prEN 61010-2-030

SLOVENSKI OSIST prEN 61010-2-030:2004

PREDSTANDARD
oktober 2004
Varnostne zahteve za električno opremo za meritve, nadzorovanje in
laboratorijsko uporabo – 2-030. del: Posebne zahteve za preskušanje in
merjenje tokokrogov
Safety requirements for electrical equipment for measurement, control and
laboratory use – Part 2-030: Special requirements for testing and measuring circuits
ICS 19.080; 71.040.10 Referenčna številka
OSIST prEN 61010-2-030:2004(en)
©  Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno

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66/343/CDV
COMMITTEE DRAFT FOR VOTE (CDV)

IEC/TC or SC: Project number
IEC 61010-2-030 Ed.1.0
66
Title of TC/SC: Date of circulation Closing date for
2004-07-23 comments
Safety of measuring, control and laboratory
2005-01-07
equipment
Also of interest to the following committees Supersedes document
   66/334/CD , 66/338/CC
Functions concerned:
   Safety   EMC   Environment   Quality assurance
Secretary:
THIS DOCUMENT IS STILL UNDER STUDY AND SUBJECT TO
CHANGE. IT SHOULD NOT BE USED FOR REFERENCE
Nick Bradfield
PURPOSES.
RECIPIENTS OF THIS DOCUMENT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY RELEVANT
PATENT RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION.

Title:
IEC 61010-2-030 Ed. 1.0 Safety requirements for electrical equipment for measurement, control, and
laboratory use - Part 30 Special requirements for testing and measuring circuits
(Titre) :
CEI 61010-2-030 Ed. 1.0 Règles de sécurité pour appareils électriques de mesurage, de régulation et de
laboratoire - Partie 2 - 030 : Prescriptions particulières pour les circuits de test et de mesure

Introduction
This document represents the proposed draft of the First Edition of IEC 61010-2-030, including the
unique requirements for test and measurement circuits that have been removed from the Part 1
document.
It is necessary to circulate the draft of IEC 61010-1 with the matching companion draft of IEC
61010-2-030. All votes will need to take both drafts into account. All comments will need to be
considered by both WG1 and WG2 to determine which document (or both documents) may be
affected by the comment.
Introduction
Ce document constitue le projet de première édition de la CEI 61010-2-030, comprenant les
exigences uniques pour les circuits de test et de mesure qui ont été retirées de la seconde édition
de la CEI 61010-1.
Le projet de troisième édition de la CEI 61010-1 doit être diffusé obligatoirement avec le projet
associé correspondant de la CEI 61010-2-030. Tous les votes devront tenir compte des deux
projets. Tous les commentaires devront être examinés à la fois par les WG1 et WG2 pour
déterminer quel document (ou les deux documents) peut être affecté par le commentaire.
ATTENTION ATTENTION

CDV soumis en parallèle au vote (CEI) Parallel IEC CDV/CENELEC Enquiry
et à l’enquête (CENELEC)


Copyright © 2004 International Electrotechnical Commission, IEC. All rights reserved. It is permitted to
download this electronic file, to make a copy and to print out the content for the sole purpose of preparing
National Committee positions. You may not copy or "mirror" the file or printed version of the document, or
any part of it, for any other purpose without permission in writing from IEC.

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IEC 61010-2-030 Safety requirements for electrical equipment for measurement,
control, and laboratory use – Part 30 Special 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 also measurement circuits which are part of test and measurement equipment,
laboratory equipment, or process control equipment. The presence of these circuits in
equipment may require additional protective means between the circuit and an OPERATOR.
NOTE 1 –These testing and measurement circuits may, for example:
- measure voltages in circuits of other equipment,
- measure temperature of a separate device measured via a thermocouple,
- measure pressure of a separate device measured with a strain gauge,
- inject a voltage onto a circuit to analyze a new design.
This part of IEC 61010 applies to testing and measuring circuits which have a RATING for
connection to voltages exceeding 33 V r.m.s., 46.7 V peak, or 70 V d.c., or which have a
RATING for connection to circuits which are not limited energy circuits (see 9.3 of Part 1).
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 AA 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 new subclauses:
3.5.101
MEASUREMENT CATEGORY
Classification of testing and measuring circuits according to the type of MAINS CIRCUITS and
other circuits to which they are intended to be connected. They take into account
standardized limits for transient overvoltages and potential energy levels, the line voltage to
earth, the typical building installation impedances, and the location in the building installation
at which the test or measurement is to be made.

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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
5.1.5.2 TERMINALS
Add a new item f), as follows:
f) If equipment is intended to make measurements on a MAINS supply and to be powered
from the same source, any TERMINALS to be connected to the MAINS supply shall be
marked with the MEASUREMENT CATEGORY.
Add a new subclause:
5.1.5.101 Measuring circuit TERMINALS
Measuring circuit TERMINALS shall be marked with the RATED voltage to earth, and as required
by a), b), or c).
NOTE – 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 will have a RATED voltage
to earth.
a) Measuring circuit TERMINALS that have a RATING for connection to voltages above 50 V a.c.
or 120 V d.c., and for measurements within MEASUREMENT CATEGORY I shall be marked
with the RATED voltage or the RATED current as applicable and with symbol 14 of table 1
(see also 5.4.1 aa) and bb)).
b) Measuring circuit TERMINALS for measurements within MEASUREMENT CATEGORIES II, III and
IV shall be marked with the RATED voltage or the RATED current as applicable and the
relevant MEASUREMENT CATEGORY. The MEASUREMENT CATEGORY markings shall be:
“CAT II”, “CAT III” or “CAT IV” as applicable.
c) For measuring circuit TERMINALS that do not have a RATING for connection to voltages
above 50 V a.c. or 120 V d.c., the RATED voltage or the RATED current, as applicable, shall
be marked. Alternative markings are acceptable.
NOTE – Examples of acceptable indications that the inputs in all cases are intended to be less than 50 V a.c.
or 120 V d.c. to earth 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;
- the marked intended function of the instrument (e.g. millivoltmeter or milliammeter).
Measuring circuit TERMINALS that are permanently connected and not ACCESSIBLE need not be
marked (see 5.4.3 aa)). The MEASUREMENT CATEGORY and the RATED maximum WORKING
VOLTAGE or RATED maximum current for such TERMINALS shall be stated in the equipment
installation instructions (see 5.4.3).
Circuit TERMINALS (connectors) which are dedicated only for connection to specific TERMINALS
of other equipment need not be marked, provided that there is a means for identifying these
TERMINALS.
Markings shall be placed adjacent to the TERMINALS. However, if there is insufficient space (as
in multi-input equipment), the marking may be on the RATING plate or scale plate, or the
TERMINAL may be marked with symbol 14 of Table 1.

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Conformity is checked by inspection.
5.4.1 General
Add new items to the list:
aa) information about the relevant MEASUREMENT CATEGORY if the measuring circuit has a
RATING for MEASUREMENT CATEGORY II, III, or IV. (See 5.1.5.101).
bb) for measuring circuits that do not have a RATING for MEASUREMENT CATEGORY II, III, or IV, a
warning shall be given not to use the equipment for measurements within other
MEASUREMENT CATEGORIES, and a detailed RATING, including the RATED transient
overvoltages, shall be given in the documentation.
5.4.3 Equipment installation
Add a new item to the list:
aa) for measuring circuit TERMINALS for voltage or current that are permanently connected and
not ACCESSIBLE, information regarding the MEASUREMENT CATEGORY, RATED maximum
WORKING VOLTAGE or RATED maximum current (see 5.1.5.101).
6 Protection against electric shock
This clause of Part 1 is applicable except as follows:
6.1.2 Exceptions
Add a new item to the list:
aa) locking and screw-held type measuring TERMINALS, including TERMINALS which do not
require the use of a TOOL.
6.5.2 PROTECTIVE BONDING
Replace the conformity statement with the following:
Conformity is checked as specified in 6.5.2.1 to 6.5.2.4 and 6.5.2.101.
6.5.2.2 PROTECTIVE CONDUCTOR TERMINAL
Replace h) ii) with the following h) ii):
h) ii) The PROTECTIVE BONDING shall not be interrupted by any switching or interrupting
device. Devices used for indirect bonding in test and measurement equipment (see
6.5.1.101) 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 values 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

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61010-2-030 Ed.1/CDV © IEC –  5  – 66/343/CDV
voltage between the ACCESSIBLE conductive parts and the PROTECTIVE CONDUCTOR
TERMINAL shall not exceed the relevant values 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 values of 6.3.2 a).
Conformity is checked by applying the relevant voltage 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.
6.6.2 TERMINALS for external circuits
Add a new third paragraph:
Unmated measuring TERMINALS which can become HAZARDOUS LIVE when the maximum RATED
voltage is applied shall not be ACCESSIBLE.
6.7 Insulation requirements
6.7.2 CLEARANCES
Add a new subclause:
6.7.2.101 CLEARANCES for measuring circuits
Measuring circuits are subjected to working voltages and transient stresses from the circuit to
which they are connected during measurement or test. When the measuring circuit is used to
measure MAINS, the transient stresses can be estimated by the location within the installation
at which the measurement is performed. When the measuring circuit is used to measure any
other electrical signal, the transient stresses must be considered by the user to assure that
they do not exceed the capabilities of the measuring equipment.
NOTE – When the measuring circuit is used to connect to MAINS, there is a risk of arc flash explosion.
MEASUREMENT CATEGORIES define the amount of energy available, which may contribute to arc flash. In conditions
where arc flash exists, additional precautions identified by the manufacturer to reduce the HAZARD related to shock
and burn from arc flash are required within the user documentation. Also see Annex AA.
For equipment intended to be powered from the circuit being measured, CLEARANCES of the
MAINS CIRCUIT shall be designed according to the requirements of the RATED MEASUREMENT
CATEGORY, but overvoltage limiting devices may be used to reduce the transients to a level
consistent with a lower MEASUREMENT CATEGORY. (See 14.9.) See 5.1.5.2 and 5.1.5.101 for
additional markings requirements.
a) CLEARANCES for MEASUREMENT CATEGORY I shall be calculated according to 6.7.2.4.
b) CLEARANCES for MEASUREMENT CATEGORY II, III and IV are specified in Table 101.

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Table 101 – CLEARANCES for MEASUREMENT CATEGORIES II, III and IV
Nominal a.c. BASIC INSULATION or SUPPLEMENTARY
or d.c. line- INSULATION
to-neutral
voltage of
MAINS being
measured
MEASUREMENT CATEGORY
II III IV
V mm mm mm
0,04 0,1 0,5
≤50
0,1 0,5 1,5
>50 ≤100
>100 ≤150 0,5 1,5 3,0
1,5 3,0 5,5
>150 ≤300
3,0 5,5 8
>300 ≤600
5,5 8 14
>600 ≤1 000
NOTE – The values for DOUBLE INSULATION or REINFORCED INSULATION
shall be twice the values for BASIC INSULATION.

c) CLEARANCES for homogenous construction are specified in 6.7.2.5 of Part 1.
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 instrument is set.
NOTE – Examples of HAZARDOUS 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, in case of doubt, by provoking an over-range value.
7 Protection against mechanical HAZARDS
This clause of Part 1 is applicable.
8 Mechanical resistance to shock and impact
This clause of Part 1 is applicable.

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