IEC 61010-2-030:2010

Safety requirements for electrical equipment for measurement, control, and laboratory use - Part 2-030: Particular requirements for testing and measuring circuits

IEC 61010-2-030:2010 specifies safety requirements for testing and measuring circuits which are connected for test or measurement purposes to devices or circuits outside the measurement equipment itself. These include measurement circuits which are part of electrical test and measurement equipment, laboratory equipment, or process control equipment. The existence of these circuits in equipment requires additional protective means between the circuit and an OPERATOR. This Part 2-030 is to be used in conjunction with the latest edition of IEC 61010-1. It was established on the basis of the third edition (2010) of IEC 61010-1. Consideration may be given to future editions of, or amendments to, IEC 61010-1.
This publication is to be read in conjunction with IEC 61010-1:2010. The contents of the corrigendum of May 2011 have been included in this copy.

Règles de sécurité pour appareils électriques de mesurage, de régulation et de laboratoire - Partie 2-030: Exigences particulières pour les circuits de test et de mesure

La CEI 61010-2-030:2010 définit les exigences de sécurité pour les circuits de test et de mesure qui sont reliés à des fins d'essai ou de mesure à des dispositifs ou à des circuits externes à l'appareil de mesure même. Ceux-ci comprennent les circuits de mesure qui font partie d'appareils électriques d'essai et de mesure, d'appareils de laboratoire ou d'appareils de contrôle de processus. L'existence de ces circuits dans l'appareil exige des moyens de protection additionnels entre le circuit et un OPERATEUR. La présente Partie 2-030 doit être utilisée conjointement avec la dernière édition de la CEI 61010-1. Elle a été établie sur la base de la troisième édition (2010) de la CEI 61010-1. Les éditions ou amendements futurs de la CEI 61010-1 pourront être pris en considération.
Cette publication doit être lue conjointement avec la CEI 61010-1:2010. Le contenu du corrigendum de mai 2011 a été pris en considération dans cet exemplaire.

General Information

• Status: Published
• Publication Date: 09-Jun-2010
• ICS: 19.080 - Electrical and electronic testing
• ICS: 71.040.10 - Chemical laboratories. Laboratory equipment
• Technical Committee: TC 66 - Safety of measuring, control and laboratory equipment
• Drafting Committee: WG 2 - TC 66/WG 2
• Current Stage: DELPUB - Deleted Publication
• Start Date: 12-Jan-2017
• Completion Date: 26-Oct-2025

Relations

• Corrected By: IEC 61010-2-030:2010/COR1:2011 - Corrigendum 1 - Safety requirements for electrical equipment for measurement, control, and laboratory use - Part 2-030: Particular requirements for testing and measuring circuits
• Effective Date: 05-Sep-2023
• Revised: IEC 61010-2-030:2017 - Safety requirements for electrical equipment for measurement, control, and laboratory use - Part 2-030: Particular requirements for equipment having testing or measuring circuits
• Effective Date: 05-Sep-2023

Overview

IEC 61010-2-030:2010 is an internationally recognized standard published by the International Electrotechnical Commission (IEC) that specifies safety requirements for testing and measuring circuits used in electrical equipment for measurement, control, and laboratory applications. This part (2-030) provides particular requirements supplementing the general safety specifications outlined in IEC 61010-1, focusing on the protective measures needed for circuits connected externally during testing or measurement operations.

This standard addresses safety concerns for electrical test, measurement, laboratory, and process control equipment by ensuring effective protection for operators when interacting with measuring circuits that may be connected to hazardous voltages or complex electrical networks. The requirements include specifications for clearances, insulation, transient overvoltage protection, and design features that prevent electric shock, fires, and mechanical hazards.

The standard was designed based on the third edition of IEC 61010-1 (2010) and includes corrections and clarifications made as of May 2011. It is essential for manufacturers, designers, and users of electrical test equipment to comply with this standard to ensure safety and product reliability.

Key Topics

• Scope and Object
  Defines the equipment covered, including instruments that measure or inject signals to external devices or circuits for testing or calibration purposes. It highlights the necessity for additional protective measures between test circuits and users.

• Testing and Measurement Safety Requirements
  Covers detailed requirements for protection against electric shock, mechanical hazards, and fire spread, emphasizing insulation, creepage and clearance distances, and protection against transient overvoltages.

• Measurement Categories
  Classifies testing and measuring circuits based on their intended application environment and voltage exposure to assist in appropriate safety design measures. These categories help define insulation and clearance requirements.

• Protective Measures
  Requirements include interlocks, protective earth disconnections, and precautions against foreseeable misuse like arc flash hazards and the disconnection of safety grounds.

• Documentation and Marking
  Specifies necessary labeling and user documentation to inform operators about safety aspects, correct usage, and boundary conditions of the measuring circuits.

• Annexes and Supplementary Details
  Contains normative annexes focusing on insulation requirements, measurement category characteristics, and hazard considerations when measurements are performed in different environments.

Applications

IEC 61010-2-030:2010 is vital for various industries and sectors where electrical testing and measurement are conducted, including:

• Electrical and Electronics Manufacturing
  Design and safety assessment of multimeters, oscilloscopes, and power analyzers that measure voltage, current, or resistance in electrical circuits.

• Laboratory Equipment Safety
  Ensuring safe operation of laboratory instruments involved in research, quality assurance, and development testing that interact with external electrical signals.

• Process Control Systems
  Safety specification for equipment used in industrial automation and control systems that require precise electrical measurements to maintain operational safety.

• Maintenance and Field Testing
  Guiding field technicians and maintenance personnel using portable test equipment to safely conduct measurements on electrical installations and machinery.

Related Standards

• IEC 61010-1 – General safety requirements for electrical equipment for measurement, control, and laboratory use. IEC 61010-2-030 supplements and modifies clauses from this foundational part.

• IEC 60529 – Degrees of protection provided by enclosures (IP Code), relevant for testing equipment enclosure safety.

• IEC 61140 – Protection against electric shock – common aspects for electrical equipment, supporting overarching safety concepts.

• ISO/IEC Directives – Standardization guidelines followed by IEC for drafting and updating the publication.

Understanding and applying IEC 61010-2-030:2010 ensures that electrical testing and measuring equipment operate safely under various conditions while protecting users against electrical and mechanical hazards. Compliance with this standard contributes to product safety certification and risk reduction in electrical measurement environments.

Standards Content (Sample)

IEC 61010-2-030 ®
Edition 1.0 2010-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Safety requirements for electrical equipment for measurement, control, and
laboratory use –
Part 2-030: Particular requirements for testing and measuring circuits

Règles de sécurité pour appareils électriques de mesurage, de régulation et
de laboratoire –
Partie 2-030: Exigences particulières pour les circuits de test et de mesure

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IEC 61010-2-030 ®
Edition 1.0 2010-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Safety requirements for electrical equipment for measurement, control, and
laboratory use –
Part 2-030: Particular requirements for testing and measuring circuits

Règles de sécurité pour appareils électriques de mesurage, de régulation et
de laboratoire –
Partie 2-030: Exigences particulières pour les circuits de test et de mesure

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
V
CODE PRIX
ICS 19.080; 71.040.10 ISBN 978-2-88910-988-3
– 2 – 61010-2-030 © IEC:2010
CONTENTS
FOREWORD.4
1 Scope and object .7
2 Normative references.7
3 Terms and definitions .7
4 Tests .8
5 Marking and documentation .8
6 Protection against electric shock.9
7 Protection against mechanical HAZARDS .12
8 Resistance to mechanical stresses .12
9 Protection against the spread of fire .12
10 Equipment temperature limits and resistance to heat .12
11 Protection against HAZARDS from fluids .12
12 Protection against radiation, including laser sources, and against sonic and
ultrasonic pressure .12
13 Protection against liberated gases and substances, explosion and implosion.12
14 Components and subassemblies.12
15 Protection by interlocks .13
16 HAZARDS resulting from application .13
17 RISK assessment.13
101 Measuring circuits.13
Annexes .18
Annex K (normative) Insulation requirements not covered by 6.7 .18
Annex L (informative) Index of defined terms .24
Annex AA (normative) Measurement categories.25
Annex BB (informative) Hazards pertaining to measurements performed in certain
environments .28
Bibliography.31

Figure AA.1 – Example to identify the locations of measuring circuits .26

Table 101 – CLEARANCES and CREEPAGE DISTANCES for measuring circuit TERMINALS
with HAZARDOUS LIVE conductive parts .11
Table 102 – Impulse withstand voltages.13
Table K.101 – CLEARANCES for MEASUREMENT CATEGORIES II, III and IV .19
Table K.102 – Test voltages for testing electric strength of solid insulation in
measuring circuits of MEASUREMENT CATEGORY II .20
Table K.103 – Test voltages for solid insulation in measuring circuits of
MEASUREMENT CATEGORY III .20
Table K.104 – Test voltages for testing electric strength of solid insulation in
measuring circuits of MEASUREMENT CATEGORY IV .20
Table K.105 – Test voltages for testing long term stress of solid insulation in
measuring circuits.21
Table K.106 – Maximum TRANSIENT OVERVOLTAGES .23

61010-2-030 © IEC:2010 – 3 –
Table AA.1 – Characteristics of MEASUREMENT CATEGORIES .27

– 4 – 61010-2-030 © IEC:2010
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
SAFETY REQUIREMENTS FOR ELECTRICAL EQUIPMENT
FOR MEASUREMENT, CONTROL, AND LABORATORY USE –

Part 2-030: Particular requirements for testing and measuring circuits

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization
comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to
promote international co-operation on all questions concerning standardization in the electrical and
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Technical Specifications, Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter
referred to as “IEC Publication(s)”). Their preparation is entrusted to technical committees; any IEC National
Committee interested in the subject dealt with may participate in this preparatory work. International,
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IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with
conditions determined by agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an
international consensus of opinion on the relevant subjects since each technical committee has
representation from all interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly
indicated in the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts
and members of its technical committees and IEC National Committees for any personal injury, property
damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal
fees) and expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other
IEC Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications
is indispensable for the correct application of this publication.
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 61010-2-030 has been prepared by IEC technical committee
66: Safety of measuring, control and laboratory equipment.
The text of this standard is based on the following documents:
FDIS Report on voting
66/417/FDIS 66/427/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.
This Part 2-030 is to be used in conjunction with the latest edition of IEC 61010-1. It was
established on the basis of the third edition (2010) of IEC 61010-1. Consideration may be
given to future editions of, or amendments to, IEC 61010-1.

61010-2-030 © IEC:2010 – 5 –
This Part 2-030 supplements or modifies the corresponding clauses in IEC 61010-1 so as
to convert that publication into the IEC standard: Particular requirements for testing and
measuring circuits.
Where a particular subclause of Part 1 is not mentioned in this part 2, that subclause
applies as far as is reasonable. Where this part states “addition”, “modification”,
“replacement”, or “deletion” the relevant requirement, test specification or note in Part 1
should be adapted accordingly.
In the second edition of IEC 61010-1, the requirements for testing and measuring circuits
were included in Part 1 itself. In the third edition of IEC 61010-1, these requirements have
been removed from Part 1 and have become the basis for the requirements in this Part 2.
In addition to the requirements removed from Part 1, the following major requirements
have been added to this standard. Numerous other changes have also been made.
MEASUREMENT CATEGORY I has changed. In this Part 2, it is termed
• The terminology for
“not rated for measurements within MEASUREMENT CATEGORIES II, III, or IV”.
• CLEARANCES and CREEPAGE DISTANCES have been added for unmated measuring circuit
TERMINALS.
• Requirements have been added for specialized measuring circuit TERMINALS.
• Requirements for TRANSIENT OVERVOLTAGE limiting devices have been revised.
• Requirements have been revised and added pertaining to REASONABLY FORESEEABLE
MISUSE of measuring circuits, including disconnection of the protective earth and usage
of the equipment in a manner that might cause arc flash.
• Insulation requirements for measuring circuits have been primarily located in Annex K.
• Annex AA has been added to describe the characteristics of MEASUREMENT CATEGORIES.
• Annex BB has been added to describe hazards that may be encountered when using
measuring circuits.
In this standard:
a) the following print types are used:
– requirements: in roman type;
– NOTES: in small roman type;
– conformity and test: in italic type;
– terms used throughout this standard which have been defined in Clause 3: SMALL
ROMAN CAPITALS;
b) subclauses, figures, tables and notes which are additional to those in Part 1 are
numbered starting from 101. Additional Annexes are numbered AA and BB.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts of the IEC 61010 series, under the general title Safety requirements for
electrical equipment for measurement, control, and laboratory use, can be found on the
IEC website.
– 6 – 61010-2-030 © IEC:2010
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.
The contents of the corrigendum of May 2011 have been included in this copy.

61010-2-030 © IEC:2010 – 7 –
SAFETY REQUIREMENTS FOR ELECTRICAL EQUIPMENT
FOR MEASUREMENT, CONTROL, AND LABORATORY USE –

Part 2-030: Particular requirements for testing and measuring circuits

1 Scope and object
This clause of Part 1 is applicable except as follows:
1.1.1 Equipment included in scope
Replace the text with the following:
This part of IEC 61010 specifies safety requirements for testing and measuring circuits
which are connected for test or measurement purposes to devices or circuits outside the
measurement equipment itself.
These include measurement circuits which are part of electrical test and measurement
equipment, laboratory equipment, or process control equipment. The existence of these
circuits in equipment requires additional protective means between the circuit and an
OPERATOR.
NOTE 1 These testing and measuring circuits may, for example:
– measure voltages in circuits of other equipment,
– measure temperature of a separate device via a thermocouple,
– measure force on a separate device via a strain gauge,
– inject a voltage onto a circuit to analyze a new design.
NOTE 2 Testing and measuring circuits that are not within the scope of this Part 2 are considered to be
covered by the requirements of Part 1.
NOTE 3 Equipment containing these testing and measuring circuits may be intended for performing tests and
measurements on hazardous conductors, including MAINS conductors and telecommunication network
conductors. See Annex BB for considerations of HAZARDS involved in various tests and measurements.
2 Normative references
This clause of Part 1 is applicable.
3 Terms and definitions
This clause of Part 1 is applicable except as follows:
3.5 Safety terms
Add a new definition:
3.5.101
MEASUREMENT CATEGORY
classification of testing and measuring circuits according to the type of MAINS CIRCUITS to
which they are intended to be connected

– 8 – 61010-2-030 © IEC:2010
NOTE MEASUREMENT CATEGORIES take into account OVERVOLTAGE CATEGORIES, short-circuit current levels, the
location in the building installation at which the test or measurement is to be made, and some forms of energy
limitation or transient protection included in the building installation. See Annex AA for more information.
4 Tests
This clause of Part 1 is applicable.
5 Marking and documentation
This clause of Part 1 is applicable, except as follows:
5.1.5 TERMINALS, connections and operating devices
Add a new subclause:
5.1.5.101 Measuring circuit TERMINALS
5.1.5.101.1 General
Except as permitted in 5.1.5.101.4:
a) the RATED voltage to earth of measuring circuit TERMINALS shall be marked, and
b) the RATED voltage or the RATED current, as applicable, of each pair or set of measuring
circuit TERMINALS that are intended to be used together shall be marked, and
c) the pertinent MEASUREMENT CATEGORY for each pair or set of measuring circuit
TERMINALS or symbol 14 of Table 1 of Part 1 shall be marked as specified in
5.1.5.101.2 and 5.1.5.101.3, if applicable.
NOTE 1 Measuring circuit TERMINALS are usually supplied in pairs or sets. Each pair or set of TERMINALS may
have a RATED voltage or a RATED current, or both, within that set, and each individual TERMINAL may have a
RATED voltage to earth. Some instruments may have a measurement RATED voltage (between TERMINALS)
different from the RATED voltage to earth. Markings should be clear to avoid misunderstanding.
Symbol 14 of Table 1 shall be marked if current measuring TERMINALS are not intended for
connection to current transformers without internal protection (see 101.2).
Markings shall be placed adjacent to the TERMINALS. However, if there is insufficient space
RATING plate or scale plate, or the
(as in multi-input equipment), the marking may be on the
TERMINAL may be marked with symbol 14 of Table 1.
NOTE 2 For any set of measuring circuit TERMINALS, symbol 14 of Table 1 does not need to be marked more
than once, if it is close to the TERMINALS.
Conformity is checked by inspection and, if applicable, as specified in 5.1.5.101.2 and
5.1.5.101.3, taking into account the exceptions in 5.1.5.101.4.
5.1.5.101.2 Measuring circuit TERMINALS RATED for MEASUREMENT CATEGORIES II, III
or IV
The relevant MEASUREMENT CATEGORY shall be marked for measuring circuit TERMINALS
RATED for measurements within MEASUREMENT CATEGORIES II, III or IV. The MEASUREMENT
CATEGORY markings shall be “CAT II”, “CAT III” or “CAT IV” as applicable.
NOTE Marking more than one type of MEASUREMENT CATEGORY and its RATED voltage to earth is permissible
(see also 5.1.5.101.1, Note 1).
Conformity is checked by inspection.

61010-2-030 © IEC:2010 – 9 –
5.1.5.101.3 Measuring circuit TERMINALS RATED for connection to voltages above the
level of 6.3.1
Symbol 14 of Table 1 shall be marked for measuring circuit TERMINALS RATED for
connection to voltages above the levels of 6.3.1, but that are not RATED for measurements
within MEASUREMENT CATEGORIES II, III or IV (see also 5.4.1 bb)).
Conformity is checked by inspection.
5.1.5.101.4 Low voltage, permanently connected, or dedicated measuring circuit
TERMINALS
Measuring circuit TERMINALS do not need to be marked if
a) they are intended to be permanently connected and not ACCESSIBLE (see 5.4.3 aa) and
bb)), or
b) they are dedicated only for connection to specific TERMINALS of other equipment, or;
c) it is obvious from other indications that the RATED voltage is below the levels of 6.3.1.
NOTE Examples of acceptable indications that the inputs are intended to be less than the levels of 6.3.1
include:
– the full scale deflection marking of a single-range indicating voltmeter or ammeter or maximum
marking of a multi-range multimeter;
– the maximum range marking of a voltage selector switch;
– a marked voltage or power rating expressed in dB, mW or W, where the equivalent value, as explained
in the documentation, is below 33 V a.c.
5.4.1 General
Add new items to the list:
aa) information about each relevant MEASUREMENT CATEGORY if the measuring circuit has
a RATING for MEASUREMENT CATEGORY II, III or IV (see 5.1.5.101.2);
bb) for measuring circuits that do not have a RATING for MEASUREMENT CATEGORY II, III or
IV, but could be misused by connection to such circuits, a warning not to use the
equipment for measurements on MAINS CIRCUITS, and a detailed RATING including
TRANSIENT OVERVOLTAGES (see AA.2.4 for more information).
NOTE Some equipment may have multiple MEASUREMENT CATEGORY RATINGS for the same measuring circuit.
For such equipment, the documentation needs to clearly identify the MEASUREMENT CATEGORIES where the
equipment is intended to be used and where it must not be used.
5.4.3 Equipment installation
Add new items to the list:
aa) for permanently connected measuring circuit TERMINALS RATED for MEASUREMENT
CATEGORIES II, III or IV, information regarding the MEASUREMENT CATEGORY, RATED
maximum WORKING VOLTAGE, and RATED maximum current, as applicable (see
5.1.5.101);
bb) for permanently connected measuring circuit TERMINALS that are not RATED for
MEASUREMENT CATEGORIES II, III or IV, information regarding the RATED maximum
WORKING VOLTAGE, RATED maximum current, and RATED maximum TRANSIENT
OVERVOLTAGES as applicable (see 5.1.5.101).
6 Protection against electric shock
This clause of Part 1 is applicable except as follows:

– 10 – 61010-2-030 © IEC:2010
6.1.2 Exceptions
Add a new item to the list:
aa) locking or screw-held type measuring TERMINALS, including TERMINALS which do not
require the use of a TOOL.
6.5.2.1 General
Replace the conformity statement with the following:
Conformity is checked as specified in 6.5.2.2 to 6.5.2.6 and 6.5.2.101.
6.5.2.3 PROTECTIVE CONDUCTOR TERMINAL
Replace h) 2) with the following h) 2):
h) 2) the PROTECTIVE BONDING shall not be interrupted by any switching or interrupting
device. Devices used for indirect bonding in test and measurement circuits (see
6.5.2.101) are permitted to be part of the PROTECTIVE BONDING.
Add a new subclause:
6.5.2.101 Indirect bonding for testing and measuring circuits
Indirect bonding establishes a connection between the PROTECTIVE CONDUCTOR TERMINAL
and ACCESSIBLE conductive parts if these become HAZARDOUS LIVE as a result of a fault.
Devices to establish indirect bonding are:
a) voltage limiting devices which become conductive when the voltage across them
exceeds the relevant levels of 6.3.2 a), with overcurrent protection to prevent
breakdown of the device;
Conformity is checked by connecting the ACCESSIBLE conductive parts to the MAINS
supply TERMINALS while the equipment is connected to the MAINS supply as in NORMAL
USE. The voltage between the ACCESSIBLE conductive parts and the PROTECTIVE
CONDUCTOR TERMINAL shall not exceed the relevant levels of 6.3.2 a) for more than
0,2 s.
b) voltage-sensitive tripping devices which interrupt all poles of the MAINS supply, and
connect the ACCESSIBLE conductive parts to the PROTECTIVE CONDUCTOR TERMINAL
whenever the voltage across them reaches the relevant levels of 6.3.2 a).
Conformity is checked by applying the relevant voltage level of 6.3.2 a) between the
ACCESSIBLE conductive parts and the PROTECTIVE CONDUCTOR TERMINAL. The tripping
action shall take place within 0,2 s.
6.6 Connections to external circuits
Add new subclauses:
6.6.101 Measuring circuit TERMINALS
Conductive parts of each unmated measuring circuit TERMINAL which could become
HAZARDOUS LIVE when the maximum RATED voltage is applied to other measuring circuit
TERMINALS on the equipment shall be separated by at least the CLEARANCE and CREEPAGE
DISTANCE of Table 101 from the closest approach of the test finger touching the external
parts of the TERMINAL in the least favourable position. See Figure 1 of Part 1.

61010-2-030 © IEC:2010 – 11 –
Table 101 – CLEARANCES and CREEPAGE DISTANCES for measuring circuit TERMINALS with
HAZARDOUS LIVE conductive parts
CLEARANCE and
Voltage on conductive parts of TERMINAL
CREEPAGE DISTANCE
V a.c. r.m.s. V d.c. mm
0,8
≥33 ≤ 300 ≥70 ≤ 414
1,0
>300 ≤ 600 >414 ≤ 848
>600 ≤ 1 000 >848 ≤ 1 414 2,6
NOTE Values are determined by calculation for REINFORCED INSULATION. Transients are not taken into
account.
Conformity is checked by inspection and measurement.
6.6.102 Specialized measuring circuit TERMINALS
Components, sensors, and devices intended to be connected to specialized measuring
circuit TERMINALS shall not be both ACCESSIBLE and HAZARDOUS LIVE, in either NORMAL
CONDITION or SINGLE-FAULT CONDITION, even when the maximum RATED voltage is applied to
any other measuring circuit TERMINAL.
NOTE These specialized TERMINALS include, but are not limited to, TERMINALS for semiconductor measuring
functions, capacitance measurements, and thermocouple sockets.
Conformity is checked by inspection and measurement. Components, sensors, and devices
intended to be connected to specialized measuring circuit TERMINALS are connected. The
measurements of 6.3 are made to establish that the levels of 6.3.1 and 6.3.2 are not
exceeded when each of the following voltages is applied to each other measuring circuit
TERMINAL, if applicable:
RATED a.c. voltage at any RATED MAINS frequency;
a) maximum
b) maximum RATED d.c. voltage;
RATED a.c. voltage at the maximum RATED measurement frequency.
c) maximum
6.9 Constructional requirements for protection against electric shock
Add a new subclause:
6.9.101 Over-range indication
If a HAZARD could arise from an OPERATOR'S reliance on the value (for example, voltage)
displayed by the equipment, the display shall give an unambiguous indication whenever
the value is above the maximum positive value or below the minimum negative value of the
range to which the equipment is set.
NOTE Examples of ambiguous indications include the following, unless there is a separate unambiguous
indication of an over-range value:
a) analogue meters with stops at the exact ends of the range;
b) digital meters which show a low value when the true value is above the range maximum (for example
1 001,5 V displayed as 001,5 V);
c) chart recorders which print a trace at the edge of the chart, thus indicating a value at the range
maximum when the true value is higher.
Conformity is checked by inspection and by provoking an over-range value.

– 12 – 61010-2-030 © IEC:2010
7 Protection against mechanical HAZARDS
This clause of Part 1 is applicable.
8 Resistance to mechanical stresses
This clause of Part 1 is applicable.
9 Protection against the spread of fire
This clause of Part 1 is applicable.
10 Equipment temperature limits and resistance to heat
This clause of Part 1 is applicable.
11 Protection against HAZARDS from fluids
This clause of Part 1 is applicable.
12 Protection against radiation, including laser sources, and against sonic
and ultrasonic pressure
This clause of Part 1 is applicable.
13 Protection against liberated gases and substances, explosion and
implosion
This clause of Part 1 is applicable.
14 Components and subassemblies
This clause of Part 1 is applicable, except as follows:
Add a new subclause:
14.101 Circuits or components used as TRANSIENT OVERVOLTAGE limiting devices in
measuring circuits used to measure MAINS
If control of TRANSIENT OVERVOLTAGE is employed in a measuring circuit used to measure
MAINS, any overvoltage limiting component or circuit shall have adequate strength to limit
likely TRANSIENT OVERVOLTAGES.
Conformity is checked by applying 5 positive and 5 negative impulses with the applicable
impulse withstand voltage of Table 102, spaced up to 1 min apart, from a hybrid impulse
generator (see IEC 61180-1). The generator shall produce an open-circuit voltage
μs, a short-circuit current waveform of 8/20 μs, with an output
waveform of 1,2/50
impedance (peak open-circuit voltage divided by peak short-circuit current) of 2 Ω for
MEASUREMENT CATEGORIES III and IV or 12 Ω for MEASUREMENT CATEGORIES II. Resistance
may be added in series if needed to raise the impedance. The test impulse is applied while

61010-2-030 © IEC:2010 – 13 –
the circuit is working under conditions of NORMAL USE, in combination with the MAINS. The
voltage is the maximum RATED line-to-neutral voltage of the MAINS being measured.
The test voltage is applied between each pair of TERMINALS used to measure MAINS where
voltage-limiting devices are present.
No HAZARD shall arise in the event that the component ruptures or overheats during the
test. If a rupture occurs, no part of the component shall bridge safety-relevant insulation. If
the component overheats, it shall not heat other materials to their self-ignition points.
Tripping the circuit breaker of the MAINS installation is an indication of failure.
Table 102 – Impulse withstand voltages
Nominal a.c. or d.c.
Impulse withstand voltage
line-to-neutral
V
voltage of MAINS
being measured
MEASUREMENT MEASUREMENT MEASUREMENT
V
CATEGORY II CATEGORY III CATEGORY IV
≤50 500 800 1 500
>50 ≤ 100 800 1 500 2 500
1 500 2 500 4 000
>100 ≤ 150
2 500 4 000 6 000
>150 ≤ 300
>300 ≤ 600 4 000 6 000 8 000
6 000 8 000 12 000
>600 ≤ 1 000
15 Protection by interlocks
This clause of Part 1 is applicable.
16 HAZARDS resulting from application
This clause of Part 1 is applicable.
17 RISK assessment
This clause of Part 1 is applicable.
Add a new clause:
101 Measuring circuits
101.1 General
The equipment shall provide protection against HAZARDS resulting from NORMAL USE and
REASONABLY FORESEEABLE MISUSE of measuring circuits, as specified below.
a) If a HAZARD could result, a current measuring circuit shall not interrupt the circuit being
measured during range changing, or during the use of current transformers without
internal protection (see 101.2).

– 14 – 61010-2-030 © IEC:2010
b) An electrical quantity that is within specification for any TERMINAL shall not cause a
HAZARD when it is applied to that TERMINAL or any other compatible TERMINAL, with the
range and function settings set in any possible manner (see 101.3).
c) Any interconnection between the equipment and other devices or accessories shall not
cause a HAZARD even if the documentation or markings prohibit the interconnection
while the equipment is used for measurement purposes (see 6.6).
d) For measuring circuits that include one or more FUNCTIONAL EARTH TERMINALS, a RISK
assessment (see Clauses 16 and 17) shall address the HAZARDS that may result if the
equipment is operated with a disconnected PROTECTIVE CONDUCTOR TERMINAL and if the
operator unintentionally connects a FUNCTIONAL EARTH TERMINAL to any RATED voltage
for any other TERMINAL.
NOTE Oscilloscopes and spectrum analyzers are examples of equipment that often include FUNCTIONAL
EARTH TERMINALS in the measuring circuit. In many cases, the OPERATOR will disconnect the PROTECTIVE
CONDUCTOR TERMINAL so that the FUNCTIONAL EARTH TERMINAL can float above earth potential. This allows
the OPERATOR to make a floating measurement, but introduces a HAZARD. If the OPERATOR should
inadvertently connect the FUNCTIONAL EARTH TERMINAL to a HAZARDOUS LIVE voltage, then the chassis of the
measuring equipment may also be connected to the HAZARDOUS LIVE voltage, and the OPERATOR or a
bystander could receive an electric shock from the chassis.
e) Other HAZARDS that could result from REASONABLY FORESEEABLE MISUSE shall be
addressed by RISK assessment (see Clauses 16 and 17).
Conformity is checked as specified in 101.2, 101.3, 6.6, Clause 16 and Clause 17 as
applicable.
101.2 Current measuring circuits
Current measuring circuits shall be so designed that, when range changing takes place,
there shall be no interruption which could cause a HAZARD.
Conformity is checked by inspection, and, in case of doubt, by causing the device to switch
the maximum RATED current 6 000 times.
Current measuring circuits intended for connection to current transformers without internal
protection shall be adequately protected to prevent a HAZARD arising from interruption of
these circuits during operation.
Conformity is checked by inspection, by overload tests at a value of 10 times the maximum
RATED current for 1 s, and by causing the device to switch the maximum RATED current
6 000 times. No interruption which could cause a HAZARD shall occur during the tests.
101.3 Protection against mismatches of inputs and ranges
101.3.1 General
In NORMAL CONDITION and in cases of REASONABLY FORESEEABLE MISUSE, no HAZARD shall
arise when the maximum RATED voltage or current of a measuring TERMINAL is applied to
any other compatible TERMINAL, with any combination of function and range settings.
NOTE 1 Mismatches of inputs and ranges are examples of REASONABLY FORESEEABLE MISUSE, even if the
documentation or markings prohibit such mismatch. A typical example is inadvertent connection of a high
voltage to a measuring input intended for current or resistance. Possible HAZARDS include electric shock, burns,
fire, arcing and explosion.
NOTE 2 TERMINALS that are clearly not of similar types and that will not retain the TERMINALS of the probe or
accessory need not be tested.
61010-2-030 © IEC:2010 – 15 –
The equipment shall provide protection against these HAZARDS. One of these techniques
shall be used.
a) Use of a certified overcurrent protection device to interrupt short-circuit currents before
a HAZARD arises. In this case, the requirements of 101.3.2 apply.
b) Use an uncertified current limitation device, an impedance, or a combination of both to
prevent the HAZARD from arising. In this case, the requirements of 101.3.3 apply.
Conformity is checked by inspection, evaluation of the design of the equipment, and as
specified in 101.3.2 and 101.3.3, as applicable.
101.3.2 Protection by a certified overcurrent protection device
An overcurrent protection device is considered suitable if it is certified by an independent
laboratory to meet all of the following requirements.
a) The a.c. and d.c. RATED voltages of the overcurrent protection device shall be at least
as high as, respectively, the highest a.c. and d.c. RATED voltages of any measuring
TERMINAL on the equipment.
b) The RATED time-current characteristic (speed) of the overcurrent protection device shall
be such that no HAZARD will result from any possible combination of RATED input
voltages, TERMINALS, and range selection.
NOTE In practice, downstream circuit elements such as components and printed wiring board traces
should be selected to be able to withstand the energy that the overcurrent protection device will let
through.
c) The a.c. and d.c. RATED breaking capacities of the overcurrent protection device shall
exceed, respectively, the possible a.c. and d.c. short-circuit currents.
The possible a.c. and d.c. short-circuit currents shall be calculated as the maximum
RATED WORKING VOLTAGES for any TERMINAL divided by the impedance of the
overcurrent-protected measuring circuit, taking the impedance of the test leads
specified in 101.3.4 into account.
The possible a.c. short-circuit current need not exceed the applicable value in Table AA.1.
Additionally, spacings surrounding the overcurrent protection device in the equipment and
following the protection device in the measuring circuit shall be sufficiently large to prevent
arcing after the protection device opens.
Conformity is checked by inspection of the RATINGS of the overcurrent protection device
and by the following test:
If the protection device is a fuse, it is replaced with an open-circuited fuse. If the protection
device is a circuit breaker, it is set to its open position. A voltage of two times the
maximum RATED voltage for any TERMINAL is applied to the TERMINALS of the overcurrent-
protected measuring circuit for 1 min. The source of the test voltage shall be capable of
delivering 500 VA. During and after the test, no damage to the equipment shall occur.
101.3.3 Protection by uncertified current limitation devices or by impedances
Devices used for current limitation shall be capable of safely withstanding, dissipating, or
interrupting the energy that will be applied as a result of short-circuit current in the case of
REASONABLY FORESEEABLE MISUSE.
An impedance used for limitation of current shall be one or more of the following:

– 16 – 61010-2-030 © IEC:2010
a) An appropriate single component which is constructed, selected, and tested so that
safety and reliability for protection against relevant HAZARDS is assured. In particular,
the component shall:
1) be RATED for the maximum voltage that may be present during the REASONABLY
FORESEEABLE MISUSE event;
2) if a resistor, be RATED for twice the power dissipation that may result from the
REASONABLY FORESEEABLE MISUSE event;
3) meet the applicable CLEARANCE requirements of Annex K for REINFORCED INSULATION
between its terminations.
b) A combination of components which shall
1) withstand the maximum voltage that may be present during the REASONABLY
FORESEEABLE MISUSE event,
2) be able to dissipate the power that may result from the REASONABLY FORESEEABLE
MISUSE event,
3) meet the applicable CLEARANCE requirements of Annex K for REINFORCED INSULATION
between the terminations of the combination of components.
Conformity is checked by inspection and the following test, repeated three times on the
same unit of equipment. If the test results in heating of any component, the equipment is
allowed to cool before the test is repeated. If a device used for current limitation is
damaged, it is replaced before the test is repeated.
The possible a.c. and d.c. short-circuit currents are calculated as the maximum RATED
WORKING VOLTAGES for any TERMINAL divided by the impedance of the current-limited
measuring circuit, taking the impedance of the test leads specified in 101.3.4 into account.
The possible a.c. short-circuit current should not exceed the value in Table AA.1.
A voltage equal to the maximum RATED voltage for any TERMINAL is applied between the
TERMINALS of the measuring circuit for 1 min. The source of the test voltage shall be able to
deliver a current of at least the possible a.c. or d.c. short-circuit current as applicable. If
the function or range controls have any effect on the electrical characteristics of the input
circuit, the test is repeated with the function or range controls in every combination of
positions. During and after the test, no HAZARD shall arise, nor shall there be any evidence
of fire, arcing, explosion, or damage to impedance limitation devices or any component
intended to provide protection against electric shock, heat, arc or fire, including the
ENCLOSURE and traces on the printed wiring board. Any damage to a device used for
current limitation shall be ignored if other parts of the equipment were not affected during
the test.
During the test, the voltage output of the source is measured. If the source voltage
decreases by more than 20 % for more than 10 ms, the test is considered inconclusive and
is repeated with a lower impedance source.
NOTE This test can be extremely hazardous. Explosion shields and other provisions should be used to protect
personnel performing the test.
101.3.4 Test leads for the tests of 101.3.2 and 101.3.3
Test leads for the tests of 101.3.2 and 101.3.3 shall meet the following specifications:
a) length = 1 m;
b) cross section of the conductor = 1,5 mm², stranded copper wire;
NOTE 1 A conductor with 16 AWG (American Wire Gauge) cross section is acceptable.
c) equipment connector compatible with the measuring circuit TERMINALS;

61010-2-030 © IEC:2010 – 17 –
d) connection to the test voltage source via bare wire into suitable screw TERMINALS or
thimble connectors (twist-on wire connectors) or equivalent means of providing a low-
impedance connection;
e) arranged as straight as possible.
NOTE 2 Test leads built to these specifications will have a d.c. resistance of about 15 mΩ each, or 30 mΩ per
pair. For the purposes of calculation of possible short-circuit current in 101.3.2 and 101.3.3, the value of 30 mΩ
may be used for these
...