61557-11-2009

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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 11: Effectiveness of residual current monitors (RCMs)

type A and type B in TT, TN and IT systems

raising standards worldwide

™™

NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW

BSI British Standards

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National foreword

This British Standard is the UK implementation of EN 61557-11:2009. It is This British Standard is the UK implementation of EN 61557-11:2009. It is identical to IEC 61557-11:2009.

identical to IEC 61557-11:2009.

The UK participation in its preparation was entrusted to Technical Committee The UK participation in its preparation was entrusted to Technical Committee 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 its correct application.

contract. Users are responsible for its correct application. © BSI 2009 © BSI 2009 ISBN 978 0 580 58116 8 ISBN 978 0 580 58116 8 ICS 17.220.20; 29.080.01; 29.240.01 ICS 17.220.20; 29.080.01; 29.240.01

Compliance with a British Standard cannot confer immunity from

legal obligations.

This British Standard was published under the authority of the Standards This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 April 2009

Policy and Strategy Committee on 30 April 2009

Amen

Amendmen

dments iss

ts issued s

ued since

ince publ

publicati

ication

on

Amd

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NORME EUROPÉENNE

EUROPÄISCHE NORM

March 2009

CENELEC

European Committee for Electrotechnical Standardization

Comité Européen de Normalisation Electrotechnique

Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: avenue Marnix 17, B - 1000 Brussels Central Secretariat: avenue Marnix 17, B - 1000 Brussels

© 2009 CENELEC - ENELEC - All rights All rights of explof exploitation in aoitation in any form ny form and by and by any meanany means reserved s reserved worldwide worldwide for CENELEC for CENELEC members.members.

Ref. No. EN 61557-11:2009 E Ref. No. EN 61557-11:2009 E ICS 17.220.20; 29.080.01; 29.240.01 ICS 17.220.20; 29.080.01; 29.240.01

English version

Electrical safety in low voltage distribution s

Electrical safety in low voltage distribution systems

ystems

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

Equipment for testing, measuring or monitoring of protective measures

-Part 11: Effectiveness of residual current monitors (RCMs)

Part 11: Effectiveness of residual current monitors (RCMs)

type A and type B in TT, TN and IT systems

(IEC 61557-11:2009)

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 ou

Dispositifs de contrôle, de mesure ou

de surveillance de mesures de protection

-Partie 11: Efficacité des contrôleurs

Partie 11: Efficacité des contrôleurs

d'isolement à courant différentiel résiduel

(RCM) de type A et de type B

dans les réseaux TT, TN et IT

(CEI 61557-11:2009)

Elektrische Sicherheit

in

in Niederspannungsne

Niederspannungsnetzen

tzen

bis AC 1 000 V und DC 1 500 V

--Geräte zum Prüfen, Messen oder

Geräte zum Prüfen, Messen oder

Überwachen von Schutzmaßnahmen

-Teil 11: Wirksamkeit von

Teil 11: Wirksamkeit von

Differenzstrom-Überwachungsge

Überwachungsgeräten (RCMs) Typ

räten (RCMs) Typ A

A

und Typ B in TT-, TN- und IT

und Typ B in TT-, TN- und IT-Systemen

-Systemen

(IEC 61557-11:2009)

This European Standard was approved by CENELEC on 2009-02-01. CENELEC members are bound to comply This European Standard was approved by CENELEC on 2009-02-01. 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.

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Foreword

The text of document 85/338/FDIS, future edition 1 of IEC 61557-11, prepared by IEC TC 85, Measuring

equipment for electrical and electromagnetic quantities, was submitted to the IEC-CENELEC parallel vote

and was approved by CENELEC as EN 61557-11 on 2009-02-01.

This standard is to be used in conjunction with EN 61557-1:2007.

The following dates were fixed:

–

– latest date by which the EN has to be implemented

latest date by which the EN has to be implemented

at national level by publication of an identical

national standard or by endorsement

(dop)

2009-11-01

–

– latest date by which the national standards conflicting

latest date by which the national standards conflicting

with the EN have to be withdrawn

(dow)

2012-02-01

Annex ZA has been added by CENELEC.

__________

Endorsement notice

The text of the International Standard IEC 61557-11:2009 was approved by CENELEC as a European

Standard without any modification.

In the official version, for Bibliography, the following notes have to be added for the standards indicated:

IEC

IEC 60364-4-41 60364-4-41 NOTE Harmonized NOTE Harmonized as as HD HD 60364-4-41:2007 60364-4-41:2007 (modified).(modified). IEC

IEC 60364-5-53 60364-5-53 NOTE NOTE Clause Clause 534 534 (in (in IEC/A1:2002) IEC/A1:2002) harmonized harmonized as as HD HD 60364-5-534:2008 60364-5-534:2008 (modified).(modified). IEC

IEC 60364-6 60364-6 NOTE NOTE Harmonized Harmonized as as HD HD 60364-6:2007 60364-6:2007 (modified).(modified). IEC

IEC 60947-2 60947-2 NOTE NOTE Harmonized Harmonized as as EN EN 60947-2:2006 60947-2:2006 (not (not modified).modified). IEC

IEC 61008-1 61008-1 NOTE NOTE Harmonized Harmonized as as EN EN 61008-1:2004 61008-1:2004 (modified).(modified).

__________

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Annex ZA

(normative)

Normative references to international publications

with their

with their correspond

corresponding European publications

ing European publications

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

document (including any amendments) applies.

NOTE

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

applies.

Publication

Year

Title

EN/HD

Year

IEC/TR

IEC/TR 60755

60755

2008

General

General requirements

requirements for

for residual

residual current

current

operated protective devices

-

--IEC

IEC 61010-1

61010-1

2001

Safety

Safety requirements

requirements for

for electrical

electrical

equipment for measurement, control, and

laboratory use

-Part 1: General requirements

Part 1: General requirements

EN 61010-1

+ corr. June

2001

2002

IEC

IEC 61326-2-2

61326-2-2

--

1)1)

Electrical equipment for measurement,

control and laboratory use

EMC requirements

-Part 2-2: -Particular requirements - Test

Part 2-2: Particular requirements - Test

configurations, operational conditions and

performance criteria for portable test,

measuring and monitoring equipment used in

low-voltage distribution systems

EN

EN 61326-2-2

61326-2-2

2006

2)2)

IEC

IEC 61557-1

61557-1

-

Electrical

Electrical safety

safety in

in low

low voltage

voltage distribution

distribution

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

-Equipment for testing, measuring or

Equipment for testing, measuring or

monitoring of protective measures

-Part 1: General requirements

Part 1: General requirements

EN

EN 61557-1

61557-1

2007

IEC

IEC 61557-6

61557-6

-

Electrical

Electrical safety

safety in

in low

low voltage

voltage distribution

distribution

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

-Equipment for testing, measuring or

Equipment for testing, measuring or

monitoring of protective measures

-Part 6: Effectiveness of residual current

Part 6: Effectiveness of residual current

devices (RCD) in TT, TN and IT systems

EN

EN 61557-6

61557-6

2007

IEC

IEC 62020

62020

1998

Electrical

Electrical accessories

accessories -

- Residual

Residual current

current

monitors for household and similar uses

(RCMs)

EN

EN 62020

62020

1998

1) 1) Undated reference. Undated reference. 2) 2)

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

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ELECTRICAL SAFETY IN LOW VOLTAGE DISTRIBUTION

SYSTEMS UP TO 1 000 V a.c.

SYSTEMS UP TO 1 000 V a.c. AND 1 500 V d.c. –

AND 1 500 V d.c. –

EQUIPMENT FOR TESTING, MEASURING OR

MONITORING OF PROTECTIVE MEASURES –

Part 11: Effectiveness of

Part 11: Effectiveness of residual current monitors (RCMs)

residual current monitors (RCMs)

type A and type B in TT, TN and IT systems

1 Scope

This part of IEC 61557 specifies the requirements for testing equipment applied to the testing This part of IEC 61557 specifies the requirements for testing equipment applied to the testing of the effectiveness of residual current monitors (RCMs) of type A and type B, which are of the effectiveness of residual current monitors (RCMs) of type A and type B, which are already installed in distribution systems.

already installed in distribution systems.

This test equipment can be used in any kind of network like a TN, TT or IT system. The test This test equipment can be used in any kind of network like a TN, TT or IT system. The test equipment may also be

equipment may also be used for used for testing directionally discritesting directionally discriminating RCMs in IT-Systems.minating RCMs in IT-Systems.

2 2 Normative

Normative references

references

The following referenced documents are indispensable for the application of this

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

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

IEC/TR 60755:2008,

IEC/TR 60755:2008, General requirements for residual current operated General requirements for residual current operated protective devicesprotective devices

IEC 61010-1:2001,

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

laboratory use – Part 1: General requirementsGeneral requirements

IEC 61326-2-2,

IEC 61326-2-2, Electrical equipment for measurement, control and laboratory use – EMC Electrical equipment for measurement, control and laboratory use – EMC requirements – Part 2-2: Particular requirements – Test configurations, operational conditions requirements – Part 2-2: Particular requirements – Test configurations, operational conditions and performance criteria for portable test, measuring and monitoring equipment used in and performance criteria for portable test, measuring and monitoring equipment used in low-voltage distribution systems

voltage distribution systems

IEC 61557-1,

IEC 61557-1, Electrical safety in low voltage distribution systems up to 1 000 V a.c. and 1 500 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 1: General V d.c. – Equipment for testing, measuring or monitoring of protective measures – Part 1: General requirements

requirements

IEC 61557-6,

IEC 61557-6, Electrical safety in low voltage distribution systems up to 1 000 V a.c. and 1 500 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 6: V d.c. – Equipment for testing, measuring or monitoring of protective measures – Part 6: Effectiveness of residual current devices (RCD) in TT, TN

Effectiveness of residual current devices (RCD) in TT, TN and IT systemsand IT systems

IEC 62020:1998,

IEC 62020:1998, Electrical accessories – Residual current monitors for household and similar Electrical accessories – Residual current monitors for household and similar uses (RCMs)

uses (RCMs)

3 3 Terms

Terms and

and definitions

definitions

For the purposes of

For the purposes of this document, the terms and this document, the terms and definitions given in IEC 61557-1, IEC 61557-definitions given in IEC 1, IEC 61557-6 and the following apply.

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3.1 3.1

residual current monitor (RCM) residual current monitor (RCM)

device or association of devices which m

device or association of devices which m onitors the residual current in onitors the residual current in an electrical installationan electrical installation and which activates an alarm when the residual current exceeds the operating value of the and which activates an alarm when the residual current exceeds the operating value of the device device [IEC 62020, definition 3.3.1] [IEC 62020, definition 3.3.1] 3.2 3.2

earth fault current earth fault current I

I _e_e

current flowing to earth due to an

current flowing to earth due to an insulation faultinsulation fault

[IEC 62020, definition 3.1.1] [IEC 62020, definition 3.1.1] 3.3 3.3 test current test current I I _T_T

test current superimposed by the test equipment for

test current superimposed by the test equipment for testing the effectiveness of the RCMtesting the effectiveness of the RCM

3.4 3.4 residual current residual current I I _∆_∆

vector sum of the instantaneous values of the current flowing in the main circuit of the RCM vector sum of the instantaneous values of the current flowing in the main circuit of the RCM (expressed as r.m.s. value) (expressed as r.m.s. value) [IEC 62020, definition 3.2.3] [IEC 62020, definition 3.2.3] 3.5 3.5

rated residual operating current rated residual operating current I

I

∆ ∆NN

value of residual current assigned by the manufacturer which causes the

value of residual current assigned by the manufacturer which causes the RCM to operate under RCM to operate under specified conditions

specified conditions

[IEC 62020, definitions 3.2.4 and 3.4.1 combined] [IEC 62020, definitions 3.2.4 and 3.4.1 combined]

3.6 3.6

residual operating current residual operating current I

I

∆ ∆oo

value of residual current which causes the RCM to

value of residual current which causes the RCM to operate under specified conditionsoperate under specified conditions

[IEC 62020, definition 3.2.4] [IEC 62020, definition 3.2.4]

3.7 3.7

residual non-operating current residual non-operating current I

I

∆ ∆nono

value of residual current at which and below which the RCM does not operate under specified value of residual current at which and below which the RCM does not operate under specified conditions conditions [IEC 62020, definition 3.2.5] [IEC 62020, definition 3.2.5] 3.8 3.8 actuating time actuating time t t _a_a

time taken for a RCM to change from the non-alarm state to the alarm state in response to the time taken for a RCM to change from the non-alarm state to the alarm state in response to the sudden appearance of a residual current which exceeds the preset

sudden appearance of a residual current which exceeds the preset levellevel

[IEC 62020, definition 3.3.12] [IEC 62020, definition 3.3.12]

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3.9 3.9

residual current monitor (RCM) type A residual current monitor (RCM) type A

RCM for which monitoring is ensured for residual sinusoidal alternating currents and residual RCM for which monitoring is ensured for residual sinusoidal alternating currents and residual pulsating direct currents, whether suddenly applied or slowly rising

pulsating direct currents, whether suddenly applied or slowly rising

[IEC 62020, definition 3.3.8, modified] [IEC 62020, definition 3.3.8, modified]

3.10 3.10

residual current monitor (RCM) type B residual current monitor (RCM) type B RCM for which monit

RCM for which monitoring is ensured for residuoring is ensured for residual sinusoidal alternatal sinusoidal alternating currents, with ing currents, with residualresidual pulsating direct currents and smooth residual direct currents independent of polarity, whether pulsating direct currents and smooth residual direct currents independent of polarity, whether suddenly applied or slowly rising

suddenly applied or slowly rising

[IEC/TR 607

[IEC/TR 60755, 55, definition definition 5.2.9.3, 5.2.9.3, modified]modified]

4 Requirements

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

4.1

4.1 Operating Operating testtest

The testing equipment shall be capable of verifying that the residual operating current of a The testing equipment shall be capable of verifying that the residual operating current of a RCM type A tested with an a.c. test current is lower or equal to the value of the rated residual RCM type A tested with an a.c. test current is lower or equal to the value of the rated residual operating current.

operating current.

Testing of RCMs type A shall be conducted with a suddenly applied calibrated a.c. current at Testing of RCMs type A shall be conducted with a suddenly applied calibrated a.c. current at zero crossing.

zero crossing.

The tests shall be

The tests shall be carried out with a sinusoidal, or mains-derived quasi sinusoidal, test current.carried out with a sinusoidal, or mains-derived quasi sinusoidal, test current.

If the test equipment is capable of producing half-wave test currents, testing of residual current If the test equipment is capable of producing half-wave test currents, testing of residual current monitors (RCMs) type A may be carried out

monitors (RCMs) type A may be carried out alternativelalternatively with half-wave test currents and/or a.c.y with half-wave test currents and/or a.c. current with superimposed

current with superimposed ±±_{6 mA d.c. according to IEC 62020.}_{6 mA d.c. according to IEC 62020.}

In case of

In case of pulsed d.c. current, the test equipment shall be pulsed d.c. current, the test equipment shall be capable of testing in both polarities.capable of testing in both polarities.

When testing RCMs of type B with a d.c. test current, it shall be verified that the residual When testing RCMs of type B with a d.c. test current, it shall be verified that the residual operating current is lower or equal to 2

operating current is lower or equal to 2 times the value of times the value of the rated residual operating current.the rated residual operating current.

Testing of RCMs type B shall be conducted separately with a suddenly applied, calibrated a.c. Testing of RCMs type B shall be conducted separately with a suddenly applied, calibrated a.c. current and a continuously rising smooth direct current.

current and a continuously rising smooth direct current.

The steepness of the continuous rate of rising shall not be higher than 2

The steepness of the continuous rate of rising shall not be higher than 2 ×× I I _∆_∆_N_N _{/ 5 s.}_{/ 5 s.}

If the continuous rate of

If the continuous rate of rising is simulated by a rising is simulated by a stepwise or linearly increasing test current, thestepwise or linearly increasing test current, the increase shall not be higher than 2

increase shall not be higher than 2 ×× I I

∆

∆ N N / 30 (see Figures 1 to 3)./ 30 (see Figures 1 to 3).

In both cases the starting current

In both cases the starting current shall be below 0,2shall be below 0,2 ×× I I

∆ ∆ N N..

The operating uncertainty of the increasing test current

The operating uncertainty of the increasing test current I I _T_T _{shall not exceed}_{shall not exceed} ±±_{10 % of the rated}_{10 % of the rated}

residual operating current residual operating current I I _∆_∆_N_N..

The operating uncertainty of the calibrated test current

The operating uncertainty of the calibrated test current I I _T_T _{shall not exceed 0 % to +10 %.}_{shall not exceed 0 % to +10 %.}

The test period shall be adapted to the set actuating time of the RCM and it shall be

The test period shall be adapted to the set actuating time of the RCM and it shall be possible topossible to extend the test period up to 10 s.

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4.2

4.2 Non-operating Non-operating testtest

When a test at 50 % or less of the rated residual operating current to test the reliability of the When a test at 50 % or less of the rated residual operating current to test the reliability of the RCM is included, the minimum test period shall be 10 s. The alarm shall not be activated.

RCM is included, the minimum test period shall be 10 s. The alarm shall not be activated.

When a non-operating test at 50 % or less of the rated residual operating current is included, When a non-operating test at 50 % or less of the rated residual operating current is included, the operating uncertainty of the calibrated test current shall not exceed 0 % to –10 % of the the operating uncertainty of the calibrated test current shall not exceed 0 % to –10 % of the specified non-operating test current.

specified non-operating test current.

NOTE

NOTE Existing Existing leakage currents leakage currents downstream can downstream can influence the influence the verification.verification.

4.3

4.3 Test Test of of actuating actuating timetime

If the set actuating time of the RCM is being tested with the test equipment, the setting of the If the set actuating time of the RCM is being tested with the test equipment, the setting of the test period on the test device shall have a resolution of minimum

test period on the test device shall have a resolution of minimum 0,5 s ranging up to 10 0,5 s ranging up to 10 s. Thes. The setting uncertainty shall not exceed 0

setting uncertainty shall not exceed 0 % to % to –10 –10 % of % of the set value. Tthe set value. T he test shall solely behe test shall solely be performed with calibrated a.c. test current.

performed with calibrated a.c. test current.

Other methods for the acquisition of the

Other methods for the acquisition of the actuating time via optical recognition or interfacing areactuating time via optical recognition or interfacing are permissible.

permissible.

NOTE

NOTE The general function of The general function of RCMs is RCMs is not the disconnecting of the power not the disconnecting of the power supply when supply when a residual current abovea residual current above the value of the rated residual operating current occurs. The RCM indicates the increase of the residual current the value of the rated residual operating current occurs. The RCM indicates the increase of the residual current above the residual operating current with a signalling device, for example a lamp, buzzer, contact relay or above the residual operating current with a signalling device, for example a lamp, buzzer, contact relay or interface-signal. Thus the response time may only be tested via the visual or additional electrical detection of this interface-signal. signal. Thus the response time may only be tested via the visual or additional electrical detection of this signal. Acc

Acc ordord ing ing to to IEIE C 6C 6 202202 0 0 the the resres ponpon se se timtim e e of of RCMs RCMs mama y y onlonl y y amam ounoun t t to to a a mama ximxim um um of of 10 10 s. s. The The resres ponpon se se timtim ee shall be specified by the manufacturer or shall be adjustable on the device.

shall be specified by the manufacturer or shall be adjustable on the device.

If the RCM is being used for the purpose of disconnection, the tests covered by IEC 61557-6 If the RCM is being used for the purpose of disconnection, the tests covered by IEC 61557-6 shall apply.

shall apply.

4.4

4.4 Operating Operating conditionsconditions

The operating uncertainty appli

The operating uncertainty applies according to the es according to the test conditions specified in IEC 61557-1 andtest conditions specified in IEC 61557-1 and additionally

additionally

–

– the the prproteote cticti ve ve concon ducduc tor tor is is frfree ee of of extext ranran eoueou s vs voltolt ageage,, –

– the the syssystem tem volvol tagtag e re r ememainain s cs c onsons tantan t dt d uriuri ng ng testes tsts,, –

– the the circir cucuit it bebehinhind td t he he RCM RCM is is frfree ee of of lealeakakage ge cucurrrrentent s,s, –

– sinsinususoidoidal al halhal f-f-wavwave e or or fufull-ll- wavwave e cucurrrrent ent witwith h rarated ted frfrequequencenc y, y, resres pecpec tivtiv ely ely smsmootoot h h dirdir ecectt current (see 4.1),

current (see 4.1), –

– the the a.a.c. c. testes t ct c ururrerentnt I I _T_T _{shall be switched on at a}_{shall be switched on at a zero crossing,}_{zero crossing,} –

– the the testest t perper iod iod shasha ll ll be be 10 10 s s fofor r the the mamaximxim um um testes t t curcur rerent nt fofor r whiwhich ch the the testes t t equequipmipm ent ent isis designed,

designed, –

– the the timtim e le l imimit it mamay be y be omomittitted ed whewhen n testes tinting wg with ith cucurrrrent ent highig her her thatha n 5n 5 00 00 mAmA,, –

– the the reresissis tantan ce ce of of the the prprobeobe s is i s ws withith in in the the limlim its its stasta ted ted by tby t he he mamanufnuf actact ururer.er.

4.5

4.5 Prevention Prevention of danger of danger by by fault fault voltages voltages exceeding exceeding 50 50 V aV a.c. .c. or or 120 120 V d.cV d.c. i. in then the monitored system during measurement

monitored system during measurement

This can be achieved by the following: This can be achieved by the following:

–

– autaut omomatiati c c disdiscoconnennectction ion in in accacc orordandance ce witwith h IEC IEC 610610 10-10- 1:21:2 001001 , , FiFigurgur e e 1, 1, if if the the resres iduidualal voltage is above 50 V a.c. or 120 V d.c.;

voltage is above 50 V a.c. or 120 V d.c.; –

– appapp liclicatiati on on of of testes t t cucurrrrentent I I _T_T_{, gradually or permanently adjustable, where the test starts a}_{, gradually or permanently adjustable, where the test starts a} maximum current of

maximum current of a.c. 3,5 mA or a.c. 3,5 mA or 15 mA d.c. 15 mA d.c. in accordance with IEC 61010-1:200in accordance with IEC 61010-1:2001, 6.3.21, 6.3.2 b), including parallel test circuits, is permitted. The possibility to change the test current b), including parallel test circuits, is permitted. The possibility to change the test current I I _T_T

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without generatin

without generating a g a dangerous residual voltage shall be clearly identifiable, for dangerous residual voltage shall be clearly identifiable, for instance oninstance on a voltmeter.

a voltmeter.

In special locations the touch volt

In special locations the touch voltage limit is 25 V a.c or age limit is 25 V a.c or 60 V d.c.60 V d.c.

The operating uncertainty for the detecti

The operating uncertainty for the detection of the fault voltage shall not exceed 0 % to –20 % on of the fault voltage shall not exceed 0 % to –20 % of of the limit.

the limit.

4.6

4.6 Prevention Prevention of of danger danger caused caused by by overvoltages overvoltages when when the the system system is is connectedconnected

If the system is connected to 120 % of the nominal voltage of the system for which the test If the system is connected to 120 % of the nominal voltage of the system for which the test equipment is designed, neither the operator shall be harmed nor the device be damaged. equipment is designed, neither the operator shall be harmed nor the device be damaged. Protective devices shal

Protective devices shall not be activated. If the l not be activated. If the device is intended to be used in IT device is intended to be used in IT systems, thesystems, the nominal voltage of the test equipment is

nominal voltage of the test equipment is the phase to phase voltage.the phase to phase voltage.

If the test equipment is accidentally connected to 173 % of the nominal voltage in TN or TT If the test equipment is accidentally connected to 173 % of the nominal voltage in TN or TT systems for which the test equipment is designed for

systems for which the test equipment is designed for the duration of 1 mthe duration of 1 m in, neither the operator in, neither the operator shall be harmed nor

shall be harmed nor the device be damaged. In this case, the device be damaged. In this case, protective devices may be activated.protective devices may be activated.

4.7

4.7 Electromagnetic Electromagnetic compatibility compatibility (EMC)(EMC)

The electromagnetic compatibility shall be in

The electromagnetic compatibility shall be in accordance with IEC 61326-2-2.accordance with IEC 61326-2-2.

5 5 Marking

Marking and

and operating

operating instructions

instructions

5.1 Markings 5.1 Markings

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.

Rated residual operating current or rated residual operating currents of the RCM for which the Rated residual operating current or rated residual operating currents of the RCM for which the test equipment has been designed for an actuating time of 10 s.

test equipment has been designed for an actuating time of 10 s.

NOTE

NOTE Other rated residual operating currents for lower actuating times may be marked in addition.Other rated residual operating currents for lower actuating times may be marked in addition.

5.2

5.2 Operating Operating instructionsinstructions

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

IEC 61557-1.

5.2.1 Information 5.2.1 Information a)

a) Information about special test configurations to avoiInformation about special test configurations to avoid unintended trippid unintended tripping of RCDs (seeng of RCDs (see Ann

Ann ex ex B)B);; b)

b) information to avoinformation to avoid unintended id unintended influences on influences on the operation othe operation of the system;f the system; c)

c) information for recalibratinformation for recalibration cycles and safetion cycles and safety tests of the test equipment after repay tests of the test equipment after repair andir and instructions for periodical tests.

instructions for periodical tests.

5.2.2 Warnings 5.2.2 Warnings

a)

a) If the If the detecting detecting circuit for circuit for the fault the fault voltage voltage has no prohas no probe and ibe and if a possibf a possible voltagle voltage betweee betweenn the protective conductor and earth influences the measurements, a

the protective conductor and earth influences the measurements, a warning shall be included.warning shall be included.

b)

b) Where the detecting circuit Where the detecting circuit for the for the fault vfault voltage oltage uses the uses the N-conductor N-conductor as a as a probe, aprobe, a warning shall be given to test the connection between the neutral point of the distribution warning shall be given to test the connection between the neutral point of the distribution system and earth before the test is started; a possible voltage between the N-conductor and system and earth before the test is started; a possible voltage between the N-conductor and earth may influence the measurements.

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c)

c) A waA warning tharning that leakage t leakage currents icurrents in the n the circuit circuit following following the Rthe RCM may CM may influenceinfluence measurements and test results.

measurements and test results.

d)

d) The earth The earth electrode electrode resistance resistance of a dof a detecting etecting circuit for circuit for the fault the fault voltage voltage with with a probe a probe shallshall not exceed the value stated by the m

not exceed the value stated by the m anufacturer.anufacturer.

e)

e) A warninA warning that g that the potethe potential fielntial fields of otds of other eartheher earthed instald installations lations may imay influence nfluence thethe determination of the fault voltage.

determination of the fault voltage.

f)

f) A warniA warning that ng that for special for special locations locations the touthe touch voltach voltage is ge is limited to limited to 25 V 25 V a.c or a.c or 60 V 60 V d.c.d.c.

6 Tests

6.1 General 6.1 General

The following tests in addition to those required according to IEC

The following tests in addition to those required according to IEC 61557-1 shall be executed.61557-1 shall be executed.

Tests shall be carried out with rated residual operating currents, in addition with the values of Tests shall be carried out with rated residual operating currents, in addition with the values of the non-operating test currents

the non-operating test currents I I _T_T_{, if}_{, if applicable.}_applicable.

The test circuit shall be adapted to test the function of the fault voltage detection circuit at the The test circuit shall be adapted to test the function of the fault voltage detection circuit at the limits of the fault

limits of the fault voltage for which the equipment is designed and in addition at the voltage for which the equipment is designed and in addition at the appropriateappropriate R

R_A_A == R R_Amax_Amax _{for each range.}_{for each range.}

The test circuit shall be adapted to each test method employed. The manufacturer’s The test circuit shall be adapted to each test method employed. The manufacturer’s instructions shall be heeded.

instructions shall be heeded.

NOTE NOTE _Δ_Δ_o_o Δ ΔNN I I R R I I U U × × = = LL Amax Amax T T L L Amax Amax _I_I

U U R R == where where U U L

L is the conventional touch voltage limit;is the conventional touch voltage limit;

I I

T

T is the test current superimposed by the test circuit;is the test current superimposed by the test circuit;

R R

A

A is the total earthing resistance (is the total earthing resistance ( R RAA== R RAmaxAmax););

I

I _∆_∆ N N is the rated residual operating current;is the rated residual operating current;

I

I _∆_∆_o_o _{is the residual operating current.}_{is the residual operating current.} 6.2

6.2 Operating Operating uncertaintyuncertainty

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

intrinsic uncertainty shall be determined under the following reference conditions:following reference conditions:

–

– nomnom inaina l vl v oltoltage age of of the the rarated ted rarange nge of of the the devdev iceice,, –

– nomnom inaina l fl f rerequequencncy of y of the the ratrat ed ed ranran ge ge of of the the dedevicvice,e, –

– rerefefererence nce temtem perper atuatu re re 23 23 °C°C ±± _{2 °C,}_{2 °C,}

–

– rerefeferenren ce ce pospos itiiti on on in in acaccorcor dandan ce ce witwith th t he he mamanufnuf actact ururer'er' s s insins trtructuct ionions,s, –

– prproteote ctctive ive concon ducduc tor tor frfree ee frfrom om exextratra neoneo us us volvoltagtag eses,, –

– 100100 ΩΩ resistance of the auxiliary earth electrode in a TT resistance of the auxiliary earth electrode in a TT system.system. The operating uncertainty thus evaluate

The operating uncertainty thus evaluated shall not exceed the d shall not exceed the limits specified in 4.1 to 4.2.limits specified in 4.1 to 4.2.

a)

a) Compliance with thCompliance with the permissible operating une permissible operating uncertainty wcertainty when detecting the fault hen detecting the fault voltagevoltage shall be tested for m

shall be tested for m easurements with and without a probe.easurements with and without a probe.

b)

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c)

c) The overload The overload protection protection in accordanin accordance witce with 4.6 h 4.6 shall bshall be testede tested (type test).(type test).

d)

d) Compliance Compliance with with the tests the tests in this in this clause shaclause shall be ll be recorded.recorded.

Table 1 – Calculation of

Table 1 – Calculation of operating uncertaintyoperating uncertainty

Intrinsic uncertainty Intrinsic uncertainty or influence quantity or 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 accordance with the relevant the relevant parts of series parts of series IEC 61557 IEC 61557 Type of Type of test test Intrinsic

Intrinsic uncertainty uncertainty Reference Reference conditions conditions A A Part Part 11, 11, 6.2 6.2 RR Position

Position Reference positionReference position±±_90°_90° EE₁₁ Part Part 1, 1, 4.2 4.2 RR Supply

Supply voltage voltage At At the the limits limits stated stated by by thethe manufacturer

manufacturer

E

E₂₂ Part Part 1, 1, 4.2, 4.2, 4.3 4.3 RR

Temperature

Temperature 0 °C 0 °C and and 35 35 °C °C EE₃₃ Part Part 1, 1, 4.2 4.2 TT Resistance of the

Resistance of the probes

probes

Within the limits stated by Within the limits stated by the m

the m anufactureanufacturer r

E

E₅₅ Part Part 11, 11, 4.4 4.4 TT

System

System voltage voltage 85 85 % % to to 110 110 % % of of thethe nominal voltage nominal voltage

E

E₈₈ Part Part 11, 11, 4.4, 4.4, 4.5 4.5 TT

Operating

Operating uncertainty uncertainty Part Part 11, 11, 4.14.1

Part 11, 4.2 Part 11, 4.2 Part 11, 4.3 Part 11, 4.3 Part 11, 4.5 Part 11, 4.5 R R A

A = = intint rinrin sic sic uncunc ertert ainain tyty E

E_n_n = = variationsvariations R

R = = routine routine testtest T

T = = type type testtest

( ( ))

100100%% value value fiducial fiducial B B = = % % B B ±± ×× )) E E E E E E E E E E 1,15 1,15 A A (( B B==±± ++ ₁₁22 ++ 22₂₂++ ₃₃22++ ₅₅22++ ₈22₈

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∆ ∆t t ∆ ∆ I I _T_T I I _T_T t t IEC 2359/08 IEC 2359/08 ∆

∆ I I _T_T ≤≤ 22 I I _∆_∆_N_N / / 3030 ∆∆ I I _T_T // ∆∆t t ≤≤ 22 I I _∆_∆_N_N / / 5 s5 s

Key

Key (for Figures 1 to 3)(for Figures 1 to 3)

t

t _time_time

I

I ∆∆ N N rated residual operating currentrated residual operating current

I

I TT smooth direct test smooth direct test currentcurrent

∆

∆ I I TT steepness of continuous rising test current or steps of stepwise rising test currentsteepness of continuous rising test current or steps of stepwise rising test current

∆

∆t t _{time for one step for stepwise rising test current or time for steepness of continuous rising test current}_{time for one step for stepwise rising test current or time for steepness of continuous rising test current}

Figure 1 – Maximum steepness of stepwise rising smooth direct test current ( Figure 1 – Maximum steepness of stepwise rising smooth direct test current ( I I _T_T₎₎

∆ ∆t t ∆ ∆ I I _T_T I I _T_T t t IEC 2360/08 IEC 2360/08 ∆

∆ I I _T_T // ∆∆t t ≤≤ 22 I I _∆_∆_N_N / 5/ 5 ss

Figure 2 – Maximum increase of

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∆ ∆t t ∆ ∆ I I _T_T I I _T_T t t IEC 2361/08 IEC 2361/08 ∆ ∆ I I _T_T ≤≤ ₂₂ ×× _{30 mA / 30}_{30 mA / 30} ≤≤ _{2 m}_{2 m A}_A Example for

Example for ∆∆ I I _T_T _{= 2 mA:}_{= 2 mA:} ∆∆t t ≥≥ _{(2 mA}_{(2 mA} ×× _{5 s) / (2}_{5 s) / (2} ×× _{30 mA)}_{30 mA)} ≥≥ _{167 ms}_{167 ms}

Example for

Example for ∆∆ I I _T_T _{= 0,5 mA:}_{= 0,5 mA:} ∆∆t t ≥≥ _{(0,5 mA}_{(0,5 mA} ×× _{5 s) / (2}_{5 s) / (2} ×× _{30 mA)}_{30 mA)} ≥≥ _{42 ms}_{42 ms}

NOTE 1

NOTE 1 Existing leakage currents downstream may influence the verification.Existing leakage currents downstream may influence the verification. NOTE 2

NOTE 2 The actual rise time depends on the The actual rise time depends on the system capacitance and the resistive load of the test equipment.system capacitance and the resistive load of the test equipment. NOTE 3

NOTE 3 Smooth d.c. test current refers to direct current with a.c. ripple up to 10 % (peak to peak).Smooth d.c. test current refers to direct current with a.c. ripple up to 10 % (peak to peak). NOTE 4

NOTE 4 A A sloslo w w concon titi nuonuo us us or or steste pwispwis e e incinc rearea se se of of the the d.cd.c . . tete st st curcur renren t t is is reqreq uiruir ed ed to to prepre venven t t the the a.ca.c . . sensen sitsit iveive part of the RCM type B from operating during the d.c. test.

part of the RCM type B from operating during the d.c. test.

Figure 3 – Example for linearly increasing smooth direct test current

Figure 3 – Example for linearly increasing smooth direct test current (( I I _T_T_):_): I I

∆

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Annex A

(informative)

Differences between RCMs and RCDs

A.1 Scope

This Annex A gives guidelines for specifying the differences between residual current monitors This Annex A gives guidelines for specifying the differences between residual current monitors (RCMs) and residual current protective devices (RCDs). The understanding is important in the (RCMs) and residual current protective devices (RCDs). The understanding is important in the design of test equipment and f

design of test equipment and f or testing RCMs in electrical installations.or testing RCMs in electrical installations.

A.2

A.2 Referenc

Reference

e documents

documents and

and definition

definition of

of function

function

Table A.1 shows the differences by definition according to the respective product standard. Table A.1 shows the differences by definition according to the respective product standard.

Table A.1 – Normative reference and definition of function

Table A.1 – Normative reference and definition of function of RCM and RCDof RCM and RCD

Product

Product Standard Standard Definition of Definition of functionfunction RCM

RCM IEIE C C 620620 20:20: 199199 8, 8, 3.3. 3.1 3.1 A residual A residual current current monitor monitor (RCM) (RCM) is is a a device device or or an an association association of of devices which monitors the residual current in

devices which monitors the residual current in an electrical installation,an electrical installation, and which activates an alarm when the residual current exceeds the and which activates an alarm when the residual current exceeds the operating value of the device

operating value of the device RCD

RCD IEC/TR IEC/TR 60755:2008, 60755:2008, 3.3.1 3.3.1 A A residual residual current current device device (RCD) (RCD) is is a a mechanical mechanical switching switching devicedevice or association of devices designed to make, carry and break or association of devices designed to make, carry and break currents under normal service conditions and to cause the currents under normal service conditions and to cause the opening of the contacts when the residual current attains a given opening of the contacts when the residual current attains a given value under specified conditions

value under specified conditions

IEC

IEC 62020 is the 62020 is the only product standard for only product standard for RCMs. RCMs covered by this RCMs. RCMs covered by this standard are notstandard are not intended to be used as protective devices, but may be used in conjunction with protective intended to be used as protective devices, but may be used in conjunction with protective devices (see IEC

devices (see IEC 60364-4-41).60364-4-41).

IEC/TR 60755 is the basic product standard for RCDs. Variations of RCDs are covered by IEC/TR 60755 is the basic product standard for RCDs. Variations of RCDs are covered by other product standards, for example

other product standards, for example IEC 61008-1 and IEC 60947-2.IEC 61008-1 and IEC 60947-2.

If RCMs are used together with switching devices and this combination fulfils the respective If RCMs are used together with switching devices and this combination fulfils the respective RCD standards, for example IEC 60947-2 for MRCDs, this combination has to be tested in the RCD standards, for example IEC 60947-2 for MRCDs, this combination has to be tested in the installatio

installation with equipment covered n with equipment covered by IEC 61557-6.by IEC 61557-6.

A.3

A.3 Requirements

Requirements from

from product

product standards

standards for

for testing

testing RCMs

RCMs

Table A.2 shows the

Table A.2 shows the requirements from requirements from the product standard IEC the product standard IEC 62020:1998 which should62020:1998 which should apply when testing RCMs in installations.

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Table A.2 – Requirements for testing RCMs according Table A.2 – Requirements for testing RCMs according

to product standard IEC 62020:1998 to product standard IEC 62020:1998

Requirement

Requirement Explanation Explanation Consequence Consequence for for testingtesting Type

Type of of RCM RCM Type Type A A (type (type a.c. a.c. is is not not allowed)allowed)

Type B existing, but is not covered by IEC 62020 Type B existing, but is not covered by IEC 62020

Test with the applicable waveforms Test with the applicable waveforms

Rated residual Rated residual operating current operating current

Values to be defined by the manufacturer Values to be defined by the manufacturer Preferred values are : 0,006 A, 0,01 A, 0,03 A, Preferred values are : 0,006 A, 0,01 A, 0,03 A, 0,1 A, 0,3 A, 0,5 A

0,1 A, 0,3 A, 0,5 A

Values can be fixed or adjustable Values can be fixed or adjustable

Test with the values defined by the Test with the values defined by the manufacturer and appropriate device manufacturer and appropriate device settings for adjustable devices settings for adjustable devices should be considered

should be considered

The operating tolerances of the RCM The operating tolerances of the RCM (residual operating and

(residual operating and non-operating current) are equal to that operating current) are equal to that of RCDs

of RCDs Act

Act uatuat ing ing timtim e e For RCMs For RCMs onlonl y a y a mama ximxim um um actact uatuat ing ing timtim e ie i ss defined: 10 s

defined: 10 s

The actuation time can be fixed or adjustable The actuation time can be fixed or adjustable

Defined or adjusted actuating times Defined or adjusted actuating times should be considered

should be considered

Preferred values of Preferred values of rated frequency rated frequency

RCMs type A: 50 Hz and/or 60 Hz – manufacturer RCMs type A: 50 Hz and/or 60 Hz – manufacturer can define

can define other values, other values, but but frequency responsefrequency response is not defined in the product standard

is not defined in the product standard RCMs type B: see RCDs type B RCMs type B: see RCDs type B

RCDs type A: preferred value is RCDs type A: preferred value is 50 Hz

50 Hz

RCDs type B: frequency response is RCDs type B: frequency response is limited to 1 000 Hz

limited to 1 000 Hz Indication of the fault

Indication of the fault condition

condition

RCMs should be provided with means for RCMs should be provided with means for indicating the fault condition

indicating the fault condition

RCMs may be fitted with a resetting function to RCMs may be fitted with a resetting function to manually reset the RCM to the non-alarm state manually reset the RCM to the non-alarm state after removal of the fault. RCMs not fitted with after removal of the fault. RCMs not fitted with resetting function should reset

resetting function should reset automatically after automatically after removal of the fault

removal of the fault

Where an audible alarm is provided in addition, Where an audible alarm is provided in addition, the audible alarm should reset automatically after the audible alarm should reset automatically after removal of the fault

removal of the fault

Different to RCDs, tripping of the Different to RCDs, tripping of the RCM can not be recognized due to RCM can not be recognized due to switching off of the monitored voltage switching off of the monitored voltage Recognition of tripping can only be Recognition of tripping can only be performed by monitoring or

performed by monitoring or controlling the respective alarm controlling the respective alarm function:

function:

Examples of alarm functions: Examples of alarm functions: –

– visvis ual ual indind icaica tor tor (re(re quiqui redred )) –

– audaud iblibl e ae a larlar m m (op(op titi onaona l)l) –

– alaala rm rm concon tata ct ct (op(op tiotio nalnal )) –

– alaala rm rm via via digdig itaita l l intint erferf aceace (optional) (optional) Disconnection of an Disconnection of an external CT external CT

If the RCM is equipped with an external residual If the RCM is equipped with an external residual current transformer (CT), the RCM should give a current transformer (CT), the RCM should give a warning, if the CT is disconnected

warning, if the CT is disconnected

Disconnection is normally checked Disconnection is normally checked during the operating test of the RCM during the operating test of the RCM

A.4

A.4 Main

Main technical

technical differences

differences between

between RCMs

RCMs and

and RCDs

RCDs

Table A.3 shows the m

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Table A.3 – Main technical differences between RCMs and RCDs Table A.3 – Main technical differences between RCMs and RCDs

Function

Function RCM RCM RCDRCD

Operation

Operation / / Tripping Tripping (actuating) (actuating) Operation Operation is is indicated indicated on on the the RCM RCM byby a visual signal on the front of the a visual signal on the front of the device. Additional signals for device. Additional signals for indicating operation may be : indicating operation may be : –

– audaud iblibl e e alaala rm,rm, –

– alaala rm rm concon tactac tsts ,, –

– digdig itit al al intint erferf aceace ..

Operation can not be recognized on Operation can not be recognized on an outlet, where the test is performed an outlet, where the test is performed and which is located outside the area and which is located outside the area where the alarm on the RCM itself where the alarm on the RCM itself can be recognized

can be recognized

Tripping is primarily indicated by Tripping is primarily indicated by switching off the voltage

switching off the voltage

Tripping can be recognized on any Tripping can be recognized on any outlet or part of the installation where outlet or part of the installation where the test is

the test is performedperformed

Act

Act uatuat ing ing timtim e e ActAct uatuat ing ing timtim e ce c an an be be anyany wherwher ee between 0 s and 10 s

between 0 s and 10 s

The set or fixed actuating time The set or fixed actuating time should be respected

should be respected Act

Act uatuat ing ing titi me me for for RCMs RCMs relrel atat e te t o 1o 1 ×× I

I

Δ Δ N N onlyonly

The maximum actuating time of The maximum actuating time of RCDs is defined in the respective RCDs is defined in the respective RCD standards

RCD standards Act

Act uatuat ing ing timtim e he h as as to to folfol low low thth e te t imim ee characteristics of the RCD standards characteristics of the RCD standards for 1 time

for 1 time I I

Δ Δ N N,,

2 times 2 times I I

Δ

Δ N N, 5 times, 5 times I I ΔΔ N N

Operating

Operating / / Tripping Tripping values values Operating values Operating values can can be be fixed fixed or or adjustable

adjustable. Adjustment can be . Adjustment can be inin steps or steplessly by switches, steps or steplessly by switches, potentiometer

potentiometers or s or by menu settingsby menu settings via displays

via displays

The set operating values are visible The set operating values are visible on the front of the RCM

on the front of the RCM

Tripping values are fixed or Tripping values are fixed or adjustable in steps. The set values adjustable in steps. The set values are indicated on the front of the are indicated on the front of the device

device

Supply

Supply voltage voltage dependencdependency y RCMs RCMs are are voltage voltage dependendependent t devicesdevices RCDs RCDs type type A A may may be be voltagevoltage-dependent or voltage-independant. dependent or voltage-independant. Standards for voltage-dependent Standards for voltage-dependent RCDs are under consideration RCDs are under consideration RCDs type B are generally voltage RCDs type B are generally voltage dependant

dependant Indication of the value of the

Indication of the value of the measured residual current measured residual current

Some RCMs are equipped with Some RCMs are equipped with functions for the indication of the functions for the indication of the residual current

residual current

RCDs generally have no such RCDs generally have no such indication

indication Multi-channel

Multi-channel devices devices RCMs RCMs can can be be multi-channmulti-chann el el devices.devices. In this case several residual current In this case several residual current sensors (CTs) are connected to one sensors (CTs) are connected to one device. Setting operating values and device. Setting operating values and signalling alarms are performed on signalling alarms are performed on this device

this device

Generally RCDs are single channel Generally RCDs are single channel devices

devices

A.5

A.5 Special

Special considera

considerations

tions for

for testing

testing RCMs

RCMs in

in the

the installation

installation

The following points should be considered when testing already installed RCMs: The following points should be considered when testing already installed RCMs:

–

– opeope ratrat ion ion of of the the RCM RCM shshoulould d be be rerecogcog niznized ed by by watwatchichi ng ng the the alaalarm rm indindicaica tor tor on on the the frfront ont of of the RCM or on

the RCM or on a remote indication device;a remote indication device; –

– the the setset tintings gs of of the the testes t t equequipmipm ent ent shosho uld uld allallow ow steste pwipwise se or or concontintin uouuous s incinc rerease ase of of the the testes tt current;

current; –

– fofor r testes tinting g the the opeope ratrat ing ing valvalue ue ththe e timtim e e fofor r eaceac h h ststep ep or or grgraduadu al al incinc rearea se se of of the the testes t t curcur renren tt should respect the setting of the actuating time on the RCM ( 0…10 s).

should respect the setting of the actuating time on the RCM ( 0…10 s).

If other fault-indication is provided, for example audible or remote

If other fault-indication is provided, for example audible or remote indications via alarm contactindications via alarm contact or digital interface, these indications should be

or digital interface, these indications should be tested as well.tested as well.

Figure A.1 shows a typical installation where RCMs are installed in addition to RCDs. Figure A.1 shows a typical installation where RCMs are installed in addition to RCDs.

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RCD RCD Type A

Type A _{Type B}_{Type B}

RCM type B RCM type B M M VFD VFD RCD RCD Type A Type A RCD RCD Type A Type A RCD RCD Type A Type A RCD RCD Type A Type A Multichannel Multichannel RCM type A RCM type A MDP MDP SDP SDP Socket outlets Socket outlets RCD RCD RCM type A RCM type A IEC 2362/08 IEC 2362/08 Key Key MDP

MDP main main distribution distribution panelpanel SDP

SDP sub sub distribution distribution panelpanel VFD

VFD variable variable frequency frequency devicedevice

M motor

RCD

RCD residual residual current current devicedevice RCM

RCM residual residual current current monitoring monitoring devicedevice

Figure A.1 – Typical installation with a combination of RCDs and RCMs Figure A.1 – Typical installation with a combination of RCDs and RCMs