IEC 61557-13:2011

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 13: Hand-held and hand-manipulated current clamps and sensors for measurement of leakage currents in electrical distribution systems

IEC 61557-13:2011 defines special performance requirements for hand-held and hand-manipulated current clamps and sensors for measurement of leakage currents in electrical distribution systems up to 1 000 V a.c. and 1 500 V d.c., taking into account the influence of high external low-frequency magnetic fields and other influencing quantities. This standard does not apply to current clamps or sensors which are used in combination with devices for insulation fault location according to IEC 61557-9, unless it is specified by the manufacturer.

Sécurité électrique dans les réseaux de distribution basse tension de 1 000 V c.a. et 1 500 V c.c. - Dispositifs de contrôle, de mesure ou de surveillance de mesures de protection - Partie 13: Pinces et capteurs de courant portatifs et manipulés à la main pour la mesure des courants de fuite dans les réseaux de distribution électriques

La CEI 61557-13:2011 définit les exigences spécifiques d'aptitude à la fonction relatives aux pinces et capteurs de courant portatifs et manipulés à la main, en vue de la mesure des courants de fuite dans les réseaux de distribution électriques de 1 000 V en courant alternatif et 1 500 V en courant continu, en tenant compte de l'influence des champs magnétiques à basse fréquence externes élevés et autres grandeurs d'influence. La présente norme ne s'applique pas aux pinces et capteurs de courant utilisés en association avec des dispositifs prévus pour la localisation des défauts d'isolement conformes à la CEI 61557-9, sauf spécification de la part du fabricant.

General Information

• Status: Published
• Publication Date: 07-Jul-2011
• ICS: 17.220.20 - Measurement of electrical and magnetic quantities
• ICS: 29.080.01 - Electrical insulation in general
• ICS: 29.240.01 - Power transmission and distribution networks in general
• Technical Committee: TC 85 - Measuring equipment for electrical and electromagnetic quantities
• Drafting Committee: WG 8 - TC 85/WG 8
• Current Stage: DELPUB - Deleted Publication
• Start Date: 25-Aug-2023
• Completion Date: 27-Aug-2021

Relations

• Revised: IEC 61557-13:2023 - Electrical safety in low voltage distribution systems up to 1 000 V AC and 1 500 V DC - Equipment for testing, measuring or monitoring of protective measures - Part 13: Hand-held and hand-manipulated current clamps and sensors for measurement of leakage currents in electrical distribution systems
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 61557-13 ®
Edition 1.0 2011-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
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 13: Hand-held and hand-manipulated current clamps and sensors for
measurement of leakage currents in electrical distribution systems

Sécurité électrique dans les réseaux de distribution basse tension de
1 000 V c.a. et 1 500 V c.c. – Dispositifs de contrôle, de mesure ou de
surveillance de mesures de protection –
Partie 13: Pinces et capteurs de courant portatifs et manipulés à la main pour
la mesure des courants de fuite dans les réseaux de distribution électriques

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IEC 61557-13 ®
Edition 1.0 2011-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
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 13: Hand-held and hand-manipulated current clamps and sensors for
measurement of leakage currents in electrical distribution systems

Sécurité électrique dans les réseaux de distribution basse tension de
1 000 V c.a. et 1 500 V c.c. – Dispositifs de contrôle, de mesure ou de
surveillance de mesures de protection –
Partie 13: Pinces et capteurs de courant portatifs et manipulés à la main pour
la mesure des courants de fuite dans les réseaux de distribution électriques

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX R
ICS 17.220.20; 29.080.01; 29.240.01 ISBN 978-2-88912-571-5

– 2 – 61557-13  IEC:2011
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 Requirements . 9
4.1 General . 9
4.2 Operating classes . 9
4.2.1 General . 9
4.2.2 Operating class 1 . 9
4.2.3 Operating class 2 . 9
4.2.4 Operating class 3 . 9
4.3 Measuring range / percentage operating uncertainty of reading . 9
4.3.1 General . 9
4.3.2 Measuring range of an operating class 1 current sensor . 10
4.3.3 Measuring range of an operating class 2 current sensor . 10
4.3.4 Measuring range of an operating class 3 current sensor . 10
4.4 Reference conditions . 12
4.5 Minimum rated operating conditions . 13
4.6 Mechanical requirements . 15
4.7 Pollution degree . 15
4.8 Measurement category . 15
4.9 Electromagnetic compatibility (EMC) . 15
5 Marking and operating instructions . 15
5.1 Marking . 15
5.2 Operating instructions . 16
6 Tests . 16
6.1 Type tests . 16
6.1.1 Electrical safety . 16
6.1.2 Variations . 16
6.1.3 Percentage operating uncertainty . 17
6.1.4 Marking and operating instructions . 17
6.2 Routine tests . 17
6.2.1 Intrinsic uncertainty . 17
6.2.2 Marking and operating instructions . 17
Annex A (informative) Examples of measurement applications . 18
Bibliography . 19

Figure 1 – Percentage operating uncertainty in relation to operating class and external
magnetic field for measuring ranges less than or equal to 10 mA . 11
Figure 2 – Percentage operating uncertainty in relation to operating classes and
external magnetic field and measuring ranges greater than10 mA . 12
Figure 3 – Reference position for two straight conductors (for differential method) . 13
Figure 4 – Example of operating positions for differential method . 15
Figure 5 – Example for an applicable pictogram for operating class 1 . 16

61557-13  IEC:2011 – 3 –
Figure A.1 – Example for measurement of protective conductor current – Direct method . 18
Figure A.2 – Example for measurement of leakage current including protective
conductor current – Differential method . 18

Table 1 – Relation of external field and operating class . 10
Table 2 – Calculation of percentage operating uncertainty . 14

– 4 – 61557-13  IEC:2011
INTERNATIONAL ELECTROTECHNICAL COMMISSION
_____________
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 13:Hand-held and hand-manipulated current clamps and sensors
for measurement of leakage currents in electrical distribution systems

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
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9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 61557-13 has been prepared by IEC technical committee TC85:
Measuring equipment for electrical and electromagnetic quantities.
The text of this standard is based on the following documents:
FDIS Report on voting
85/387/FDIS 85/391/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.

61557-13  IEC:2011 – 5 –
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
This part is to be used in conjunction with IEC 61557-1:2007.
A list of all parts of the IEC 61557 series, published under the general title 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, can be found on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
– 6 – 61557-13  IEC:2011
INTRODUCTION
During periodical inspections of electrical installations, it is increasingly difficult to carry out
measurements of insulation resistances with devices according to IEC 61557-2 when the
installations cannot be switched off for long periods and when there are sensitive appliances
connected. Therefore, the measurement of leakage currents can provide additional
information about the safe or unsafe situation of an installation.
Furthermore, the user has the opportunity to place current clamps and sensors on different
points of the distribution system for troubleshooting nuisance tripping of RCDs, alarms of
RCMs and other problems caused by low frequency leakage currents.
Unfortunately, the presence of high external magnetic fields has a big impact on the
performance of commonly used current clamps and sensors. High uncertainty and non-
repeatability of readings can lead to unsafe interpretations.
This standard defines performance classes for current clamps and sensors in relationship to
ranges of high external magnetic fields and gives guidance to the user to choose the
appropriate measuring device for a given situation.

61557-13  IEC:2011 – 7 –
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 13:Hand-held and hand-manipulated current clamps and sensors
for measurement of leakage currents in electrical distribution systems

1 Scope
This part of IEC 61557 defines special performance requirements for hand-held and hand-
manipulated current clamps and sensors for measurement of leakage currents in electrical
distribution systems up to 1 000 V a.c. and 1 500 V d.c., taking into account the influence of
high external low-frequency magnetic fields and other influencing quantities. This standard
does not apply to current clamps or sensors which are used in combination with devices for
insulation fault location according to IEC 61557-9, unless it is specified by the manufacturer.
2 Normative references
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.
IEC 61000-4-8:2009, Electromagnetic compatibility (EMC) – Part 4-8: Testing and
measurement techniques – Power frequency magnetic field immunity test
IEC 61010-1, Safety requirements for electrical equipment for measurement, control and
laboratory use – Part 1: General requirements
IEC 61010-2-030, Safety requirements for electrical equipment for measurement, control, and
laboratory use – Part 2-030: Particular requirements for testing and measuring circuits
IEC 61010-2-032:2002, Safety requirements for electrical equipment for measurement, control,
and laboratory use – Part 2-032: Particular requirements for hand-held and hand-manipulated
current sensors for electrical test and measurement
IEC 61326-1, Electrical equipment for measurement, control and laboratory use – EMC
requirements – Part 1: General requirements
IEC 61326-2-2, Electrical equipment for measurement, control and laboratory use – EMC
requirements – 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
IEC 61557-1:2007, 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 1:
General requirements
3 Terms and definitions
For the purposes of this document, the definitions given in IEC 61557-1 and the following
definitions apply.
– 8 – 61557-13  IEC:2011
3.1
hand-held and hand-manipulated current clamps and sensors
portable or hand-held device for measurement, display or for indication of types of leakage
currents in distribution systems without interruption of these circuits including defined
attached equipment
NOTE In the following text, only the expression “current sensors” is used.
3.2
fixing device
device to fix the position of a conductor in relation to the current sensors
3.3
measurement category
coordination of maximum transients to the working voltage according to IEC 61010-2-030
3.4
variation E
variation due to external low frequency magnetic fields
3.5
variation E
variation due to load current during measurement using the differential method (see Annex A,
Figure A.2)
3.6
variation E
variation due to touch current caused by common mode voltage during hand-manipulation
3.7
variation E
variation due to frequency
3.8
variation E
repeatability of the measurement readings due to at least 10 open / close cycles
3.9
operating class
performance class defining the influence of external low frequency magnetic fields on the
current sensors (see 4.2)
3.10
leakage current
current driven by active conductors of a distribution system and/or loads to earth and/or
protective conductors
[IEC 60050-195:1998, 195-05-15, modified]
3.11
load current
current flowing through the line conductor/s
3.12
rated burden
the value of the burden on which the accuracy requirements of a specification are based
[IEC 60050-321:1986, 321-01-26]

61557-13  IEC:2011 – 9 –
4 Requirements
4.1 General
The following requirements as well as those given in IEC 61557-1 shall apply.
Current sensors according to this standard shall comply with IEC 61010-2-032.
Current sensors according to this standard shall have the ability to measure leakage currents
from 1 mA to 10 A a.c. and/or d.c. as a minimum and shall be designed for a load current of at
least 60 A. Multiple ranges are allowed.
The resolution shall be 0,1 mA a.c. and/or d.c or better.
The indicated current values shall be r.m.s. values.
The frequency range of the current sensors shall include the range beginning at 40 Hz up to
the third harmonic of the rated mains frequency at the minimum.
NOTE 1 For railway applications a frequency range beginning at 15 Hz is recommended.
NOTE 2 For industrial applications a frequency range up to 1 kHz is recommended.
NOTE 3 For testing the leakage current of appliances a measuring range starting at 0,1 mA with a resolution of
0,01 mA is recommended.
4.2 Operating classes
4.2.1 General
According to their sensitivity for low frequency magnetic fields according to IEC 61000-4-8
within the range of 15 Hz up to 400 Hz, current sensors are classified into 3 operating classes.
4.2.2 Operating class 1
Current sensors of operating class 1 shall be applicable to operate within external low
frequency magnetic fields according to 4.2.1 up to a field strength of 100 A/m. The upper limit
of field strength shall be marked on the pictogram according to 5.1.
4.2.3 Operating class 2
Current sensors of operating class 2 shall be applicable to operate within external low-
frequency magnetic fields according to 4.2.1 up to a field strength of 30 A/m. The upper limit
of field strength shall be marked on the pictogram according to 5.1.
4.2.4 Operating class 3
Current sensors of operating class 3 shall be applicable to operate within external low
frequency magnetic fields according to 4.2.1 up to a field strength of 10 A/m. The upper limit
of field strength shall be marked on the pictogram according to 5.1.
4.3 Measuring range / percentage operating uncertainty of reading
4.3.1 General
Percentage operating uncertainty of current sensors of operating class 1, operating class 2
and operating class 3 shall be determined according to the equation of Table 2 within the
operating conditions of 4.4. The relation between operating class and external magnetic field
is shown in Figure 1, Figure 2 and Table 1.

– 10 – 61557-13  IEC:2011
The fiducial value is the measured value of the leakage current.
4.3.2 Measuring range of an operating class 1 current sensor
The measuring range of an operating class 1 current sensor is the range of indicated values
between stated lower and upper measurements for which the percentage operating
uncertainty of reading is:
– less than 15 % for values less than or equal to 10 mA, and is less than 10 % for values
greater than 10 mA for external low frequency magnetic fields of up to 10 A/m;
and
– less than 20 % for values less than or equal to 10 mA and is less than 12.5 % for values
greater than 10 mA for external low frequency magnetic fields of up to 30 A/m;
and
– less than 30 % for values less than or equal to 10 mA, and is less than 15 % for values
greater than10 mA for external low frequency magnetic fields of up to 100 A/m.
4.3.3 Measuring range of an operating class 2 current sensor
The measuring range of an operating class 2 current sensor is the range of indicated values
between stated lower and upper measurements for which the percentage operating
uncertainty of reading is:
– less than 15 % for values less than or equal to 10 mA and is less than 10 % for values
greater than10 mA for external low frequency magnetic fields of up to 10 A/m;
and
– less than 20 % for values less than or equal to 10 mA and is less than 12,5 % for values
greater than 10 mA for external low frequency magnetic fields of up to 30 A/m.
4.3.4 Measuring range of an operating class 3 current sensor
The measuring range of an operating class 3 instrument is the range of indicated values
between stated lower and upper measurements for which the percentage operating
uncertainty of reading is:
– less than 15 % for values less than or equal to 10 mA and is less than 10 % for values
greater than10 mA for external low frequency magnetic fields of up to 10 A/m.
Table 1 – Relation of external field and operating class
External field strength 10 A/m 30A/m 100A/m
Percentage operating uncertainty of reading  ≤10 mA 15% 20% 30%
Percentage operating uncertainty of reading  >10 mA 10% 12,5 % 15%
Operating class 1 current sensor
  
Operating class 2 current sensor
-
 
Operating class 3 current sensor
 - -
61557-13  IEC:2011 – 11 –
+30
+20
+15
10 30 100
External magnetic
field A/m
–15
–20
–30
Operating class 3
Operating class 2
Operating class 1
IEC  1544/11
Figure 1 – Percentage operating uncertainty in relation to operating class and external
magnetic field for measuring ranges less than or equal to 10 mA

Percentage operating uncertainty %

– 12 – 61557-13  IEC:2011
+15
+12,5
+10
10 30 100
External magnetic
–10
field A/m
–12,5
–15
–30
Operating class 3
Operating class 2
Operating class 1
IEC  1545/11
Figure 2 – Percentage operating uncertainty in relation to operating classes and
external magnetic field and measuring ranges greater than10 mA
4.4 Reference conditions
The following reference conditions apply:
– mains frequency ±1 %;
– reference temperature: 23 °C ± 2 °C (E );
– reference position (E ):
– clamp jaws at 90° (±5°) to straight conductors,
– conductors of 6 mm cross section located within the centre (±5 %) of the clamp jaws
– for differential method two straight conductors as close as possible are required (see
Figure 3)
1 %) (E );
– rated supply voltage or rated voltage of battery (±
– fiducial value of load current (±5 %) within 50 % and 100 % of the nominal range
according to manufacturer’s specification (E );
– no low frequency external magnetic field (according to IEC 61000-4-8, Annex D) (E );
– sinusoidal leakage current (THD <4 %) (E );
– current sensor insulated from earth or configuration according manufacturer’s
specification;
– rated range of burden according manufacturer’s specification, if applicable.
Percentage operating uncertainty %

61557-13  IEC:2011 – 13 –
90° ± 5°
IEC  1546/11
Figure 3 – Reference position for two straight conductors (for differential method)
4.5 Minimum rated operating conditions
The stated percentage operating uncertainties shall apply under the following rated operating
conditions:
– reference position ±30°, for any position of conductors within the clamp jaws, if no fixing
device is specified (E );
– for differential method, two straight parallel conductors of 6 mm cross section as far apart
as possible within the clamp jaws are required (Figure 4);
– rated range of supply voltage (or rated voltage range of batteries if applicable) (E );
– temperature range 0 °C to +35 °C (E ) or extended range specified by the manufacturer;
– distorted waveform of leakage current, see Table 2 (E );
– external low frequency magnetic field within the limits of 4.2 (E );
– rated range of load current (E );
– touch current through circuit A1 according to IEC 61010-1 between hand-held parts
(covered with metal foil) and earth. Conductor held at maximum common mode voltage
and highest rated frequency (E );
– rated range of frequency (E );
– repeatability of the measurement readings due to at least 10 open / close cycles (E ).
– 14 – 61557-13  IEC:2011
Table 2 – Calculation of percentage operating uncertainty
Intrinsic Reference conditions or specified operating range Designation Requirements or Type of
uncertainty or tests in accordance test
code
influence with the relevant
quantity parts of IEC 61557
Intrinsic Reference conditions A Part 13, 4.4, 6.2 R
uncertainty
Position E Part 13, 4.5 T
Reference position ±30°, for any position within the
clamp jaws, if no fixing device is specified
Supply voltage At the limits stated by the manufacturer E Part 1, 4.2, 4.3 T
Temperature 0°C to +35 °C or extended range specified by the E Part 1, 4.2 T
manufacturer
rd
Distorted 5% 3 harmonic of the nominal frequency at 0° E Part 1, 4.1 T
waveform
th
6% 5 . harmonic of the nominal frequency at 180°
th
5% 7 . harmonic of the nominal frequency at 0°
External low Operating class 1 at 100 A/m E Part 13 4.2 T
frequency
30 A/m
magnetic field
15 Hz to
10 A/m
400 Hz
according to Operating class 2 at 30 A/m
IEC 61000-4-8
10 A/m
Operating class 3 at 10 A/m
Load current Nominal range of load current according to E Part 13, 4.1 T
manufacturer’s specification
Touch current Touch current through circuit A1 according to E Part 13, 4.5 T
caused by IEC 61010-1 between hand-held parts (covered with
common mode metal foil) and earth. Conductor held at maximum
voltage common mode voltage and highest rated mains
frequency.
Frequency Rated frequency range according to manufacturer’s E Part 13, 4.1 T
specification
Repeatability Difference between the highest and lowest value of E Part 13, 4.5 R
the intrinsic uncertainty
Percentage Part 13, 4.5 T
2 2 2 2 2 2 2 2 2
| | �
B=±( A +1,15 E +E +E +E +E +E +E +E +E
1 2 3 9 11 12 13 14 15
operating
uncertainty
A = intrinsic uncertainty
E = variations
n
R = routine test
T = type test
B
B [%] = ± x 100%
fiducial value
NOTE The intrinsic uncertainty A is to be determined at least at the upper and lower limit of the measuring range.
Digitizing error, nonlinearity and traceability are to be taken into account. The highest value is to be used for the calculation
of the operating uncertainty.
61557-13  IEC:2011 – 15 –
30°
IEC  1547/11
Figure 4 – Example of operating positions for differential method
4.6 Mechanical requirements
Current sensors of operating classes 1, 2 and 3 according to this standard shall comply with
the requirements of IEC 61010-2-032:2002, Clause 8.
4.7 Pollution degree
Current sensors according to this standard shall be designed at least for pollution degree 2
according to IEC 61010-1.
4.8 Measurement category
Current sensors according to this standard shall be designed at least for measurement
category III and minimum working voltage of 300 V according to IEC 61010-1.
4.9 Electromagnetic compatibility (EMC)
Current sensors according to this standard shall comply with the requirements of
IEC 61326-2-2 or IEC 61326-1, whichever is applicable. Immunity values shall comply with
those for industrial locations, emission values shall comply with those for residential locations.
5 Marking and operating instructions
5.1 Marking
5.1.1 Current sensors according to this standard shall be marked with a framed pictogram
which warns not to exceed the permissible limits of external low frequency magnetic fields
related to the operating class. This pictogram shall be clearly visible in normal position. The
colour of the frame and pictogram shall contrast with the background. Figure 5 shows an
example for an applicable pictogram for operating class 1.

– 16 – 61557-13  IEC:2011
IEC  1548/11
Figure 5 – Example for an applicable pictogram for operating class 1
5.1.2 Current sensors according to this standard shall be marked with the measuring range in
accordance with 4.3.
In addition, maximum load current and rated range of frequency according to 4.1 shall be
marked.
5.1.3 The intrinsic uncertainty shall not be marked on the current sensors.
NOTE The marking with the percentage operating uncertainty is allowed.
5.2 Operating instructions
5.2.1 Operating instructions of current sensors according to this standard shall be in
compliance with the requirements of IEC 61557-1 and IEC 61010-2-032 and shall provide
additional information according to 5.1.
5.2.2 Operating instructions shall include statements about optimized positioning of the
current sensors and evaluation of influences caused by low frequency external magnetic
fields and caused by contamination of the jaws. If necessary, instructions about fixing devices
shall be added.
5.2.3 Operating instructions shall include statements about rated burden, if applicable.
5.2.4 Operating instructions shall include information about the relationship between load
current and measuring range for the differential method.
5.2.5 Operating instructions shall include information about the recommended recalibration
period.
5.2.6 The pictogram Figure 5 shall be listed under “Warning symbols” and shall be explained
sufficiently.
6 Tests
In addition to IEC 61557-1 the following tests shall be performed.
6.1 Type tests
6.1.1 Electrical safety
The electrical safety of current sensors according to this standard shall be verified according
to IEC 61010-2-032 (type test).
6.1.2 Variations
Variations for current sensors according to this standard shall be verified according to Table 2
under minimum rated operating conditions according to 4.5 (type test).

61557-13  IEC:2011 – 17 –
6.1.3 Percentage operating uncertainty
The percentage operating uncertainty B of current sensors according to this standard shall be
calculated using the equation of Table 2 and taking into account the variations verified under
6.3 (type test).
6.1.4 Marking and operating instructions
The existence of information according to 5.2 shall be verified (type test).
6.2 Routine tests
6.2.1 Intrinsic uncertainty
The intrinsic uncertainty A of current sensors according to this standard under reference
conditions specified by the manufacturer shall be verified (routine test).
6.2.2 Marking and operating instructions
The existence of marking and pictogram according to 5.1 shall be verified (routine test).

– 18 – 61557-13  IEC:2011
Annex A
(informative)
Examples of measurement applications

Figure A.1 shows an example for measurement of protective conductor current with the direct
method.
L
N
PE
Load 1 Load n
IEC  1549/11
Figure A.1 – Example for measurement of protective conductor current – Direct method
Figure A.2 shows an example for measurement of leakage current and including protective
conductor current with the differential method.
L
N
PE
Load 1 Load n
IEC  1550/11
Figure A.2 – Example for measurement of leakage current including protective
conductor current – Differential method
NOTE The examples in Figure A.1 and Figure A.2 are related to single-phase circuits. However, these examples
of measurements are also valid for three-phase and three-phase and neutral circuits.

61557-13  IEC:2011 – 19 –
Bibliography
IEC 60359, Electrical and electronic measurement equipment – Expression of the
performance
___________
– 20 – 61557-13  CEI:2011
SOMMAIRE
AVANT-PROPOS . 22
INTRODUCTION . 24
1 Domaine d’application . 25
2 Références normatives . 25
3 Termes et définitions . 26
4 Exigences . 27
4.1 Généralités. 27
4.2 Classes de fonctionnement . 27
4.2.1 Généralités . 27
4.2.2 Classe 1 de fonctionnement . 27
4.2.3 Classe 2 de fonctionnement . 27
4.2.4 Classe 3 de fonctionnement . 28
4.3 Plage de mesure / Incertitude de fonctionnement en pourcentage de relevé . 28
4.3.1 Généralités . 28
4.3.2 Plage de mesure d’un capteur de courant de classe 1 de
fonctionnement . 28
4.3.3 Plage de mesure d’un capteur de courant de classe 2 de
fonctionnement . 28
4.3.4 Plage de mesure d’un capteur de courant de classe 3 de
fonctionnement . 28
4.4 Conditions de référence . 30
4.5 Conditions de fonctionnement assignées minimales . 31
4.6 Exigences mécaniques . 33
4.7 Degré de pollution . 33
4.8 Catégorie de mesure . 33
4.9 Compatibilité électromagnétique (CEM) . 33
5 Marquage et instructions de fonctionnement . 33
5.1 Marquage . 33
5.2 Instructions de fonctionnement . 34
6 Essais . 34
6.1 Essais de type . 34
6.1.1 Sécurité électrique. 34
6.1.2 Variations . 35
6.1.3 Incertitude de fonctionnement en pourcentage . 35
6.1.4 Marquage et instructions de fonctionnement . 35
6.2 Essais individuels de série . 35
6.2.1 Incertitude intrinsèque . 35
6.2.2 Marquage et instructions de fonctionnement . 35
Annexe A (informative) Exemples d’applications de mesures . 36
Bibliographie . 37

Figure 1 – Incertitude de fonctionnement en pourcentage par rapport à la classe de
fonctionnement et au champ magnétique externe pour plages de mesure inférieures
ou égales à 10 mA . 29
Figure 2 – Incertitude de fonctionnement en pourcentage par rapport aux classes de
fonctionnement et au champ magnétique externe et plages de mesure supérieures à
10 mA . 30

61557-13  CEI:2011 – 21 –
Figure 3 – Position de référence pour deux conducteurs droits (pour méthode
différentielle). 31
Figure 4 – Exemple de positions de fonctionnement pour la méthode différentielle . 33
Figure 5 – Exemple de pictogramme applicable pour la classe de fonctionnement 1 . 34
Figure A.1 – Exemple de mesure du courant dans le conducteur de protection –
Méthode directe . 36
Figure A.2 – Exemple de mesure du courant de fuite, dont le courant dans le
conducteur de protection – Méthode différentielle . 36

Tableau 1 – Relation entre le champ externe et la classe de fonctionnement . 29
Tableau 2 – Calcul de l’incertitude de fonctionnement en pourcentage . 32
...