IEC 61557-14:2013

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 14: Equipment for testing the safety of electrical equipment for machinery

IEC 61557-14:2013 defines special requirements for test and measurement equipment used to determine the electrical safety of electrical equipment of machinery according to IEC 60204-1. IEC 61010 and the existing parts of series IEC 61557 do not cover all safety aspects of testing electrical equipment of machinery. IEC 61557-14 provides additional protection against electric shock for the testing person and bystanders during high-voltage-tests and in case of unintended use of the test equipment. It defines performance requirements for each measuring and testing function to ensure comparable results.

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 14: Dispositifs de contrôle de la sécurité des appareils électriques sur machines

La CEI 61557-14:2013 définit les exigences particulières applicables aux dispositifs de contrôle et de mesure destinés à déterminer la sécurité électrique des appareils électriques sur machines conformément à la CEI 60204-1. La CEI 61010 et les parties existantes de la série CEI 61557 ne couvrent pas tous les aspects de sécurité liés aux essais des appareils électriques sur machines. La CEI 61557-14 fournit des informations supplémentaires de protection contre les chocs électriques destinées à la personne effectuant les essais ou à toute personne présente, au cours d'essais à haute tension et dans le cas d'une mauvaise utilisation du dispositif d'essai. Elle définit les exigences de performances pour chaque fonction de mesure et d'essai afin de garantir l'obtention de résultats comparables.

General Information

• Status: Published
• Publication Date: 10-Apr-2013
• 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 61557-14:2023 - 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 14: Equipment for testing the safety of electrical equipment of machinery
• Effective Date: 05-Sep-2023

Overview

IEC 61557-14:2013 is an international standard published by the International Electrotechnical Commission (IEC) that addresses electrical safety in low voltage distribution systems up to 1,000 V AC and 1,500 V DC. This part of the IEC 61557 series focuses on equipment for testing the safety of electrical equipment used in machinery. It establishes special safety and performance requirements for test and measurement instruments designed to verify compliance with IEC 60204-1 - the standard on electrical equipment of machines.

The key objective of IEC 61557-14 is to provide enhanced protection for personnel who perform electrical safety tests, especially during high-voltage testing scenarios. It supplements existing standards such as IEC 61010 and other IEC 61557 parts by addressing safety concerns unique to machinery testing, reducing risks from electric shock for both the testing operator and bystanders.

Key Topics

• Scope and Application
  Defines requirements for test instruments used on machinery electrical equipment with voltages up to 1,000 V AC and 1,500 V DC in industrial environments.

• Safety Requirements
  Additional protective measures against electric shock, emphasizing safe handling during high-voltage insulation resistance and dielectric strength tests.

• Performance Criteria
  Specifies measurement accuracy and testing functions to ensure consistent and comparable test results across different equipment.

• Measurement Functions Covered:

  • Protective bonding resistance
  • Loop resistance
  • Insulation resistance
  • Residual current device (RCD) effectiveness
  • Dielectric strength
  • Residual voltage
  • Leakage current

• Construction Requirements
  Includes the durability of terminals, degree of enclosure protection (IP rating), overload capability, electromagnetic compatibility (EMC), and mechanical robustness.

• Marking and Instructions
  Specifies clear marking for identification and detailed operating instructions to promote proper test equipment use.

• Testing and Validation
  Procedures for confirming operational uncertainty, environmental variations (temperature, voltage supply fluctuations), and resilience against interference.

Applications

IEC 61557-14 is essential for manufacturers, testers, maintenance technicians, and safety inspectors working with electrical machinery in industrial and manufacturing sectors. Its practical applications include:

• Machine Safety Verification
  Ensuring that electrical equipment integrated into machinery complies with safety standards prior to commissioning.

• Periodic Safety Testing
  Supporting regular maintenance programs to detect insulation degradation, protective bonding integrity, and RCD functionality.

• Risk Mitigation
  Protecting personnel from electrical hazards during diagnostic and commissioning tests using compliant test instruments.

• Quality Assurance and Compliance
  Aiding in certification processes by providing standardized measurement methods and equipment requirements.

Related Standards

Understanding IEC 61557-14 is complemented by awareness of several related international standards:

• IEC 60204-1: Safety of machinery - Electrical equipment of machines - General requirements. This standard outlines the overall safety requirements for machinery electrical systems, which IEC 61557-14 test equipment helps verify.

• IEC 61010 Series: Safety requirements for electrical equipment for measurement, control, and laboratory use, providing foundational safety rules for test instruments.

• IEC 60529: Degrees of protection provided by enclosures (IP Code), relevant for the physical protection of testing equipment.

• IEC 61000-4-8: Electromagnetic compatibility (EMC) testing, ensuring test instruments can operate reliably in industrial electromagnetic environments.

• Other parts of IEC 61557: Covering protective measure testing in low voltage electrical installations beyond machinery-specific applications.

---

Why IEC 61557-14 Matters

Adopting IEC 61557-14 ensures that test equipment used in machinery safety diagnostics is subject to rigorous safety and performance standards. This protects users, enhances the reliability of safety testing, and supports industry compliance efforts. For professionals involved in electrical safety testing, this standard is critical for selecting, operating, and maintaining test instruments that meet international safety benchmarks.

Standards Content (Sample)

IEC 61557-14 ®
Edition 1.0 2013-04
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 14: Equipment for testing the safety of electrical equipment of machinery

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 14: Dispositifs de contrôle de la sécurité des appareils électriques sur
machines
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IEC 61557-14 ®
Edition 1.0 2013-04
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 14: Equipment for testing the safety of electrical equipment of machinery

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 14: Dispositifs de contrôle de la sécurité des appareils électriques sur

machines
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
Q
CODE PRIX
ICS 17.220.20; 29.080.01; 29.240.01 ISBN 978-2-83220-694-2

– 2 – 61557-14 © IEC:2013
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 8
4 Requirements . 8
4.1 General requirements . 8
4.2 Measuring quantities . 8
4.2.1 General . 8
4.2.2 Measurement of resistance of protective bonding . 9
4.2.3 Measurement of loop resistance . 9
4.2.4 Measurement of insulation resistance . 9
4.2.5 Testing of the effectiveness of protective measures with RCD . 9
4.2.6 Testing of dielectric strength . 9
4.2.7 Measurement of residual voltage . 10
4.2.8 Measurement of leakage current . 10
4.3 Construction requirements for testing equipment . 10
4.3.1 Overload capability . 10
4.3.2 Terminals . 10
4.3.3 Sockets for service purposes . 10
4.3.4 Degree of protection . 10
4.3.5 Class of protection . 11
4.3.6 Resistance of protective bonding . 11
4.3.7 Battery control . 11
4.3.8 Mechanical requirements . 11
4.3.9 Pollution degree . 11
4.3.10 Overvoltage and measurement categories . 11
4.3.11 Electromagnetic compatibility (EMC) . 11
4.3.12 Accessories . 11
5 Markings and operating instructions . 11
5.1 Markings . 11
5.2 Operating instructions . 12
6 Tests . 12
6.1 General . 12
6.2 Operating uncertainty . 12
6.3 Variations . 14
6.3.1 Variation due to position . 14
6.3.2 Variation due to supply voltage . 14
6.3.3 Variation due to temperature . 14
6.3.4 Variation due to phase angle of loop impedance . 14
6.3.5 Variation due to system frequency . 14
6.3.6 Variation due to system voltage . 14
6.3.7 Variation due to harmonics . 14
6.3.8 Variation due to d.c. quantities . 15
6.3.9 Variations due to external low frequency magnetic field (if applicable) . 15
6.3.10 Variations due to load current (if applicable) . 15

61557-14 © IEC:2013 – 3 –
6.3.11 Variations due to touch current caused by common mode voltage (if
applicable) . 15
6.3.12 Variations due to frequency of measured current (if applicable) . 15
6.3.13 Variations due to repeated clamping (if applicable) . 15
6.4 Tests of measuring equipment according to measuring functions. 15
6.5 Test of construction requirements of test equipment . 16
Bibliography . 17

Table 1 – Test voltages . 9
Table 2 – Determination of operating uncertainty . 13
Table 3 – Compliance tests of measuring equipment according to measuring function . 16
Table 4 – Test of construction requirements of test equipment . 16

– 4 – 61557-14 © IEC:2013
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
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 14: Equipment for testing the safety of
electrical equipment of machinery

FOREWORD
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patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 61557-14 has been prepared by IEC technical committee 85:
Measuring equipment for electrical and electromagnetic quantities.
The text of this standard is based on the following documents:
FDIS Report on voting
85/446/FDIS 85/450/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.

61557-14 © IEC:2013 – 5 –
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all the parts in 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 – 61557-14 © IEC:2013
INTRODUCTION
IEC 61010 and the existing parts of series IEC 61557 do not cover all safety aspects of
testing electrical equipment of machinery. This part of IEC 61557 provides additional
protection against electric shock for the testing person and bystanders during high-voltage-
tests and in case of unintended use of the test equipment. It defines performance
requirements for each measuring and testing function to ensure comparable results.

61557-14 © IEC:2013 – 7 –
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 14: Equipment for testing the safety of
electrical equipment of machinery

1 Scope
This part of IEC 61557 defines special requirements for test and measurement equipment
used to determine the electrical safety of electrical equipment of machinery according to
IEC 60204-1.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and
are indispensable for its application. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 60204-1, Safety of machinery – Electrical equipment of machines – Part 1: General
requirements
IEC 60529, Degrees of protection provided by enclosures (IP Code)
IEC 61000-4-8, Electromagnetic compatibility – Part 4-8: Testing and measurement
techniques – Power frequency magnetic field immunity test
IEC 61010-1:2010, Safety requirements for electrical equipment for measurement, control,
and laboratory use – Part 1: General requirements
IEC 61010-031, Safety requirements for electrical equipment for measurement, control and
laboratory use – Part 031: Safety requirements for hand-held probe assemblies for electrical
measurement and test
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, 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 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
IEC 61557-2, 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 2:
Insulation resistance
– 8 – 61557-14 © IEC:2013
IEC 61557-3:2007, 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 3:
Loop impedance
IEC 61557-4, 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 4:
Resistance of earth connection and equipotential bonding
IEC 61557-6, 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:
Effectiveness of residual current devices (RCD) in TT, TN and IT systems
IEC 61557-10, 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 10: Combined measuring equipment for testing, measuring or monitoring of protective
measures
IEC 61557-13:2001, 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
3 Terms and definitions
For the purpose of this document, the terms and definitions given in IEC 61557-1,
IEC 61557-2, IEC 61557-3, IEC 61557-4, IEC 61557-6, IEC 61557-10 and IEC 61557-13
apply.
4 Requirements
4.1 General requirements
The following requirements as well as those given in IEC 61557-1 shall apply with the
exception of the influence quantities E (variation due to interference voltages) and E
4 5
(variation due to earth electrode resistance). In addition, the applicable requirements of
IEC 61557-13 shall apply.
4.2 Measuring quantities
4.2.1 General
The measuring equipment shall be capable of measuring at least the following measuring
quantities:
– resistance of protective bonding;
– loop impedance;
– effectiveness of residual current protective devices (RCDs);
– insulation resistance.
The combination with the following measuring functions is possible:
– dielectric strength;
– residual voltage;
– leakage current / protective conductor current.
The combination with further measuring functions is possible, provided that the measuring
functions listed above will not be influenced.

61557-14 © IEC:2013 – 9 –
NOTE A missing measuring function in combined equipment can be completed with a single instrument designed
according to the IEC 61557 series.
4.2.2 Measurement of resistance of protective bonding
The measuring equipment shall be in compliance with IEC 61557-4.
4.2.3 Measurement of loop resistance
The measuring equipment shall be in compliance with IEC 61557-3.
4.2.4 Measurement of insulation resistance
The measuring equipment shall be in compliance with IEC 61557-2.
4.2.5 Testing of the effectiveness of protective measures with RCD
The measuring equipment shall be in compliance with IEC 61557-6.
4.2.6 Testing of dielectric strength
If the equipment includes a dielectric strength test, it shall generate a sinusoidal voltage at
mains frequency with values according to Table 1:
Table 1 – Test voltages
Nominal voltage U of Test voltage
n
unit under test (UT)
≤ 500 V 1 000 V
> 500 V 2 × U
n
The test equipment shall be able of delivering a test current of 100 mA at the minimum and
200 mA at the maximum.
If the test equipment has a display to indicate the test voltage, the maximum operating
uncertainty shall be ± 5 %.
The uncertainty in the output of the applied test voltage for an unloaded (open circuit)
condition or loaded such that a current of 100 mA is produced, shall be within between -10 %
and +30 % of the voltage setting.
For protection against electric shock, the following protective measures are required:
– hardware or software key with ON/OFF function;
– additional switching device for the testing output, protected against unintended switching
(e.g. barriers, shrouds, etc.);
– red control lamp indicating that a hazardous voltage is applied to the output circuit;
– continuous two-handed operation for the output circuit.
If during two-handed operation both hands will be removed, the output circuit shall be
separated by electrical or mechanical means from all output terminals. If only one hand will be
removed, the separation from the relevant output terminal shall fulfil the requirements of
IEC 61010-1 for BASIC INSULATION.
In case of electrical separation the switching time to reach a voltage level less than 50 V
between the output terminals shall be 0,1 s.

– 10 – 61557-14 © IEC:2013
If two-handed operation is interrupted by removing one hand, the touch current flowing from
the remaining contact to earth, measured with a current measuring circuit according to
Figure A.1of IEC 61010-1:2010 shall be below 3,5 mA.
The impedance of the output circuit to earth shall be ≥ 1 MΩ.
The test duration shall be according to IEC 60204-1.
4.2.7 Measurement of residual voltage
If the equipment has the ability to measure the residual voltage, the operating uncertainty to
measure this voltage shall be within 0 % to +15 % of the 60 V limit, and the operating
uncertainty to set the measuring time limit shall be within 0 % and -15 % of the 1 s limit or 5 s
limit. Evaluated voltages in linear systems shall be calculated as if they were measured during
the highest amplitude of the interrupted voltage. If the manufacturer specifies the test
equipment to be used in non-linear systems, the measuring method shall be explained in the
operating instructions.
The input impedance of the voltage measurement circuit shall be at least 20 MΩ.
4.2.8 Measurement of leakage current
If the measuring equipment has the ability to measure leakage currents, the equipment shall
be in compliance with the requirements of IEC 61557-13. If other equipment or methods as
described in IEC 61557-13 are used, performance and safety shall have at least the same
level as in IEC 61557-13.
The manufacturer has to specify the input characteristics including the bandwidth of the input
circuit.
4.3 Construction requirements for testing equipment
4.3.1 Overload capability
The overload capability of combined measuring equipment shall be in compliance with the
requirements of IEC 61557-10. In addition, no hazard shall arise for the user when the highest
value of the high-voltage output is accidentally applied to the external distribution system.
Protective devices may be activated. The loop impedance of the external circuit shall be ≤ 2 Ω.
4.3.2 Terminals
All terminals shall be designed in such a way that during connection no unintended touching
of hazardous live parts is possible.
4.3.3 Sockets for service purposes
Sockets for the connection of further external equipment shall be clearly marked. Protection
against overcurrent and short-circuits shall be provided. Protection against electric shock
shall be achieved by using an RCD with a tripping current of 30 mA at the maximum. All
protective measures may be covered by the distribution system. In this case the inner wiring
of the socket shall be designed according to the maximum nominal current, but at least 16 A.
4.3.4 Degree of protection
The degree of protection for the enclosure, except service-sockets and terminals, shall be at
least IP40 in accordance with IEC 60529.

61557-14 © IEC:2013 – 11 –
4.3.5 Class of protection
Measuring equipment intended to be hand-held during measurement shall be double insulated
according to IEC 61010-1 and IEC 61010-2-030. Other equipment may be protected by
protective bonding.
4.3.6 Resistance of protective bonding
The resistance between protective conductor terminal and connected conductive parts
including the protective conductor terminal of service-sockets shall not exceed 0,1 Ω.
4.3.7 Battery control
Battery control circuits shall comply with IEC 61557-1:2007, 4.3.
4.3.8 Mechanical requirements
See IEC 61557-1:2007, 4.10.
4.3.9 Pollution degree
See IEC 61557-1:2007, 4.6.
4.3.10 Overvoltage and measurement categories
4.3.10.1 Overvoltage category
The supply circuit of the testing equipment shall be rated at least for overvoltage category II
according to IEC 61010-1.
4.3.10.2 Measurement category
Measuring circuits of the test equipment shall be rated at least for CAT III according to
IEC 61010-2-030, except the measuring circuit for insulation resistance and the high-voltage-
test-circuit. The measuring circuit for insulation resistance shall be rated for at least CAT II;
the high-voltage-test-circuit may be classified as secondary circuit according to IEC 61010-1,
if the circuit is separated from the main circuit by a transformer.
4.3.11 Electromagnetic compatibility (EMC)
The measuring equipment shall be in compliance with the requirements of IEC 61326-2-2 and
in addition with the requirements of IEC 61326-1 for industrial locations.
4.3.12 Accessories
Specified accessories shall comply with the requirements of IEC 61010-031.
5 Markings and operating instructions
5.1 Markings
In addition to the requirements of IEC 61010-1, IEC 61010-2-030, IEC 61557-1 and other
applicable parts of IEC 61557, the measuring equipment shall have the following markings
clearly visible:
– service-socket, if applicable, with maximum rated current;
– test and measurement terminals;
– measuring function;
– 12 – 61557-14 © IEC:2013
– instructions for connection.
5.2 Operating instructions
Additional to the requirements of IEC 61010-1, IEC 61010-2-030 and IEC 61557-1 the
operating instructions shall include the following information:
– for measuring equipment with service-socket; if applicable, the information that the
installation of the distribution system shall take over the protection against overcurrent,
short-circuits and electric shock according to 4.3.3;
– operating uncertainty, intrinsic uncertainty, influencing quantities and their effects;
– for testing equipment capable of testing dielectric strength according to 4.2.6, additional
warnings to mark and to separate the surroundings of machinery during the test;
– recommendations about intervals for recalibration.
6 Tests
6.1 General
Safety of measuring equipment shall be tested according to IEC 61010-1, IEC 61010-2-030,
IEC 61010-2-032 and IEC 61010-031, if not otherwise stated.
All tests shall be carried out under reference conditions, if not otherwise stated.
6.2 Operating uncertainty
The percentage operating uncertainty shall be determined according to 4.1 of
IEC 61557-1:2007 taking into account applicable influencing quantities according to Table 2.
The intrinsic uncertainty A shall be determined for each measured parameter under the
following reference conditions (routine test):
– nominal system voltage;
– nominal system frequency;
– reference temperature (23 °C ± 2 °C);
– reference position according manufacturers specification;
– nominal supply voltage or battery voltage;
– no low-frequency external magnetic field;
– difference between phase angle of loading equipment and loop impedance under test ≤ 5°
in case of measurement of loop impedance.
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.

61557-14 © IEC:2013 – 13 –
Table 2 – Determination of operating uncertainty
Intrinsic Reference conditions or specified Designation Requirements or Type
uncertainty or operating range code test according to of
Influencing test
quantity
Intrinsic Reference conditions A 6.2 R
uncertainty IEC 6155713:2011,
4.4 and 6.2
Position E 6.3.1 T
Reference position ± 90 °
IEC 61557-13
Reference position ± 30 °, for any position
within the clamp jaws, if no fixing device is
specified
Mains supply 85 % and 110 % E 6.3.2 T
voltage
As specified
Battery voltage
Temperature E 6.3.3 T
0 °C to +35 °C or extended range specified by
the manufacturer
Angle of system 18 ° E 6.3.4, T

6.1
impedance IEC 61557-3:2007
4.1, 6.1
Angle of system 30 ° E 6.3.4, T
6.2
impedance IEC 61557-3:2007
4.1, 6.1
System Nominal frequency ± 1 % E 6.3.5, T
frequency IEC 61557-3:2007
4.1, 6.1
System voltage 85% and 110 % E 6.3.6,

IEC 61557-3
4.1, 6.1
Distorted 5 % of 3. harmonic at 0 ° E 6.3.7, T
waveform 6 % of 5. harmonic at 180 ° IEC 61557-3:2007,
5 % of 7. harmonic at 0 °  4.1, 6.1
d.c.-quantity 0,5 % of system voltage in both polarities E 6.3.8, T

IEC 61557-3:2007
4.1, 6.1
External low Operating class 1 at 100 A/m E 6.3.9, T
frequency                 30 A/m IEC 61557-13:2011
magnetic field                 10 A/m 4.2
15 Hz.400 Hz Operating class 2 at 30 A/m
according to                 10 A/m
IEC 61000-4-8 Operating class 3 at 10 A/m
Load current Nominal range of load current according to E 6.3.10, T
manufacturer’s specification IEC 61557-13:2011
4.1
Touch current Touch current through circuit according to E 6.3.11, T
caused by Figure A.1 of IEC 61010-1:2010 between IEC 61557-13:2011
common mode hand-held parts (covered with metal foil) and 4.5
voltage earth. Conductor held at maximum common
mode voltage and highest rated mains
frequency.
Frequency Rated frequency range according to E 6.3.12, T
manufacturer’s specification IEC 61557-13:2011
4.1
Repeatability Difference between the highest and lowest E 6.3.13, R
value of the intrinsic uncertainty IEC 61557-13:2011
4.5
– 14 – 61557-14 © IEC:2013
Intrinsic Reference conditions or specified Designation Requirements or Type
uncertainty or operating range code test according to of
Influencing test
quantity
Percentage T
operating
uncertainty
Key
R Routine test
T Type test
A Intrinsic uncertainty
E Further variations, if applicable.
n
6.3 Variations
6.3.1 Variation due to position
If applicable, the variation E due to position shall be determined in positions +90° and –90°
from the reference position for all measuring functions (routine test).
6.3.2 Variation due to supply voltage
The variation E due to supply voltage shall be determined for all measuring functions under
the following conditions (routine test):
– for measuring equipment with mains supply at –15 % and +10 % of the nominal voltage;
– for measuring equipment with battery supply at the limits defined under IEC 61557-1:2007,
4.3.
6.3.3 Variation due to temperature
due to temperature shall be determined for all measuring functions under the
The variation E
following conditions:
– at 0 °C and +35 °C after the equipment will have reached steady state conditions (type
test).
6.3.4 Variation due to phase angle of loop impedance
The variation E or E due to the phase angle of loop impedance shall be determined at
6.1 6.2
± 18 ° or, if applicable, at ± 30 ° for the measurement of loop impedance (type test).
6.3.5 Variation due to system frequency
The variation E due to system frequency for measurement of loop impedance shall be
determined at 99 % and 101 % of the system frequency (type test).
6.3.6 Variation due to system voltage
The variation E due to system voltage E for measurement of the loop impedance shall be
8 8
determined at 85 % and 110 % of the system voltage (type test).
6.3.7 Variation due to harmonics
The variation E due to harmonics shall be determined for the measurement of loop
impedance and leakage current at:

61557-14 © IEC:2013 – 15 –
– 5 % of 3. harmonic / 0° phase shift
– 6 % of 5. harmonic / 180° phase shift
– 5 % of 7. harmonic / 0° phase shift
Percentage of harmonics shall be determined from the nominal wave (type test).
6.3.8 Variation due to d.c. quantities
The variation E due to d.c. quantities for the measurement of loop impedance shall be
determined at 0,5 % of the nominal system voltage in both polarities (type test).
6.3.9 Variations due to external low frequency magnetic field (if applicable)
The variation E due to external low frequency magnetic field shall be determined according

to IEC 61557-13 (type test).
6.3.10 Variations due to load current (if applicable)
The variation E due to load current of a leakage current clamp shall be determined

according to IEC 61557-13 (type test).
6.3.11 Variations due to touch current caused by common mode voltage (if applicable)
The variation E due to touch current caused by common mode voltage shall be determined
according to IEC 61557-13 (type test).
6.3.12 Variations due to frequency of measured current (if applicable)
The variation E due to frequency of the measured current shall be determined according to
IEC 61557-13 (type test).
6.3.13 Variations due to repeated clamping (if applicable)
The variation E due to repeated clamping shall be determined according to IEC 61557-13
(routine test).
6.4 Tests of measuring equipment according to measuring functions
Testing of measuring equipment according to the measuring functions shall be performed
according to Table 3.
– 16 – 61557-14 © IEC:2013
Table 3 – Compliance tests of measuring equipment according to measuring function
Measuring function Compliance verification Requirements Type test Routine
according to test
Test detail
subclause
Resistance of electric 4.2.2 X
bonding
Loop impedance 4.2.3 X X
Insulation resistance 4.2.4 X X
Testing effectiveness of 4.2.5 X X
protective measure with RCD
Dielectric strength Compliance with requirements shall 4.2.6
be verified by:
X
• Uncertainty of setting of testing
voltage
• Other requirements X
Test duration 4.2.6
Residual voltage If applicable 4.2.7 X X
Leakage current If applicable 4.2.8 X X

6.5 Test of construction requirements of test equipment
Testing of construction requirements of test equipment shall be performed according to
Table 4.
Table 4 – Test of construction requirements of test equipment
Test of Compliance with requirements Type test Routine test
according to subclause
Overload capability of combined equipment 4.3.1 X
Terminals 4.3.2 X
Service socket 4.3.3 X
Degree of protection 4.3.4 X
Protection class 4.3.5 X
Protective bonding 4.3.6 X
Battery control- 4.3.7 X
Mechanical requirements 4.3.8 X
Pollution degree 4.3.9 X
Overvoltage category and measurement 4.3.10 X
category
Electromagnetic compatibility EMC) 4.3.11 X
Test accessories 4.3.12 X
Markings 5.1 X
Operating instructions 5.2 X
61557-14 © IEC:2013 – 17 –
Bibliography
IEC 61557-5, 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
IEC 61557-7, 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 7: Phase sequence
IEC 61557-8, 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 8: Insulation monitoring devices for IT systems
IEC 61557-9, 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 9: Equipment for insulation fault location in IT systems
IEC 61557-11, 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
IEC 61557-12, 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 12: Performance measuring and monitoring devices (PMD)

_____________
– 18 – 61557-14 © CEI:2013
SOMMAIRE
AVANT-PROPOS . 20
INTRODUCTION . 22
1 Domaine d'application . 23
2 Références normatives . 23
3 Termes et définitions . 24
4 Exigences. 24
4.1 Exigences générales . 24
4.2 Grandeurs mesurées . 24
4.2.1 Généralités . 24
4.2.2 Mesure de la résistance de la liaison de protection . 25
4.2.3 Mesure de la résistance de boucle. 25
4.2.4 Mesure de la résistance d'isolement . 25
4.2.5 Essai de l'efficacité des mesures de protection avec les dispositifs à
courant résiduel (DCR) . 25
4.2.6 Essai de rigidité diélectrique . 25
4.2.7 Mesure de la tension résiduelle . 26
4.2.8 Mesure du courant de fuite . 26
4.3 Exigences de construction pour les dispositifs d’essai . 26
4.3.1 Capacité de surcharge . 26
4.3.2 Bornes . 26
4.3.3 Ports pour maintenance . 26
4.3.4 Degré de protection . 27
4.3.5 Classe de protection . 27
4.3.6 Résistance de la liaison de protection . 27
4.3.7 Contrôle de la pile . 27
4.3.8 Exigences mécaniques . 27
4.3.9 Degré de pollution . 27
4.3.10 Catégories de surtension et de mesure . 27
4.3.11 Compatibilité électromagnétique (CEM) . 27
4.3.12 Accessoires .
...