CELEX: 51973PC0276
Language: en
Date: 1973-02-23
Title: Proposed directive of the Council concerning the harmonization of legislation in the Member States relating to electrical energy meters (submitted to the Council by the Commission)

ARCHIVES HISTORIQUES
DE LA COMMISSION
COLLECTION RELIEE DES
DOCUMENTS "COM"
COM (73) 276
Vol. 1973/0043
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 ---pagebreak--- COMMISSION OF THE EUROPEAN COMMUNITIES
                                                   COM(73)276   final
                                                   Brussels , 23 February 1973
                       Proposed directive of the Council
     concerning the harmonization of legislation in the Member States
                     relating to electrical energy meters
                ( submitted to the Council by the Commission )
   COM(73 ) 276 final
 ---pagebreak---                                STATEMENT OF REASONS
I. GENERAL - OBSERVATIONS
     The present directive is an application of Article 100 of the Treaty in
     conjunction with the Council Directive of 26 July 1971 concerning the
     harmonization of legislation in the Member States relating to common provi-
     aions ofj' measuring instruments and methods of metrological testing ( 1 ).
     Its object is to eliminate the technical barriers to intra-C©mmunity
     trade af present existing in the electrical energy, meter sector as a result
     of the disparity between national legislations relating to these meters
     in' the - Member States .  '    .
     A comparative examination of the . regulations applicable to electrical'
     energy meters has shown that the differences are not limited only to the
     technical pravisions relating to construction , materials , indication de­
     vices and inscriptions , but also to the accuracy , the methods of metrolo­
     gical testing to which these meters are subjected before being marketed
     and their utilization .
    .A similar situation prevails as regards exchanges , awing to the obliga­
     tion upon manufacturers to diversify their production in order to conform
     with the regulations in force in the Member State in which these meters
     are to be used , and to submit to repeated tests performed in differing
     ways .
     As the existing national legislations are justified by the legitimate
     concern tw protect consumer and .user , their harmonization appears to be
     the only means of eliminating, the; drawbacks arising from their divergence
     and of creating the necessary , conditions for the establishment of the''
     Common Market .
( 1 ) Journal Officiel des Communautés Européennes n° L 202 of 6 September 1971 »
 ---pagebreak---  Although the aim of this directive , is mainly metrological , i.e. , the
 harmonization of the relevant provisions , the problems of meter safety
 have nontheless not been disregarded . The directive impeses on meters
 provisions designed to ensure the correct functioning of the meter not
 only from the standpoint of its measuring qualities but also from that
 of safety of use . As regards the other safety aspects which are not
 regulated in the present directive , it must of course be borne in mind
 that these are dealt with in the directive already approvod. byvthe
 Council relating to electrical equipment destined to be used within .cer­
 tain voltage limits .             ,,              ,  • >            ,•
 Aft important discussion on acceptance test conditions took place between
 the experts consulted , the issue being whether these tests should be
 carried out on each met^r or statistically, by a sampling method .
                                                      •        r*
 The countries which do not at present require the primary examination are
 reluctant 'to set up the ponderous and expensive oontrol system, which this
 would entail .   However , some of the experts consulted said they could
"hot iacceipt statistical testing because at the present moment , despite the
 work in progress in international organizations such as the International
 Electrotechnical Commission or the . European Committee for th% Coordina­
 tion of the Electrical Standards of Member Countries of the European
 Community ( CEKELCOM ) , no. agreement has . yet been reached on such a method *
 The directive therefore presents a method of primary individual examina­
 tion .  But the Commission is aware of the limitations of this solution ,
 and has undertaken to present a modification, of the directive in this
 sense . This proposed modification will- be submitted as : soon., as possi­
 ble for examination to the Committee for Adaptation to Technical Pro­
 gress for the measuring instruments sector-, •
 ---pagebreak---      As regards the legal provision , the first article defines the field of
     application of the directive , i.e. , it lists the electrical energy me-'
     ters defined in the annex to the directive .
     Article 2 stipulates that the electrical energy meters which can receive
     the EEC marks and signs are described in the annex and that EEC approval
     of the model is required in all cases .
     For the primary . examination , on the ; other hand , this article provides
     that the test shall be imposed only where such a provision exists for
     national meters .   This nuance is inserted in order to allow- for the
     existing situation in certain Member States ..     It should be noted that
     this solution has already been adopted as regards        approval of the model
     in the directive relating to length measurements .
     Article 3 specifies that when electrical energy meters are provided with
     the EEC model approval mark , and where appropriate with the EEC primary
     examination mark , they nay be imported , marketed and used as meters sa­
     tisfying the national provisions .
     The period of time for introduction , fixed at 18 months as in the other
     directives adopted in the measuring instruments sector , is specified in
     Article k .  In addition this article obliges Memeber States to communi­
     cate to the Commission the text of any internal laws which they may
     adopt, in the field of the present directive .
     Article 5 indicates that this directive is addressed to all the Member
     States .
II . SOLUTION BY HARMONIZATION
     The solution by harmonization actually chosen is called optional , like
     that adopted for most of the special directives in the measuring instru­
     ment sector . The optional harmonization solution is proposed as an al­
     ternative to the solution of total harmonization in the Council directive
     relating to measuring instruments and methods of metrological testing .
 ---pagebreak---                                     - 4 -
I ^
     This optional harmonization means that the electrical energy meters
     satisfying the present Directive can be marketed and. used freely as
     between Member States in the same way as electrical energy meters
     which have satisfied the national tests can be marketed and used
     within each of the Member States ,
HI. CONSULTATION 0? PARLIAMENT AND OF THE ECONOMIC AND SOCIAL OCMTITTEE
     The opinion of these two bodies appears necessary to conform with the
     provisions of Article 100 , para. 2 . Implementation of the directive 's
   ' provisions will necessitate modification of the laws of certain Member
     States .        •
               »
 ---pagebreak---                                   Α Ν Κ Ε Χ
           to the statement of reasons for the proposed directive
                         on electrical energy meters
Legislation in force in the Member States relating to electrical' etiergy
meters .
1 . Belgium
    - Royal decree of 6 August 1962 relating to electrical energy meters .
    - Ministerial decree of 10 August 1962 concerning model approval . '
2 . German:/
    - Law on the metrology and calibration of weights and measures ( cali­
      bration law - Eichgesetz ) of 11 July 1969 .
    - Regulation on calibration ( Eichordnung ) in the version of regulation
      *\ kc concerning the modification of the regulation on calibration .
3 . France
    - Decree of 28 December 1935 relating to the examination of electrical
      energy meters ( Journal officiel of 1 January 1936 ).
    - Order of 29 December 195^ relating to the construction and approval
      of types of electrical energy meter ( Journal officiel of 9 January 1955 ) «
    - Order of       December 195^ relating to the primary examination of new
      electrical energy meters ( Journal officiel of 9 January 1955 ).
k . Italy
    - Royal decree of 11 July 19^-1 - XIX - No . 110^
    - Reyal decree of 11 July 19^1 - XIX - K° 1105
    - Law of 1 July 1963 N° 186
    - Standard 13-2 of section N° 1?8 Edition XII-61 ( CNR/CEI )
    - Standard 38-1 of sectien N° 236 Edition VII-68 ( CNR/CEI )
    - Standard 38-2 of section N° 237 Edition VII-68 ( CNR/CEI )
    - Publication K° 53-111 of 13 February 1 96 1 ( CNR/CEI )
 ---pagebreak--- Netherlands
- Law on measuring instruments of 22 April 1937 , published in the
  Journal officiel NfH. 527 . . ... - L,.
- Regulation on measuring instruments of 29 April 1939 *
- Royal decree of 5 February " 1970 concerning electrical energy
  meters .
- Ministerial decree of 9 May 1939 relating to measuring instruments .
Luxembourg
Nil .
 ---pagebreak---                         Proposed directive of the Council
    concerning the harmonization of legislation in the Member States
                    relating t© electrical energy meters
The Council of the European Communities ,
in view of the Treaty establishing the European Economic Community , and
in particular its Article 100 ,
in view of the Commission 's proposal ,                                   t
in view of the opinion of the European Parliament ,
in view of the opinion of the Economic and Social Committee ,
considering that , in the Member States , the construction and also the
methods of testing of electrical " en'et'gy "meters are the subject of strict
regulations which differ from one Member State to another and hence impede
trade in these meters ; that a harmonization of these regulations is - there­
fore necessary ;                                     ■ :
considering that the directive of the Council of 26 July 1971 , concern­
ing the harmonization of legislation in .the Member States relating to co^«-
iion .provisions. o£- , oeasuring instruments and methods of metrological
testing has defined the procedures for EEC approval of the model and EEC
primary examination ; that in conformity with this directive it is neces­
sary to specify the technical provisions for the construction and opera­
tion of electrical energy meters ;
considering that the above directive also stipulates that particular di­
rectives may fix when conditions permit , the date at which each Member
State is to abrogate the national provisions applicable to instruments
similar to those which satisfy the Coromunity provisions ; that in the
present case it is net yet permitted-, to fix this date :
 HAS ADOPTED THE PRESEM" DIRECTIVE :
 ---pagebreak---                                        2 •
                                   Article 1
                                             ι. ■   »■
The present directive is applicable to induction meters , in current use ,
with direct connection , new , with single or multiple tariffs , designed
to measure the active power single-phase or three-phase current at 30 Hz
frequency .
                                   Article- 2
                                                _           ..          *
The electrical energy meters which may be given EEC marks and signs are
described in an Annex to this Directive .           They shall ke the subject of
the EEC type approval . They shall not be submitted to the EEC primary
                        t      ■ i                ,
examination except where a corresponding check is prescribed for natio­
nal electrical energy meters .                       ■■     «     ■ ■:•   ■ "
                                   Article 3
Member States may not prevent , prohibit or restrict the marketing and
putting into operation of electrical energy meters bearing the sign of
EEC type approval and where appropriate of the EEC primary examination .
                                   Article k
1 . The Member States shall put into force the laws , regulations and admi­
    nistrative action necessary for conformity to the present Directive
    within 18 months following notification of it and ^hall inform the
    Commission immediately .
2 . The Member States shall take care . to communicate to the Commission the
    test of anyi-provisions ofinternal iaw which they may adopt in the field
    covered by the present Directive .
                                   Article 5
This Directive is addressed to all Member States .
 ---pagebreak---                          ANNEX
                , CHAPTER I - DEFINITIONS .
Definition of certain terms used in the present Annex
Magnitude or factor of influence
Any magnitude , or any phenomenon other than the measured magni­
tude , the effects of which may modify the result of the measure­
ment ...                       . -
Variation of error as a function of a magnitude of influence
Difference, between' the errors of the' meter when a single magni­
tude of influence assumes in succession two specified values .
Reference value of a magnitude of influence
Value of this magnitude as a function of which certain charac­
teristics of the meter are fixed .
Basic
 ' 1
        current ( I.D )
Value of the current as a function of which the values of cer­
tain characteristics of the meter are fixed .
Maximum current (I max )                  . . ■■. •
Value ©f current up to which the meter should satisfy the provi­
sions relating to accuracy .
Distortion factor
Ratio of the effective valu£ of the remainder obtained by sub­
tracting the fundamental factor from a non-sinusoidal alternating
magnitude , to the effective value of the non-sinusoidal magnitude
The 1 distortion factor is usually expressed as a percentage .
Nominal speed of rotation
The Value of the speed of rotation of the roter , under the refe­
rence conditions ( section 5*2 . ) , for the basic current and a
power factor of 1 .                     *
Nominal torque
The value o-f the torque exerted on the rotor at rest , under the
reference conditions ( section 5«2 .), for the basic current and a
pewer factor of 1 .
 ---pagebreak--- 1.9         Nominal insulation voltage
            The highest value , of. -the -voltage' - with respect to the earth to
            which the circuits of a meter can be raised in normal service .
1 • 10•     Model                               ».       - -   .    . .»•           •- •
            Designation used to define all the meters with a single tariff
            or multiple tariffs , nadeby one and t-he earn® manufacturer J to
           'which correspond :        ~v
            - the same metrological properties ,
            - uniformity of construction of the parts which determine these
         .    qualities , ..               ........          .
            - the same ratio between maximum current and basic current ,
            - various basic currents and various reference voltages .
Remarks
a)     These meters are designated , by the manufacturer , by one or more
       groupes either of letters or of numbers , or of a combination of
       letters and numbers . Each model has one' designation only .
b)     The model is represented by the sample meter/meters intended for mo­'> • • 'V W
       del approval tests , the characteristics of whicff ( basic currents and -
       reference voltage ) are chosen from among those appearing in the ta­
       bles proposed by the manufacturer ( section 6.1.1 .).
c.) .. In the case , of special productions , the product of the number of turns
    . of the wind.ings.jand the intensity of the basic current , may differ
       from that . of the sample meters representing the model .. The number
       immediately above or below should be' chosen , so as to. have a whole
       number of turns .                                                  ■ ... t
       As a result , o,f this , the number of turns per voli of the voltage win­
       dings pust no.t differ by more than 20 % from that' of the sample meters
       representing the model .                          ,       rc :-.
d)     The ratio of the highest to the lowest nominal ©peed of rotation of
       the rotor of each meter of the same model must not exceed 1.5 *
 ---pagebreak---            CHAPTER II - TECHNICAL SPECIFICATIONS
Kechanical spécifications
General
The insulating materials used in the meters must for practical pur­
poses be non-hygroscopic and not easily inflammable . .
All the parts exposed to corrosion under conditions of use must be
effectively protected against corrosion due to atmospheric in­
fluences . The protective1 layers must not be susceptible to dete­
rioration during normal handling , nor to damage by exposure to the
air under the usual conditions of use .
Casing                                                          -
The casing of the meter must for practical purposes be dust-proof .
This casing must be able to be lead sealed or sealed in such a
way that the internal components of the meter cannot be accessible
until after the seals have been removed .
Meters for which the reference voltage is higher than 250 volts
referred to earth , and of which the casing is completely or partly
metallic , must be provided with a correctly rated protective ter­
minal .
Windows
If the casing of the meter is ncit "transparent , it must include one
or more windows for reading the indicator and observing the move­
ment of the rotor . These windows must be covered by plates of
transparent material which it must be impossible to remove without
breaking the seals .
Terminals - terminal plates
The terminals must be grouped in one or more terminal plates of suf­
ficient mechanical strength . They must permit the jfixing of rigid
conductors or of cables .
It must be pessible easily to disconnect, the voltage terminals
from the current input terminals .
 ---pagebreak--- Connection of the conductors to t.he terminals must be made in such
a way as ensure sufficient and durable contact , so that there - is
no risk of loosening or excessive heating . The holes which are a
prolongation of the terminal holes in the insulating material must
be large enough to allow the easy insertion of the insulation of
the conductors .
Note
The material of which the terminal plate is made must satisfy            the
test of ISO recommendation R- 75 ( 1958 ) , section 6 , for a tempera­
ture of 135 °C .                       .   .            u      . '
                        J     '
Terminal cover
The terminals of the meter must be covered by a terminal cover
which it must be possible to seal independently of the lid .
When the meter is mounted on its board , it must not be possible to
reach the terminals without breaking the seals on the terminal
cover . The terminal cover must therefore cover the upper part of
the terminal plate , the screws which hold the conductors in the
terminals and , if necessary , a sufficient length , of the connecting
conductors and their insulation .
Indicating device
The indicating device may consist of drums or pointers .
The unit of the indicating device must be the kilowatt hour .
In the case of indicating devices with drums , the unit must be
stated near the drum assembly .
In the case of indicating devices with pointers , there should be^
marked near the unit dial : 1 kWh/div,~ and alongside the other
dials , the number ; of 'kilowatt' hours corresponding to one division ,
i.e. 10 ; 100 ; 1*,000 . ; ,         -
                                                 , Λ ·.   .· :     * ■ ι
                                         »
The dial of pointer-type indicating devices , or the drum of
drum-type indicating devices , which indicates one-tenth of the
reading unit must be framed - or coloured .
 ---pagebreak---                                               - 5 -
            The dial , or continuous rotation drum , indicating the lowest values
            must include a scale of 100 equal divisions , or any other arrange­
            ment giving similar accuracy of reading .
            The indicating devicfe irtust' be able to record , from zero , for a
            minimum of 1,500 hours , the energy corresponding to the maximum
            current at the reference voltage and a power factor of one .
                                                          %
            All the indications appearing on the indicating device must be
            indelible and easily legible .
2 .7•       Direction of rotation of the rotor
            The front part of the rotor , for an observer placed in front of the
            meter and looking at it , must move from left to right . This di­
            rection must be indicated by a fixed arrow , easily . visible and
   . -• ^ indelibler                 "
            The edge , or the edge and the top of the disc , must carry a main
            mark with a width of between one-twentieth and one -thirty- fifth
            of the circumference of the disc , allowing the number of revolu­
            tions to be counted .
            The disc may also carry marks permitting stroboscopic or other
            tests to be made . These marks must not impair the use of the
            main mark when this is used for photo-electric counting of the
            numb.er . .of „ revolutions . of the- disc *.
3•          Electrical spécifications . –
3.1 .       Value of the maximum current
            The maximum current must be a whole multiple of the basic current .
3.2 .       Consumption of the circuits
3.2.1 . Voltage " c'irciï'its" "
            The power consumed by each voltage circuit of a meter must not
            exceed 2 W and 8 VA for the reference voltage and reference fre­
            quency .
3 . 2 . d., Current circuits .
            The - apparent power absorbed by each current circuit must not
    r     - exceed 2.5 VA for the basic current , the reference frequency and
            temperature .        ~
 ---pagebreak---                                   - 6
3«3 »   Heating
      , In the usual conditions of use , the1 windings and insulators
        should not reach a temperature liable to endanger the functio­
        ning of the meter . This aim will be achieved if : the insulating
        materials preserve their dielectrical qualities during the fol­
        lowing test :                                              . T. J •
        This test must be carried out for . two hours on a meter not expo­
        sed to draughts or to direct sunlight , under the following con­
        ditions :
        - current circuits : maximum current
        - voltage circuits and auxiliary circuits
          connected up in servicie for a period
          greater than their thermic time constant ;: ;1.2 times the re­
                                                          ference voltage .
        After this text , the increase in temperature         t of the meter
        windings and the external surface of the casing , whether , metallic
   –    or insulating , must not exceed the values indicated in the table
  - -   below . The meter must not show any damage and must satisfy the
        ir.sulation tests in section
        Increase of temperature «o. t of the windings and the casing
                   „  .    -      ,       !
                 j Parts of the meter      | Zlx t     *C
                                    :
                   Windings Class A               - »5      '-
                   Windings Class E                 80
                 •                        I
                 j External surface of              25
                 i the casing
        The temperatures of the windings are determined by addiftg to - the '
        ambient temperature the heating determined by the resistance varia
        tion method ( see Publication 28 of the International . Electrotechni
        cal Commission 's "International Specifications for a Copper- type
        Annealing").
        The maximum values of the heatings mentioned in the table cor­
        respond , for an ambient temperature of kO °C , to the maximum tem­
        perature fixed by Publication 85 of the I.E.C.
 ---pagebreak---  Insulation tests
 The insulation of all the circuits of a meter must be arranged
 so , as not only to allow it to function correctly , but also to
 ensure suitable protection against the danger . of electric shock
when the meter is in normal service , or in conditions of acci­
dental overload .
Th£ insulators must have a suitable dielectrical rigidity and
offer sufficient resistance to mechanical stresses to preserve
their qualities permanently .
   I      ■- :
Thf insulation quality of the meter circuits will be verified by
          - tests at impulse voltage ,                    ...
          - the dielectrical rigidity test .
General conditions for the insulation tests
The tests are carried out on new meters in normal conditions of
use , i.e. , the meter fully mounted , the casing closed and the
terminal cover in place .
During the test , the insulation quality must - not be altered by
the presence of.dus.t or abnormal humidity . .     .
In the absence of contrary specifications , the normal conditions
for insulation , tests are ;       ■  '
          - ambient temperature          15 . - 25 °C
          - relative humidity            ^5 - 75 %
          -.' atmospherical' pressure    86 . 103 - 106.103 N/m2
      r         :       "                ( 860 - 1060 mbar )
Tests at impulse voltage
The -tests at impulse voltage are provided in order to determine
the. ability of the meter to withstand . without damage excess vol­
tages of short duration but very high value .
Characteristics of the generator
The impulse voltage is produced by an apparatus in which a cer­
tain number of condensers are charged in parallel by a conti­
nuous voltage source , then discharged in series in a circuit in­
cluding. the meter . The impendances of the parts of the circuit
must , be such that the impulse to be applied in a given test re­
mains invariable at all voltages .
 ---pagebreak---  3»^«2 » 2 .  Form of the impulse voltage
              The wave form is that of the normal impulse voltage . It is a
              full impulse voltage with a conventional duration of the front
              of 1.2^us and a conventional duration of up to the half-value
              of 50 ^us .
              It is designated in writing in the form of : impulse voltage
              1.2/50 .
             The tolerances are    :    7
                          on the time of rise .        . + 30 %
                       - on the time of descent          + 20 %
3.H.2.3 »    Peak voltage
             The peak value' of the impulse voltage is j       6 . kV  +   5 %
3            Points of application of the impulse voltage
             The xmpulse voltage muet be applied î
             - between the terminals of each voltage circuity . .
             - between the frame on the one hand and on the ether hand the
                terminals of all the voltage and current circuits connected
                together , including - if any - those auxiliary circuits whose
                reference voltage is higher than 40 V ( when the casing is in­
                                                                   • (
                sulating or has an insulating base , this test should be made
                with the casing open ) j    ,               -            ■
             - in addition , for the meters whose casing is insulating or has
                an insulating base , between , on the one hand , all the terminals
                connected together as above and , on the other , a conducting
                foil surrounding the meter , in contact with a flat metallic
                surface on which rests the base of the meter ; this conducting
                foil must be connected to the accessible conducting parts of
                the base and leave a space of at the most 20 mm around the
                terminals .
3 . 4.2.5 ^  Test procedure and conclusions ' " '
             The test voltage must be applied ten tines , as indicated above ,,
             without inversion of polarity .
             During the test , no disruptive discharge must take place .
             After the test , the meter must , on the one hand , satisfy all the
             specified characteristics and , on the other hand ,, have a varia­
             tion of error not greater than 0.5 % ( uncertainty of measurement ) 0
 ---pagebreak---                                               - 9 -
3.    3*     Test of dielectrical rigidity
3.^.3*1 .    Characteristics of the source of supply
             - Frebuency               ' : 50 Hz + 5 %
             - Wave form                  j practically sinusoidal
             - Voltage                    : variable 0 - 2 kv
            .- Power        ,             : greater than 500 VA .•••
3 •^• 3*2 .  Values and points of application of the test voltage
             The dielectrical rigidity test voltage , at the effective value ,
             and the points of application of the test voltage are indica­
             ted in the table below :
 Test voltage                    Points of application of the test voltage
                         i                                           . ,
                           - between , on the one hand , the frame and , on the
                            ' other hand :
                       i
                              a ) each independent current circuit ;
                              b ) each independent voltage circuit ;
                              c ) each auxiliary circuit whose r.eference volta-
                                  ■ ge is higher than hO V ;
                              d ) each assembly of voltage and current circuits
         2 kV   -              ■    normally connected together inside the meter ;
                                    ( when , the casing is insulating or has an in­
                                    sulating base , these tests should be made with
                                  : the casing open );
                           - in addition , for the meters whose casing is in­
                              sulating or has an insulating base$ between , on
                              the one hand , all the circuits (mentioned above
                              in a ) , b ) and c )) connected together , and , on the
                              ether . hand , a conducting foil placed in the same
                           " conditions as that described in paragraph 3*^«2.*f .
         500 V         ! between , on the one hand , the frame and , on the
                       ]
                           other hand , each auxiliary circuit whose reference
                        i voltage        is equal at the most to *f0 V ( when the ca­
                       j sing is insulating or has an insulating base , this
                        !
                           test should be made with the casing open ) .
The highest ®f the ! between the voltage circuit and the current circuit
two following va- I of each driving part normally connected together ,
luesvs •? 600, V       I after having temporarily suppressed this connection
- twice the refe­          for the duration of the test .
rence voltage when
this is higher
than 300 V. "           :
                       1
 ---pagebreak---                                    - 10 -
3»t-0*3 » Procedure for the dielectrical rigidity test p.nd conclusions
          The dielectrical rigidity test voltage is increased progressi­
          vely for about 30 s • up to the prescribed valul , and main­
          tained at this value - for 60 s»c– It is . then-reduced progres­
          sively , and as quickly as possible , to zero .
          The results of the dielectrical rigidity test are' considered
          satisfactory when' :                                     ••
          - during the test , no abnormality occurs sUch as *: abnormal
             variation of the applied voltage , noise , smell , distortion etc *,
          - after the test , the meter complies with all the specifications ,
             and the variation in the error is not greater than 0.5 %
             ( uncertainty of measurement ).
          Indications to be shown on " "the" meters     "" """ " ""   ""
4.1 ,     Marking plate'' '"'                       """                    .•
          Each meter must carry a marking plate which may be either the
          dial of the indicating device or a plate fixed inside the meter .
                                              I
          The following indications must be shown there , in an indelible
          manner , easily legible and visible from outside :
          a ) the manufacture 's identification mark or trade name :
          b ) the description of the model :
          c ) the sign of EEC type approval of the meter ;
          d ) the description of the number and arrangement of the motor
               components , either in the form single-phase two-wire , three-
              phase four-wire , etc ., or using symbols conforming with a.
               standard harmonized at Community level ;
          e ) the reference voltage s "" '                               '
          f ) the basic current and the maximum current , in the form :
               10-40 A or 10 ( kO ) A :
          g ) the reference frequency 50 Hz ;
          h ) the constant of the meter in either of thes'e forme "2          '
                            x VVh/tr or X tr/kWh
          i ) the serial number of the meter and its year of manufacture .
          The meter may also carry information as to its place ; of manu­
          facture , a commercial description , a special serial number , the
          name of the supplier of electricity , a sign of conformi-ty -to a
          European standard and an indication relating to repairs carried
          out . Except by special authorization , any other indication or in­
          scription is prohibited .
 ---pagebreak---                                             - 11
  " 4.2 .          Connection diagram "                    ., ;
                   Each meter must carry an easily identifiable connection dia­
                   gram showing the correspondence between the connecting ter­
                   minals and the various phases of the conductors to be connected .
                       CHAPTER III - METROLOGICA!;- SPECIFICATIONS
,   5.             Metrological spécifications -
    5.1 .   -   , Maximum errors
                 • Under the reference conditions- described in paragraph 5»2 .,
                   single-phase meters and three-phase meters with balanced loads
                   must not exceed the errors indicated in Table I , and three-
                   phase meters with single-phase loads ( under balanced voltages )
                   must not exceed the errors indicated in Table II .
                                            Table ; I
                   Value of current       l     Power   factor .     Max . tolerated errors
                           0.05 Ife                   1  *       ;           + 2.5 %
          [ from 0.1 Lb to Imax
          I
                                      :   !
                                                      1                      + 2   %         l
                           0.1 I.             0.5 inductive                  + 2.5 %
              from 0.2 Ivb     to   I max     0.5 inductive        I         + 2   %
                                                                   i         ""
                                            Table II
                   Value ef current             Power   factor       Max . tolerated errors
                   0-2 Ib ^ I * Ib                    1                      + 3   %
                    b ^           max                 1          I           + k   %        |
                                                                 i
                   *b                         0.5 inductive                  + 5   %
          I              :                ;                                                 I
                   Net e
                   The single-phase loading of a three-phase meter must be under­
                   stood as only affecting one star voltage in a system with four
 ---pagebreak--- conductors ( one of which is neutral ) 9r a single composed vol­
tage in a system with three conductors ( without a neutral ).
In every case , the complete system of voltages must remain
connected to the meter .
Reference conditions
The tests for the determination of the errors and of the varia­
tions of error as a function of the magnitudes of influence
must be carried out under the following reference conditions :
a) the meter must be closed , that is fitted- wit-h its lid';
b ) in the case of indicating devices with drums , only the drum
    which turns the fastest should be engaged , even if it is
    not visible ;                  «
c ) before any measurement , the voltage must . have been connected
    for at ^. east one hour and the testing currents must each be
    adjusted by progressively increasing or decreasing values
    and connected for a sufficient time for the speed of rota- /
    tion of the rotor to become stabilised ;
In addition , .for three-phase meters
d ) the order of the phases must correspond to the direct se­
    quence (0 - 4 - 8 or R - S - T );                   ,■
e ) the voltages and currents must for practical purposes be
    balanced , i.e. :     ,                         . .    ,
    - each of the simply . and composite voltages should not dif­
      fer by more than 1 % from the mean ef the corresponding
      voltages ;
    - each of the-currents in' the"*conductors should not differ
                 ■ ■■                 ■  ■ .   •) '
      by more the 1 %. from the . mean of .these currents ;
    - the phase displacements presented by each of these cur­
      rents with the corresponding star voltage should not
      differ between themselves by more than 2° . v
The reference values ( with specified tolerances ) of the magni­
tudes of influence are indicated in Table III as follows :
 ---pagebreak---                                  - Table III
Magnitude of influence               Reference  value              Tolerance
Ambient temperature         Reference temperature indica­
                            ted; by the manufacturer or , in         + 2 6C
                            default * 23 °C
Position                    Vertical position ( note 1 )             + 0*5 %
Voltage                     Reference voltage                        + 1   %
Frequency                   50 Hz                                    + 0.5 %
Wave form                   Voltages and currents of si­     Distortion factor
                            nusoidal form for practical      Inot exceeding J>%
                            purposes
Magnetic field             Field , the influence of which is not apprecia­
                            ble , i.e. .'such that the residual induction of
                            this field does not cause any variation of the
                            error , as a percentage , greater than + 0.3 %
                            ( note 2 ) for :
                            single-phase meter : on the one hand for a curr.
                            of 0.1 lb and a power factor of 1 and , on the
                            other hand , for a current of 0.2 It, and a
                           power factor of 0.5 «
                            three-phase meter : for a current equal to
                           0.1 Ib and a power facter of 1 .
         Note 1 . Adjusting verticality
                  a) When the meter has three mounting points , its posi­
                      tion is determined by the height of the isosceles
                      triangle formed by the three centres of these mounting
                      holes ; this height must be vertical .
                  b ) When the meter allows of another method of mounting ,
                      its position is determined , for example , by the rear
                      plane of the frame , which should be vertical , and by
                      the lower part of the terminal plate , which should be
                      horizontal .
 ---pagebreak---                                            }
                                          - 1*f
             Note 2 . Residual magnetic induction of external origin
                       The test method to carry out this check consists :
     ,–          " "   a) "for a single-phas'e nfeteiv in 'determining the dif-
       i                  _ ference between the.'.errors of the m«ter - before- -and
                        : after reversing the connections >of the current and
                     • »" Voltage circuits . Half this difference is the value
                             . variation aoughtj..       -     ---
                       b ) 1 for a three-phase meter', in determining the errors
                           • "of "the met'er ' by supplying 't"he < current and voltage
                               circuits while permuting the phases three times by
                               120° in the direct order , of sequence -.-
                               The difference between each of these errors and
                               their arithmetical mean i-a- the value - of - the varia­
                               tion sought .
         ? -     •                .    .     .
5.3*         Effects of. the magnitude of influenoo --                         ~-
             The variations in the error are determined for each of the
             magnitudes of influence under the conditions indicated in
             Table IV , all the other conditions as in section 5.2 * being
             observed .
 ---pagebreak---                                                 - 15
                                              Table IV
                                                                                                           I
                              Nature of the tests            i          Power       !
  ! Magnitude of
  I
       influence
                _ _
                                 and conditions              j|
                                                             i
                                                                        factor i
    Temperature                                                                       [ Maximum value
     ( note 1 )                                                 »                   I
                                                                                      J of the mean tea-
                                                                |                     j. perature coeffi-
                                                                                      i cient
                                                             I
                           From C.1 Ib to Laax               j             1              + C.1 % / °C
                    i
                           From 0.2 Ib to Iaax               j; 0»5 induct .              + 0.15% / °c
                                                             !
                                                             t                           Maximum permissi­
                                                             i                           ble variation of
                                                             i                           errors
    Position            For an inclination of 3       to the
                        vertical in any direction :          |
                           - at G.C5 Ib           •         |1                               + 3 %
                           - at Ib                           Ij
                                                                          1                  + 1 %
    Voltage             For a variation of + 10 % in
                        relation to the reference
                        voltage :
                           - at 0.1 Ib                       ji           1                  + 1.5 %
                         - - from     to I                   !!           1                  + 1   %
                                    D      ;?jc              j  i   _ .         -
    Frequency           For a variation of + 5 % as
                        against 50 Hz :        ~
                           – at 0.1 I,   and at I,              I         1                  + 1.5 %
                                      b             b         |i
                           - at I.                            ; 0.5 induct .                 + 1.5 %
                    I i           b                           !I
    Wave form       jFor an increase of 10 % in                 i
    ( note 2 )      iharmonics of the third order
                    lin tne current wave :                    j
                    ; - at Tb                                 !           1                  + 0.8 %
                    î
                                                                !
    hagnetic in -For a cagnetic induction of                  jI  -          ••   -
    duction of      <0.5          at the reference fre- j
    external        jquency , under the cost unfa- |i
    origin (no-     jvourable conditions of phase |
    te 3 )          jand direction. :                           !
                                                                i .
 __                 I " to Jb           ~                       i         i                  + 3   %
                                                                i
    Order ef          !For a reversal of the direct             i
    phases for        jphase order :                      1 "i  s
    polyphase         !-
                      i from 0.5 I>,D to Imax- symmetr * ;                1                  + 1.5 %   -
    circuits "        ■
                                                                j        0.5                 + 2 . % ,
                      i
                        - to 0«5 1^» on one terminal                      1                  + 2   %
>
 ---pagebreak---                                     - 16 -
           Note 1 « For a given temperature , the value of the mean tempe­
                     rature coefficient . is determined for an area of 20 °C
                     chosen- within the,, range,"'Q - 4Q °C and centred, on this
                     temperature .                                   1: • i
          -Note 2 , When determining ..the variation of_ error as a function
                     of the wave form the harmonics content of the voltage
                     curve must remain less than 1 % , and the phase of the
                     harmonic of the third order inserted into the current
                  v curve must vary between zero and 360® .
          .Note 3 « The induction required is obtained at the centre of a
                   ; circular coil of a mean diameter of 1 m , of* square
                     section , of small radial thickness in relation to its
  •-    •     ,      diameter and pxQ.yi£ling. a magnetomotive force of *f00 A/tr.
           Effect of strong voltage surges of short duration
           The meter should be able to undergo for 0.5 seconds a current
           equal to 3Q times, . the bgisic current whenjthis does not exceed
           10 airps , 20 times the basic current when this is greater than
           10 amps .
           Th.e circuit in which the meter is placed ehould for practical
           purposes' be non-inductive , the voltage at -the terminals of the
           voltage circuit being the reference, voltage and the frequency-
           being 50 Hz ..                     . v. .    ■< .
           The voltage being maintained at the 'terminals of the meter ,
      .    the latter should be allowed to rest for sufficient time for it
           to return to the ambient temperature ( about 1 hour )..
                                                   '•                       i .
           A test should then be made at the reference voltage , at the
           reference frequency , with a current equal to the basic current
           and a power factor of 1 . . The variation in error shouid not
           exceed 1.5 % •          ■ J- '' ''
                                          • t         ;          >
5*5 *     Variation in the error due to the intrinsic heating
           The meter having been previously maintained under reference
           voltage for at least one hour without the circuits fbeing sup­
          plied with current is put into service under the. maximum cur­
           rent .                                                     • ,. ' .
          The error of the meter is measured under a power factor of 1
 ---pagebreak--- immediately after putting into service and then at intervals
sufficiently short to :permit correct plotting of the curve of
variation of error as a function of time .
The test must be continued for at least an hour , and at all
events until the variation noted over a period of 20 min is
not greater than 0.2 % .
The variation in the ; error due to the intrinsic heating measured
as indicated above must not be greater than 1 % .
Running without load
Under the conditions indicated in paragraph 5.2 ., the current
circuits of the meter being switched off , the- rotor should not
run free for any voltage value between 80 % and 110 % of the
reference voltage : the rotor may turn slightly , but should
make' less than one complete turn . In the case of an indica­
ting' device with drums , this specification is valid when only
one roll is engaged .
S tartina;                      - '  .   .
Under the conditions indicated in paragraph p. 2 ., the meter
passing a current equal to 0.5 % of the . basic current with a
power factor of one , should start cleanly and- continue to re­
volve . It' should be verified that the rotor definitely makes
a comple'te turn ,   in the case of an indicating device with
drums , this specification is valid for one or two drums
engaged..' ; ■ -
Agreement of the indicating device with - the reading' constant
of the meter                                -
The energy recorded by the indicating device is compared . with
that obtained by multiplying the corresponding number of revo­
lutions ; of the; disc by the constant of the meter .
The difference thus measured must not be greater than the
uncertainty of' measurement .
Margins of adjustment .                               '
A meter adjusted to conform to the present specifications
 ---pagebreak---                                       - 18 -
          should allow at least the following margins of adjustment :
          a ) Adjustment at - full , load : .
                  k % in the direction of increasing the speed of the rotor
        '     I
                  and 6 % in the direction of. reducing it for a current equal
                                    j        .   •
                  to half the maximum current , with the reference voltage , a
             • frequency of 50 Hz and a power factor of 1 .
          b ) Adjustment at slight load :
                  + k % of the variation of the rotor speed at 5. % of the
                  basic current 50 Hz frequency , the reference voltage and a
                  power factor of 1 .                 '
          c ) Adjustment when out of phase : ( if the meter is capable of
                  such adjustment )
                  + 1 % of the variation of the rotor speed for 'a power factor
                • of 0.5 ( inductive ) with a current equal to half the maximum
                  current , 50 Hz frequency and the reference voltage .
                           CHAPTER IV - TYPE APPROVAL      ' • ' . , . ..      ■
  r
          The EEC type approval of electrical energy meters will be
          issued in accordance with the provisions of the Council direc­
          tive of 26 July 1971 concerning the harmonization of legisla­
          tion in the Member States relating to common provisions of mea­
          suring instruments and methods of metrological control .
          Some of these regulations are specified in the present chapter .
6. '      Type approval
6.1 .     Procedure for type approval
                                                                      .< ' • i
6.1.1 .   Technical documents
          A request for type approval should include the following do­
          cuments :
          a ) A detailed description of the model , in particular with
                  regard to :
                  - the construction of the motor components ; . ^ U. ..
                                               /
 ---pagebreak---                                - - 19 -
             - the dimensions of the motor disc , the weight of the
              . rotor , and the manner of its suspension ; '
             - the construction of the braking device ;
             -  the functioning of the adjusting devices ;
             -  the type of temperature compensation-; • -
             -  the construction of the indicating device ;
             -  the construction of supplementary devices such as for
                changing the tariff etc.;'
             - the construction of the casing . .
        b ) A table giving the different combinations of basic current
             and reference voltage of meters of the given type and
           . showing for each combination :
             - the number of windings in the current and voltage cir­
                cuits as well as the diameter of the wires ( or their
                dimensions in section ) ; : ■
             - the constants j the number • of : teeth of the wheels con­
                nected with the indicating device , and : the decimal di­
                visions of the indicating device ;
             - the reference voltage and the basic current of the
                meter which has served as a reference for the dimen­
                sioning of the windings of the other meters ( reference
                meter ). ,
        c ) A . diagram .to show the internal and external electrical
             connections .                                ■ ■■•
        d ) A diagrammatic drawing of the whole meter , showing all
             the principal components .
6*1*2 . Presentation of meters 'Submitted for type approval
        A request for type' approval should be accompanied by the pre­
        sentation of three meters identical to the model .
        The competent authority may request the submission of addi­
        tional meters having different combinations of basic current
        and reference voltage , in order to ascertain in particular
        that certain of these combinations may be considered as be­
        longing to the same model and complying with the regulations
                                          r
        given an this chapter .
 ---pagebreak--- If the request is for the extension of the approval of a model
already approved , the metrological authority may demand the
submission of an additional " meter .
Examination for type approval
The meters submitted must conform to the technical specifica­
tions given in paragraphs 2 , 3 and U and to the metrological
specifications given in paragraph 5 »
However , in order to take into account the possible errors in
the means of calibration , it is permissible , when drawing the
graphs of error corresponding to Tables I and II , to move the
axis of abscissae parallel to itself by a value not exceeding
0.5       the same for all graphs . ,
On condition that the whole of the load curve is plotted not
only in the reference conditions but also in constant test
conditions , the meters submitted must also Satisfy the fol­
lowing conditions when they are symmetrically charged :
* the difference between the maximum and minimum values of
  the error expressed algebraically , between 0.1 1^ and Imax
  with a power factor of 1 , must be less than or equal to
f the difference between the maximum and minimum values of
  the error expressed algebraically , between 0.2 1^ and Iraax
  with a power factor of 0.5 inductive , must be less than
  or equal to 3 % •
Measuring points for type approval tests
When carrying out tests concerned with the metrological spe­
cifications giv^n in paragraph ,5 » r :Weasurements .should be made
at least for the. following points :
- for all the meters , multi-phase meters with balanced loads ,
  with a power factor of 1 :
  5 %j 10 % % 20 9?, . 50 % and 100 % of 1^ and every whole multi­
  ple of Ib up to imax5         ^                        ;
- for all meters » multi-phase meters with balanced loads , with
  a power factor of 0.5 ( inductive ), s
  10       20 # , 50 %% 100 % of I. and every whole multiple of
  I ,b upr to I max-':
 ---pagebreak---                            - 21 -
- for multi-phase meters with only 1 phase loaded %
  20 % . 50 % and 100 % of I ,b ,' 50 % I max and I max with a factor
  of 1 , and 1^ with a power factor of 0.5 ( inductive ). These
  tests are carried out successively in all the phases .
The effects of the magnitudes of influence are examined at
least for the following points :
- the influence of the ambient temperature for 0.1 1^, 1^ and
  *max (Powcr factor of 1 ), and I ( power factor of 0.5 inductive ) 5
- the influence of the position for 0.05         and     ( power factor
  of 1 );
- the influence of the voltage for 0.1 1^, 1^ and Imax ( power
  factor ef 1 );
- the influence of the frequency , of the wave form and of exter­
  nal magnetic fields for the points and under the conditions
  indicated in Table IV ;
- the influence of inversion of the phases ( multi-phase meters )
  for 0.5 Ii_. I -. and I
          . b* b          max'. with a power factor of 1 .and 0.5
  ( inductive ), for balanced loads , and for 0.5        with a power
  factor of 1 ( inductive ), with a single-phased load ( this last
  test to be repeated for each of the phases ).
The effect of strong voltage surges of short duration and the
influence of the intrinsic heating are determined as indicated
in paragraphs        and 5«5 * .
The, test of running without load is carried out with 80
100 % and 110 % of the reference voltage .
The starting test is carried out under the conditions given in
paragraph 5«7 »          _
The test of the indicating - device is carried out under the con­
ditions given in paragraph 5»& .-
The duration of th'e test must be sufficient for the uncertainty
of reading not to exceed + 0.2 % .
The reference torque , with the rotor stopped , of the meters
submitted and their intrinsic consumption ( voltage circuits for
the reference voltage and current circuits for the basic cur­
rent ) should also be measured .
 ---pagebreak---                                   - 22 -
6»k »    EEC type approval certificate
                                             I
         The descriptions , -plans and diagrams which accompany the EEC
         type approval certificate include :
         - a note describing the functioning of the meter ;
         - a comprehensive plan ( if possible from several angles , showing
           the arrangement and the connections of the components );
         - a plan of the motor component(s ) and its/their regulating
           devices ;               , . .
         • a plan of the braking       device and its regulation ;
         - a plan of the mobile parts ( diameter and thickness of the disc
           weight and torque of the rotor ) and of the manner of its sus­
           pension ( upper and lower bearings );
         " apian of the temperature compensating device ;
         - a plan of the indicating device ;
         - a side view of the casing , the base plate and the terminal
           housing ;
         - a connection diagram ;
         - a table of the characteristics of the voltage and current
           windings ( number of turns , cross-section of the wires 4 in­
           trinsic consumption ) for the various combinations of basic
           currents and reference voltage ;
         - a table showing the transmission wheels and the constants for
           these combinations ;
         - the variations in construction ( casing material , any devices
           for multiple tariff , remote indication device , anti-reversing
   . :     device etc « ) .
                     CHAPTER V - PRIMARY EXAMINATION
         The EEC primary examination of electrical energy meters will
         be carried out in accordance with the regulations in the Council
         directive of 26 July 197*1 concerning the harmonization of le­
         gislation in the Member States relating to common provisions ,
         measuring instruments and methods of metrological testing .
       ■ These , regulations are supplemented by the following particu­
         lar provisions :
 ---pagebreak---                                   - 23 -
 7.      Primary Examination
         The primary examination of electrical energy meters consists
         of acceptance ( or reception ) tests and examinations of confor­
         mity to the model .
 7.1 .   Acceptanee tests
         The acceptance tests of the meters guarantee their quality
         with regard to the points listed in section 7 • 1 • 1 • .
 7.1.1 . Nature of the acceptance tests
         (1 ) -  Dielectric quality
         (2) -   Mechanical quality , without opening the casing
         (3) -   Running without load
         (k) -   Starting
         (5 to   10 ) - Accuracy te.sts .
    -    ( 11 ) « "Examination of the constant
         ( 12 ) - Mechanical quality , ; with ' the casing open . .
         The tests ..should preferably be carried out in the above order ,
         as detailed in sections 7'*1»2 « and 7»1*3 «      "
7.1.2 .  Conditions qf the acceptance tests
         The tests' must . be carried out cn each meter ,, with the casing
         closed , except for certain mechanical qualities and if neces­
         sary for checking the indicating device .
         Note
         However , when the primary examination . takes place in the manu­
         facturer 's workshops , it nay be permissible to carry out the
         tests with the casing open , as long as the influence of the lid
         has first been seen to be negligible . Nevertheless , when che­
         cking dielectric qualities , the casings should be closed .
         Before any test , the meters must be supplied with electricity
         for at least half an hour at the reference voltage and with a
         current of about 0.1 1^, with a power factor of 1 • This allows
         the heating of the voltage circuit in advance , and also a check
         that the rotor turns freely .
         Tests Nos 3 to 11 should be carried out under the conditions
         given in Table III or Table V »
 ---pagebreak---                                                  - 2k
                                                 Table V
                                  1 .   11 11       1       I
      Magnitude of influence          Reference
                                      ;
                                                      value |i               Tolerance
      Ambient temperature                         23 °C                         + 2 °C ( 1 )   |
      Position                                 Vertical                         +  1°  .
      Voltage                         Reference voltage      !                  +  1.5 %
      Frequency                                   50 Hz                         +  0.5 %
                                                             I
      Voltage and current                     Sinusoidal    ! - Distortion factor up
      wave form                                                     to 5 %
      Magnetic induction of                                  i    . Induction not causing
      exterior origin at a'                       Kone              any variation in the er­
                                                             i
      frequency of 50 Hz                                            ror greater than + 0.3%
                                                             ιI     at 0,1' I, , for a power
                                                             ι
                                                              |     factor D of 1 ( 2 )
                                                             IL           L-
                         In addition , for three-phase          meters
      Phase Order                      Direct sequence
  .   Imbalance of the vol­
                                                  None
                                                                    As in paragraph 5»2 . e ),
      tages and currents (.3 )                                      replacing 1 % by 1.5 %
  ( 1 ) The tests may be carried out at a temperature outside the - range 21-25 °C ,
        but within the range 15-30 °C f as long as a correction is made in re­
        lation to the reference temperature of 23 °C by using the mean tempera­
        ture coefficient indicated by the manufacturer#
                                                                                                 l
! ( 2 ) See note 2 to Table III .
   ...            _   _  . . .
  ( 3 ) Except for tests with a single-phase load .
 ---pagebreak---                                         - 25 -
7.1 . 3 *      Results of ( or assent to ) acceptance
7.1 . 3.1 • ' Test of dielectric rigidity ( test n° 1 )
               The test of dielectric rigidity consists in applying an AG
               voltage of frequency 50 Hz and effective value 2 kV between
               all the terminals connected together and the flat metal sur­
               face on which the meter is: placed .
7.1.3.2 .      Mechanical qualities ( tests nos . 2 and 12 )
               The tests to be carried out regularly , with the casing closed ,
               are as follows :
               - apparent • good' condition of the casing and terminal plate :
                                                                        1
               - correct positioning of the dial ;
               -> presence of all the prescribed indications .
               The checks necessitating the opening of the casing are as
               follows , and should be carried out after the other tests on
             . five meters chosen at random , whatever the size of the batch
               of meters to be checked :
               - quality of the , surface protection , e.g ; of paint ;
               - gear ratios ;                       1
               - nature of the . gearing of the indicating device ;
               - quality of the soldering ;                        ,          '
               - tightness .of the screws ;-
               - absence of- filings and metallic dust ;
               - margins of adjustment .
7.1.3.3.'      Running without load ( test n° 3 )
               The meter being supplied with electricity at the reference '
               voltage , with a power factor of 1 , by a current, equal to
               0.06T 1^, the rotor must not complete a whole revolution.
7.1 . 3 «^.     Starting ( test n° *0 "
               The meter being supplied with electricity at the reference
                voltage , with a power factor of 1 , by a current equal to
                0.006 1^, the rotor should start up and make more than 1
                revolution .
 ---pagebreak---                                                    - 26 -
     7.1 . 3*5 »        Accuracy tests ( tests nos . 5 to 10 )
                        The accuracy tests should be carried out for the current va­
                        lues and power factors indicated in Table VI t without the
            (           need to wait for the thermal balance of the windings to be
                        reached .       If these tests are carried out under the conditions
                        given ill Table V , the maximum permissible errors , given in
                        Tables I and II , are increased to the values indicated in
                     -  Table VI ,
                                                  Table VI
                                                     !                        Load of  i    Maximum
                       Current
I Test No .
                        Value    !
                                     Power Factor       '  . . Meters     three-phase  | Permissible
I                                                                             Meters  1i    Errors
                  I
                                   I               1
       5          i 0.05 Ife I             1           . Single-phase     Balanced        ± 3.5 %
                                                                and                    I
                                                                                        ι
                                                          three-phase                  !
                                                                                      i
       6                 xb ■              1-                    fi
                                                                          ^ * '
                                                                                  it      +   2.5 %
                                                    j
                                                    !
                                                    ι
       7                 Xb          0.5 induct .                Tl    |      - , fl
                                                                                          +   3
                                                                       i
    8 and 9            ' Xb   "            1              three-phase     1 phase         +   3.5 %
                                                                          loaded (1
                                                                          test in 2
                                                                          of the
                                                                          phases )
  _              I                    "
      10                                   1              Single-phase    Balanced        +   2.5 %
                          max                                           I
                   i                                            and
                                                          three-phase                  i
                        The permissible limits of error must not be systematically
                        exploited in the same direction .
 ---pagebreak---                                             27 -
7.1 . 3.6 .     Check on the agreement of the indicating device with the
                reading constant of the meter ( test n° 11 )
                The check on the indicating device of a batch is effected
                either on the whole batch or on a sample of **0 meters chosen
                at random from a batch comprising up to 1000 units * When
                the check is made at the manufacturer 's it may be carried
                out with the 'casing open .
                The duration af the test and the method used must be chosen
                in such a way that the uncertainty of measurement does not
            •   exceed 2 % ,   When a meter in the sample exceeds the toleran-
                ceSj the check must be made on each unit in the whole batch .
                In addition"-; a " test "will be 'carried out on 'five meters with
                casing open with' an uncertainty of measurement not exceed­
                ing 0.5 $ .
7.1.3.7 . ! Uncertainty of measurement
                The quality of the . measuring instruments and; of the other
                apparatus used to c.arry out tests nos . 2 tof 9 must be such
                that the errors of measurement which can be attributed to
                them do not exceed in relative value :
                + O.k % with . a power factor of 1
                + 0.6 % with a power factor of 0.5 ( inductive ).
7*2 »           Examination for conformity to the model
7.2.1 . ,       Nature of the , examination for conformity to the model
                In order to determine whether the metrological qualitites
                of . the meters manufactured and " presented for primary exami­
                nation conform 'to the regulations given in this Directive ,
                an examination for conformity to the modeJ* should be carried
                out at intervals determined by the competent authority , on
                a meter chosen at random after the acceptance tests .
                This examination consists , at least , in the drawing up of
              " two graphs of error ,' one between 0.05 I ub and I max with a
                power factor of , ,
                                    1 , and the other between 0.1 I ,b and
                                                                       ,
                                                                           I max
                with a power factor of 0.5 ( inductive ) and , possibly , in any
                other test described in this Directive which may appear ne­
                cessary to the competent authority .
 ---pagebreak---                                       ~ 28 -
            Note
            When the manufacture of meters of a given model is regular , it
            is desirable that the frequency of the examination for confor­
            mity to the model should be geared to the volume of production .
                                              J ; '
            In addition , this procedure should be carried out each time
            any faults which ; seem systematic are discoverd during the ac­
            ceptance tests or during other tests .
7.2.2 .     Authority of the examination , for conformity to the model
            The results of the examination for conformity to the model must
            be consistent with the specifications given in Articles 2 , 3
            and 5 of this Directive . However , in order to take into
            account the possible errors arising f-rom the means of calibra-
     ■ -    tion and from the dispersal of output from the factory , it is
            permissible when drawing the graphs of -error - corresponding to
            Table I ( and possibly to Table II ), to move the axis of abscis­
            sae parallel to itself by a value not exceeding 0.5 %% the
            same for all the graphs . In addition , if a starting test is
            carried out , it should be under the conditions of paragraph
            7.1 .3 .^. ( current equal to 0.006 I^)»
            If the meter examined does not comply with these conditions ,
            the competent authority must carry out more frequent and pos­
            sibly more complete examinations for conformity to the model ,
            until it appears that the meters manufactured again comply
            with the requirements of this" Directive".
            If successive examinations" for conformity to the model show
            that the quality of manufacture cannot b6 improved in order
            to comply With the requirements of this Directive , the com­
            petent authority should revoke the type approval .
7.3 . -     Ratification marks and sealirig
   '                              .         *       ' 'T        * •' *
        , ' Meters which have successfully undergone the tests of the pri-
 .          mary examination shall be sealed .
            The seals shall include the marks of the EEC primary examina­
            tion and shall be affixed in such a way that it shall be impos­
            sible to remove the lid of the . meter , to gain access to the me­
            ter said braking components , the • pontrols , the moveable parts and
            the indicating device , without . damaging the primary ratification
            marks ..