oSIST prEN IEC 61010-2-034:2022

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

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

General Information

• Status: Not Published
• Public Enquiry End Date: 19-Jun-2022
• ICS: 19.080 - Electrical and electronic testing
• ICS: 71.040.10 - Chemical laboratories. Laboratory equipment
• Technical Committee: MOV - Measuring equipment for electromagnetic quantities
• Current Stage: 4020 - Public enquire (PE) (Adopted Project)
• Start Date: 05-Apr-2022
• Due Date: 23-Aug-2022
• Directive: 2014/35/EU - Directive 2014/35/EU of the European Parliament and of the Council of 26 February 2014 on the harmonisation of the laws of the Member States relating to the making available on the market of electrical equipment designed for use within certain voltage limits
• Mandate: M/511 - Mandate to CEN, CENELEC and ETSI relating to harmonised standards in the field of the Low Voltage Directive
• Ref Project: prEN IEC 61010-2-034:2022 - 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

RELATIONS

• Revised: SIST EN IEC 61010-2-034:2021 - 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 (IEC 61010-2-034:2017)
• Effective Date: 10-Aug-2021
• Revised: SIST EN IEC 61010-2-034:2021/A11:2021 - 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
• Effective Date: 10-Aug-2021

Standards Content (sample)

SLOVENSKI STANDARD
oSIST prEN IEC 61010-2-034:2022
01-junij-2022
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 61010-2-034:2022
ICS:
19.080 Električno in elektronsko Electrical and electronic
preskušanje testing
71.040.10 Kemijski laboratoriji. Chemical laboratories.
Laboratorijska oprema Laboratory equipment
oSIST prEN IEC 61010-2-034:2022 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN IEC 61010-2-034:2022
66/756/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 61010-2-034 ED2
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2022-04-01 2022-06-24
SUPERSEDES DOCUMENTS:
66/733/CD, 66/755/CC
IEC TC 66 : SAFETY OF MEASURING, CONTROL AND LABORATORY EQUIPMENT
SECRETARIAT: SECRETARY:
United Kingdom Mr David Hyde
OF INTEREST TO THE FOLLOWING COMMITTEES: PROPOSED HORIZONTAL STANDARD:
TC 78,TC 85
Other TC/SCs are requested to indicate their interest, if
any, in this CDV to the secretary.
FUNCTIONS CONCERNED:
EMC ENVIRONMENT QUALITY ASSURANCE SAFETY

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 drawn to the fact that this Committee Draft
for Vote (CDV) is submitted for parallel voting.
The CENELEC members are invited to vote through the
CENELEC online voting system.

This document is still under study and subject to change. It should not be used for reference 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:

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: 2025
NOTE FROM TC/SC OFFICERS:

Copyright © 2022 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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1 CONTENTS

2 CONTENTS .......................................................................................................................... 2

3 FOREWORD......................................................................................................................... 4

4 CHANGES TO PREVIOUS EDITION ..................................................................................... 6

5 INTRODUCTION ................................................................................................................... 7

6 1 Scope and object ........................................................................................................... 8

7 2 Normative references .................................................................................................... 8

8 3 Terms and definitions .................................................................................................. 10

9 4 Tests ........................................................................................................................... 10

10 5 Marking, documentation and HAZARD indicator .............................................................. 11

11 6 Protection against electric shock .................................................................................. 14

12 7 Protection against mechanical HAZARDS ........................................................................ 22

13 8 Resistance to mechanical stresses ............................................................................... 22

14 9 Protection against the spread of fire and arc flash ........................................................ 22

15 10 Equipment temperature limits and resistance to heat .................................................... 27

16 11 Protection against HAZARDS from fluids and solid foreign objects ................................... 27

17 12 Protection against radiation, including laser sources, and against sonic and

18 ultrasonic pressure ...................................................................................................... 27

19 13 Protection against liberated gases and substances, explosion and implosion ................ 27

20 14 Components and subassemblies .................................................................................. 28

21 15 Protection by interlocks ................................................................................................ 28

22 16 HAZARDS resulting from application .............................................................................. 28

23 17 RISK assessment ......................................................................................................... 28

24 101 Measuring circuits ....................................................................................................... 28

25 Annexes ............................................................................................................................. 31

26 Annex A ............................................................................................................................. 31

27 Annex K (normative) Insulation requirements not covered by 6.7 ........................................ 31

28 Annex L (informative) Index of defined terms ...................................................................... 44

29 Annex AA (normative) MEASUREMENT CATEGORIES ............................................................... 45

30 Annex BB (informative) HAZARDS pertaining to measurements performed in certain

31 environments ............................................................................................................... 48

32 Annex CC (informative) 4-mm "banana" TERMINALS ............................................................. 51

33 Annex DD (informative) Flowchart for insulation according to the type of circuit ................... 53

34 Annex EE (informative) Determination of CLEARANCES for Table 101 .................................... 56

35 Bibliography ....................................................................................................................... 57

37 Figure 101 – Duration of current flow versus body current for a.c. and d.c. currents ............. 16

38 Figure 102 – Test circuit for induced voltage and current ..................................................... 27

39 Figure K.101 – Circuit with protective screen ....................................................................... 35

40 Figure K.102 – Circuit with DOUBLE INSULATION ..................................................................... 35

41 Figure K.103 – Test circuit for evaluation of TRANSIENT OVERVOLTAGE attenuation ................. 38

42 Figure AA.1 – Example to identify the locations of MEASUREMENT CATEGORIES ....................... 46

43 Figure CC.1 – Recommended dimensions of 4-mm TERMINALS ............................................. 52

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44 Figure DD.1 – Requirements for CLEARANCE, CREEPAGE DISTANCE and solid insulation ........... 55

46 Table 101 – CLEARANCES for unmated measuring circuit TERMINALS ...................................... 17

47 Table K.15 – CLEARANCE values for the calculation of K.3.2 ................................................. 32

48 Table K.16 – Test voltages based on CLEARANCES ............................................................... 33

49 Table K.101 - Impulse voltages for circuits connected to MAINS ............................................ 37

50 Table K.102 - CLEARANCES for measuring circuits RATED for MEASUREMENT CATEGORIES ......... 39

51 Table K.103 – Impulse test voltages for testing electric strength of solid insulation for

52 measuring circuits RATED for MEASUREMENT CATEGORIES ....................................................... 40

53 Table K.104 – a.c. test voltages for testing electric strength of solid insulation for

54 measuring circuits RATED for MEASUREMENT CATEGORIES ....................................................... 40

55 Table K.105 – Minimum values for distance or thickness of solid insulation for

56 measuring circuits RATED for MEASUREMENT CATEGORIES ....................................................... 41

57 Table AA.1 – Characteristics of MEASUREMENT CATEGORIES .................................................. 47

58 Table EE.1 – CLEARANCES values for Table 101 ................................................................... 56

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60 INTERNATIONAL ELECTROTECHNICAL COMMISSION
61 ____________
63 SAFETY REQUIREMENTS FOR ELECTRICAL EQUIPMENT
64 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
69 FOREWORD

70 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all

71 national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co -

72 operation on all questions concerning standardization in the electrical and electronic fields. To this end and in

73 addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,

74 Publicly Available Specifications (PAS) and Guides (hereafter referred to as "IEC Publication(s)"). Their preparation

75 is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may

76 participate in this preparatory work. International, governmental and non-governmental organizations liaising with

77 the IEC also participate in this preparation. IEC collaborates closely with the International Organization for

78 Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.

79 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international

80 consensus of opinion on the relevant subjects since each technical committee has representation from all interested

81 IEC National Committees.

82 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

83 Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC

84 Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any

85 misinterpretation by any end user.

86 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications

87 transparently to the maximum extent possible in their national and regional publications. Any divergence between

88 any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.

89 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity

90 assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any services

91 carried out by independent certification bodies.

92 6) All users should ensure that they have the latest edition of this publication.

93 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and

94 members of its technical committees and IEC National Committees for any personal injury, property damage or

95 other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses

96 arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications.

97 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

98 indispensable for the correct application of this publication.

99 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent

100 rights. IEC shall not be held responsible for identifying any or all such patent rights.

101 International Standard IEC 61010-2-034 has been prepared by IEC technical committee 66:

102 Safety of measuring, control and laboratory equipment.

103 It has the status of a group safety publication in accordance with IEC Guide 104.

104 This second edition cancels and replaces the first edition published in 2017. This edition

105 constitutes a technical revision.
106 The text of this International Standard is based on the following documents:
FDIS Report on voting
66/xxx/FDIS 66/xxx/RVD
107

108 Full information on the voting for the approval of this International Standard can be found in the

109 report on voting indicated in the above table.
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110 This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

111 A list of all parts of the IEC 61010 series, under the general title Safety requirements for electrical

112 equipment for measurement, control, and laboratory use, can be found on the IEC website.

113 This Part 2-034 is to be used in conjunction with IEC 61010-1:2010/AMD1:2016. It was

114 established on the basis of the third edition (2010) of IEC 61010-1, including its amendment 1

115 (2016) and its corrigendum 1 (2019).

116 This Part 2-034 supplements or modifies the corresponding clauses in IEC 61010-1 so as to

117 convert that publication into the IEC standard: Particular requirements for measurement

118 equipment for insulation resistance and test equipment for electric strength.

119 Where a particular subclause of Part 1 is not mentioned in this Part 2-034, that subclause applies

120 as far as is reasonable. Where this part states “addition”, “modification”, “replacement”, or

121 “deletion” the relevant requirement, test specification or note in Part 1 should be adapted

122 accordingly.
123 In this standard:
124 a) the following print types are used:
125 – requirements: in roman type;
126 – NOTES: in small roman type;
127 – conformity and tests: in italic type;

128 – terms used throughout this standard which have been defined in Clause 3: SMALL ROMAN

129 CAPITALS;

130 b) subclauses, figures, tables and notes which are additional to those in Part 1 are numbered

131 starting from 101. Additional annexes are lettered starting from AA and additional list items

132 are lettered from aa).

133 The committee has decided that the contents of this document will remain unchanged until the

134 stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to

135 the specific document. At this date, the document will be
136 • reconfirmed,
137 • withdrawn,
138 • replaced by a revised edition, or
139 • amended.

IMPORTANT – The 'colour inside' logo on the cover page of this publication 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.

140
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141 CHANGES TO PREVIOUS EDITION

142 This edition includes numerous editorial changes and the following significant technical changes

143 with respect to the previous edition.

144 a) 1.2.1: requirements for protection against HAZARDS which could occur from reading a voltage

145 have been added to the scope.

146 b) Clause 2: all normative references have been dated; new normative references have been

147 added.
148 c) 4.3.2.5: requirements for power supply have been modified.
149 d) 4.3.2.6: requirements for inputs/outputs have been modified.

150 e) 5.1.5.101.2: minimum RATINGS for voltage of measuring TERMINALS are required.

151 f) 5.4.2: new information about RATINGS in documentation have been added.
152 g) 5.4.4: new instructions for operation have been added.

153 h) 5.101.1: HAZARD indicators shall be functional in NORMAL CONDITION and in SINGLE FAULT

154 CONDITION.

155 i) 6.6.101.1: insulating material of group I may be allowed for determination of CREEPAGE

156 DISTANCES of measuring circuit TERMINALS.

157 j) 6.6.101.2: CLEARANCES and CREEPAGE DISTANCES above 1 000 V a.c. and 1 500 V d.c. for

158 measuring circuit TERMINALS in unmated position have been defined.

159 k) 6.6.101.3: requirements for measuring circuit TERMINALS in partially-mated position have

160 been specified.

161 l) 6.6.101.4: requirements for measuring circuit TERMINALS in mated position have been

162 specified.
163 m) 6.102 replaces 6.9.103 and has been rephrased.

164 n) A new 9.101 to consider the protection of measuring circuits against the spread of fire and

165 arc flash has been added. Table 102 has been replaced by Table K.101.
166 o) 9.101.2 is a relocation of 101.3.

167 p) 9.101.3 is a relocation of 101.4 It has been extended to MEASUREMENT CATEGORY II and refers

168 to IEC 61000-4-5 for tests.
169 q) 9.101.4 is a relocation of 16.1.102.

170 r) 9.101.5 is a relocation of K.103 for induced current and has numerous changes.

171 s) 14.101 has been removed. Consequently, 14.102 becomes 14.101.

172 t) 101.3 and 101.4 having been moved to 9.101.2 and 9.101.3, 101.5 becomes 101.3 with more

173 protections against HAZARD occurring from reading a voltage value.

174 u) K.2.1: another method for determination of CLEARANCES of secondary circuits is proposed.

175 v) K.3.101 is a relocation of 6.9.104.
176 w) Clause K.102 is a relocation with clarifications of Clause K.103.

177 x) Table K.103 and Table K.104 replace Table K.102, Table K.103 and Table K.104.

178 y) K.101.4 has been reviewed. Tables and tests for solid insulation have been modified. Table

179 K.105 replaces Table K.9.
180 z) Table K.106 has been replaced by Table K.101.

181 aa) Clause K.4 has been completely redrafted and propose now a method to determine U for

182 circuits which reduce TRANSIENT OVERVOLTAGES.
183
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184 INTRODUCTION

185 IEC 61010-1 specifies the safety requirements that are generally applicable to all equipment

186 within its scope. For certain types of equipment, the requirements of IEC 61010-1 and its

187 amendment will be supplemented or modified by the special requirements of one, or more than

188 one, Part 2 which are read in conjunction with the Part 1 requirements.

189 This Part 2-034 specifies the safety requirements for measurement equipment for insulation

190 resistance and test equipment for electric strength which are connected to units, lines or circuits

191 for test or measurement purposes.

192 Part 2-030 specifies the safety requirements for equipment with testing or measuring circuits

193 which are connected for test or measurement purposes to devices or circuits outside the

194 measurement equipment itself.

195 Part 2-032 specifies the safety requirements for HAND-HELD and hand-manipulated current

196 sensors for measuring, detecting or injecting current, or indicating current waveforms on circuits

197 without physically opening the current path of the circuit being measured.

198 Part 2-033 specifies the safety requirements for hand-held multimeters for domestic and

199 professional use, capable of measuring MAINS voltage, intended to measure voltage and other

200 electrical quantities such as resistance or current.

201 All requirements of Part 2-030 have been included into Part 2-034. Equipment within the scopes

202 of both Part 2-030 and Part 2-034 are considered to be covered by the requirements of this

203 Part 2-034.

204 However, for equipment within the scope of Part 2-032, Part 2-033 and Part 2-034, these

205 standards are read in conjunction.
206
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207 SAFETY REQUIREMENTS FOR ELECTRICAL EQUIPMENT
208 FOR MEASUREMENT, CONTROL, AND LABORATORY USE –
209
210 Part 2-034: Particular requirements for measurement equipment
211 for insulation resistance and test equipment for electric strength
212
213
214
215 1 Scope and object
216 This clause of Part 1 is applicable except as follows:
217 1.1.1 Equipment included in scope
218 Replace the existing text with the following:

219 This group safety publication is primarily intended to be used as a product safety standard for

220 the products mentioned in the scope, but shall also be used by technical committees in the

221 preparation of their publications for products similar to those mentioned in the scope of this

222 standard, in accordance with the principles laid down in IEC Guide 104 and lSO/lEC Guide 51.

223 This part of IEC 61010 specifies safety requirements to equipment for measuring insulation

224 resistance and to equipment for testing electric strength which have an output voltage exceeding

225 50 V a.c. or 120 V d.c.

226 This document also applies to combined measuring equipment which has an insulation resistance

227 measurement function or an electric strength test measurement function.
228 1.1.2 Equipment excluded from scope
229 Add the following new items to the list:

230 aa) IEC 61557-8, Electrical safety in low voltage distribution systems up to 1 000 V a.c. and

231 1 500 V d.c. – Equipment for testing, measuring or monitoring of protective measures –

232 Part 8: Insulation monitoring devices for IT systems;

233 bb) IEC 61557-9, Electrical safety in low voltage distribution systems up to 1 000 V a.c. and

234 1 500 V d.c. – Equipment for testing, measuring or monitoring of protective measures –

235 Part 9: Equipment for insulation fault location in IT systems.
236 1.2.1 Aspects included in scope
237 Replace the third paragraph with the following new paragraph:

238 Requirements for protection against HAZARDS arising from NORMAL USE, REASONABLY FORESEEABLE

239 MISUSE and ergonomic factors are specified in Clause 16 and Clause 101.
240 2 Normative references
241 This clause of Part 1 is applicable except as follows:
242 Replace the following existing normative references:

243 IEC 60364-4-44:2007, Low-voltage electrical installations – Part 4-44: Protection for safety –

244 Protection against voltage disturbances and electromagnetic disturbances IEC 60364-4-

245 44:2007/AMD1:2015
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246 IEC 61010-031, Safety requirements for electrical equipment for measurement, control and

247 laboratory use – Part 031: Safety requirements for hand-held probe assemblies for electrical

248 measurement and test

249 IEC 61180 (all parts), High-voltage test techniques for low-voltage equipment

250 IEC 61180-1, High-voltage test techniques for low-voltage equipment – Part 1: Definitions, test

251 and procedure requirements

252 IEC 61180-2, High-voltage test techniques for low-voltage equipment – Part 2: Test equipment

253 IEC 61672-1, Electroacoustics – Sound level meters – Part 1: Specifications

254 IEC 61672-2, Electroacoustics – Sound level meters – Part 2: Pattern evaluation tests

255 with the following new normative references:

256 IEC 60364-4-44:2007/AMD1:2015/AMD2:2018, Low-voltage electrical installations – Part 4-44:

257 Protection for safety – Protection against voltage disturbances and electromagnetic disturbances

258 IEC 61010-031:2023 , Safety requirements for electrical equipment for measurement, control

259 and laboratory use – Part 031: Safety requirements for hand-held and hand-manipulated probe

260 assemblies for electrical test and measurement

261 IEC 61180:2016, High-voltage test techniques for low-voltage equipment – Definitions, test and

262 procedure requirements, test equipment

263 NOTE IEC 61180:2016 replaces everywhere IEC 61180, IEC 61180-1 and IEC 61180-2 are referenced in Part 1.

264 IEC 61672-1:2013, Electroacoustics – Sound level meters – Part 1: Specifications

265 IEC 61672-2:2013/AMD1:2017, Electroacoustics – Sound level meters – Part 2: Pattern

266 evaluation tests
267 Add the following new normative references:

268 IEC 60479-1:2018, Effects of current on human beings and livestock - Part 1: General aspects

269 IEC 60479-2:2019, Effects of current on human beings and livestock - Part 2: Special aspects

270 IEC 60664-1:2020, Insulation coordination for equipment within low-voltage supply systems -

271 Part 1: Principles, requirements and tests

272 IEC 61000-4-5:2014/AMD1:2017, Electromagnetic compatibility (EMC) - Part 4-5: Testing and

273 measurement techniques - Surge immunity test

274 IEC 61010-2-032:2019, Safety requirements for electrical equipment for measurement, control,

275 and laboratory use – Part 2-032: Particular requirements for hand-held and hand-manipulated

276 current sensors for electrical test and measurement
———————
Under preparation. Stage at the time of publication: IEC 61010-031/Ed.3/CDV.
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277 3 Terms and definitions
278 This clause of Part 1 is applicable except as follows:
279 3.5 Safety terms
280 Replace the definition of 3.5.4 with the following new definition:
281 3.5.4
282 MAINS
283 electricity supply system
284 Add the following new term and definition:
285 3.5.101
286 MEASUREMENT CATEGORY

287 classification of testing and measuring circuits according to the type of MAINS to which they are

288 intended to be connected

289 Note 1 to entry: MEASUREMENT CATEGORIES take into account OVERVOLTAGE CATEGORIES, short-circuit current levels,

290 the location where the test or measurement is to be made and some forms of energy limitation or transient protection

291 included in the building installation (see Annex AA for more information).
292 4 Tests
293 This clause of Part 1 is applicable except as follows:
294 4.3.2.5 MAINS supply
295 Replace the existing title and text with:
296 4.3.2.5 Power supply
297 The following requirements apply:

298 a) the MAINS supply voltage shall be between 90 % and 110 % of any RATED supply voltage for

299 which the equipment can be set or, if the equipment is RATED for a greater fluctuation, at any

300 supply voltage within the fluctuation range;
301 b) the MAINS frequency shall be any RATED frequency;

302 c) equipment for both a.c. and d.c. shall be connected to an a.c. or d.c. supply;

303 d) equipment powered by single-phase a.c. MAINS supply shall be connected both with normal

304 and reverse polarity;

305 e) if the means of connection permit reversal, battery-operated and d.c. equipment shall be

306 connected with both reverse and normal polarity.
307 4.3.2.6 Input and output voltages
308 Replace the existing title and text with:
309 4.3.2.6 Input and output voltages or currents

310 Input and output voltages or currents, including floating voltages but excluding the MAINS supply

311 voltage, shall be set to any voltage or current within their RATED range, in normal and reverse

312 polarity if possible.
313 Add the following new subclause:
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314 4.4.2.15 Surge protective devices
315 Surge protective devices shall be short-circuited and open-circuited.
316 5 Marking and documentation
317 Replace the existing title with:
318 5 Marking, documentation and HAZARD indicator
319 This clause of Part 1 is applicable except as follows:
320 5.1.5 TERMINALS, connections and operating devices
321 Add the following new subclause:
322 5.1.5.101 Measuring circuit TERMINALS
323 5.1.5.101.1 General
324 Some measuring circuit TERMINALS
...