61557-5-2007

(1)

BRITISH STANDARD

BS EN

61557-5:2007

Electrical safety in low

voltage distribution

systems up to

1 000 V a.c. and

1 500 V d.c. —

Equipment for testing,

measuring or

monitoring of

protective measures —

Part 5: Resistance to earth

The European Standard EN 61557-5:2007 has the s

The European Standard EN 61557-5:2007 has the s tatus of atatus of a British Standard British Standard ICS 17.220.20; 29.080.01; ICS 17.220.20; 29.080.01; 29.240.0129.240.01 12&23<,1*:,7+287%6,3(50,66,21(;&(37$63(50,77('%<&23<5,*+7/$: 12&23<,1*:,7+287%6,3(50,66,21(;&(37$63(50,77('%<&23<5,*+7/$:

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This British Standard was This British Standard was published under the authority published under the authority of the Standards Policy and of the Standards Policy and Strategy Committee Strategy Committee on 29 June 2007 on 29 June 2007 © BSI 2007 © BSI 2007 ISBN 978 0 580 50858 5 ISBN 978 0 580 50858 5

National foreword

This British Standard was published by BSI. It is the UK implementation of This British Standard was published by BSI. It is the UK implementation of EN 61557-5:2007. It is identical with IEC 61557-5:

EN 61557-5:2007. It is identical with IEC 61557-5: 2007. It supersedes2007. It supersedes BS EN 61557-5:1997, which will be

BS EN 61557-5:1997, which will be withdrawn on 1 March 2010.withdrawn on 1 March 2010. The UK participation in its preparation was entrusted to Technical

The UK participation in its preparation was entrusted to Technical CommitteeCommittee PEL/85, Measuring equipment for electrical and electromagnetic quantities. PEL/85, Measuring equipment for electrical and electromagnetic quantities. A list of organizations represented on this committee can be obtained on A list of organizations represented on this committee can be obtained on

request to its secretary. request to its secretary.

This publication does not purport to include all the necessary provisions of a This publication does not purport to include all the necessary provisions of a contract. Users are responsible for

contract. Users are responsible for its correct application.its correct application.

Compliance with a British Standard cannot confer immunity from Compliance with a British Standard cannot confer immunity from legal obligations.

legal obligations.

Amendments issued since pub

Amendments issued since publicationlication Amd. No.

Amd. No. DateDate CommentsComments

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EUROPEAN STANDARD

_{EN 61557-5}

NORME EUROPÉENNE

EUROPÄISCHE NORM

March 2007

CENELEC

European Committee for

European Committee for Electrotechnical Standardization

Electrotechnical Standardization

Comité Européen de

Comité Européen de Normalisation Electrotechnique

Normalisation Electrotechnique

Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050

Central Secretariat: rue de Stassart 35, B - 1050 BrusselsBrussels

© 2007 CENELEC - CENELEC - All rights of All rights of exploitation in exploitation in any form any form and by and by any means any means reserved worldwide reserved worldwide for CENELEC for CENELEC members.members.

Ref. No. EN 61557-5:2007 E Ref. No. EN 61557-5:2007 E ICS

ICS 17.220.20; 17.220.20; 29.080.01; 29.080.01; 29.240.01 29.240.01 Supersedes EN Supersedes EN 61557-5:199761557-5:1997

English version

Electrical safety in low voltage distribution systems

up to 1 000 V a.c. and 1 500 V d.c.

-Equipment for testing, measuring or monitoring

Equipment for testing, measuring or monitoring

of protective measures

-Part 5: Resistance to earth

Part 5: Resistance to earth

(IEC 61557-5:2007)

Sécurité électrique dans les réseaux

de distribution basse tension

de 1 000 V c.a. et 1

de 1 000 V c.a. et 1 500 V c.c. -

500 V c.c.

-Dispositifs de contrôle, de mesure

Dispositifs de contrôle, de mesure

ou de surveillance de mesures

de protection

-Partie 5: Résistance à la terre

Partie 5: Résistance à la terre

(CEI 61557-5:2007)

Elektrische Sicherheit

in

in Niederspannungsn

Niederspannungsnetzen

etzen

bis AC 1 000 V und DC 1 500 V

--Geräte zum Prüfen,

Geräte zum Prüfen,

Messen oder Überwachen

von Schutzmaßnahmen

-Teil 5: Erdungwiderstand

Teil 5: Erdungwiderstand

(IEC 61557-5:2007)

This European Standard was approved by CENELEC on 2007-03-01. CENELEC members are bound to comply This European Standard was approved by CENELEC on 2007-03-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member.

application to the Central Secretariat or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions.

to the Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom.

Sweden, Switzerland and the United Kingdom.

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Foreword

The text of document 85/294/FDIS, future edition 2 of IEC 61557-5, prepared by IEC TC 85, Measuring

equipmen

equipment for

t for electrical and electromagn

electrical and electromagnetic quantities, was

etic quantities, was submitted to the

submitted to the IEC-CENELEC parallel vote

IEC-CENELEC parallel vote

and was approved by CENELEC as EN 61557-5 on 2007-03-01.

This European Standard supersedes EN 61557-5:1997.

The following changes were made with respect to EN 61557-5:1997:

–

– complete re

complete revision of the d

vision of the definitions;

efinitions;

–

– revision of so

revision of some requir

me requirements.

ements.

This standard is to be used in conjunction with EN 61557-1.

The following dates were fixed:

–

– latest date by w

latest date by which the EN ha

hich the EN has to be impleme

s to be implemented

nted

at national level by publication of an identical

national

national standard

standard or

or by

by endorsement

endorsement

(dop)

2007-12-01

–

– latest date by

latest date by which the natio

which the national standar

nal standards conflicting

ds conflicting

with

with the

the EN

EN have

have to

to be

be withdrawn

withdrawn

(dow)

2010-03-01

Annex ZA has b

Annex ZA has been add

een added by CENELEC

ed by CENELEC..

_______

__________

___

Endorsement notice

The text of the International Standard IEC 61557-5:2007 was approved by CENELEC as a European

Standard without any modification.

_______

__________

___

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– 3 – 3 – – EN 61557-5:2007EN 61557-5:2007

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ELECTRICAL SAFETY IN LOW VOLTAGE DISTRIBUTION SYSTEMS

UP TO 1 000 V a.c. AND 1 500 V d.c. –

EQUIPMENT FOR TESTING, MEASURING OR MONITORING

OF PROTECTIVE MEASURES –

Part 5: Resistance to earth

1 Scope

This part

This part of Iof I EC EC 61557 specifies 61557 specifies the requirements for the requirements for equipment for equipment for measuring earthmeasuring earth resistance using an a.c. voltage.

resistance using an a.c. voltage.

2 2 Normative

Normative references

references

The following referenced documents are indispensable for the application of this document. The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited

For dated references, only the edition cited applies. For undated references, the latest editionapplies. For undated references, the latest edition of the referenced document (including any

of the referenced document (including any amendments) applies.amendments) applies. IEC

IEC 61010-1:200161010-1:2001,, Safety requirements for electrical equipment for measurement, control,Safety requirements for electrical equipment for measurement, control, and laboratory use –

and laboratory use – Part 1: General requirements Part 1: General requirements

IEC 61557-1,

IEC 61557-1, Electrical safety in low voltage distribution systems up to 1 000 V a.c. and Electrical safety in low voltage distribution systems up to 1 000 V a.c. and 1

1 500 500 V d.c. V d.c. – Equipment for – Equipment for testing, measuring or testing, measuring or monitoring of protective monitoring of protective measures – measures – Part 1:

Part 1: General requirements General requirements

3 3 Terms

Terms and

and definitions

definitions

For the purposes of

For the purposes of this document, the this document, the definitions given in definitions given in IEC IEC 61557-1 and the following61557-1 and the following definitions apply.

definitions apply.

3. 3.11

series interference voltage series interference voltage

extraneous voltage superimposed on the measuring voltage extraneous voltage superimposed on the measuring voltage

3. 3.22

auxiliary earth electrode auxiliary earth electrode

additional earth electrode for a

additional earth electrode for a current required for the purpose of current required for the purpose of measurementsmeasurements

3. 3.33

auxiliary earth electrode resistance auxiliary earth electrode resistance

R R HH

resistance of an additional earth electrode through which current flows that

resistance of an additional earth electrode through which current flows that is required for theis required for the purpose of measurements purpose of measurements 3. 3.44 probe probe

additional earth electrode used as

additional earth electrode used as a probe for a probe for sampling potentials during measurementssampling potentials during measurements

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– 5 – 5 – – EN 61557-5:2007EN 61557-5:2007 3. 3.55 probe resistance probe resistance R R SS

earth electrode resistance of an additional earth electrode used as a probe for sampling earth electrode resistance of an additional earth electrode used as a probe for sampling potentials during measurements

potentials during measurements

4 Requirements

The following requirements as well as those given in

The following requirements as well as those given in IEC 61557-1 shall apply.IEC 61557-1 shall apply.

4.

4.11 The output voltage present across the terminals E and H shall be an a.c. voltageThe output voltage present across the terminals E and H shall be an a.c. voltage without a d.c. component.

without a d.c. component.

The frequency and the waveform shall be chosen so that electrical interference, particularly The frequency and the waveform shall be chosen so that electrical interference, particularly from installations operating with system frequency, will not adversely influence the from installations operating with system frequency, will not adversely influence the measurement result to an excessive

measurement result to an excessive degree.degree.

4.2

4.2 If the influence of interference voltages from distribution systems as a.c. currents or asIf the influence of interference voltages from distribution systems as a.c. currents or as d.c. currents exceeds the requirements of 4.3, this shall be stated by the manufacturer in the d.c. currents exceeds the requirements of 4.3, this shall be stated by the manufacturer in the operating instructions.

operating instructions.

4.3

4.3 The maximum percentage operating uncertainty within the measurement range to beThe maximum percentage operating uncertainty within the measurement range to be marked or stated shall not exceed ±30 % with the measured value as fiducial value, as marked or stated shall not exceed ±30 % with the measured value as fiducial value, as determined in accordance with Table 1.

determined in accordance with Table 1.

Table 1 –

Table 1 – Calculation of operating uncertaintyCalculation of operating uncertainty

Intrinsic uncertainty or Intrinsic uncertainty or influence quantity influence quantity Reference conditions or Reference conditions or specified operating range specified operating range

Designation Designation code code Requirements Requirements or test in or test in accordance with the accordance with the

relevant parts of relevant parts of IEC 61557 IEC 61557 Type of Type of test test Intrinsic uncertainty

Intrinsic uncertainty Reference conditionsReference conditions AA Part Part 5, 5, subclause subclause 6.1 6.1 RR Position

Position Reference position ± 90°Reference position ± 90° E E 11 Part Part 1, 1, subclause subclause 4.2 4.2 RR

Supply voltage

Supply voltage At At thth e e lili mimi ts ts stst atat ed ed by by thth ee manufacturer

manufacturer

E

E 22 Part Part 1, 1, subclausessubclauses

4.2, 4.3 4.2, 4.3

R R Temperature

Temperature 0 0 °C °C and and 35 35 °C°C E E ₃₃ Part Part 1, 1, subclause subclause 4.2 4.2 TT Series interference

Series interference voltage

voltage

See 4.2 and 4.3

See 4.2 and 4.3 E E ₄₄ Part Part 5, 5, subclausessubclauses 4.2, 4.3 4.2, 4.3 T T Resistance of the Resistance of the probes and auxiliary probes and auxiliary earth eletrodes earth eletrodes

0 to 100

0 to 100 ××R R _A_Abutbut≤≤50 k50 kΩΩ E E 55 Part Part 5, 5, subclause subclause 4.3 4.3 TT

System

System frequency frequency 99 99 % % and and 101 101 % % of of the the nominalnominal frequency

frequency

E

E 77 Part Part 5, 5, subclause subclause 4.3 4.3 TT

System

System voltage voltage 85 85 % % and and 110 110 % % of of the the nominalnominal voltage

voltage

E

E ₈₈ Part Part 5, 5, subclause subclause 4.3 4.3 TT Operating uncertainty

Operating uncertainty

)) 1,15

1,15

((AA E E ₁₁22 E E ₂₂22 E E ₃₃22 E E ₄₄22 E E ₅₅22 E E ₇₇22 E E ₈₈22 B

B ==±± ++ ++ ++ ++ ++ ++ ++ Part Part 5, 5, subclause subclause 4.3 4.3 RR

A

A = = intrinsic intrinsic uncertaintyuncertainty E

E _n_n = variations= variations R

R = routine = routine testtest T

T = = type type testtest

[ [ ]]

B B % % = = ±± B B fiducial value fiducial value ×× 100 %100 %

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The operating uncertainty shall apply under the rated operating conditions given in The operating uncertainty shall apply under the rated operating conditions given in IEC 61557-1 and the following:

IEC 61557-1 and the following: –

– ininjecjec tition on of of seseriries es intint erferf ereerencnce e vovoltltageages s wiwith th sysyststem em frfrequequencenc ies ies of of 400 400 HzHz, , 60 60 HzHz, , 50 50 HzHz,, 16

1622//33 Hz or with d.c. vHz or with d.c. v oltage respectively across the terminals E (ES) and S or to the oltage respectively across the terminals E (ES) and S or to the earthearth

resistance loop. The r.m.s. value of the series interference voltage for equipment with resistance loop. The r.m.s. value of the series interference voltage for equipment with auxiliary probes shall

auxiliary probes shall be 3 be 3 V. For V. For equipment using current equipment using current clamps, the clamps, the presence of presence of interfering disturbances shall be clearly indicated, if the influence quantity will exceed the interfering disturbances shall be clearly indicated, if the influence quantity will exceed the specified value of the variation

specified value of the variation E E 44 and of operating uncertainty;and of operating uncertainty;

–

– resres isistantan ce ce of of ththe ae a uxiuxi liliary ary earear th th elelectect rodrode ae a nd nd of of the the proprobesbes : : 0 0 to to 100100 ×× R R _A_A butbut ≤≤ 50 50 kkΩΩ;; –

– sysyststem em vovoltltageages s betbet weewee n n 85 85 % % and and 110 110 % % of of ththe e nomnomininal al volvol tagtag e e and and betbet weewee n n 99 99 % % andand 101 % of the nominal system frequency for measuring equipment with a mains supply 101 % of the nominal system frequency for measuring equipment with a mains supply and/or measuring equipment deriving its output voltage directly from the distribution and/or measuring equipment deriving its output voltage directly from the distribution system.

system.

4.4

4.4 The measuring equipment shall be capable of determining whether the maximumThe measuring equipment shall be capable of determining whether the maximum permissible resistances of the probes and auxiliary earth electrodes are exceeded.

permissible resistances of the probes and auxiliary earth electrodes are exceeded.

4.5

4.5 No hazardous touch voltages No hazardous touch voltages shall appear during the measurements.shall appear during the measurements. This can be achieved by a

This can be achieved by a suitable design of the source for suitable design of the source for the output voltage by:the output voltage by: –

– lilimitmit ining g ththe e opeopen-cn-c ircirc uit uit valval ue ue of of ththe e outout put put vovoltltage age to to an an r.r.m.m.s. s. valval ue ue of of 50 50 V V or or a a peapeakk value of 70 V;

value of 70 V;

NOTE

NOTE The open-circuit voltage during measurements in agricultural plants should not exceed an r.m.s. valueThe open-circuit voltage during measurements in agricultural plants should not exceed an r.m.s. value of 25 V or a peak value of 35 V.

of 25 V or a peak value of 35 V.

–

– lilimitmit ining g ththe e r.r.m.m.s. s. (pe(peakak) ) vavalue lue of of ththe e shosho rtrt-ci-ci rcrcuit uit cucurrerrent nt to to 3,3,5 5 mA mA (5 (5 mAmA) ) whwhen en thethe value of the voltage exceeds 50 V

value of the voltage exceeds 50 V (70 V) or 25 V (70 V) or 25 V (35 V).(35 V).

When no compliance with the above condition exists, then an automatic disconnection of When no compliance with the above condition exists, then an automatic disconnection of the measurement process shall operate within a time period permissible according to the measurement process shall operate within a time period permissible according to Figure 1 of IEC 61010-1.

Figure 1 of IEC 61010-1.

4.6

4.6 The user shall not be exposed to a voltage exceeding the permissible touch voltageThe user shall not be exposed to a voltage exceeding the permissible touch voltage and the measuring equipment shall recover within specification, when any plug or socket of and the measuring equipment shall recover within specification, when any plug or socket of the measuring equipment, intended for connection to the distribution system’s power supply the measuring equipment, intended for connection to the distribution system’s power supply is connected to 120 % of

is connected to 120 % of its nominal voltage. Protective devices shall not be its nominal voltage. Protective devices shall not be activated.activated.

5 5 Marking

Marking and

and operating

operating instructions

instructions

5.1 Marking

In addition to the marking in accordance with IEC 61557-1, the following information shall be In addition to the marking in accordance with IEC 61557-1, the following information shall be provided on the measuring equipment.

provided on the measuring equipment.

5.1.1

5.1.1 MeasuremenMeasurement range within t range within which the maximum operating uncertainty applies.which the maximum operating uncertainty applies.

5.1.2

5.1.2 Frequency of the output voltage.Frequency of the output voltage.

5.1.3

5.1.3 Designation of the terminals (as far as Designation of the terminals (as far as applicable):applicable): –

– E: E: terter minmin al al fofor tr t he he earear th th eleelectctrodrode;e; –

– ESES: : terter minmin al al fofor r the the proprobe be plplaceace d nd nearear est est to to the the earearth th eleele ctctrodrod e;e; –

– S: S: terter minmin al al fofor a r a proprobe;be; –

– H: H: tetermirmi nal nal for for ththe ae a uxiuxi liliary ary earear th th eleelectctrodrode.e.

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– 7

– 7 – – EN 61557-5:2007EN 61557-5:2007

5.2

5.2 Operating Operating instructionsinstructions

The operating instructions shall state the following in addition to the statements in The operating instructions shall state the following in addition to the statements in IEC 61557-1.

IEC 61557-1.

5.2.1

5.2.1 The range of applications (e.g. for agricultural plants or others) for the equipment for The range of applications (e.g. for agricultural plants or others) for the equipment for measuring earth resistance.

measuring earth resistance.

5.2.2

5.2.2 If applicable, the influence of series interference voltages that are larger than theIf applicable, the influence of series interference voltages that are larger than the values stated under 4.3.

values stated under 4.3.

5.2.3

5.2.3 A statement relating to A statement relating to the correct operation of tthe correct operation of t he hand-driven generator (if provided).he hand-driven generator (if provided).

5.2.4

5.2.4 The designations of terminals when different from 5.1.3.The designations of terminals when different from 5.1.3.

6 Tests

In addition to IEC 61557-1 the following tests

In addition to IEC 61557-1 the following tests shall be executed.shall be executed.

6.1

6.1 The operating uncertainty shall be determined in accordance with Table 1. In thisThe operating uncertainty shall be determined in accordance with Table 1. In this process, the intrinsic uncertainty shall be determined under the following

process, the intrinsic uncertainty shall be determined under the following reference conditions:reference conditions: –

– nomnom inainal l vavalue lue of of the the supsupplply y vovoltltageage;; –

– nomnom inainal l r.pr.p .m. .m. of of the the hanhand-dd-dririven ven gengeneraera tor tor whwhen en usused ed as as a sa s uppupp lyly;; –

– nomnom inaina l l frefre quequencncy y of of ththe e powpow er er supsup ply ply in in the the cacase se of of maimai ns-ns- opeoperatrat ed ed meameasusurinrin gg equipment according to 4.3;

equipment according to 4.3; –

– refref ereerencnce te t empemperaeratuture re 23 23 °C°C ±± 2 °C;2 °C; –

– refref ereerencnce pe p osiosi tition on in in acaccocordardancnce we w itith th t he he manman ufaufa ctctureure r's r's ststateate menment;t; –

– resres isistatancence s s of of proprobes bes and and auxaux ililiaiary ry earear th th eleele ctctrodrod es es 100100 ΩΩ;; –

– ininteterferfe renrence ce volvol tatage ge 0 V0 V ..

The operating uncertainty thus evaluated shall not exceed the limits specified in The operating uncertainty thus evaluated shall not exceed the limits specified in 4.3.4.3.

6.2

6.2 A check as to whether the conditions for the open-circuit voltage, short-circuit currentA check as to whether the conditions for the open-circuit voltage, short-circuit current and disconnect delay stated under 4.5 are met in each of the measurement ranges

and disconnect delay stated under 4.5 are met in each of the measurement ranges (routine (routine test).

test). 6.3

6.3 A check as to whether exceeding the permissible maximum resistances for probes andA check as to whether exceeding the permissible maximum resistances for probes and auxiliary earth electrodes is indicated

auxiliary earth electrodes is indicated (type test).(type test). 6.4

6.4 The overload protection in accordance with 4.6 shall be testedThe overload protection in accordance with 4.6 shall be tested (type test),(type test), when anywhen any plug or socket of the measuring equipment, intended for conncetion to the distribution plug or socket of the measuring equipment, intended for conncetion to the distribution system’s power supply is connected to 120 % of its nominal voltage. Protective devices shall system’s power supply is connected to 120 % of its nominal voltage. Protective devices shall not be activated.

not be activated.

6.5

6.5 Compliance with the tests in Compliance with the tests in this clause shall be this clause shall be recorded.recorded.

––

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Annex ZA

(normative)

Normative references to

Normative references to international publications

international publications

with their corresponding European publications

The following referenced documents are indispensable for the application of this document. For dated The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

document (including any amendments) applies.

NOTE

NOTE When an international publication has bWhen an international publication has been modified by common een modified by common modifications, indicated by (mod), the relevant modifications, indicated by (mod), the relevant EN/HDEN/HD applies.

applies.

P

Puubblliiccaattiioonn YeYeaarr TTiittllee EENN//HHDD YYeeaarr IEC

IEC 61010-1 61010-1 2001 2001 Safety Safety requirements requirements for for electrical electrical equipmentequipment for measurement, control, and laboratory for measurement, control, and laboratory use

use

-Part 1: General requirements Part 1: General requirements

EN 61010-1 EN 61010-1 + corr. June + corr. June 2001 2001 2002 2002 IEC

IEC 61557-1 61557-1 --1)1) Electrical safety in Electrical safety in low voltage distributionlow voltage distribution systems up to 1 000 V a.c. and 1 500 V systems up to 1 000 V a.c. and 1 500 V d.c. -d.c. -Equipment for testing, measuring or

Equipment for testing, measuring or monitoring of protective measures monitoring of protective measures -Part 1: General requirements

Part 1: General requirements

EN EN 61557-1 61557-1 200720072)2) 1) 1) Undated reference Undated reference.. 2) 2)

Valid edition at date of issue Valid edition at date of issue..

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61557-5:2007

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