prEN IEC 61010-2-034:2026

SLOVENSKI STANDARD
01-maj-2026
Varnostne zahteve za električno opremo za meritve, nadzor in laboratorijsko
uporabo - 2-034. del: Posebne zahteve za merilno opremo za izolacijsko upornost
in preskusno opremo za električno trdnost
Safety requirements for electrical equipment for measurement, control, and laboratory
use - Part 2-034: Particular requirements for measurement equipment for insulation
resistance and test equipment for electric strength
Sicherheitsbestimmungen für elektrische Mess-, Steuer-, Regel- und Laborgeräte - Teil 2
-034: Besondere Anforderungen für Prüf- und Messgeräte zur
Isolationswiderstandsmessung und Prüfausrüstung für die Spannungsfestigkeit
Exigences de sécurité pour appareils électriques de mesurage, de régulation et de
laboratoire - Partie 2-034: Exigences particulières applicables aux appareils de mesure
de la résistance d'isolement et aux appareils d'essai de rigidité diélectrique
Ta slovenski standard je istoveten z: prEN IEC 61010-2-034:2026
ICS:
19.080 Električno in elektronsko Electrical and electronic
preskušanje testing
71.040.10 Kemijski laboratoriji. Chemical laboratories.
Laboratorijska oprema Laboratory equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

66/875/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 61010-2-034 ED3
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2026-03-13 2026-06-05
SUPERSEDES DOCUMENTS:
66/867/CD, 66/872/CC
IEC TC 66 : SAFETY OF MEASURING, CONTROL AND LABORATORY EQUIPMENT
SECRETARIAT: SECRETARY:
United Kingdom Ms Stephanie Lavy
OF INTEREST TO THE FOLLOWING COMMITTEES: HORIZONTAL FUNCTION(S):
TC 42,TC 85 TC 66 Horizontal Group Safety
ASPECTS CONCERNED:
Saf ety
SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING
Attention IEC-CENELEC parallel voting
The attention of IEC National Committees, members of
CENELEC, is d rawn to the f act that this Co mmittee Draft
for Vote (CDV) is submitted for parallel voting.
The CENELEC memb ers are invited to vo te thro ug h the
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This document is still under study and subject to change. It should not be used for reference purposes.
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which they are aware and to provide supporting documentation.
Recipients of this document are invited to submit, with their comments, notification of any relevant “In Some
Countries” clauses to be included should this proposal proceed. Recipients are reminded that the CDV stage is
the final stage for submitting ISC clauses. (SEE AC/22/2007 OR NEW GUIDANCE DOC).

TITLE:
Safety requirements for electrical equipment for measurement, control, and laboratory use -
Part 2-034: Particular requirements for measurement equipment for insulation resistance and
test equipment for electric strength

PROPOSED STABILITY DATE: 2031
NOTE FROM TC/SC OFFICERS:
Please note: We kindly ask NCs to submit their comments by 2026-05-29, as the WG has a
planned meeting on June 4th and 5th, 2026.

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 f ile or printed version of the document, or any part of it, f or any other purpose without
permission in writing from IEC.

IEC CDV 61010-2-034 © IEC 2026
1 CONTENTS
2 FOREWORD.3
3 INTRODUCTION .6
4 1 Scope and object .7
5 2 Normative references .8
6 3 Terms, definitions and abbreviated terms .8
7 4 Assessment, tests, and environmental conditions . 10
8 5 Marking and documentation. 11
9 6 Protection against electric shock . 14
10 7 Protection against mechanical hazards . 21
11 8 Resistance to mechanical stresses . 21
12 9 Protection against the spread of fire and arc flash . 21
13 10 Equipment temperature limits and resistance to temperature . 30
14 11 Protection against hazards from fluids and solid foreign objects . 30
15 12 Protection against injury from radiation, sonic and ultrasonic pressure. 30
16 13 Protection against hazardous substances, explosion and implosion. 30
17 14 Components and subassemblies . 30
18 15 Interlocks and safety-related controls . 33
19 16 Protection against HARM related to the use of the equipment . 33
20 17 Assessment of RISKS and situations not fully covered by Clauses 6 to 16 . 37
21 Annex D (normative) Parts between which insulation requirements are specified (see
22 6.4, 6.5.3, 6.101.1 and K.3.101) . 38
23 Annex K (normative) Insulation requirements not covered by 6.7. 39
24 K.3Insulation in circuits not addressed in 6.7, Clause K.1 or Clause K.2 . 39
25 K.4 Reduction of TRANSIENT OVERVOLTAGES by the use of overvoltage limiting devices . 45
26 Annex L (informative) Index of defined terms. 53
27 Annex AA (normative) MEASUREMENT CATEGORIES . 54
28 Annex BB (informative) MEASURING CIRCUITS . 57
29 Annex CC (informative) HAZARDS pertaining to measurements performed in certain
30 environments. 59
31 ANNEX DD (informative) 4 mm "banana" TERMINALS . 62
32 Annex EE (informative) Flowchart for insulation according to the type of MEASURING
33 CIRCUIT . 64
34 Annex FF (informative) Determination of CLEARANCES for Table 102 . 67
35 Annex GG (informative) Effects of capacitors and inductors discharge current . 68
36 Bibliography . 72

37 Figure 101 – Test of an insulator . 30
38 Figure 102 – Test circuit for induced voltage and current . 31
39 Figure K.101 – Circuit with protective screen . 45
40 Figure K.102 – Circuit with DOUBLE INSULATION. 45
41 Figure K.103 – Test circuit for evaluation of TRANSIENT OVERVOLTAGE attenuation . 48
42 Figure AA.1 – Example to identify the locations of MEASUREMENT CATEGORIES . 56
43 Figure DD.1 – Recommended dimensions of 4 mm TERMINALS . 64
IEC CDV 61010-2-034 © IEC 2026
44 Figure EE.1 – Requirements for CLEARANCE, CREEPAGE DISTANCE and solid insulation. 67
45 Figure GG.1 – Forms of current for inductor and capacitor discharges . 70
46 Figure GG.2 – Threshold of ventricular fibrillation . 71

47 Table 0.1 – IEC 61010 standards to be applied in case of combined equipment .7
48 Table 101 – Abbreviated terms . 11
49 Table 102 – CLEARANCES for unmated MEASURING CIRCUIT TERMINALS . 18
50 Table 27 – Bridging insulation by IEC 60384-14 subclass Y capacitors. 33
51 Table K.15 – CLEARANCE values for the calculation of K.3.2 . 42
52 Table K.16 – Test voltages based on CLEARANCES . 43
53 Table K.101 – Impulse voltages for circuits connected to MAINS . 47
54 Table K.102 – CLEARANCES for MEASURING CIRCUITS . 49
55 Table K.103 – Impulse test voltages for solid insulation in MEASURING CIRCUITS . 50
56 Table K.104 – AC test voltages for solid insulation in MEASURING CIRCUITS . 51
57 Table K.105 – Minimum values for distance or thickness of solid insulation in
58 . 52
MEASURING CIRCUITS
59 Table AA.1 – Characteristics of MEASUREMENT CATEGORIES . 57
60 Table FF.1 – CLEARANCES values for Table 102 . 68
61 Table GG.1 - Effects of inductor discharge shock . 72
62 Table GG.2 - Effects of capacitor discharge shock . 72

IEC CDV 61010-2-034 © IEC 2026
63 INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
64 SAFETY REQUIREMENTS FOR ELECTRICAL EQUIPMENT
65 FOR MEASUREMENT, CONTROL, AND LABORATORY USE –

66 Part 2-034: Particular requirements for measurement equipment
67 for insulation resistance and test equipment for electric strength

68 FOREWORD
69 1) The Internatio nal Electro technical Co mmission (IEC) is a wo rld wid e o rg anization f or stand ardization co mprising
70 all natio nal electro technical committees (IEC Natio nal Co mmittees). The o b ject of IEC is to p ro mote international
71 co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
72 in ad d ition to o ther activities, IEC p ub lishes International Standards, Technical Specifications, Technical Reports,
73 Publicly Available Specifications (PAS) and Guides (hereafter referred to as "IEC Publication(s)"). Their
74 p rep aratio n is entrusted to technical committees; any IEC Natio nal Co mmittee interested in the sub ject d ealt with
75 may p articipate in this prep aratory wo rk. International, g overnmental and no n-governmental o rganizations liaising
76 with the IEC also p articip ate in this p rep aratio n. IEC co llab orates clo sely with the Internatio nal Org anization for
77 Stand ard izatio n (ISO) in acco rd ance with co nd itio ns d etermined b y ag reement b etween the two o rg anizatio ns.
78 2) The f o rmal d ecisions o r ag reements o f IEC o n technical matters exp ress, as nearly as p o ssible, an international
79 consensus of opinion on the relevant subjects since each technical committee has representation from all
80 interested IEC National Committees.
81 3) IEC Publications have the f orm of recommendations f or international use and are accepted by IEC National
82 Committees in that sense. While all reasonable ef forts are made to ensure that the technical content of IEC
83 Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
84 misinterpretation by any end user.
85 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
86 transp arently to the maximum extent p ossible in their national and reg ional pub lications. Any d iverg ence b etween
87 any IEC Pub lication and the co rrespo nding national o r reg ional p ublication shall b e clearly ind icated in the latter.
88 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
89 assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible f or any
90 services carried out by independent certification bodies.
91 6) All users should ensure that they have the latest edition of this publication.
92 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
93 memb ers o f its technical co mmittees and IEC Natio nal Co mmittees f or any p erso nal injury, p ro p erty d amage or
94 other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
95 expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
96 Publications.
97 8) Attention is drawn to the Normative ref erences cited in this publication. Use of the ref erenced publications is
98 indispensable for the correct application of this publication.
99 9) Attentio n is d rawn to the p ossib ility that some of the elements of this IEC Pub lication may b e the sub ject of p atent
100 rights. IEC shall not be held responsible for identifying any or all such patent rights.
101 IEC 61010-2-034 has been prepared by IEC technical committee 66: Safety of measuring,
102 control and laboratory equipment. It is an International Standard.
103 It has the status of a group safety publication in accordance with IEC Guide 104.
104 This third edition cancels and replaces the second edition published in 2023. This edition
105 constitutes a technical revision.
106 This edition includes the following significant technical changes with respect to the previous
107 edition:
108 a) Introduction has been reorganized;
109 b) IEC 61010-2-130 is used in conjunction with this document for equipment in both scopes;
110 c) impact of amendment 2 to IEC 61010-1:2010+A1:2016 has been taken into consideration:
111 1) Clause 2 and Bibliography have been updated;
IEC CDV 61010-2-034 © IEC 2026
112 2) MAINS definition has been modified;
113 3) in 4.3.2.5, specific requirements for power supply have been deleted since Amendment
114 2 of IEC 61010-1 take them now into account;
115 4) Figure 101 has been replaced by Figure 3;
116 5) modifications of 6.8.3.1 and 6.8.3.2 have been deleted since Amendment 2 of IEC 61010
117 1 take them now into account;
118 6) conformity statements of K.3.2 and K.101.2 have been modified;
119 7) a few conformity statements for constructional requirements of solid insulation have
120 been modified;
121 d) definition of MEASUREMENT CATEGORY has been modified, added a definition for MEASURING
122 CIRCUITS and HIGH INTEGRITY component (see also 14.102);
123 e) added a new 3.101 for abbreviated terms and a Table 101;
124 f) in 4.4.2.101, requirements for surge protective components have been modified;
125 g) in 5.1.5.101.2, markings of TERMINALS for MEASUREMENT CATEGORIES have been completed,
126 including the nature of the voltage AC or DC only which is now explicitly permissible;
127 h) 5.101 has been moved to 6.102 as this subclause is relevant to prevention of electric shock;
128 i) 6.5.2.101 has been deleted;
129 j) 6.5.5 has been modified to take into account the automatic disconnection of HAZARD OUS LIVE
130 voltage source;
131 k) 6.5.6 has been modified to take into account voltage-limiting devices used in MEASURING
132 CIRCUITS;
133 l) A note has been added to 6.7.1.3 for guidance about long-term for CREEPAGE DISTANCES;
134 m) 6.101.3 has been completed and moved to 16.4;
135 n) 6.102 has been moved to 16.102;
136 o) subclause 9.1 has been modified;
137 p) 9.101.1 and 9.101.2.1 have been redrafted for clarification, in particular to take into account
138 the recommendations of new Annex N about REASONABLY FORESEEABLE MISUSE;
139 q) a new 9.101.4 for protection of current MEASURING CIRCUITS has been added;
140 r) conformity statement of 9.101.6 has been modified;
141 s) requirements for SPD have been added to 14.8;
142 t) requirements for capacitors have been added to 14.9;
143 u) requirements for HIGH INTEGRITY components have been added in a new 14.102;
144 v) Clause 101 has been deleted; its requirements moved to Clause 9 and Clause 16;
145 w) a new 16.103 for residual current stored in the unit under tests has been added;
146 x) installation limit of CAT IV has been modified in Figure AA.1;
147 y) a new Annex BB for MEASURING CIRCUIT has been added; other annexes have been
148 renumbered;
149 z) a new informative Annex GG describing the effects of capacitors and inductors discharge
150 current has been added.
151 The text of this International Standard is based on the following documents:
Draf t Report on voting
66/xxx/FDIS 66/xxx/RVD
152 Full information on the voting for its approval can be found in the report on voting indicated in
153 the above table.
IEC CDV 61010-2-034 © IEC 2026
154 The language used for the development of this International Standard is English.
155 This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
156 accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
157 at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
158 described in greater detail at www.iec.ch/publications.
159 A list of all parts of the IEC 61010 series, under the general title Safety requirements for
160 electrical equipment for measurement, control, and laboratory use, can be found on the IEC
161 website.
162 This document is to be used in conjunction with IEC 61010-1:2010,
163 IEC 61010-1:2010/AMD1:2016 and IEC 61010-1:2010/AMD2:— .
164 This document supplements or modifies the corresponding clauses in IEC 61010-1 so as to
165 convert that publication into the IEC standard: Particular requirements for measurement
166 equipment for insulation resistance and test equipment for electric strength.
167 Where a particular subclause of IEC 61010-1 is not mentioned in this document, that subclause
168 applies as far as is reasonable. Where this document states "addition", "modification",
169 "replacement", or "deletion", the relevant requirement, test specification or note in IEC 61010-1
170 should be adapted accordingly.
171 In this standard:
172 • the following print types are used:
173 – requirements: in roman type;
174 – NOTES: in small roman type;
175 – conformity and tests: in italic type;
176 – terms used throug hout this standard which have been defined in Clause 3: SMALL ROMAN
177 CAPITALS;
178 • subclauses, figures, tables and notes which are additional to those in IEC 61010-1 are
179 numbered starting from 101. Additional annexes are lettered starting from AA and additional
180 list items are lettered from aa).
181 The committee has decided that the contents of this document will remain unchanged until the
182 stability date indicated on the IEC website under webstore.iec.ch in the data related to the
183 specific document. At this date, the document will be
184 • reconfirmed,
185 • withdrawn,
186 • replaced by a revised edition, or
187 • amended.
IMPORTANT – The "colour inside" logo on the cover page of this document indicates that it
contains colours which are considered to be useful for the correct understanding of its
contents. Users should therefore print this document using a colour printer.

___________
Second amendment under preparation. Stage at the time of publication: IEC FDIS 61010-1/AMD2:2026.
IEC CDV 61010-2-034 © IEC 2026
189 INTRODUCTION
190 IEC 61010-1 specifies the safety requirements that are generally applicable to all equipment
191 within its scope. For certain types of equipment, the requirements of IEC 61010-1 and its
192 amendments will be supplemented or modified by the special requirements of one or more
193 standard from the IEC 61010-2 series which is/are read in conjunction with the requirements of
194 IEC 61010-1.
195 T his document and IEC 61010-2-030, IEC 61010-2-032 and IEC 61010-2-033 specify the safety
196 requirements for equipment with testing or MEASURING CIRCUITS which are connected for test or
197 measurement purposes to devices or circuits outside the measurement equipment itself.
198 According to the type of equipment and combination of functions, several IEC 61010 standards
199 are used in conjunction (see Table 0.1).
200 Table 0.1 – IEC 61010 standards to be applied in case of combined equipment
Additional standards to be applied in case of combined equipment
with additional features or equipment designed for specific use
Type of Applicable
Equipment
Insulation
equipment IEC 61010
Other Hand-held used in
Hand-held
resistance
(example) standards
Multimeter measuring and hand- educational
current test or
and test manipulated establishment
function
measurement
sensing
by pupil
functions probe
function
OPERATORS
Hand-held
Other
and hand- Function Part 2-033 Part 2-034 is
Part 1 + f unctions
manipulated included in is used in
are
Part 2-032
current
the scope included conjunction
included
sensors
Hand-held
multimeters
and other Function Part 2-034 is
Part 1 + Part 2-032
meters for includ ed in used in
It depends
Part 2-033 supersedes
measuring the scope conjunction
mains
Part 031
Part 2-130 is
voltage
applies to
used in
relevant
conjunction
Insulation
accessories
resistance Other
Part 2-032 Function
and test Part 1 + f unctions
is used in Not apply included in
equipment Part 2-034 are
conjunction the scope
for electric included
strength
Other
equipment
Part 2-032 Functions
having Part 1 + Part 2-034
is used in includ ed in
It depends
testing or
Part 2-030 supersedes
conjunction the scope
measuring
circuits
IEC CDV 61010-2-034 © IEC 2026
201 SAFETY REQUIREMENTS FOR ELECTRICAL EQUIPMENT
202 FOR MEASUREMENT, CONTROL, AND LABORATORY USE –

203 Part 2-034: Particular requirements for measurement equipment
204 for insulation resistance and test equipment for electric strength

205 All Clauses and their subclauses, all Annexes, their Clauses and subclauses, and Bibliography
206 of IEC 61010-1:2010, IEC 61010-1:2010/AMD1:2016 and IEC 61010-1:2010/AMD2:— apply
207 except as follows.
1 Scope and object
1.1 Scope
208 1.1.1 Equipment included in scope
209 Replace the existing text of 1.1.1 with the following new text:
210 This part of IEC 61010 specifies safety requirements for equipment for measuring insulation
211 resistance and for equipment for testing electric strength which have an output voltage
212 exceeding 50 V AC or 120 V DC.
213 This document also applies to combined measuring equipment which has an insulation
214 resistance measurement function or an electric strength test measurement function.
215 This group safety publication focusing on safety essential requirements is primarily intended to
216 be used as a product safety standard for the products mentioned in the scope, but is also
217 intended to be used by technical committees in the preparation of publications for products
218 similar to those mentioned in the scope of this document, in accordance with the principles laid
219 down in IEC Guide 104 and lSO/lEC Guide 51.
220 One of the responsibilities of a technical committee is, wherever applicable, to make use of
221 basic safety publications and/or group safety publications in the preparation of its publications.

222 1.1.2 Equipment excluded from scope
223 Add the following two new items after item h) of the list of 1.1.2:
224 aa) IEC 61557-8 (Electrical safety in low voltage distribution systems up to 1 000 V a.c. and
225 1 500 V d.c. – Equipment for testing, measuring or monitoring of protective measures –
226 Part 8: Insulation monitoring devices for IT systems);
227 bb) IEC 61557-9 (Electrical safety in low voltage distribution systems up to 1 000 V AC and
228 1 500 V DC – Equipment for testing, measuring or monitoring of protective measures –
229 Part 9: Equipment for insulation fault location in IT systems).
1.2 Aspects
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Second amendment under preparation. Stage at the time of publication: IEC FDIS 61010-1/AMD2:2026.
IEC CDV 61010-2-034 © IEC 2026
1.2 Aspects
230 1.2.1 Aspects included in scope
231 Replace item c) and item h) from the list of the second paragraph of 1.2.1 with the following
232 new item c) and item h):
233 c) spread of fire or arc flash from the equipment (see Clause 9);
234 h) HAZARDS related to the use and REASONABLY FORESEEABLE MISUSE of the equipment (see
235 Clause 16 and Annex BB).
236 Insert the following new paragraph between the third paragraph and the NOTE of 1.2.1:
237 Annex BB and Annex CC provide g uidance to eq uipment manufacturers on HAZARDS that should
238 be considered for equipment intended for performing tests and measurements on hazardous
239 conductors, including MAINS conductors and telecommunication network conductors.

240 1.2.2 Aspects excluded from scope
241 Add a new item aa) after item h) of the list of 1.2.2:
242 aa) HAZARDS related to the use by pupil OPERATORS in educational establishments (see
243 IEC 61010-2-130).
2 Normative references
244 2 Normative references
245 Insert the following five new normative references in Clause 2:
246 IEC 60364-4-44:2024, Low-voltage electrical installations – Part 4-44: Protection for safety –
247 Protection against voltage disturbances and electromagnetic disturbances
248 IEC 61010-1:2010, Safety requirements for electrical equipment for measurement, control, and
249 laboratory use – Part 1: General requirements
250 IEC 61010-1:2010/AMD1:2016
251 IEC 61010-1:2010/AMD2:—
252 IEC 61010-2-032:— , Safety requirements for electrical equipment for measurement, control,
253 and laboratory use – Part 2-032: Particular requirements for hand-held and hand-manipulated
254 current sensors for electrical test and measurement
255 IEC 61010-031:2022, Safety requirements for electrical equipment for measurement, control and
256 laboratory use – Part 031: Safety requirements for hand-held probe assemblies for electrical
257 measurement and test
3 Terms, definitions and abbreviated terms
258 Replace the existing title of Clause 3 with the following new title:
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Second amendment under preparation. Stage at the time of publication: IEC FDIS 61010-1/AMD2:2026.
Sixth edition under preparation. Stage at the time of publication: IEC CDV 61010-2-032:2026.
IEC CDV 61010-2-034 © IEC 2026
259 3 Terms, definitions and abbreviated terms

260 Add the following new term and definition after 3.2.5:
261 3.2.101
262 MEASURING CIRCUIT
263 testing or measuring circuit (internal to the equipment) which is connected for test or
264 measurement purposes to devices or circuits outside the equipment itself

Replace the definition of 3.5.4 with the following new definition:
266 3.5.4
267 MAINS
268 AC or DC electrical power distribution system (external to the equipment)
269 NOTE 1 to entry: MAINS include p ub lic o r p rivate electrical utilities and , unless o therwise sp ecified in this d ocument,
270 equivalent sources such as motor-driven generators and uninterruptible power supplies.
271 NOTE 2 to entry: This d ef inition d iffers fro m the IEC 61010-1:2010/AMD2:— d ef inition b y allo wing vo ltages g reater
272 than 1 000 V AC and 1 500 V DC and MAINS can be used to power the equipment or be measured.

273 Add the following two new terms and definitions after 3.5.24:
274 3.5.101
275 HIGH INTEGRITY
276 providing a degree of protection against HAZARDS equivalent to two levels of protection
277 NOTE 1 to entry: A HIGH INTEGRITY p art is co nsidered as no t sub ject to f ailure when tests und er f ault co nd itions are
278 made.
279 NOTE 2 to entry: See reinforced protection defined in IEC 60050-903:2013, 903-02-08.
280 3.5.102
281 MEASUREMENT CATEGORY
282 numeral defining MEASURING CIRCUITS according to the type of MAINS to which they are intended
283 to be connected
IEC CDV 61010-2-034 © IEC 2026
284 Add the new following 3.101 and a new Table 101 after 3.6:
285 3.101 Abbreviated terms
286 The list of abbreviated terms and symbols used in this document is given in Table 101:
287 Table 101 – Abbreviated terms
Abbreviated term
Term Note
or symbol
Pertaining to alternating electric quantities such as voltage or
AC alternating current
current, to d evices o perated with these, o r to q uantities asso ciated
with these devices (IEC 60050-151:2001, 151-15-01, modified).
Pertaining to time-independent electric quantities such as voltage
DC direct current
or current, to devices operated with direct voltage and current, or
to quantities associated with these devices (IEC 60050-151:2001,
151-15-02, modified).
RMS root-mean-square For a time-dependent quantity, positive square root of the mean
value o f the sq uare o f the q uantity taken o ver a g iven time interval
(IEC 60050-103:2009/AMD1:2017, 103-02-03, modified).
SPD surge protective Surg e p ro tective d evices co nnected to lo w-voltage power systems
device described in IEC 61643-11.
surge protective Components for low-voltage surge protective devices (SPD)
SPC
component d escrib ed in IEC 61643 series such as IEC 61643-311, IEC 61643-
331, IEC 61643-341.
B BASIC INSULATION or BASIC INSULATION or SUPPLEMENTARY INSULATION is required or
SUPPLEMENTARY allowed.
INSULATION
D DOUBLE INSULATION DOUBLE INSULATION or REINFORCED INSULATION is required or
or REINFORCED
allowed.
INSULATION
OVERVOLTAGE
OVC "OVC" precedes the OVERVOLTAGE CATEGORY numeral.
CATEGORY
CAT MEASUREMENT "CAT" precedes the MEASUREMENT CATEGORY numeral.
CATEGORY
D CLEARANCE f or D is the CLEARANCE that would be applicable to a TRANSIENT
TRANSIENT with the shap e o f a 1,2 × 50 µs impulse (see K.3.2).
OVERVOLTAGE
OVERVOLTAGE
CLEARANCE f or D is the CLEARANCE that wo uld b e ap p licable to the p eak W ORKING
D
2 2
WORKING VOLTAGE VOLTAGE without any TRANSIENT OVERVOLTAGE (see K.3.2).
Um maximum peak U is maximum peak value of the WORKING VOLTAGE plus the
m
value
maximum additional TRANSIENT OVERVOLTAGE (see K.3.2).
Current induced through the device under test by capacitive
I induced current
i nd
coupling between the line to which the device is connected with
overhead high-voltage lines (see 9.101.6).
Voltage induced on the device under test by capacitive coupling
U induced voltage
i nd
between the line to which the device is connected with overhead
high-voltage lines (see 9.101.6).
4 Assessment, tests, and environmental conditions
4.3 Reference test conditions
4.3.2 State of equipment
288 4.3.2.6 Input and output voltages
289 Replace the existing title and text of 4.3.2.6 with the following new title and text:
290 4.3.2.6 Input and output voltages or currents
291 Input and output voltages or currents, including floating voltages but excluding the electrical
292 supply source (see 4.3.2.5), shall be set to any voltage or current within their RATED range, in
293 normal and reverse polarity if possible.
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4.4 Testing in SINGLE FAULT CONDITION
4.4.2 Application of fault conditions
294 4.4.2.1 General
295 Replace the item 2) of the first paragraph of 4.4.2.1 with the following new item 2):
296 2) Applicable fault conditions specified in 4.4.2.2 to 4.4.2.15 and 4.4.2.101;

297 Add the following 4.4.2.101 after 4.4.2.15:
298 4.4.2.101 Surge protective components (SPC)
299 SPCD used in MAINS CIRCUITS or MEASURING CIRCUITS connected to MAINS shall be short-circuited
300 and open-circuited, only one at a time in turn in any convenient order (see also 14.8).
5 Marking and documentation
5 .1 Marking
5 .1 .5 TERM INAL S, connections and operating devices
301 Add the following 5.1.5.101 after 5.1.5.2:
302 5.1.5.101 MEASURING CIRCUIT TERMINALS
303 5.1.5.101.1 General
304 MEASURING CIRCUIT TERMINALS are usually arranged in pairs or sets. Each pair or set of
305 TERMINALS may have a RATED voltage or a RATED current, or both, within that set, and each
306 individual TERMINAL may have a RATED voltag e to earth. For some eq uipment, the RATED voltage
307 between TERMINALS may be different from the RATED voltage to earth. Markings shall be clear
308 to avoid misunderstanding.
309 Some MEASURING CIRCUIT TERMINALS for the equipment within the scope of this document also
310 serve as output TERMINALS.
311 Except as permitted in 5.1.5.101.5:
312 a) each pair or set of MEASURING CIRCUIT TERMINALS that are intended to be used together shall
313 be marked with the value of the RATED voltage or the RATED current, as applicable; and
314 b) MEASURING CIRCUIT TERMINALS RATED for MEASUREMENT CATEGORIES shall be marked with the
315 value of the RATED nominal AC RMS line-to-neutral or DC voltage of MAINS as specified in
316 5.1.5.101.2, and other MEASURING CIRCUIT TERMINALS shall be marked with the value of the
317 RATED voltage to earth; and
318 c) each individual, pair, or set of MEASURING CIRCUIT TERMINALS shall be marked with the
319 pertinent numeral of the MEASUREMENT CATEGORY as specified in 5.1.5.101.2 or with the
320 symbol 14 of Table 1 as specified in 5.1.5.101.3, if applicable.
321 Current MEASURING CIRCUIT TERMINALS not intended for connection to the secondary of current
322 transformers without internal protection shall be marked with symbol 14 of Table 1 (see
323 9.101.4.2).
324 Markings shall be placed adjacent to the TERMINALS. However, if there is insufficient space (as
325 in multi-input equipment), the marking may be on the RATING plate or scale plate, or the
326 TERMINAL may be marked with symbol 14 of Table 1.
327 Any set of MEASURING CIRCUIT TERMINALS does not need to be marked with symbol 14 of T able 1
328 more than once, if it is close to the TERMINALS.
329 Conformity is checked by inspection and, if applicable, as specified in 5.1.5.101.2, 5.1.5.101.3
330 and 5.1.5.101.4, taking the exceptions in 5.1.5.101.5 into account.
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331 5.1.5.101.2 MEASURING CIRCUIT TERMINALS RATED for MEASUREMENT CATEGORIES
332 TERMINALS of MEASURING CIRCUITS RATED for MEASUREMENT CATEGORIES shall be marked with the
333 numeral of the MEASUREMENT CATEGORY and the nominal AC RMS line-to-neutral or DC voltage
334 of the MAINS RATED for the MEASUREMENT CATEGORY.
335 1) The numeral of the MEASUREMENT CATEGORY markings shall be marked "CAT II", "CAT III"
336 or "CAT IV" as applicable.
337 2) The nominal AC RMS line-to-neutral or DC voltage of MAINS being measured is the voltage
338 to earth for MEASUREMENT CATEGORIES. It is taken from the following list:
339 50 V, 100 V, 150 V, 300 V, 600 V, 1 000 V, 1 500 V, 2 000 V and 3 000 V.
340 Marking those TERMINALS with the nature AC or DC of the nominal AC RMS line-to-neutral
341 or DC voltage of the MAINS RATED for the MEASUREMENT CATEGORY only is permissible.
342 LEARANCES and solid insulation for MEASUREMENT CATEGORIES are RATED f or a nominal AC RMS line-
NOTE C
343 MAINS. Neutral is co nsidered to b e earthed (see K.101.2, K.101.4 and
to-neutral vo ltage o r a D C vo ltage o f the
344 Annex I).
345 Marking those TERMINALS with more than one numeral of MEASUREMENT CATEGORY and its
346 nominal AC RMS line-to-neutral or DC voltage of MAINS is permissible.
347 Conformity is checked by inspection.
348 The nominal AC RMS line-to-neutral or DC voltage of MAINS for the MEASUREMENT CATEGORY is
th
349 g iven in the 7 column of T able I.1 from Annex I (Line-to-neutral pertinent to MAINS system type
350 and nominal voltage) for MAINS supply systems up to 1 000 V.
351 The phase-to-phase voltage on these MAINS supply systems can be higher than the nominal AC
352 RMS line-to-neutral or DC voltage of MAINS for the MEASUREMENT CATEGORY.
353 EXAMPLE According to Annex I, the nominal voltages of a three-phase f our-wire systems with earthed neutral in
354 TT system can be 277 V (L-N)/480 V (L-L) while the line-to-neutral pertinent to MAINS system type (the nominal
355 voltage nominal AC RMS line-to-neutral or DC voltage of MAINS) is 300 V.
356 The RATED voltage of the TERMINALS of a MEASURING CIRCUIT intended for MAINS voltage
357 measurements shall be equal to or higher than their nominal AC RMS line-to-neutral or DC
358 voltage of the MAINS RATED for the MEASUREMENT CATEGORY.
359 Conformity is checked by inspection.
360 5.1.5.101.3 MEASURING CIRCUIT TERMINALS RATED for connection to voltages above the
361 levels of 6.3.1
362 TERMINALS of MEASURING CIRCUIT TERMINALS RATED for connection to voltages above the levels
363 of 6.3.1, but not RATED for MEASUREMENT CATEGORIES shall be marked with symbol 14 of T able 1
364 in close proximity to those TERMINALS (see also 5.4.1 bb)).
365 Conformity is checked by inspection.
366 5.1.5.101.4 HAZARDOUS LIVE output TERMINALS
367 Output TERMINALS which can be HAZARDOUS LIVE shall be marked with symbol 12 of Table 1 in
368 close proximity to those TERMINALS.
369 Conformity is checked by inspection.
370 5.1.5.101.5 MEASURING CIRCUIT TERMINALS which are permanently connected, dedicated
371 or for non-HAZARDOUS LIVE voltages
372 MEASURING CIRCUIT TERMINALS do not need to be marked if:
IEC CDV 61010-2-034 © IEC 2026
373 a) they are intended to be permanently connected and not ACCESSIBLE (see 5.4.3 aa) and bb));
374 or
375 b) they are dedicated only for connection to specific TERMINALS of other equipment; or
376 c) it is obvious from other indications that the RATED voltage does not exceed the levels of
377 6.3.1.
378 NOTE Examples of acceptable indications that the RATED voltage of the inputs is intended to not exceed the
379 levels of 6.3.1 include:
380 – the f ull-scale d eflection marking o f a sing le-rang e ind icating vo ltmeter o r ammeter o r maximum marking of
381 a multi-range multimeter;
382 – the maximum range marking of a voltage selector switch;
383 – a marked vo ltage o r p o wer RATING exp ressed in d B, mW o r W, where the eq uivalent value, as exp lained in
384 the documentation, does not exceed 30 V AC.
385 Conformity is checked by inspection.
5.4 Documentation
386 5.4.1 General
387 Add the following two new items to the list of the first paragraph of 5.4.1 after item k):
388 aa) information about each relevant MEASUREMENT CATEGORY if the MEASURING CIRCUIT is
389 RATED for MEASUREMENT CATEGORIES (see 5.1.5.102.2);
390 bb) for MEASURING CIRCUITS that are not RATED for MEASUREMENT CATEGORIES, but that could
391 be misused by connection to such circuits, a warning not to use the equipment for
392 measurements on MAINS, and a detailed RATING including TRANSIENT OVERVOLTAGES (see
393 AA.2.4 for more information).

Insert the following new paragraph between the first and the second paragraph of 5.4.1 after
395 the list:
396 Some equipment may have multiple MEASUREMENT CATEGORY RATINGS for the same MEASURING
397 CIRCUIT. For such equipment, the documentation shall clearly identify the MEASUREMENT
398 CATEGORIES where the equipment is intended to be used and where it shall not be used.

399 RATINGS
5.4.2 Equipment
400 Add the following three new items to the list of the first paragraph of 5.4.2 after item f):
401 aa) the output voltage or voltage range, frequency and current RATING;
402 bb) for insulation resistance measurement equipment, the RATED line or unit capacitance as
403 required by 16.102.1;
404 cc) for insulation resistance measurement equipment intended for use in power station or
405 substation, the RATED induced current (see 9.101.6).

406 5.4.3 Equipment installation
407 Add the following two new items to the list of the first paragraph of 5.4.3 after item h):
408 aa) for MEASURING CIRCUIT TERMINALS intended for permanent connection and that are RATED
409 for MEASUREMENT CATEGORIES, information regarding the MEASUREMENT CATEGORY, RATED
410 voltages or RATED currents as applicable (see 5.1.5.101.2);
411 bb) for MEASURING CIRCUIT TERMINALS intended for permanent connection and that are not
412 RATED for MEASUREMENT CATEGORIES, information regarding the RATED voltages, RATED
IEC CDV 61010-2-034 © IEC 2026
413 currents, and RATED TRANSIENT OVERVOLTAGES as applicable or information for dedicated
414 connection (see 5.1.5.101.5).

415 5.4.4 Equipment operation
416 Add the following four new items to the list of the first paragraph of 5.4.4 after item l):
417 aa) instructions for a daily check before use to ensure the correct functionality of the
418 equipment before use when one HAZARD indicator has been considered to be sufficient in
419 (see 6.102);
NORMAL CONDITION
420 bb) when performing an AC or DC voltage test, instructions to warn the OPERATOR that a
421 hazardous residual voltage can be present after the interruption of the test if the
422 capacitance value of the line or unit under test exceeds the maximum RATED line or unit
423 capacitance value (see 16.102.3 and 16.102.4);
424 cc) when an automatic operation to energise the equipment outputs is provided, a warning to
425 keep distance from the unit under test;
426 dd) when performing an AC or a DC current measurement in series with an inductive circuit,
427 instructions to warn the OPERATOR that a HAZARDOUS LIVE voltage can be present if the
428 circuit is suddenly opened (a probe falls off for example) (see 16.103).
6 Protection against electric shock
6.1 Determination of ACCESSIBLE parts
429 6.1.1 Requirements
430 Add the words “6.101 and 6.102” at the end of the conformity statement of 6.1.1:
6.5 Additional means of protection in case of SINGLE FAULT CONDITIONS
431 6.5.1 General
432 Replace the existing item c) of 6.5.1 with the following new item c):
433 c) automatic disconnection of HAZARDOUS LIVE voltage source (see 6.5.5);

434 Replace in Figure 4, the text in the cell referenced 6.5.1 c) with the following text “Automatic
435 disconnection of HAZARDOUS LIVE voltage source”
6.5.2 PROTECTIVE BONDING
436 6.5.2.3 PROTECTIVE CONDUCTOR TERMINAL
437 Replace the existing item h) 2) of 6.5.2.3 with the following new item h) 2):
438 h) 2) the PROTECTIVE BONDING shall not be interrupted by any switching or interrupting device.
439 Devices used for indirect bonding in MEASURING CIRCUITS (see 6.5.5 and 6.5.6) are permitted
440 to be part of the PROTECTIVE BONDING.
6.5.5 Automatic disconnection of the supply
441 Replace the ex
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