmXT
3
4
3
Single
415
15
FMmY
2
Single
414
15
FMmYT
2
Single
414
15
FMP
1
2
1
Single
350
10
FMP2
1
2
1
Multi
406
10
FMQ
1
2
1
Single
549
20
FMT
1
2
1
Multi
455
10
FMX
3
4
3
Single
415
20
FMXa
3
4
3
Single
488
15
FMXaT
3
4
3
Multi
518
10
FMXMD
3
4
3
Single
434
10
FMXMDR2
3
4
3
Multi
667
10
FMXT
3
4
3
Multi
457
10
FMY
2
Single
414
15
FMYMDR2
2
Multi
667
10
FN12
1
2
1
Single
527
20
FN12D
1
2
1
Single
553
10
FN12P
1
2
1
Single
535
10
FN12PF
1
2
1
Single
536
10
FN12Q
1
2
1
Single
528
20
FN12QD
1
2
1
Single
579
10
FN12QP
1
2
1
Single
541
10
FN12QPF
1
2
1
Single
542
10
FN12R2
1
2
1
Multi
549
10
FN33
2
Single
540
15
FN33D
2
Single
666
10
FN33Q
2
Single
540
15
FN33QR2
2
Multi
552
10
FN33R2
2
Multi
552
10
FN34
3
4
3
Single
538
15
FN34D
3
4
3
Single
554
10
FN34DR2
3
4
3
Multi
666
10
FN34Q
3
4
3
Single
545
15
FN34QD
3
4
3
Single
554
10
FN34QR2
3
4
3
Multi
538
10
FN34R2
3
4
3
Multi
551
10
FNA33
2
Single
589
15
FNA33D
2
Single
560
10
FNA33Q
2
Single
589
15
FNA33QR2
2
Multi
589
10
FNA33R2
2
Multi
589
10
FNA34
3
4
3
Single
545
15
FNA34D
3
4
3
Single
560
10
FNA34Q
3
4
3
Single
545
20
FNA34QD
3
4
3
Single
606
10
FNA34QR2
3
4
3
Multi
551
10
FNA34R2
3
4
3
Multi
543
10
FNAB33
2
Single
656
15
FNAB33D
2
Single
659
10
FNAB33Q
2
Single
656
15
FNAB33QR2
2
Multi
657
10
FNAB33R2
2
Multi
657
10
FNAB34
3
4
3
Single
652
15
FNAB34D
3
4
3
Single
659
10
FNAB34Q
3
4
3
Single
652
20
FNAB34QD
3
4
3Single
659
10
FNAB34QR2
3
4
3
Multi
652
15
FNAB34R2
3
4
3
Multi
653
10
FNE12
1
2
1
Single
527
20
FNE12D
1
2
1
Single
553
10
FNE12P
1
2
1
Single
535
10
FNE12PF
1
2
1
Single
536
10
FNE12Q
1
2
1
Single
528
20
FNE12QD
1
2
1
Single
579
10
FNE12QP
1
2
1
Single
541
10
FNE12QPF
1
2
1
Single
542
10
FNE12QR2
1
2
1
Multi
550
10
FNE12R2
1
2
1
Multi
550
10
FNE33
2
Single
540
15
FNE33D
2
Single
554
10
FNE33Q
2
Single
540
15
FNE33QD
2
Single
554
10
FNE33QR2
2
Multi
552
10
FNE33R2
2
Multi
552
10
FNE34
3
4
3
Single
538
15
FNE34D
3
4
3
Single
554
10
FNE34Q
3
4
3
Single
545
15
FNE34QD
3
4
3
Single
554
10
FNE34QR2
3
4
3
Multi
551
10
FNE34R2
3
4
3
Multi
551
10
FNEA33
2
Single
543
15
FNEA33D
2
Single
560
10
FNEA33Q
2
Single
543
15
FNEA33QD
2
Single
560
10
FNEA33QR2
2
Multi
589
10
FNEA33R2
2
Multi
589
10
FNEA34
3
4
3
Single
543
15
FNEA34D
3
4
3
Single
560
10
FNEA34Q
3
4
3
Single
545
15
FNEA34QD
3
4
3
Single
560
10
FNEA34QR2
3
4
3
Multi
551
10
FNEA34R2
3
4
3
Multi
551
10
FNN2
1
2
1
Single
574
20
FNN2Q
1
2
1
Single
574
25
FNN2QC
1
2
1
Single
689
20
FNN2QD
1
2
1
Single
626
10
FPQ-102
1
2
1
Single
639
10
S2A-100
1
2
1
Single
862
10
S2A-200
1
2
1
Multi
870
10
S2S-500A1
1
2
1
Single
754
10
S2S-500A2
1
2
1
Single
754
10
S2S-600A
1
2
1
Multi
762
10
S2S-601A
1
2
1
Multi
827
10
S2S-700A
1
2
1
Multi
758
10
S2S-720A
1
2
1
Multi
856
10
S2S-730A
1
2
2
Multi
857
10
S4S-100RP
3
4
3
Multi
805
10
S4S-11BP
3
4
3
Multi
787
10
S4S-11BRP
3
4
3
Multi
787
10
Ganz
GE24
1
2
1
Single
760
10
GH42
3
4
3
Single
761
10
Horstmann
NU 076
1
2
1
Multi
836
10
NU 076 2
1
2
2
Multi
837
10
NU070
1
2
1
Multi
803
10
NU070 2
1
2
2
Multi
803
10
Iskra
E89E2
1
2
1
Single
766
10
E89ED2
1
2
1
Multi
767
10
E96E2
1
2
1
Single
808
10
T31AT2
3
4
3
Single
769
10
T31ATD2
3
4
3
Multi
770
10
T37E2
3
4
3
Single
780
10
Landis & Gyr
CF6
1
2
1
Single
511
15
CH1
1
2
1
Single
466
20
CH1d
1
2
1
Multi
466
10
CL127
1
2
1
Single
675
20
CL127D
1
2
1
Multi
675
10
CL147
1
2
1
Single
686
20
CL147d
1
2
1
Multi
687
15
CL17
1
2
1
Single
508
20
CL17d
1
2
1
Multi
508
10
CL27
1
2
1
Single
533
25
CL27.1
1
2
1
Single
575
25
CL27.1d
1
2
1
Multi
575
10
CL27.2
1
2
1
Single
614
25
CL27.2d
1
2
1
Multi
614
20
CL27d
1
2
1
Multi
533
20
CL28
1
2
1
Single
546
20
CL28d
1
2
1
Multi
546
10
CL7
1
2
1
Single
463
25
CL7d
1
2
1
Multi
463
15
CM147
1
2
1
Single
735
20
CM147d
1
2
1
Multi
735
10
CM147dk10
1
2
1
Multi
737
10
CM147k10
1
2
1
Single
737
10
DF3
2
Single
475
15
DF34
2
Single
515
15
DF34d
2
Multi
515
10
DF3d
2
Multi
475
10
FF10
3
3
2
Single
811
10
FF34
2
Single
515
15
HF3
2
Single
475
15
HF34
2
Single
515
10
HF34d
2
Single
515
10
HF3d
2
Multi
441
10
MF10
3
4
3
Single
811
10
MF3
3
4
3
Single
425
15
MF34
3
4
3
Single
515
15
MF34d
3
4
3
Multi
516
10
MF3d
3
4
3
Multi
425
15
MH1
3
4
3
Single
479
10
MH1d
3
4
3
Multi
479
10
ML240
3
4
3
Multi
831
10
ML240xtf3
3
4
3
Multi
831
10
VL11
2
Single
588
15
VL11.5
2
Single
588
15
VL11.5d
2
Multi
588
10
VL11101
3
3
2
Single
811
10
VL11d
2
Multi
588
10
VL122
2
Single
654
10
VL122d
2
Multi
654
10
VL123
2
Single
654
10
VL123d
2
Multi
654
10
VL124
2
Single
654
15
VL124d
2
Multi
654
10
VL125
2
Single
654
15
VL125d
2
Multi
654
10
YL1
3
4
3
Single
525
15
YL11
3
4
3
Single
531
20
YL11101
3
4
3
Single
811
10
YL11d
3
4
3
Multi
532
15
YL120
3
4
3
Single
654
15
YL120d
3
4
3
Multi
654
10
YL121
3
4
3
Single
654
15
YL121d
3
4
3
Multi
654
15
YL1d
3
4
3
Multi
525
10
ZCA405
1
2
1
Single
799
10
ZCB120
1
2
1
Single
757
10
ZCB120d
1
2
1
Multi
757
10
ZCB127
1
2
1
Multi
781
10
ZCB127
1
2
1
Multi
782
10
ZCB220K
1
2
1
Single
822
10
ZFA405
3
3
2
Single
797
10
ZMA405
3
4
3
Single
798
10
ZMB127
3
Single
788
10
ZMB127d
3
Multi
788
10
Met Vick & AEI
NF5
1
2
1
Single
409
20
NQ
1
2
1
Single
493
20
NQ/M
1
2
1
Single
530
20
PRI/SIFAM
CALMU C3D
3
4
3
Multi
750
10
CALMU C3D+
3
4
3
Multi
854
10
CALMU C3T
3
Multi
751
10
CALMU C3T+
3
Multi
834
10
CALMU C3TV
3
3
2
Multi
752
10
CALMU C3V+
3
3
2
Multi
835
10
Sangamo/Schlumberger
CBA 00
1
2
1
Single
747
10
CBA 02
1
2
1
Multi
747
10
FX221
1
2
1
Single
757
10
H10
1
2
1
Single
806
10
HMT
1
2
1
Single
346
15
KBA 00
1
2
1
Single
745
10
KBA 01
1
2
1
Multi
745
10
KBB
1
2
1
Single
816
10
KBC
1
2
1
Single
863
10
KXB
1
2
1
Multi
861
10
MBA
3
4
3
Multi
838
10
MTA
1
2
1
Multi
774
10
MTN
1
2
1
Multi
804
10
P5A
2
Multi
869
10
P5A
3
Multi
868
10
P6A
3
Multi
867
10
PPA-1
3
4
3
Multi
763
10
PPA-2
3
4
3
Multi
765
10
PPB
3
Multi
858
10
PXA
3
3
2
Multi
802
10
PXA
3
4
3
Multi
779
10
S200.13
1
2
1
Single
454
20
S200.16
1
2
1
Single
482
25
S200.28
1
2
1
Single
572
20
S200.30
1
2
1
Single
557
20
S200.31
1
2
1
Single
683
25
S200.32
1
2
1
Single
582
25
S200.33
1
2
1
Single
583
20
S200.38
1
2
1
Single
573
25
S200.4
1
2
1
Single
436
20
S200.7
1
2
1
Single
436
20
S203.1
3
4
3
Single
519
15
S204.7
1
2
1
Multi
496
15
S206.16
1
2
1
Single
492
10
S206.7
1
2
1
Single
492
10
S207.2
1
2
1
Single
514
10
S207.4
1
2
1
Single
514
10
S210
1
2
1
Single
844
10
S29.12
2
Single
450
15
S29.13
3
4
3
Single
451
15
S29.14
2
Single
450
15
S29.15
2
Single
450
15
S29.2
2
Single
353
15
S29.3
3
4
3
Single
354
15
S300.1
2
Single
587
15
S300.3
2
Single
640
15
S301.1
3
4
3
Single
563
15
S301.6
3
4
3
Single
563
20
S301.9
3
4
3
Single
641
15
S304
1
2
1
Single
561
10
S304.1
1
2
1
Single
561
10
S304.10
1
2
1
Single
612
10
S304.11
1
2
1
Single
612
10
S304.2
1
2
1
Single
561
10
S304.4
1
2
1
Single
561
10
S304.5
1
2
1
Single
561
10
S304.50
1
2
1
Single
680
10
S304.51
1
2
1
Single
699
10
S304.60
1
2
1
Single
714
10
S304.61
1
2
1
Single
714
10
S304.9
1
2
1
Single
567
10
S309.1
1
2
1
Multi
568
15
S309.2
1
2
1
Multi
584
20
S309.3
1
2
1
Multi
584
20
S309.5
1
2
1
Multi
721
20
S320.1
3
4
3
Single
670
15
S320.1
3
4
3
Multi
670
10
S320.4
3
4
3
Single
671
15
S320.7
3
4
3
Single
674
15
S320.7
3
4
3
Multi
674
10
S320.75
2
Multi
679
10
S321.1
3
4
3
Single
586
15
S321.6
3
4
3
Single
586
20
S321.9
3
4
3
Single
642
15
S322.12
3
4
3
Single
663
10
S322.15
3
4
3
Single
664
10
S322.6
3
4
3
Single
633
10
S322.9
3
4
3
Single
633
10
S323.1
3
4
3
Multi
607
10
S323.12
3
4
3
Multi
660
10
S323.6
3
4
3
Multi
607
10
S323.9
3
4
3
Multi
665
10
S325.3
2
Single
643
15
S326.1
2
Single
634
10
S326.6
2
Single
665
10
S326.9
2
Single
669
10
S327.3
2
Multi
661
10
S327.6
2
Multi
662
10
S330.1
3
4
3
Multi
691
10
SBB
1
2
1
Single
823
10
SPA01
1
2
1
Single
728
10
SPA02
1
2
1
Multi
728
10
SPA03
1
2
1
Multi
731
10
SPA11
1
2
1
Single
728
10
SPA13
1
2
1
Multi
731
10
SPB
1
2
1
Single
855
10
SPC
1
2
1
Multi
865
10
SPX
1
2
1
Single
821
10
ST-Q220
3
4
3
Multi
775
10
ST-Q230
3
4
3
Multi
792
10
TRA
1
2
2
Multi
768
10
TRX
1
2
2
Multi
825
10
Smith
AM
1
2
1
Single
348
15
APJ
1
2
1
Single
611
10
APM
1
2
1
Single
361
10
APNE
1
2
1
Single
564
10
APNEQ
1
2
1
Single
564
10
APQ
1
2
1
Single
611
10
Jugmera
EE 3000 N
1
2
1
Single
859
10

## Explanatory note

(This note is not part of the Regulations.)
These Regulations set out the procedure for enabling meters, other than meters deemed to be certified under the Measuring Instruments (EC Requirements) (Electrical Energy Meters) Regulations 1995, S.I. 1995/2607, used for the purpose of measuring the quantity of electricity supplied to customers to be certified and provide for the circumstances in which certification and deemed certification are terminated.
Regulations 1 and 2 provide for the citation, commencement and interpretation of the Regulations.
Regulations 3 and 4 (which introduce Schedule 1) set out the procedure for persons who manufacture or repair meters to be authorised by the Director General of Electricity Supply for Northern Ireland ( “the Director”) in relation to the certification procedure, the conditions imposed on an authorisation and the circumstances in which it can be revoked. Regulation 5 provides for persons nominated by public electricity suppliers, authorised manufacturers or authorised repairers to be authorised as examiners by the Director for certification purposes, the conditions imposed on an authorisation and the circumstances in which it can be revoked.
Regulation 6 (which introduces Schedule 2) sets out the procedure to be followed when applying for a meter to be certified. Regulation 7 (which introduces Schedule 3) sets out the procedure for certification of individual meters. Regulation 8 specifies the equivalent European provisions testing in accordance with which may be relied upon as an alternative to the tests and testing methods described in Schedules 1 and 3. Regulation 9 sets out the procedure for batch certification.
Regulation 10 provides for the circumstances in which a meter shall cease to be certified. Regulation 11 provides for fees in respect of the submission of meters to meter examiners for certification and in respect of authorised examiners' authorisations.
These Regulations were notified in draft to the European Commission in accordance with Council Directive 83/189/EEC (O.J. No. L109, 26.4.83, p. 8) (as amended by Council Directive 88/182/EEC (O.J. No. L81, 26.3.88, p. 75) and Council Directive 94/10/EC (O.J. No. L100, 19.4.94, p. 100)).
In Great Britain the corresponding Regulations are the Meters (Certification) Regulations 1998. The Director General of Electricity Supply has prepared a compliance cost assessment in relation to those Regulations and a copy of that assessment together with the Northern Ireland Supplement prepared by the Director General of Electricity Supply for Northern Ireland are held at OFREG, Brookmount Buildings, 42 Fountain Street, Belfast BT1 5EE, from where copies may be obtained on request.
Copies of the European Standards EN ISO 9001 (referred to in regulation 3), EN ISO 9002 (referred to in regulation 4), EN 45001 and EN 61036 (referred to in regulation 8) and Harmonisation Documents 553 S1 and 554 S1 (referred to in paragraph 5 of Schedule 2) may be obtained by post from the British Standards Institution at: 389 Chiswick High Road, London W4 4AL.
Attention is drawn to the provisions of the Measuring Instruments (EC Requirements) (Electrical Energy Meters) Regulations 1995, the effect of which is to ensure that, for the purposes of Schedule 7 to the Electricity (Northern Ireland) Order 1992, instruments bearing the mark of EC initial verification are treated in the same way as instruments certified under these Regulations.

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Source: https://www.legislation.gov.uk/nisr/1998/444 (the official version)
Page: https://openlegislation.uk/meters-certification-regulations-northern-ireland-1998
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.