ARCHIVESHISTORIQUES
DELACOMMISSION
COLLECTION RELIEEDES
DOCUMENTS "COM"
COM(73)276
Vol.1973/0043

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COMMISSION OFTHEEUROPEANCOMMUNITIES
COM(73)276final
Brussels,23February1973
ProposeddirectiveoftheCouncil
concerningtheharmonization oflegislationintheMemberStates
relatingtoelectricalenergymeters
(submittedtotheCouncilbytheCommission)
COM(73)276final

STATEMENT OFREASONS
I.GENERAL -OBSERVATIONS
Thepresent directive isanapplication ofArticle 100 oftheTreaty in
conjunction with theCouncil Directive of26July 1971 concerning the
harmonization oflegislation intheMember States relating tocommon provi -
aions ofj'measuring instruments andmethods ofmetrological testing (1).
Itsobject istoeliminate thetechnical barriers tointra-C©mmunity
trade afpresent existing intheelectrical energy ,meter sector asaresult
ofthe disparity between national legislations relating tothese meters
in'the -Member States . ' .
Acomparative examination ofthe .regulations applicable toelectrical'
energy meters has shown that the differences are not limited only tothe
technical pravisions relating toconstruction ,materials ,indication de­
vices andinscriptions ,but also tothe accuracy ,themethods ofmetrolo­
gical testing towhich these meters aresubjected before being marketed
and their utilization .
.Asimilar situation prevails asregards exchanges ,awing totheobliga­
tion upon manufacturers todiversify their production inorder toconform
with the regulations inforce intheMember State inwhich these meters
are tobeused ,and tosubmit torepeated tests performed indiffering
ways .
Asthe existing national legislations are justified bythelegitimate
concern twprotect consumer and .user ,their harmonization appears tobe
the only means ofeliminating ,the ;drawbacks arising from their divergence
and ofcreating thenecessary ,conditions for the establishment ofthe''
Common Market .
(1)Journal Officiel desCommunautés Européennes n°L202of6September 1971 »

Although theaimofthis directive ,ismainly metrological ,i.e. ,the
harmonization oftherelevant provisions ,theproblems ofmeter safety
have nontheless not been disregarded .The directive impeses onmeters
provisions designed toensure thecorrect functioning ofthemeter not
only from thestandpoint ofitsmeasuring qualities but also from that
ofsafety ofuse .Asregards theother safety aspects which are not
regulated inthepresent directive ,itmust ofcourse beborne inmind
that these aredealt with inthedirective already approvod .byvthe
Council relating toelectrical equipment destined tobeused within .cer­
tain voltage limits . ,, , • > ,•
Aftimportant discussion onacceptance test conditions took place between
the experts consulted ,theissue being whether these tests should be
carried outoneach met^r orstatistically ,byasampling method .
• r*
Thecountries which donot atpresent require theprimary examination are
reluctant 'toset uptheponderous andexpensive oontrol system ,which this
would entail .However ,some ofthe experts consulted said they could
"hot iacceipt statistical testing because atthepresent moment ,despite the
work inprogress ininternational organizations such astheInternational
Electrotechnical Commission orthe .European Committee for th%Coordina­
tion ofthe Electrical Standards ofMember Countries ofthe European
Community (CEKELCOM ),no .agreement has .yetbeen reached onsuch amethod *
The directive therefore presents amethod ofprimary individual examina­
tion .But theCommission isaware ofthe limitations ofthis solution ,
andhasundertaken topresent amodification ,ofthedirective inthis
sense .This proposed modification will -besubmitted as :soon .,aspossi­
ble forexamination totheCommittee forAdaptation toTechnical Pro­
gress for themeasuring instruments sector -, •

Asregards thelegal provision ,the first article defines the field of
application ofthe directive ,i.e. ,itlists the electrical energy me-'
ters defined inthe annex tothe directive .
Article 2stipulates that the electrical energy meters which can receive
the EECmarks and signs aredescribed inthe annex and that EEC approval
ofthemodel isrequired inall cases .
For theprimary .examination ,onthe ;other hand ,this article provides
that the test shall beimposed only where such aprovision exists for
national meters .This nuance isinserted inorder toallow -for the
existing situation incertain Member States ..Itshould benoted that
this solution has already been adopted asregards approval ofthemodel
inthedirective relating tolength measurements .
Article 3specifies that when electrical energy meters areprovided with
the EECmodel approval mark ,andwhere appropriate with the EECprimary
examination mark ,they nay beimported ,marketed andused asmeters sa­
tisfying the national provisions .
Theperiod oftime forintroduction ,fixed at18months asintheother
directives adopted inthemeasuring instruments sector ,isspecified in
Article k.Inaddition this article obliges Memeber States tocommuni­
cate totheCommission the text ofanyinternal laws which they may
adopt ,inthe field ofthepresent directive .
Article 5indicates that this directive isaddressed toall theMember
States .
II.SOLUTION BYHARMONIZATION
The solution byharmonization actually chosen iscalled optional ,like
that adopted formost ofthespecial directives inthemeasuring instru­
ment sector .The optional harmonization solution isproposed asanal­
ternative tothe solution oftotal harmonization inthe Council directive
relating tomeasuring instruments andmethods ofmetrological testing .

-4-
I^Thisoptionalharmonization meansthattheelectricalenergymeters
satisfyingthepresentDirectivecanbemarketedand.usedfreelyas
betweenMemberStatesinthesamewayaselectricalenergymeters
whichhavesatisfiedthenationaltestscanbemarketedandused
withineachoftheMemberStates,
HI.CONSULTATION 0?PARLIAMENT ANDOFTHEECONOMIC ANDSOCIALOCMTITTEE
Theopinionofthesetwobodiesappearsnecessarytoconformwiththe
provisionsofArticle100,para.2.Implementation ofthedirective's
'provisionswillnecessitatemodification ofthelawsofcertainMember
States. •
»

ΑΝΚΕΧ
tothe statement ofreasons for the proposed directive
onelectrical energy meters
Legislation inforce intheMember States relating toelectrical' etiergy
meters .
1.Belgium
-Royal decree of6August 1962 relating toelectrical energy meters .
-Ministerial decree of10August 1962 concerning model approval . '
2.German :/
-Lawonthemetrology andcalibration ofweights andmeasures (cali­
bration law -Eichgesetz )of11July 1969 .
-Regulation oncalibration (Eichordnung )intheversion ofregulation
*\kcconcerning themodification oftheregulation oncalibration .
3.France
-Decree of28December 1935 relating totheexamination ofelectrical
energy meters (Journal officiel of1January 1936 ).
-Order of29December 195^relating totheconstruction andapproval
oftypes ofelectrical energy meter (Journal officiel of9January 1955 )«
-Order of December 195^relating totheprimary examination ofnew
electrical energy meters (Journal officiel of9January 1955 ).
k.Italy
-Royal decree of11July 19^-1 -XIX -No.110^
-Reyal decree of11July 19^1 -XIX -K°1105
-Law of1July 1963 N°186
-Standard 13-2 ofsection N°1?8Edition XII-61 (CNR/CEI )
-Standard 38-1 ofsectien N°236Edition VII-68 (CNR/CEI )
-Standard 38-2 ofsection N°237Edition VII-68 (CNR/CEI )
-Publication K°53-111 of13February 1961(CNR/CEI )

Netherlands
-Law onmeasuring instruments of22April 1937 ,published inthe
Journal officiel NfH.527 .. ... -L,.
-Regulation onmeasuring instruments of29April 1939 *
-Royal decree of5February "1970 concerning electrical energy
meters .
-Ministerial decree of9May 1939 relating tomeasuring instruments .
Luxembourg
Nil .

Proposed directive oftheCouncil
concerning theharmonization oflegislation intheMember States
relating t©electrical energy meters
The Council ofthe European Communities ,
inview oftheTreaty establishing the European Economic Community ,and
inparticular itsArticle 100 ,
inview oftheCommission 'sproposal , t
inview ofthe opinion ofthe European Parliament ,
inview oftheopinion oftheEconomic andSocial Committee ,
considering that ,intheMember States ,the construction and also the
methods oftesting ofelectrical "en'et'gy "meters are the subject ofstrict
regulations which differ from oneMember State toanother and hence impede
trade inthese meters ;that aharmonization ofthese regulations is -there­
fore necessary ; ■ :
considering that thedirective oftheCouncil of26July 1971 ,concern­
ing theharmonization oflegislation in .theMember States relating toco^«-
iion .provisions .o£-,oeasuring instruments andmethods ofmetrological
testing has defined theprocedures forEEC approval ofthemodel and EEC
primary examination ;that inconformity with this directive itisneces­
sary tospecify thetechnical provisions for theconstruction andopera­
tion ofelectrical energy meters ;
considering that theabove directive also stipulates that particular di­
rectives may fixwhen conditions permit ,thedate atwhich each Member
State istoabrogate thenational provisions applicable toinstruments
similar tothose which satisfy the Coromunity provisions ;that inthe
present case itisnetyet permitted -,tofix this date :
HAS ADOPTED THEPRESEM "DIRECTIVE :

2•
Article 1
ι. ■ »■
Thepresent directive isapplicable toinduction meters ,incurrent use ,
with direct connection ,new ,with single ormultiple tariffs ,designed
tomeasure theactive power single-phase orthree-phase current at30Hz
frequency .
Article -2
_ .. *
The electrical energy meters which may begiven EECmarks and signs are
described inanAnnex tothis Directive .They shall kethesubject of
the EEC type approval .They shall not besubmitted totheEECprimary
t ■ i ,examination except where acorresponding check isprescribed fornatio­
nal electrical energy meters . ■■ « ■■:• ■ "
Article 3
Member States may not prevent ,prohibit orrestrict themarketing and
putting into operation ofelectrical energy meters bearing thesign of
EEC type approval andwhere appropriate ofthe EECprimary examination .
Article k
1.TheMember States shall put into force the laws ,regulations and admi­
nistrative action necessary forconformity tothepresent Directive
within 18months following notification ofitand^hall inform the
Commission immediately .
2.TheMember States shall take care .tocommunicate totheCommission the
test ofanyi-provisions ofinternal iawwhich they mayadopt inthefield
covered bythepresent Directive .
Article 5
This Directive isaddressed toallMember States .

ANNEX
,CHAPTER I-DEFINITIONS .
Definition ofcertain terms used inthe present Annex
Magnitude orfactor ofinfluence
Anymagnitude ,oranyphenomenon other than themeasured magni­
tude ,the effects ofwhich maymodify the result ofthemeasure­
ment ... .-
Variation oferror asafunction ofamagnitude ofinfluence
Difference ,between' the errors ofthe'meter when asingle magni­
tude ofinfluence assumes insuccession twospecified values .
Reference value ofamagnitude ofinfluence
Value ofthis magnitude asafunction ofwhich certain charac­
teristics ofthe meter are fixed .
Basic current (I.)
' 1 D
Value ofthe current asafunction ofwhich the values ofcer­
tain characteristics ofthe meter are fixed .
Maximum current (I ) . .max .■■ •
Value ©fcurrent uptowhich themeter should satisfy theprovi­
sions relating toaccuracy .
Distortion factor
Ratio ofthe effective valu£ oftheremainder obtained bysub­
tracting thefundamental factor from anon-sinusoidal alternating
magnitude ,totheeffective value ofthenon-sinusoidal magnitude
The 1distortion factor isusually expressed asapercentage .
Nominal speed ofrotation
TheValue ofthespeed ofrotation oftheroter ,under therefe­
rence conditions (section 5*2 .),forthebasic current and a
power factor of 1. *
Nominal torque
The value o-fthetorque exerted ontherotor atrest ,under the
reference conditions (section 5«2.),forthebasic current anda
pewer factor of 1.

1.9 Nominal insulation voltage
Thehighest value ,of .-the -voltage' -with respect tothe earth to
which the circuits ofameter can beraised innormal service .
1•10• Model ». -- . ..»• •-•
Designation used todefine all themeters with asingle tariff
ormultiple tariffs ,nadeby one and t-he earn® manufacturer Jto
'which correspond : ~v
-the same metrological properties ,
-uniformity ofconstruction ofthe parts which determine these
. qualities ,.. ........ .
-the same ratio between maximum current andbasic current ,
-various basic currents and various reference voltages .
Remarks
a)These meters aredesignated ,bythemanufacturer ,byoneormore
groupes either ofletters orofnumbers ,orofacombination of
letters andnumbers .Each model has one' designation only .
b)Themodel isrepresented bythesample meter /meters intended formo­
'>••'VW
delapproval tests ,thecharacteristics ofwhicff (basic currents and -
reference voltage )arechosen from among those appearing intheta­
bles proposed bythemanufacturer (section 6.1.1 .).
c.)..Inthecase ,ofspecial productions ,theproduct ofthenumber ofturns
.ofthe wind.ings.jand theintensity ofthebasic current ,may differ
from that .ofthesample meters representing themodel ..Thenumber
immediately above orbelow should be'chosen ,soasto .have awhole
number ofturns . ■... t
Asaresult ,o,fthis ,thenumber ofturns per voli ofthevoltage win­
dings pust no.tdiffer bymore than 20%from that' ofthesample meters
representing themodel . ,rc:-.
d)Theratio ofthehighest tothelowest nominal ©peed ofrotation of
the rotor ofeach meter ofthe same model must not exceed 1.5 *

CHAPTER II-TECHNICAL SPECIFICATIONS
Kechanical spécifications
General
The insulating materials used inthemeters must forpractical pur­
poses benon-hygroscopic and not easily inflammable . .
All theparts exposed tocorrosion under conditions ofusemust be
effectively protected against corrosion due toatmospheric in­
fluences .The protective 1layers must not besusceptible todete­
rioration during normal handling ,nor todamage byexposure tothe
air under the usual conditions ofuse .
Casing -
The casing ofthemeter must forpractical purposes bedust-proof .
This casing must beable tobelead sealed orsealed insuch a
way that theinternal components ofthemeter cannot beaccessible
until after the seals have been removed .
Meters forwhich the reference voltage ishigher than 250 volts
referred toearth ,and ofwhich the casing iscompletely orpartly
metallic ,must beprovided with acorrectly rated protective ter­
minal .
Windows
Ifthe casing ofthemeter isncit "transparent ,itmust include one
ormore windows forreading the indicator and observing themove­
ment ofthe rotor .These windows must becovered byplates of
transparent material which itmust beimpossible toremove without
breaking the seals .
Terminals -terminal plates
The terminals must begrouped inone ormore terminal plates ofsuf­
ficient mechanical strength .They must permit the jfixing ofrigid
conductors orofcables .
Itmust bepessible easily todisconnect ,thevoltage terminals
from the current input terminals .

Connection ofthe conductors tot.he terminals must bemade insuch
away asensure sufficient anddurable contact ,sothat there -is
norisk ofloosening orexcessive heating .The holes which are a
prolongation oftheterminal holes intheinsulating material must
belarge enough toallow the easy insertion oftheinsulation of
the conductors .
Note
Thematerial ofwhich the terminal plate ismade must satisfy the
test ofISOrecommendation R-75 (1958 ),section 6,foratempera­
ture of135 °C. . . u .'
J '
Terminal cover
The terminals ofthemeter must becovered byaterminal cover
which itmust bepossible toseal independently ofthe lid .
When themeter ismounted onitsboard ,itmust notbepossible to
reach the terminals without breaking the seals onthe terminal
cover .The terminal cover must therefore cover theupper part of
the terminal plate ,thescrews which hold theconductors inthe
terminals and ,ifnecessary ,asufficient length ,oftheconnecting
conductors and their insulation .
Indicating device
The indicating device may consist ofdrums orpointers .
Theunit oftheindicating device must bethekilowatt hour .
Inthe case ofindicating devices with drums ,the unit must be
stated near thedrum assembly .
Inthecase ofindicating devices with pointers ,there should be^
marked near theunit dial :1kWh/div,~ andalongside theother
dials ,thenumber ;of'kilowatt' hours corresponding toonedivision ,
i.e. 10;100 ;1*,000 . ; , -
,Λ ·. .·: * ■ι
»
Thedial ofpointer-type indicating devices ,orthedrum of
drum-type indicating devices ,which indicates one-tenth ofthe
reading unit must beframed -orcoloured .

-5-
The dial ,orcontinuous rotation drum ,indicating thelowest values
must include ascale of100equal divisions ,orany other arrange­
ment giving similar accuracy ofreading .
Theindicating devicfe irtust' beable torecord ,from zero ,fora
minimum of1,500 hours ,theenergy corresponding tothemaximum
current atthe reference voltage and apower factor ofone .
%
All theindications appearing ontheindicating device must be
indelible and easily legible .
2.7•Direction ofrotation ofthe rotor
The front part oftherotor ,for anobserver placed infront ofthe
meter andlooking atit,must move from left toright .This di­
rection must beindicated byafixed arrow ,easily .visible and
.-•^indelibler "
The edge ,orthe edge and the top ofthe disc ,must carry amain
mark with awidth ofbetween one-twentieth and one-thirty -fifth
ofthe circumference ofthe disc ,allowing thenumber ofrevolu­
tions tobecounted .
The disc may also carry marks permitting stroboscopic orother
tests tobemade .These marks must not impair the use ofthe
main mark when this isused forphoto-electric counting ofthe
numb.er ..of„revolutions .ofthe -disc *.
3• Electrical spécifications .–
3.1 .Value ofthe maximum current
Themaximum current must beawhole multiple ofthe basic current .
3.2 .Consumption ofthe circuits
3.2.1 .Voltage "c'irciï'its ""
The power consumed byeach voltage circuit ofameter must not
exceed 2Wand 8VAforthereference voltage andreference fre­
quency .
3.2.d.,Current circuits .
The -apparent power absorbed byeach current circuit must not
r -exceed 2.5VAforthe basic current ,thereference frequency and
temperature . ~

-6
3«3 »Heating
,Intheusual conditions ofuse ,the 1windings andinsulators
should notreach atemperature liable toendanger the functio­
ning ofthemeter .This aimwill beachieved if :theinsulating
materials preserve their dielectrical qualities during thefol­
lowing test : .T.J•
This test must becarried out for .twohours onameter not expo­
sed todraughts ortodirect sunlight ,under the following con­
ditions :
-current circuits :maximum current
-voltage circuits and auxiliary circuits
connected upinservicie for aperiod
greater than their thermic time constant ;: ;1.2times the re­
ference voltage .
After this text ,theincrease intemperature tofthemeter
windings and the external surface ofthe casing ,whether ,metallic
– orinsulating ,must not exceed thevalues indicated inthe table
--below .Themeter must notshow anydamage andmust satisfy the
ir.sulation tests insection
Increase oftemperature «o.tofthewindings and thecasing
„ . - , !
jParts ofthemeter
:|Zlxt *C
Windings Class A
Windings Class E
• I-»5 '-
80
jExternal surface of
ithecasing25
The temperatures ofthewindings aredetermined byaddiftg to -the '
ambient temperature theheating determined bytheresistance varia
tion method (see Publication 28ofthe International .Electrotechni
calCommission 's"International Specifications for aCopper -type
Annealing ").
Themaximum values oftheheatings mentioned inthetable cor­
respond ,foranambient temperature ofkO°C,tothemaximum tem­
perature fixed byPublication 85oftheI.E.C.

Insulation tests
The insulation ofall the circuits ofameter must bearranged
so ,asnot only toallow ittofunction correctly ,but also to
ensure suitable protection against the danger .ofelectric shock
when themeter isinnormal service ,orinconditions ofacci­
dental overload .
Th£insulators must have asuitable dielectrical rigidity and
offer sufficient resistance tomechanical stresses topreserve
their qualities permanently .
I ■-:
Thfinsulation quality ofthemeter circuits will beverified by
-tests atimpulse voltage , ...
-the dielectrical rigidity test .
General conditions for the insulation tests
The tests are carried out onnew meters innormal conditions of
use ,i.e. ,themeter fully mounted ,the casing closed and the
terminal cover inplace .
During the test ,theinsulation quality must -not bealtered by
thepresence of.dus.t orabnormal humidity . . .
Inthe absence ofcontrary specifications ,thenormal 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 atimpulse voltage
The -tests atimpulse voltage areprovided inorder todetermine
the .ability ofthemeter towithstand .without damage excess vol­
tages ofshort duration but very high value .
Characteristics ofthe generator
The impulse voltage isproduced byanapparatus inwhich acer­
tain number ofcondensers are charged inparallel byaconti­
nuous voltage source ,then discharged inseries inacircuit in­
cluding .themeter .The impendances oftheparts ofthe circuit
must ,besuch that theimpulse tobeapplied inagiven test re­
mains invariable atallvoltages .

3»^«2»2.Formoftheimpulsevoltage
Thewaveformisthatofthenormalimpulsevoltage.Itisa
fullimpulsevoltagewithaconventional durationofthefront
of1.2^usandaconventionaldurationofuptothehalf-value
of50^us.
Itisdesignatedinwritingintheformof:impulsevoltage
1.2/50.
Thetolerances are:7
onthetimeofrise. .+30%
-onthetimeofdescent +20%
3.H.2.3»Peakvoltage
Thepeakvalue'oftheimpulsevoltageisj6.kV+5%
3Pointsofapplication oftheimpulsevoltage
Thexmpulsevoltagemuetbeappliedî
-betweentheterminalsofeachvoltagecircuity ..
-betweentheframeontheonehandandontheetherhandthe
terminalsofallthevoltageandcurrentcircuitsconnected
together,including-ifany-thoseauxiliarycircuitswhose
referencevoltageishigherthan40V(whenthecasingisin­
•(sulatingorhasaninsulatingbase,thistestshouldbemade
withthecasingopen)j, - ■
-inaddition,forthemeterswhosecasingisinsulatingorhas
aninsulatingbase,between,ontheonehand,alltheterminals
connectedtogetherasaboveand,ontheother,aconducting
foilsurrounding themeter,incontactwithaflatmetallic
surfaceonwhichreststhebaseofthemeter;thisconducting
foilmustbeconnectedtotheaccessibleconductingpartsof
thebaseandleaveaspaceofatthemost20mmaroundthe
terminals .
3.4.2.5^Testprocedureandconclusions '"'
Thetestvoltagemustbeappliedtentines,asindicatedabove,,
withoutinversionofpolarity.
Duringthetest,nodisruptivedischargemusttakeplace.
Afterthetest,themetermust,ontheonehand,satisfyallthe
specifiedcharacteristics and,ontheotherhand,,haveavaria­
tionoferrornotgreaterthan0.5%(uncertaintyofmeasurement )0

-9-
3.3* Test ofdielectrical rigidity
3.^.3*1 .Characteristics ofthesource ofsupply
-Frebuency ':50Hz+5%
-Wave form jpractically sinusoidal
-Voltage :variable 0-2kv
.-Power , :greater than 500 VA.•••
3•^•3*2 .Values andpoints ofapplication ofthe test voltage
The dielectrical rigidity test voltage ,atthe effective value ,
and thepoints ofapplication ofthe test voltage areindica­
ted inthe table below :
Test voltage Points ofapplication ofthe test voltage
i . ,
i
2kV --between ,onthe one hand ,the frame and ,onthe
'other hand :
a)each independent current circuit ;
b)each independent voltage circuit ;
c)each auxiliary circuit whose r.eference volta -
■geishigher than hOV;
d)each assembly ofvoltage andcurrent circuits
■normally connected together inside themeter ;
(when ,thecasing isinsulating orhas anin­
sulating base ,these tests should bemade with
:thecasing open );
-inaddition ,for themeters whose casing isin­
sulating orhas aninsulating base$ between ,on
theonehand ,allthecircuits (mentioned above
ina),b)and c))connected together ,and ,onthe
ether .hand ,aconducting foil placed inthe same
"conditions asthat described inparagraph 3*^«2.*f .
500 V !
]
i
j
!between ,onthe one hand ,the frame and ,onthe
other hand ,each auxiliary circuit whose reference
voltage isequal atthemost to *f0V(when theca­
sing isinsulating orhas aninsulating base ,this
test should bemade with thecasing open ).
Thehighest ®fthe !
twofollowing va- I
luesvs •?600 ,V I
-twice the refe­
rence voltage when
this ishigher
than 300 V. " :
1between thevoltage circuit and the current circuit
ofeach driving part normally connected together ,
after having temporarily suppressed this connection
for the duration ofthe test .

-10-
3»t-0*3 »Procedure for the dielectrical rigidity test p.nd conclusions
The dielectrical rigidity test voltage isincreased progressi­
vely forabout 30s •uptotheprescribed valul ,andmain­
tained atthis value -for60s»c–Itis .then-reduced progres­
sively ,and asquickly aspossible ,tozero .
The results ofthedielectrical rigidity test are'considered
satisfactory when' : ••
-during the test ,noabnormality occurs sUch as*:abnormal
variation oftheapplied voltage ,noise ,smell ,distortion etc *,
-after thetest ,themeter complies with allthespecifications ,
andthevariation intheerror isnotgreater than 0.5%
(uncertainty ofmeasurement ).
Indications tobeshown on""the "meters "" """ """ ""
4.1 , Marking plate'' '"' """ .•
Each meter must carry amarking plate which may beeither the
dial oftheindicating device oraplate fixed inside themeter .
I
The following indications must beshown there ,inanindelible
manner ,easily legible andvisible from outside :
a)themanufacture 'sidentification mark ortrade name :
b)thedescription ofthemodel :
c)thesign ofEECtype approval ofthemeter ;
d)thedescription ofthenumber andarrangement ofthemotor
components ,either inthe form single-phase two-wire ,three -
phase four-wire ,etc.,orusing symbols conforming with a.
standard harmonized atCommunity level ;
e)thereference voltage s""' '
f)thebasic current andthemaximum current ,intheform :
10-40 Aor10(kO)A:
g)thereference frequency 50Hz;
h)theconstant ofthemeter ineither ofthes'e forme "2 '
xVVh/tr orXtr/kWh
i)theserial number ofthemeter anditsyear ofmanufacture .
Themeter may also carry information astoitsplace ;ofmanu­
facture ,acommercial description ,aspecial serial number ,the
name ofthesupplier ofelectricity ,asign ofconf ormi-ty -toa
European standard and anindication relating torepairs carried
out .Except byspecial authorization ,anyother indication orin­
scription isprohibited .

-11
"4.2 . Connection diagram " .,;
Each meter must carry aneasily identifiable connection dia­
gram showing thecorrespondence between theconnecting ter­
minals and the various phases ofthe conductors tobeconnected .
CHAPTER III -METROLOGICA !;-SPECIFICATIONS
,5. Metrological spécifications -
5.1 . - ,Maximum errors
•Under thereference conditions -described inparagraph 5»2.,
single-phase meters andthree-phase meters with balanced loads
must notexceed theerrors indicated inTable I,andthree -
phase meters with single-phase loads (under balanced voltages )
must not exceed the errors indicated inTable II.
Table ;I
Value ofcurrent l Power factor . Max .tolerated errors
0.05 Ife 1 * ; +2.5%
[from 0.1LtoI:
I b max !1 +2% l
0.1 I. 0.5 inductive +2.5%
from 0.2 Ivto Ib max0.5 inductive I+2%
i ""
Table II
Value efcurrent Power factor Max .tolerated errors
0-2 Ib^I*Ib1 +3%
b^ max 1 I
i+k% |
*b
I : ;0.5 inductive +5%
I
Net e
The single-phase loading ofathree-phase meter must beunder­
stood asonly affecting one star voltage inasystem with four

conductors (oneofwhich isneutral )9rasingle composed vol­
tage inasystem with three conductors (without aneutral ).
Inevery case ,thecomplete system ofvoltages must remain
connected tothe meter .
Reference conditions
The tests for the determination ofthe errors and ofthe varia­
tions oferror asafunction ofthemagnitudes ofinfluence
must becarried outunder thefollowing reference conditions :
a)themeter must beclosed ,that isfitted -wit-h its lid' ;
b)inthecase ofindicating devices with drums ,only thedrum
which turns thefastest should beengaged ,even ifitis
not visible ; «
c)before anymeasurement ,thevoltage must .have been connected
for at ^.east onehour andthetesting currents must each be
adjusted byprogressively increasing ordecreasing values
and connected for asufficient time for the speed ofrota -/
tion oftherotor tobecome stabilised ;
Inaddition ,.forthree-phase meters
d)theorder ofthephases must correspond tothedirect se­
quence (0-4-8orR-S-T); ,■
e)thevoltages andcurrents must forpractical purposes be
balanced ,i.e. : , .. ,
-each ofthesimply .andcomposite voltages should not dif­
ferbymore than 1%from themean efthecorresponding
voltages ;
-each ofthe-currents in'the"*conductors should not differ
■ ■■ ■ ■. •) '
bymore the 1%.from the .mean of .these currents ;
-thephase displacements presented byeach ofthese cur­
rents with thecorresponding star voltage should not
differ between themselves bymore than 2°.v
Thereference values (with specified tolerances )ofthemagni­
tudes ofinfluence are indicated inTable III asfollows :

-Table III
Magnitude ofinfluence Reference value Tolerance
Ambient temperature Reference temperature indica­
ted;bythemanufacturer or,in
default *23°C+26C
Position Vertical position (note 1) +0*5%
Voltage Reference voltage +1%
Frequency 50Hz +0.5%
Wave form Voltages and currents ofsi­
nusoidal form forpractical
purposesDistortion factor
Inot exceeding J>%
Magnetic field Field ,theinfluence ofwhich isnot apprecia­
ble ,i.e. .'such that theresidual induction of
this field does not cause any variation ofthe
error ,asapercentage ,greater than +0.3%
(note 2)for :
single-phase meter :onthe one hand for acurr .
of0.1 lband apower factor of1and ,onthe
other hand ,for acurrent of0.2 It,and a
power factor of0.5 «
three-phase meter :for acurrent equal to
0.1 Iband apower facter of1.
Note 1.Adjusting verticality
a)When themeter hasthree mounting points ,itsposi­
tion isdetermined bytheheight oftheisosceles
triangle formed bythe three centres ofthese mounting
holes ;this height must bevertical .
b)When themeter allows ofanother method ofmounting ,
its position isdetermined ,for example ,bythe rear
plane ofthe frame ,which should bevertical ,and by
the lower part ofthe terminal plate ,which should be
horizontal .

}
-1*f
Note 2.Residual magnetic induction ofexternal origin
The test method tocarry out this check consists :
,– ""a)"forasingle-phas'e nfeteiv in'determining thedif-
i _ference between the.'.errors ofthem«ter -before --and
:after reversing the connections >ofthe current and
•»"Voltage circuits .Half this difference isthe value
..variation aoughtj .. - ---
b)1for athree-phase meter' ,indetermining theerrors
•"of"themet'er 'bysupplying 't"he <current andvoltage
circuits while permuting thephases three times by
120° inthe direct order ,ofsequence -.-
The difference between each ofthese errors and
their arithmetical mean i-a-the value -of -the varia­
tion sought .
?- • . . .
5.3* Effects of .themagnitude ofinfluenoo -- ~-
The variations inthe error are determined for each ofthe
magnitudes ofinfluence under the conditions indicated in
Table IV,all theother conditions asinsection 5.2 *being
observed .

-15
Table IV
!Magnitude of influence
I _ _Nature ofthe tests i
and conditions j
iPower !
|factor iI
Temperature
(note 1)
iI
From C.1IbtoLaax j
From0.2IbtoIaax j» I
|
1
;0»5induct .[Maximum value
Jofthemean tea-
j.perature coeffi -
icient
+C.1%/°C
+0.15% /°c
!
t
i
iMaximum permissi­
ble variation of
errors
Position For aninclination of3tothe
vertical inanydirection : |
-atG.C5 Ib • |1
-atIb I 1
j+3%
+1%
Voltage For avariation of+10%in
relation tothe reference
voltage :
-at0.1 Ib j
--from toI !
D ;?jc ji 1
! 1
i _ . -+1.5%
+1%
Frequency
IFor avariation of+5%as
against 50Hz : ~
–at0.1 I,and atI,b b |
-atI. ;
i b !I 1
i
;0.5 induct .
I+1.5%
+1.5%
Wave form jFor anincrease of10%in
(note 2) iharmonics ofthethird order
lintnecurrent wave : j
;-atTb !i
1 +0.8%
î
hagnetic in -Foracagnetic induction of j
duction of <0.5 atthereference fre- jexternal jquency ,under thecost unfa- |
origin (no-jvourable conditions ofphase
te3) jand direction .:
__ I"toJb~!
I- •• -
i
|
!
i .
i i+3%
Order ef
phases for
polyphase
circuits "
>!For areversal ofthe direct
jphase order : 1"
!-from 0.5 I>,toI -symmetr *
i D max
■
-to0«5 1^onone terminal
i »i
i
i
s
; 1
j0.5
1+1.5% -
+2.%,
+2%

-16-
Note 1«For agiven temperature ,thevalue ofthemean tempe­
rature coefficient .isdetermined for anarea of20°C
chosen -within the ,,range ,"'Q-4Q°Candcentred ,onthis
temperature . 1:•i
-Note 2,When determining ..thevariation of_error asafunction
ofthewave form theharmonics content ofthevoltage
curve must remain less than 1%,andthephase ofthe
harmonic ofthe third order inserted into the current
vcurve must vary between zero and360® .
.Note 3«Theinduction required isobtained atthe centre ofa
;circular coil ofamean diameter of 1m,of *square
section ,ofsmall radial thickness inrelation toits
•- • , diameter andpxQ.yi£ling .amagnetomotive force of*f00A/tr.
Effect ofstrong voltage surges ofshort duration
The meter should beable toundergo for 0.5 seconds acurrent
equal to3Qtimes ,.the bgisic current whenjthis does notexceed
10airps ,20times thebasic current when this isgreater than
10amps .
Th.ecircuit inwhich themeter isplaced ehould forpractical
purposes' benon-inductive ,thevoltage at -the terminals ofthe
voltage circuit being thereference ,voltage and the frequency -
being 50Hz .. .v..■<.
The voltage being maintained atthe'terminals ofthemeter ,
.the latter should beallowed torest for sufficient time for it
toreturn totheambient temperature (about 1hour )..
'• i.
Atest should then bemade atthereference voltage ,atthe
reference frequency ,with acurrent equal tothebasic current
andapower factor of1..Thevariation inerror shouid not
exceed 1.5%• ■J-''''
•t ; >
5*5 * Variation inthe error due tothe intrinsic heating
Themeter having been previously maintained under reference
voltage foratleast onehour without thecircuits fbeing sup­
plied with current isput into service under the .maximum cur­
rent . •,.'.
The error ofthemeter ismeasured under apower factor of1

immediately after putting into service andthen atintervals
sufficiently short to :permit correct plotting ofthecurve of
variation oferror asafunction oftime .
The test must becontinued for atleast anhour ,and atall
events until thevariation noted over aperiod of20min is
notgreater than 0.2%.
Thevariation inthe ;error due totheintrinsic heating measured
asindicated above must notbegreater than 1%.
Running without load
Under theconditions indicated inparagraph 5.2.,thecurrent
circuits ofthemeter being switched off ,the -rotor should not
runfree foranyvoltage value between 80%and110%ofthe
reference voltage :therotor may turn slightly ,butshould
make' less than onecomplete turn .Inthe case ofanindica­
ting' device with drums ,this specification isvalid when only
oneroll isengaged .
Startina ; - ' . .
Under the conditions indicated inparagraph p.2.,themeter
passing acurrent equal to0.5%ofthe .basic current with a
power factor ofone ,should start cleanly and -continue tore­
volve .It'should beverified that therotor definitely makes
acomple'te turn ,inthecase ofanindicating device with
drums ,this specification isvalid for one ortwo drums
engaged..' ;■-
Agreement ofthe indicating device with -the reading' constant
ofthe meter -
The energy recorded bytheindicating device iscompared ..with
that obtained bymultiplying thecorresponding number ofrevo­
lutions ;ofthe ;disc bytheconstant ofthemeter .
The difference thus measured must not begreater than the
uncertainty of'measurement .
Margins ofadjustment . '
Ameter adjusted toconform tothe present specifications

-18-
should allow atleast thefollowing margins ofadjustment :
a)Adjustment at -full ,load : .
k%inthedirection ofincreasing thespeed oftherotor
and6%inthedirection of .reducing itforacurrent equal
' I j . •
tohalf themaximum current ,with thereference voltage ,a
•frequency of50Hzand apower factor of1.
b)Adjustment atslight load :
+k%ofthevariation oftherotor speed at5.%ofthe
basic current 50Hzfrequency ,thereference voltage and a
power factor of 1. '
c)Adjustment when outofphase :(ifthemeter iscapable of
such adjustment )
+1%ofthevariation oftherotor speed for'apower factor
•of0.5 (inductive )with acurrent equal tohalf themaximum
current ,50Hzfrequency and the reference voltage .
CHAPTER IV-TYPE APPROVAL '•'.,... ■
r
The EEC type approval ofelectrical energy meters will be
issued inaccordance with theprovisions oftheCouncil direc­
tive of26July 1971 concerning theharmonization oflegisla­
tion intheMember States relating tocommon provisions ofmea­
suring instruments andmethods ofmetrological control .
Some ofthese regulations arespecified inthepresent chapter .
6. ' Type approval
6.1 . Procedure fortype approval
.< '• i
6.1.1 . Technical documents
Arequest fortype approval should include thefollowing do­
cuments :
a)Adetailed description ofthemodel ,inparticular with
regard to :
-theconstruction ofthemotor components ;.^U...
/

--19-
-thedimensions ofthemotor disc ,theweight ofthe
.rotor ,and the manner ofits suspension ; '
-the construction ofthe braking device ;
-thefunctioning oftheadjusting devices ;
-the type oftemperature compensation -; •-
-theconstruction oftheindicating device ;
-the construction ofsupplementary devices such asfor
changing the tariff etc.;'
-the construction ofthe casing ..
b)Atable giving thedifferent combinations ofbasic current
and reference voltage ofmeters ofthe given type and
.showing for each combination :
-thenumber ofwindings inthecurrent andvoltage cir­
cuits aswell asthediameter ofthewires (ortheir
dimensions insection );:■
-theconstants jthenumber •of :teeth ofthewheels con­
nected with theindicating device ,and :thedecimal di­
visions oftheindicating device ;
-thereference voltage and the basic current ofthe
meter which has served asareference for the dimen­
sioning ofthewindings oftheother meters (reference
meter ). ,
c)A .diagram .toshow theinternal andexternal electrical
connections . ■■■•
d)Adiagrammatic drawing ofthewhole meter ,showing all
the principal components .
6*1*2 . Presentation ofmeters 'Submitted fortype approval
Arequest fortype' approval should beaccompanied bythepre­
sentation ofthree meters identical tothe model .
The competent authority may request the submission ofaddi­
tional meters having different combinations ofbasic current
andreference voltage ,inorder toascertain inparticular
that certain ofthese combinations may beconsidered asbe­
longing tothe same model and complying with theregulations
r
given anthis chapter .

Iftherequest isfortheextension oftheapproval ofamodel
already approved ,themetrological authority maydemand the
submission ofanadditional "meter .
Examination for type approval
Themeters submitted must conform tothetechnical specifica­
tions given inparagraphs 2,3andUandtothemetrological
specifications given inparagraph 5»
However ,inorder totake into account thepossible errors in
themeans ofcalibration ,itispermissible ,when drawing the
graphs oferror corresponding toTables Iand II,tomove the
axis ofabscissae parallel toitself byavalue notexceeding
0.5 the same forall graphs . ,
Oncondition that thewhole oftheload curve isplotted not
only inthereference conditions but also inconstant test
conditions ,themeters submitted must also Satisfy the fol­
lowing conditions when they aresymmetrically charged :
*the difference between the maximum and minimum values of
theerror expressed algebraically ,between 0.11^andImax
with apower factor of 1,must beless than orequal to
fthe difference between the maximum and minimum values of
theerror expressed algebraically ,between 0.21^andIraax
with apower factor of0.5 inductive ,must beless than
orequal to3%•
Measuring points for type approval tests
When carrying outtests concerned with themetrological spe­
cifications giv^n inparagraph ,5»r:Weasurements .should bemade
atleast for the .following points :
-forallthemeters ,multi-phase meters with balanced loads ,
with apower factor of1:
5%j10%%209?,.50%and100%of1^andevery whole multi­
pleofIbuptoimax5 ^ ;
-forallmeters »multi-phase meters with balanced loads ,with
apower factor of0.5 (inductive ),s
10 20#,50%%100%ofI.andevery whole multiple of
I,uptoI :br max-'

-21-
-formulti-phase meters with only 1phase loaded %
20%.50%and 100%ofI,,50%I and I with afactorb' max max
of1,and1^with apower factor of0.5 (inductive ).These
tests arecarried outsuccessively inall thephases .
The effects ofthemagnitudes ofinfluence are examined at
least for the following points :
-theinfluence oftheambient temperature for0.11^,1^and
*max(Powcr factor of1),andI(power factor of0.5inductive )5
-theinfluence oftheposition for0.05 and (power factor
of1);
-theinfluence ofthevoltage for0.11^,1^andImax (power
factor ef 1);
-theinfluence ofthefrequency ,ofthewave form andofexter­
nal magnetic fields for the points andunder the conditions
indicated inTable IV;
-theinfluence ofinversion ofthephases (multi-phase meters )
for0.5 Ii_.I-.and I .with apower factor of1and 0.5
.b*b max' .
(inductive ),forbalanced loads ,andfor0.5 with apower
factor of1(inductive ),with asingle-phased load (this last
test toberepeated foreach ofthephases ).
The effect ofstrong voltage surges ofshort duration and the
influence ofthe intrinsic heating are determined asindicated
inparagraphs and 5«5 * .
The ,test ofrunning without load iscarried outwith 80
100%and110%ofthereference voltage .
The starting test iscarried outunder theconditions given in
paragraph 5«7 » _
The test ofthe indicating -device iscarried out under the con­
ditions given inparagraph 5»& .-
Theduration ofth'etest must besufficient fortheuncertainty
ofreading not toexceed +0.2%.
The reference torque ,with therotor stopped ,ofthe meters
submitted andtheir intrinsic consumption (voltage circuits for
thereference voltage and current circuits for the basic cur­
rent )should also bemeasured .

-22-
6»k » EECtype approval certificate
I
Thedescriptions ,-plans anddiagrams which accompany theEEC
type approval certificate include :
-anote describing thefunctioning ofthe meter ;
-acomprehensive plan (ifpossible from several angles ,showing
thearrangement andtheconnections ofthecomponents );
-aplan ofthemotor component(s )andits/their regulating
devices ; ,..
•aplan ofthebraking device anditsregulation ;
-aplan ofthemobile parts (diameter andthickness ofthedisc
weight andtorque oftherotor )andofthemanner ofitssus­
pension (upper andlower bearings );
"apian ofthe temperature compensating device ;
-aplan oftheindicating device ;
-aside view ofthe casing ,thebase plate and theterminal
housing ;
-aconnection diagram ;
-atable ofthe characteristics ofthevoltage and current
windings (number ofturns ,cross-section ofthewires 4in­
trinsic consumption )forthevarious combinations ofbasic
currents and reference voltage ;
-atable showing thetransmission wheels and theconstants for
these combinations ;
-thevariations inconstruction (casing material ,anydevices
formultiple tariff ,remote indication device ,anti-reversing
.: device etc «).
CHAPTER V-PRIMARY EXAMINATION
TheEECprimary examination ofelectrical energy meters will
becarried out inaccordance with theregulations intheCouncil
directive of26July 197*1 concerning theharmonization ofle­
gislation intheMember States relating tocommon provisions ,
measuring instruments andmethods ofmetrological testing .
■These ,regulations aresupplemented bythefollowing particu­
lar provisions :

-23-
7. Primary Examination
The primary examination ofelectrical energy meters consists
ofacceptance (orreception )tests andexaminations ofconfor­
mity tothe model .
7.1 . Acceptanee tests
The acceptance tests ofthe meters guarantee their quality
with regard tothe points listed insection 7•1•1• .
7.1.1 . Nature ofthe acceptance tests
(1)-Dielectric quality
(2)-Mechanical quality ,without opening thecasing
(3)-Running without load
(k)-Starting
(5to10)-Accuracy te.sts .
- (11)«"Examination ofthe constant
(12)-Mechanical quality ,;with 'thecasing open . .
The tests ..should preferably becarried out intheabove order ,
asdetailed insections 7'*1»2 «and 7»1*3 « "
7.1.2 . Conditions qfthe acceptance tests
The tests' must .becarried out cneach meter ,,with thecasing
closed ,except forcertain mechanical qualities and ifneces­
sary forchecking theindicating device .
Note
However ,when theprimary examination .takes place inthemanu­
facturer 'sworkshops ,itnay bepermissible tocarry out the
tests with thecasing open ,aslong astheinfluence ofthe lid
has first been seen tobenegligible .Nevertheless ,when che­
cking dielectric qualities ,the casings should beclosed .
Before any test ,the meters must besupplied with electricity
for atleast half anhour atthereference voltage andwith a
current ofabout 0.11^,with apower factor of1•This allows
theheating ofthe voltage circuit inadvance ,and also acheck
that the rotor turns freely .
Tests Nos 3to11should becarried out under the conditions
given inTable III orTable V»

-2k
Table V
Magnitude ofinfluence1.11 11 1 I
Reference value |
; iTolerance
Ambient temperature 23°C +2°C(1) |
Position Vertical +1° .
Voltage Reference voltage ! +1.5 %
Frequency 50Hz +0.5%
Voltage and current
wave formI
Sinusoidal !-Distortion factor up
to5%
Magnetic induction of
exterior origin ata'
frequency of50Hzi
Kone
i
ι
ι
I.Induction not causing
any variation inthe er­
rorgreater than +0.3%
Iat0,1' I,,forapower
|factor Dof1(2)
L L-
Inaddition ,forthree-phase meters
Phase Order Direct sequence
.Imbalance ofthe vol­
tages andcurrents (.3)NoneAsinparagraph 5»2 .e),
replacing 1%by1.5%
(1)Thetests maybecarried outatatemperature outside the -range 21-25 °C,
butwithin therange 15-30 °Cfaslong asacorrection ismade inre­
lation tothereference temperature of23°Cbyusing themean tempera­
ture coefficient indicated bythe manufacturer#
l
... _ _ . . .
!(2)Seenote 2toTable III .
(3)Except fortests with asingle-phase load .

-25-
7.1 .3* Results of (orassent to)acceptance
7.1 .3.1 • 'Test ofdielectric rigidity (test n°1)
The test ofdielectric rigidity consists inapplying anAG
voltage offrequency 50Hzand effective value 2kVbetween
all the terminals connected together and the flat metal sur­
face onwhich themeter is :placed .
7.1.3.2 .Mechanical qualities (tests nos .2and 12)
The tests tobecarried outregularly ,with thecasing closed ,
are asfollows :
-apparent •good' condition ofthecasing and terminal plate :
1
-correct positioning ofthe dial ;
->presence ofall theprescribed indications .
The checks necessitating theopening ofthe casing are as
follows ,and should becarried out after theother tests on
.five meters chosen atrandom ,whatever the size ofthebatch
ofmeters tobechecked :
-quality ofthe ,surface protection ,e.g ;ofpaint ;
-gear ratios ; 1
-nature ofthe .gearing oftheindicating device ;
-quality ofthesoldering ; , '
-tightness .ofthe screws ;-
-absence of-filings and metallic dust ;
-margins ofadjustment .
7.1.3.3.' Running without load (test n°3)
The meter being supplied with electricity atthe reference '
voltage ,with apower factor of 1,byacurrent ,equal to
0.06T 1^,therotor must notcomplete awhole revolution .
7.1.3«^. Starting (test n°*0"
Themeter being supplied with electricity atthereference
voltage ,with apower factor of1,byacurrent equal to
0.006 1^,therotor should start upandmake more than 1
revolution .

-26-
7.1 .3*5 »Accuracy tests (tests nos .5to10)
Theaccuracy tests should becarried outforthecurrent va­
lues andpower factors indicated inTable VItwithout the
( need towait for the thermal balance ofthewindings tobe
reached .Ifthese tests are carried out under the conditions
given illTable V,themaximum permissible errors ,given in
Tables Iand II,areincreased tothevalues indicated in
-Table VI,
Table VI
ITest No.
ICurrent
Value !Power Factor!
' ..MetersLoad of
three-phase
Meters 1i Maximum
|Permissible
i Errors
I
5 i0.05 IfeI 1
I 1
.Single-phase
and
three-phaseBalanced ±3.5%
ι
I
!
i
6xb ■1-
j
!fi it
^* '+2.5 %
7Xbι
0.5 induct . Tl |
i-,fl+3
8and 9
_ I'Xb "1 three-phase 1phase
loaded (1
test in2
ofthe
phases )+3.5%
10max
i"
1 Single-phase
and
three-phaseBalanced
I+2.5%
i
Thepermissible limits oferror must notbesystematically
exploited inthesame direction .

27-
7.1 .3.6 .Check onthe agreement ofthe indicating device with the
reading constant ofthemeter (test n°11)
The check onthe indicating device ofabatch iseffected
either onthewhole batch oronasample of**0meters chosen
atrandom from abatch comprising upto1000 units *When
thecheck ismade atthemanufacturer 'sitmay becarried
outwith the'casing open .
The duration afthe test and the method used must bechosen
insuch away that theuncertainty ofmeasurement does not
•exceed 2%,When ameter inthesample exceeds thetoleran -
ceSj thecheck must bemade oneach unit inthewhole batch .
Inaddition "-;a"test "will be'carried outon'five meters with
casing open with' anuncertainty ofmeasurement not exceed­
ing0.5$.
7.1.3.7 . !Uncertainty ofmeasurement
Thequality ofthe .measuring instruments and ;ofthe other
apparatus used toc.arry out tests nos .2tof9must besuch
that the errors ofmeasurement which can beattributed to
them donot exceed inrelative value :
+O.k%with .apower factor of1
+0.6%with apower factor of0.5 (inductive ).
7*2 » Examination for conformity tothe model
7.2.1 . , Nature ofthe ,examination forconformity tothe model
Inorder todetermine whether the metrological qualitites
of .themeters manufactured and "presented forprimary exami­
nation conform 'totheregulations given inthis Directive ,
anexamination for conformity tothe modeJ *should becarried
out atintervals determined bythe competent authority ,on
ameter chosen atrandom after the acceptance tests .
This examination consists ,atleast ,inthedrawing upof
"two graphs oferror ,one between 0.05 Iuand I with a' b max
power factor of 1,and the other between 0.1 I,and I
,, b , max
with apower factor of0.5 (inductive )and ,possibly ,inany
other test described inthis Directive which mayappear ne­
cessary tothe competent authority .

~28-
Note
When themanufacture ofmeters ofagiven model isregular ,it
isdesirable that thefrequency oftheexamination forconfor­
mity tothemodel should begeared tothevolume ofproduction .
J; '
Inaddition ,this procedure should becarried out each time
any faults which ;seem systematic arediscoverd during theac­
ceptance tests orduring other tests .
7.2.2 .Authority ofthe examination ,for conformity tothe model
Theresults oftheexamination forconformity tothemodel must
beconsistent with the specifications given inArticles 2,3
and 5ofthis Directive .However ,inorder totake into
account thepossible errors arising f-rom themeans ofcalibra -
■-tion and from thedispersal ofoutput from thefactory ,itis
permissible when drawing thegraphs of -error -corresponding to
Table I(andpossibly toTable II),tomove theaxis ofabscis­
saeparallel toitself byavalue notexceeding 0.5%%the
same forall the graphs .Inaddition ,ifastarting test is
carried out ,itshould beunder the conditions ofparagraph
7.1.3.^. (current equal to0.006 I^)»
Ifthemeter examined does not comply with these conditions ,
thecompetent authority must carry outmore frequent andpos­
sibly more complete examinations forconformity tothemodel ,
until itappears that themeters manufactured again comply
with therequirements ofthis "Directive ".
Ifsuccessive examinations "forconformity tothemodel show
that thequality ofmanufacture cannot b6improved inorder
tocomply With therequirements ofthis Directive ,thecom­
petent authority should revoke thetype approval .
7.3 .- Ratification marks and sealirig
' . * ''T *•'*
,'Meters which have successfully undergone thetests ofthepri-
. mary examination shall besealed .
Theseals shall include themarks oftheEECprimary examina­
tion andshall beaffixed insuch away that itshall beimpos­
sible toremove the lidofthe .meter ,togain access totheme­
ter saidbraking components ,the •pontrols ,themoveable parts and
theindicating device ,without .damaging theprimary ratification
marks ..