Basic and safety principles for man-machine interface, marking and identification - Identification of equipment terminals, conductor terminations and conductors

IEC 60445:2021 is available as IEC 60445:2021 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.IEC 60445:2021 applies to the identification and marking of terminals of electrical equipment such as resistors, fuses, relays, contactors, transformers, rotating machines and, wherever applicable, to combinations of such equipment (e.g. assemblies), and also applies to the identification of terminations of certain designated conductors. It also provides general rules for the use of certain colours or alphanumeric notations to identify conductors with the aim of avoiding ambiguity and ensuring safe operation. These conductor colours or alphanumeric notations are intended to be applied in cables or cores, busbars, electrical equipment and installations. This basic safety publication is primarily intended for use by technical committees in the preparation of standards in accordance with the principles laid down in IEC Guide 104 and ISO/IEC Guide 51. It has the status of a basic safety publication in accordance with IEC Guide 104. IEC 60445:2021 cancels and replaces the sixth edition published in 2017. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) the definitions have been aligned with IEC 60050-195:2021 and IEC 60050-826; b) the provisions for colour to be used for identification of certain designated conductors are made requirements and not only recommendations; c) introduction of a new subclause on marking of protective terminals for multiple power supply inputs on equipment.

Grund- und Sicherheitsregeln für die Mensch-Maschine-Schnittstelle - Kennzeichnung von Anschlüssen elektrischer Betriebsmittel, angeschlossenen Leiterenden und Leitern

Principes fondamentaux et de sécurité pour les interfaces hommes-machines, le marquage et l'’identification - Identification des bornes de matériels, des extrémités de conducteurs et des conducteurs

IEC 60445:2021 est disponible sous forme de IEC 60445:2021 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.L'IEC 60445:2021 s’applique à l’identification et au marquage des bornes de matériels électriques, tels que résistances, coupe-circuits à fusibles, relais, contacteurs, transformateurs, machines tournantes et, chaque fois que cela est possible, à des combinaisons de tels matériels (par exemple des ensembles). Il s’applique également à l’identification des extrémités de certains conducteurs désignés. Il prévoit également des règles générales concernant l’utilisation de certaines couleurs ou de certains caractères alphanumériques pour identifier les conducteurs dans le but d’éviter toute ambiguïté et d’assurer la sécurité de fonctionnement. Ces couleurs et caractères alphanumériques destinés aux conducteurs sont prévus pour être appliqués aux noyaux, aux barres omnibus et aux matériels électriques, ainsi qu’aux câbles ou installations. La présente publication fondamentale de sécurité axée sur les exigences de sécurité essentielles est principalement destinée à être utilisée par les comités d’études lors de l’élaboration des normes conformément aux principes énoncés dans le Guide 104 de l’IEC et le Guide ISO/IEC 51. L'IEC 60445:2021 annule et remplace la sixième édition parue en 2017. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l’édition précédente: a) les définitions ont été harmonisées avec l’IEC 60050-195:2021 et l’IEC 60050-826; b) les dispositions relatives aux couleurs à utiliser pour l’identification de certains conducteurs désignés sont à présent des exigences et ne sont plus de simples recommandations; c) introduction d’un nouveau paragraphe sur le marquage des bornes de protection pour des entrées d’alimentation multiples sur un matériel.

Osnovna in varnostna načela za vmesnik človek-stroj, označevanje in razpoznavanje - Razpoznavanje terminalov opreme, končnikov vodnikov in vodnikov

General Information

Status
Published
Current Stage
6060 - Document made available
Due Date
03-Sep-2021
Completion Date
03-Sep-2021

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SLOVENSKI STANDARD
oSIST prEN IEC 60445:2021
01-januar-2021
Osnovna in varnostna načela za vmesnik človek-stroj, označevanje in
razpoznavanje - Razpoznavanje terminalov opreme, končnikov vodnikov in
vodnikov

Basic and safety principles for man-machine interface, marking and identification -

Identification of equipment terminals, conductor terminations and conductors

Grund- und Sicherheitsregeln für die Mensch-Maschine-Schnittstelle - Kennzeichnung

von Anschlüssen elektrischer Betriebsmittel, angeschlossenen Leiterenden und Leitern

Principes fondamentaux et de sécurité pour les interfaces hommes-machines, le

marquage et lidentification - Identification des bornes de matériels, des extrémités de

conducteurs et des conducteurs
Ta slovenski standard je istoveten z: prEN IEC 60445:2020
ICS:
01.080.20 Grafični simboli za posebno Graphical symbols for use on
opremo specific equipment
13.110 Varnost strojev Safety of machinery
29.020 Elektrotehnika na splošno Electrical engineering in
general
oSIST prEN IEC 60445:2021 en,fr,de

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

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3/1461/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 60445 ED7
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2020-11-20 2021-02-12
SUPERSEDES DOCUMENTS:
3/1450/CD, 3/1460/CC

IEC TC 3 : DOCUMENTATION, GRAPHICAL SYMBOLS AND REPRESENTATIONS OF TECHNICAL INFORMATION

SECRETARIAT: SECRETARY:
Sweden Mr Thomas Borglin
OF INTEREST TO THE FOLLOWING COMMITTEES: PROPOSED HORIZONTAL STANDARD:
TC 20,TC 44,TC 64
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:

Basic and safety principles for man-machine interface, marking and identification - Identification

of equipment terminals, conductor terminations and conductors
PROPOSED STABILITY DATE: 2026
NOTE FROM TC/SC OFFICERS:

Copyright © 2020 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 ............................................................................................................................ 1

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

4 1 Scope .............................................................................................................................. 6

5 2 Normative references ...................................................................................................... 6

6 3 Terms and definitions ...................................................................................................... 6

7 4 Methods of identification ................................................................................................ 10

8 5 Application of identification means ................................................................................. 10

9 6 Identification by colours ................................................................................................. 11

10 6.1 General ................................................................................................................. 11

11 6.2 Use of single colours ............................................................................................ 11

12 6.2.1 The use of the single colours GREEN and YELLOW ...................................... 11

13 6.2.2 Neutral or mid-point conductor ....................................................................... 11

14 6.2.3 Line conductor in AC system ......................................................................... 12

15 6.2.4 Line conductor in DC system ......................................................................... 12

16 6.2.5 Functional earthing conductor ........................................................................ 12

17 6.3 Use of bi-colour combinations ............................................................................... 12

18 6.3.1 Permitted colours .......................................................................................... 12

19 6.3.2 Protective conductor ...................................................................................... 12

20 6.3.3 PEN conductor .............................................................................................. 13

21 6.3.4 PEL conductor ............................................................................................... 13

22 6.3.5 PEM conductor .............................................................................................. 13

23 6.3.6 Protective bonding conductor ........................................................................ 14

24 7 Identification by alphanumeric notation .......................................................................... 14

25 7.1 General ................................................................................................................. 14

26 7.2 Equipment terminal identification – Marking principles .......................................... 14

27 7.3 Identification of certain designated conductors ...................................................... 17

28 7.3.1 General ......................................................................................................... 17

29 7.3.2 Neutral conductor .......................................................................................... 17

30 7.3.3 Protective conductor ...................................................................................... 17

31 7.3.4 PEN conductor .............................................................................................. 17

32 7.3.5 PEL conductor ............................................................................................... 17

33 7.3.6 PEM conductor .............................................................................................. 17

34 7.3.7 Protective bonding conductor ........................................................................ 17

35 7.3.8 Functional earthing conductor ........................................................................ 18

36 7.3.9 Functional bonding conductor ........................................................................ 18

37 7.3.10 Mid-point conductor ....................................................................................... 18

38 7.3.11 Line conductor ............................................................................................... 18

39 7.3.12 System-referencing-conductor ....................................................................... 18

40 Annex A (informative) Colours, alphanumeric notations and graphical symbols used

41 for identification of conductors and terminals ................................................................. 19

42 Annex B (informative) List of notes concerning certain countries .......................................... 21

43 Bibliography .......................................................................................................................... 27

45 Figure 1 – Single element with two terminals ........................................................................ 15

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46 Figure 2 – Single element with four terminals: Two endpoints and two intermediate

47 points ................................................................................................................................... 15

48 Figure 3 – Three-phase equipment with six terminals ............................................................ 15

49 Figure 4 – Three-element equipment with twelve terminals: Six endpoints and six

50 intermediate points ............................................................................................................... 16

51 Figure 5 – Equipment with groups of elements ...................................................................... 16

52 Figure 6 – Interconnection of equipment terminals and certain designated conductors .......... 17

54 Table A.1 – Colours, alphanumeric notations and graphical symbols used for

55 identification of conductors and terminals ............................................................................. 19

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58 INTERNATIONAL ELECTROTECHNICAL COMMISSION
59 ____________
61 BASIC AND SAFETY PRINCIPLES FOR MAN-MACHINE
62 INTERFACE, MARKING AND IDENTIFICATION –
63 IDENTIFICATION OF EQUIPMENT TERMINALS,
64 CONDUCTOR TERMINATIONS AND CONDUCTORS
66 FOREWORD

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

68 all national electrotechnical committees (IEC National Committees). The object of IEC is to promote

69 international co-operation on all questions concerning standardization in the electrical and electronic fields. To

70 this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,

71 Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC

72 Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested

73 in the subject dealt with may participate in this preparatory work. International, governmental and non-

74 governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely

75 with the International Organization for Standardization (ISO) in accordance with conditions determined by

76 agreement between the two organizations.

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

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

79 interested IEC National Committees.

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

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

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

83 misinterpretation by any end user.

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

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

86 between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in

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

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

101 This document has been prepared by IEC technical committee 3: Documentation, graphical

102 symbols and representations of technical information.

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

104 This seventh edition cancels and replaces the sixth edition of IEC 60445, published in 2017.

105 This edition includes the following significant technical changes with respect to the previous

106 edition:

107 a) the definitions have been aligned with the latest edition of IEV 195 and IEV 826 (currently

108 marked as of 202x);

109 b) the requirements for the colour to be used for identification of certain designated

110 conductors are made normative and not only recommendations;
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111 c) introduction of a new sub-clause on marking of protecting earthing terminal for multiple

112 power supply input on an equipment;
113
114 The text of this International Standard is based on the following documents:
FDIS Report on voting
3/XXX/FDIS 3/XXX/RVD
115

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

117 the report on voting indicated in the above table.

118 This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

119 The reader's attention is drawn to the fact that Annex B lists all of the “in-some-country”

120 clauses on differing practices of a less permanent nature relating to the subject of this

121 standard.

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

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

124 the specific document. At this date, the document will be
125 • reconfirmed,
126 • withdrawn,
127 • replaced by a revised edition, or
128 • amended.
129

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.
130
131
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132 BASIC AND SAFETY PRINCIPLES FOR MAN-MACHINE
133 INTERFACE, MARKING AND IDENTIFICATION –
134 IDENTIFICATION OF EQUIPMENT TERMINALS,
135 CONDUCTOR TERMINATIONS AND CONDUCTORS
136
137
138
139 1 Scope

140 This document applies to the identification and marking of terminals of electrical equipment

141 such as resistors, fuses, relays, contactors, transformers, rotating machines and, wherever

142 applicable, to combinations of such equipment (e.g. assemblies), and also applies to the

143 identification of terminations of certain designated conductors. It also provides general rules

144 for the use of certain colours or alphanumeric notations to identify conductors with the aim of

145 avoiding ambiguity and ensuring safe operation. These conductor colours or alphanumeric

146 notations are intended to be applied in cables or cores, busbars, electrical equipment and

147 installations.

148 This basic safety publication is primarily intended for use by technical committees in the

149 preparation of standards in accordance with the principles laid down in IEC Guide 104 and

150 ISO/IEC Guide 51.

151 It is not intended for use by manufacturers or certification bodies. One of the responsibilities

152 of a technical committee is, wherever applicable, to make use of basic safety publications in

153 the preparation of its publications. The requirements of this basic safety publication will not

154 apply unless specifically referred to or included in the relevant publications.

155 2 Normative references

156 The following documents are referred to in the text in such a way that some or all of their

157 content constitutes requirements of this document. For dated references, only the edition

158 cited applies. For undated references, the latest edition of the referenced document (including

159 any amendments) applies.
160 IEC 60417, Graphical symbols for use on equipment
161 IEC 60617, Graphical symbols for diagrams

162 IEC Guide 104, The preparation of safety publications and the use of basic safety publications

163 and group safety publications

164 ISO/IEC Guide 51, Safety aspects – Guidelines for their inclusion in standards

165 3 Terms and definitions

166 For the purposes of this document, the following terms and definitions apply.

167 ISO and IEC maintain terminological databases for use in standardization at the following

168 addresses:
169 • IEC Electropedia: available at http://www.electropedia.org/
170 • ISO Online browsing platform: available at http://www.iso.org/obp
171 NOTE The terms are sorted in alphabetical order in the English language.
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172 3.1
173 earth, verb
174 ground, verb, US
175 to make an electric connection between a conductive part and a local earth
176 Note 1 to entry: The connection to local earth can be
177 – intentional, or
178 – unintentional or accidental
179 and can be permanent or temporary.
180 [SOURCE: IEC 60050-195: 202x, 195-01-08]
181 3.2
182 earthed protective bonding conductor
183 protective bonding conductor which has a conductive path to local earth
184 3.3
185 electrical equipment

186 item used for such purposes as generation, conversion, transmission, distribution or utilization

187 of electric energy, such as electric machines, transformers, switchgear and controlgear,

188 measuring instruments, protective devices, wiring systems, current-using equipment

189 [SOURCE: IEC 60050-826:202x, 826-16-01]
190 3.4
191 electrical safety
192 freedom from risk that is not tolerable and which is caused by electricity
193 [SOURCE: IEC 60050-195:202x, 195-01-20]
194 3.5
195 equipotential bonding

196 set of electric connections intended to achieve equipotentiality between conductive parts

197 [SOURCE: IEC 60050-195: 202x, 195-01-10]
198 3.6
199 equipotentiality
200 state when conductive parts are at a substantially equal electric potential
201 [SOURCE: IEC 60050-195: 202x, 195-01-09]
202 3.7
203 functional bonding conductor
204 conductor provided for functional-equipotential-bonding
205 [SOURCE: IEC 60050-195: 202x, 195-02-16]
206 3.8
207 functional earthing
208 functional grounding (US)
209 earthing for purposes other than electrical safety
210 [SOURCE: IEC 60050-195:202x, 195-01-13]
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211 3.9
212 functional earthing conductor
213 functional grounding conductor, US
214 conductor provided for functional earthing
215 [SOURCE: IEC 60050-195: 202x, 195-02-15]
216 3.10
217 functional-equipotential-bonding
218 equipotential bonding for reasons other than electrical safety
219 [SOURCE: IEC 60050-195: 202x, 195-01-16]
220 3.11
221 line conductor

222 conductor intended to be energized and capable of contributing to the transmission or

223 distribution of electric energy but which is not a neutral conductor or mid-point conductor

224 [SOURCE: IEC 60050-195: 202x, 195-02-08, modified – Note 1 to entry removed]
225 3.12
226 mid-point

227 common point between two symmetrical circuit elements of which the opposite ends are

228 electrically connected to different line conductors of the same circuit
229 [SOURCE: IEC 60050-195:202x, 195-02-04]
230 3.13
231 mid-point conductor

232 conductor electrically connected to the mid-point and capable of contributing to the

233 distribution of electric energy
234 [SOURCE: IEC 60050-195: 202x, 195-02-07]
235 3.14
236 neutral conductor

237 conductor electrically connected to the neutral point and capable of contributing to the

238 distribution of electric energy
239 [SOURCE: IEC 60050-195: 202x, 195-02-06]
240 3.15
241 neutral point
242 common point of a star-connected polyphase system
243 [SOURCE: IEC 60050-195:202x, 195-02-05]
244 3.16
245 PEL conductor

246 conductor combining the functions of both a protective earthing conductor and a line

247 conductor
248 [SOURCE: IEC 60050-195: 202x, 195-02-14]
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249 3.17
250 PEM conductor

251 conductor combining the functions of both a protective earthing conductor and a mid-point

252 conductor
253 [SOURCE: IEC 60050-195: 202x, 195-02-13]
254 3.18
255 PEN conductor

256 conductor combining the functions of both a protective earthing conductor and a neutral

257 conductor
258 [SOURCE: IEC 60050-195: 202x, 195-02-12]
259 3.19
260 protective bonding conductor
261 protective conductor provided for protective-equipotential-bonding
262 [SOURCE: IEC 60050-195: 202x, 195-02-10]
263 3.20
264 protective conductor
265 equipment grounding conductor, US
266 grounding electrode conductor, US
267 conductor provided for purposes of electrical safety

268 Note 1 to entry: The terms equipment grounding conductor and grounding electrode conductor are used in the US

269 depending on their application.

270 [SOURCE: IEC 60050-195: 202x, 195-02-09, modified – two synonyms and note 1 to entry

271 have been added.]
272 3.21
273 protective earthing
274 protective grounding, US
275 earthing for purposes of electrical safety
276 [SOURCE: IEC 60050-195: 202x, 195-01-11]
277 3.22
278 protective earthing conductor
279 PE conductor
280 protective grounding conductor, US
281 protective conductor provided for protective earthing
282 [SOURCE: IEC 60050-195: 202x, 195-02-11]
283 3.23
284 protective-equipotential-bonding
285 equipotential bonding for the purposes of electrical safety
286 [SOURCE: IEC 60050-195: 202x, 195-01-15]
287 3.24
288 protective terminal

289 terminal provided on equipment and intended for the electric connection with a protective

290 conductor
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291 [SOURCE: IEC 60050-195:202x, 195-02-43]
292 3.25
293 system-referencing-conductor

294 conductor between a live conductor and the earthing arrangement to enable the live

295 conductor to be substantially at the same potential as the Earth
296 [SOURCE: IEC 60050-826:202x, 826-13-38]
297 3.26
298 terminal

299 conductive part of an electrical equipment provided for connecting that electrical equipment to

300 one or more external conductors

301 [SOURCE: IEC 60050-151:2001, 151-12-12, modified – “device, electric circuit or electric

302 network” is replaced by ”electrical equipment”, and note 1 to entry is removed]

303 3.27
304 unearthed protective bonding conductor
305 protective bonding conductor which is isolated from the Earth
306 4 Methods of identification

307 Where the identification of equipment terminals and of terminations of certain designated

308 conductors is considered necessary, it shall be effected by the use of one or more of the

309 following methods:

310 – the physical or relative location of the equipment terminals or of terminations of certain

311 designated conductors;

312 – a colour code for equipment terminals and terminations of certain designated conductors

313 in accordance with Clause 6;

314 – graphical symbols in accordance with IEC 60417. If additional symbols are required, these

315 shall be consistent with IEC 60617;

316 – an alphanumeric notation in accordance with the system laid down in Clause 7.

317 To keep consistency with the documentation, conductor and equipment terminal designation,

318 the alphanumeric notation is recommended.

319 Identification of conductors by colours shall be in accordance with the requirements provided

320 in Clause 6. Identification of conductors by alphanumeric notation shall be in accordance with

321 the requirements provided in Clause 7.

322 NOTE It is recognised that for complex systems and installations additional marking and labelling are used for

323 reasons other than safety, see for example IEC 62491.
324 5 Application of identification means

325 The identifying colour, graphical symbol or alphanumeric notation shall be located on, or

326 adjacent to, the corresponding terminal.

327 When more than one identification method is used and confusion is possible, the correlation

328 between the methods shall be clarified in the associated documentation.

329 When no confusion is possible, the juxtaposition of numerical and alphanumeric notation may

330 be applied.
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331 Terminals and conductors used for earthing are divided concerning their purpose of earthing

332 into the two basic concepts of protective earthing and functional earthing:

333 – If a terminal or conductor fulfils the requirements for both protective earthing and

334 functional earthing, it shall be designated as a protective earthing terminal or protective

335 earthing conductor, respectively.

336 – If the requirements for protective earthing are not met by a functional earthing terminal or

337 functional earthing conductor, it shall not be marked with an identification of a protective

338 earthing terminal or protective earthing conductor, respectively.

339 – The requirements for functional earthing are to be defined by the manufacturer or the

340 relevant product committee and should be specified within the documentation of the

341 equipment.
342 NOTE For example, requirements for handling EMC issues.
343 6 Identification by colours
344 6.1 General
345 For identification of conductors, only the following colours shall be used:
346 BLACK, BROWN, RED, ORANGE, YELLOW, GREEN, BLUE, VIOLET, GREY, WHITE,
347 PINK, TURQUOISE.
348 NOTE This list of colours is derived from IEC 60757.

349 The identification by colour shall be used at terminations and preferably throughout the length

350 of the conductor either by the colour of the insulation or by colour markers, except for bare

351 conductors where the colour identification shall be at termination and connection points.

352 Identification by colour or marking is not required for
353 – concentric conductors of cables,
354 – metal sheath or armour of cables when used as a protective conductor,
355 – bare conductors where permanent identification is not practicable,
356 – extraneous-conductive-parts used as a protective conductor,
357 – exposed-conductive-parts used as a protective conductor.

358 Additional markings, for example alphanumerical, are allowed, provided that the colour

359 identification remains unambiguous.

360 Where conductors shall be identified by colours, the requirements of 6.2 and 6.3 applies.

361 6.2 Use of single colours
362 6.2.1 The use of the single colours GREEN and YELLOW

363 The single colours GREEN and YELLOW shall only be used where confusion with the

364 colouring of the conductors in accordance with 6.3.2 to 6.3.6 is not likely to occur.

365 6.2.2 Neutral or mid-point conductor

366 A neutral or mid-point conductor shall be identified by the colour BLUE. In order to avoid

367 confusion with other colours it is recommended to use an unsaturated colour BLUE, often

368 called "light blue".

369 Where a neutral or mid-point conductor is present, the colour BLUE shall not be used for

370 identifying any other conductor. In the absence of a neutral or mid-point conductor within the

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371 whole wiring system, the colour BLUE may be used for identifying a conductor with any other

372 purpose, except as a protective conductor.

373 Bare conductors used as neutral or mid-point conductors shall be either coloured by a BLUE

374 stripe, 15 mm to 100 mm wide in each unit or enclosure and at each accessible position, or

375 coloured BLUE throughout their length.

376 NOTE In IEC 60079-11, the colour BLUE is used for the marking by colour of terminals, terminal boxes, plugs and

377 s
...

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