Low-voltage switchgear and controlgear - Part 5-2: Control circuit devices and switching elements - Proximity switches

This part of IEC 60947 applies to inductive and capacitive proximity switches that sense the presence of metallic and/or non-metallic objects, ultrasonic proximity switches that sense the presence of sound reflecting objects, photoelectric proximity switches that sense the presence of objects and non-mechanical magnetic proximity switches that sense the presence of objects with a magnetic field. These proximity switches are self-contained, have semiconductor switching elements(s) and are intended to be connected to circuits, the rated voltage of which does not exceed 250 V 50 Hz/60 Hz a.c. or 300 V d.c. This Standard is not intended to cover proximity switches with analogue outputs. The main changes with respect to the previous edition are as follows:-modification of Table 3;-modifications of voltage dips and voltage interruptions immunity tests, in Table 8;-modification of status of Annex A, now informative.

Niederspannungsschaltgeräte - Teil 5-2: Steuergeräte und Schaltelemente - Näherungsschalter

Appareillage à basse tension - Partie 5-2: Appareils et éléments de commutation pour circuits de commande - Détecteurs de proximité

La présente partie de la CEI 60947 s'applique aux détecteurs de proximité inductifs et capacitifs qui détectent la présence d'objets métalliques et/ou non métalliques, aux détecteurs de proximité ultrasoniques qui détectent la présence d'objets réfléchissants les ultrasons, aux détecteurs de proximité photoélectriques qui détectent la présence d'objets et aux détecteurs de proximité magnétiques non mécaniques qui détectent la présence d'objets avec un champ magnétique. Ces détecteurs de proximité sont des appareils complets, comprennent des éléments de commutation à semi-conducteurs et sont destinés à être connectés à des circuits dont la tension nominale n'excède pas 250 V 50 Hz/60 Hz courant alternatif ou 300 V courant continu. La présente norme n'est pas prévue pour couvrir les détecteurs de proximité analogiques. Par rapport à l'édition précédente, les changements majeurs sont les suivants:-la modification du Tableau 3;-les modifications concernant les essais d'immunité aux creux de tension et aux interruptions de tension, au Tableau 8;-la modification du statut de l'Annexe A, désormais informative.

Nizkonapetostne stikalne in krmilne naprave - 5-2. del: Krmilne naprave in stikalni elementi - Približevalna stikala (IEC 60947-5-2:2007)

Ta del standarda IEC 60947 se uporablja za induktivna in kapacitativna približevalna stikala, ki zaznavajo kovinske in/ali nekovinske predmete, ultrazvočna približevalna stikala, ki zaznavajo predmete, ki odbijajo zvok, fotoelektrična približevalna stikala, ki zaznavajo predmete, in nemehanska magnetna približevalna stikala, ki zaznavajo predmete z
magnetnim poljem. Navedena približevalna stikala so samostojna, imajo polprevodniške stikalne elemente in so namenjena za priključitev v omrežja, katerih naznačena napetost ne presega 250 V 50 Hz/60 Hz izmenične napetosti ali 300 V enosmerne napetosti. Ta standard ne zajema približevalnih stikal z analognimi izhodi. Cilj tega standarda je za približevalna stikala navesti:
– opredelitve;
– razvrstitev;
– lastnosti;
– informacije o proizvodu;
– običajne servisne in montažne pogoje ter pogoje za prevoz;
– konstrukcijske zahteve in zahteve glede zmogljivosti;
– preskuse za preverjanje naznačenih lastnosti.

General Information

Status
Published
Publication Date
19-Dec-2007
Current Stage
6060 - Document made available
Due Date
20-Dec-2007
Completion Date
20-Dec-2007

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SLOVENSKI STANDARD
SIST EN 60947-5-2:2009
01-januar-2009
1DGRPHãþD
SIST EN 60947-5-2:2000
SIST EN 60947-5-2:2000/A1:2000
SIST EN 60947-5-2:2000/A2:2004

Nizkonapetostne stikalne in krmilne naprave - 5-2. del: Krmilne naprave in stikalni

elementi - Približevalna stikala (IEC 60947-5-2:2007)

Low-voltage switchgear and controlgear - Part 5-2: Control circuit devices and switching

elements - Proximity switches (IEC 60947-5-2:2007)
Niederspannungsschaltgeräte - Teil 5-2: Steuergeräte und Schaltelemente -
Näherungsschalter (IEC 60947-5-2:2007)

Appareillage à basse tension - Partie 5-2: Appareils et éléments de commutation pour

circuits de commande - Détecteurs de proximité (CEI 60947-5-2:2007)
Ta slovenski standard je istoveten z: EN 60947-5-2:2007
ICS:
29.130.20 Nizkonapetostne stikalne in Low voltage switchgear and
krmilne naprave controlgear
SIST EN 60947-5-2:2009 en,fr

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

---------------------- Page: 1 ----------------------
SIST EN 60947-5-2:2009
---------------------- Page: 2 ----------------------
SIST EN 60947-5-2:2009
EUROPEAN STANDARD
EN 60947-5-2
NORME EUROPÉENNE
December 2007
EUROPÄISCHE NORM
ICS 29.120.40; 29.130.20 Supersedes EN 60947-5-2:1998 + A1:1999 + A2:2004
English version
Low-voltage switchgear and controlgear -
Part 5-2: Control circuit devices and switching elements -
Proximity switches
(IEC 60947-5-2:2007)
Appareillage à basse tension - Niederspannungsschaltgeräte -
Partie 5-2: Appareils et éléments de Teil 5-2: Steuergeräte
commutation pour circuits de commande - und Schaltelemente -
Détecteurs de proximité Näherungsschalter
(CEI 60947-5-2:2007) (IEC 60947-5-2:2007)

This European Standard was approved by CENELEC on 2007-11-01. CENELEC members are bound to comply

with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard

the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on

application to the Central Secretariat or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other

language made by translation under the responsibility of a CENELEC member into its own language and notified

to the Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the

Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,

Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,

Sweden, Switzerland and the United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Central Secretariat: rue de Stassart 35, B - 1050 Brussels

© 2007 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 60947-5-2:2007 E
---------------------- Page: 3 ----------------------
SIST EN 60947-5-2:2009
EN 60947-5-2:2007 - 2 -
Foreword

The text of document 17B/1570/FDIS, future edition 3 of IEC 60947-5-2, prepared by SC 17B,

Low-voltage switchgear and controlgear, of IEC TC 17, Switchgear and controlgear, was submitted to the

IEC-CENELEC parallel vote and was approved by CENELEC as EN 60947-5-2 on 2007-11-01.

This European Standard supersedes EN 60947-5-2:1998 + A1:1999 + A2:2004.
The main changes with respect to EN 60947-5-2:1998 are as follows:
– modification of Table 3;

– modifications of voltage dips and voltage interruptions immunity tests, in Table 8;

– modification of status of Annex A, now informative.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2008-08-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2010-11-01

This European Standard has been prepared under a mandate given to CENELEC by the European

Commission and the European Free Trade Association and covers essential requirements of

EC Directive 2004/108/EC. See Annex ZZ.
Annexes ZA and ZZ have been added by CENELEC.
__________
Endorsement notice

The text of the International Standard IEC 60947-5-2:2007 was approved by CENELEC as a European

Standard without any modification.
__________
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SIST EN 60947-5-2:2009
- 3 - EN 60947-5-2:2007
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following referenced documents are indispensable for the application of this document. For dated

references, only the edition cited applies. For undated references, the latest edition of the referenced

document (including any amendments) applies.

NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD

applies.
Publication Year Title EN/HD Year
IEC 60050-441 1984 International Electrotechnical Vocabulary - -
A1 2000 (IEV) -
Chapter 441: Switchgear, controlgear and
fuses
IEC 60068-2-6 1995 Environmental testing -

+ corr. March 1995 Part 2: Tests - Test Fc: Vibration (sinusoidal) EN 60068-2-6 1995

IEC 60068-2-14 1984 Environmental testing -
+ A1 1986 Part 2: Tests - Test N: Change of EN 60068-2-14 1999
temperature
IEC 60068-2-27 1987 Basic environmental testing procedures - EN 60068-2-27 1993
Part 2: Tests - Test Ea and guidance: Shock
IEC 60068-2-30 2005 Environmental testing - EN 60068-2-30 2005
Part 2-30: Tests - Test Db: Damp heat, cyclic
(12 h + 12 h cycle)
IEC 60364 Series Low-voltage electrical installations HD 384 Series
(mod) HD 60364
IEC 60446 2007 Basic and safety principles for man-machine EN 60446 2007
interface, marking and identification -
Identification of conductors by colours or
alphanumerics
IEC 60947-1 2007 Low-voltage switchgear and controlgear - EN 60947-1 2007
Part 1: General rules
IEC 61000-3-2 2005 Electromagnetic compatibility (EMC) - EN 61000-3-2 2006
Part 3-2: Limits - Limits for harmonic current
emissions (equipment input current ≤ 16 A
per phase)
IEC 61000-3-3 1994 Electromagnetic compatibility (EMC) - EN 61000-3-3 1995
Part 3-3: Limits - Limitation of voltage + corr. July 1997
A1 2001 changes, voltage fluctuations and flicker in A1 2001
A2 2005 public low-voltage supply systems, for A2 2005
equipment with rated current ≤ 16 A per
phase and not subject to conditional
connection
IEC 61000-4-2 1995 Electromagnetic compatibility (EMC) - EN 61000-4-2 1995
A1 1998 Part 4-2: Testing and measurement A1 1998
A2 2000 techniques - Electrostatic discharge immunity A2 2001
test
---------------------- Page: 5 ----------------------
SIST EN 60947-5-2:2009
EN 60947-5-2:2007 - 4 -
Publication Year Title EN/HD Year
IEC 61000-4-3 2006 Electromagnetic compatibility (EMC) - EN 61000-4-3 2006
Part 4-3: Testing and measurement
techniques - Radiated, radio-frequency,
electromagnetic field immunity test
IEC 61000-4-4 2004 Electromagnetic compatibility (EMC) - EN 61000-4-4 2004
Part 4-4: Testing and measurement
techniques - Electrical fast transient/burst
immunity test
IEC 61000-4-6 2003 Electromagnetic compatibility (EMC) -
+ A1 2004 Part 4-6: Testing and measurement
+ A2 2006 techniques - Immunity to conducted EN 61000-4-6 2007
disturbances, induced by radio-frequency + corr. August 2007
fields
IEC 61000-4-8 1993 Electromagnetic compatibility (EMC) - EN 61000-4-8 1993
A1 2000 Part 4-8: Testing and measurement A1 2001
techniques - Power frequency magnetic field
immunity test
IEC 61000-4-11 2004 Electromagnetic compatibility (EMC) - EN 61000-4-11 2004
Part 4-11: Testing and measurement
techniques - Voltage dips, short interruptions
and voltage variations immunity tests
IEC 61000-4-13 2002 Electromagnetic compatibility (EMC) - EN 61000-4-13 2002
Part 4-13: Testing and measurement
techniques - Harmonics and interharmonics
including mains signalling at a.c. power port,
low frequency immunity tests
IEC 61140 2001 Protection against electric shock - Common EN 61140 2002
A1 (mod) 2004 aspects for installation and equipment A1 2006
CISPR 11 (mod) 2003 Industrial scientific and medical (ISM) radio-
+ A1 (mod) 2004 frequency equipment - Electromagnetic EN 55011 2007
A2 2006 disturbance characteristics - Limits and A2 2007
methods of measurement
ISO 630 1995 Structural steels - Plates, wide flats, bars, - -
A1 2003 sections and profiles
---------------------- Page: 6 ----------------------
SIST EN 60947-5-2:2009
- 5 - EN 60947-5-2:2007
Annex ZZ
(informative)
Coverage of Essential Requirements of EC Directives

This European Standard has been prepared under a mandate given to CENELEC by the European

Commission and the European Free Trade Association and within its scope the standard covers all

relevant essential requirements as given in Article 1 of Annex I of the EC Directive 2004/108/EC.

Compliance with this standard provides one means of conformity with the specified essential

requirements of the Directive concerned.

WARNING: Other requirements and other EC Directives may be applicable to the products falling within

the scope of this standard.
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SIST EN 60947-5-2:2009
---------------------- Page: 8 ----------------------
SIST EN 60947-5-2:2009
IEC 60947-5-2
Edition 3.0 2007-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Low-voltage switchgear and controlgear –
Part 5-2: Control circuit devices and switching elements – Proximity switches
Appareillage à basse tension –
Partie 5-2: Appareils et éléments de commutation pour circuits de commande –
Détecteurs de proximité
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX
ICS 29.120.40; 29.130.20 ISBN 2-8318-9318-6
---------------------- Page: 9 ----------------------
SIST EN 60947-5-2:2009
– 2 – 60947-5-2 © IEC:2007
CONTENTS

FOREWORD...........................................................................................................................6

1 General ............................................................................................................................8

1.1 Scope and object.....................................................................................................8

1.2 Normative references ..............................................................................................8

2 Definitions ......................................................................................................................10

2.1 Basic definitions ....................................................................................................12

2.2 Parts of a proximity switch .....................................................................................13

2.3 Operation of a proximity switch ..............................................................................15

2.4 Switching element characteristics ..........................................................................17

3 Classification ..................................................................................................................20

3.1 Classification according to sensing means .............................................................20

3.2 Classification according to the mechanical installation............................................20

3.3 Classification according to the construction form and size ......................................20

3.4 Classification according to switching element function............................................20

3.5 Classification according to type of output ...............................................................20

3.6 Classification according to method of connection ...................................................20

4 Characteristics................................................................................................................20

4.1 Summary of characteristics....................................................................................20

4.2 Operating conditions..............................................................................................21

4.3 Rated and limiting values for the proximity switch and switching element(s)............23

4.4 Utilization categories for the switching element ......................................................24

5 Product information.........................................................................................................25

5.1 Nature of information – Identificatoin......................................................................25

5.2 Marking .................................................................................................................26

5.3 Instruction for installation, operation and maintenance ...........................................26

6 Normal service, mounting and transport conditions..........................................................26

6.1 Normal service conditions......................................................................................26

6.2 Conditions during transport and storage.................................................................27

6.3 Mounting ...............................................................................................................27

7 Constructional and performance requirements ................................................................27

7.1 Constructional requirements ..................................................................................27

7.2 Performance requirements.....................................................................................30

7.3 Physical dimensions ..............................................................................................40

7.4 Shock and vibration ...............................................................................................40

8 Tests ..............................................................................................................................40

8.1 Kinds of tests.........................................................................................................41

8.2 Compliance with constructional requirements.........................................................41

8.3 Performances ........................................................................................................41

8.4 Testing of operating distances ...............................................................................50

8.5 Testing for the frequency of operating cycles .........................................................54

8.6 Verification of the electromagnetic compatibility .....................................................58

8.7 Test results and test report ....................................................................................59

Annex A (informative) Typical dimensions and operating distances of proximity
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SIST EN 60947-5-2:2009
60947-5-2 © IEC:2007 – 3 –

switches................................................................................................................................

Annex B (normative) Class II proximity switches insulated by encapsulation –

Requirements and tests ........................................................................................................86

Annex C (normative) Additional requirements for proximity switches with integrally

connected cables ..................................................................................................................90

Annex D (normative) Integral connectors for plug-in proximity switches.................................93

Annex E (normative) Additional requirements for proximity switches suitable for use in

strong magnetic fields ...........................................................................................................97

Annex F (informative) Symbols for proximity switches......................................................... 102

Figure 1 – Sensing range and operating range of photoelectric proximity switches (see

7.2.1.3 and 8.4).....................................................................................................................16

Figure 2 – Ultrasonic proximity switch operating distances.....................................................18

Figure 3 – Relationship between operating distances of inductive and capacitive

proximity switches (see 4.2.1, 7.2.1.3 and 8.4.1) ...................................................................22

Figure 4 – Relationship between operating distances of ultrasonic proximity switches

(see 4.2.2, 7.2.1.3 and 8.4.1) ................................................................................................22

Figure 5 – Method of measuring the operating distance (8.3.2.1 and 8.4.1) ............................43

Figure 6 – Test circuit for the verification of time delay before availability (see 7.2.1.7

and 8.3.3.2.1)........................................................................................................................44

Figure 7 – Signal output across load in Figure 6 (see 8.3.3.2.1) .............................................45

Figure 8 – Test circuit for the verification of minimum operational current OFF-state

current, voltage drop and independent snap action (see 8.3.3.2.2, 8.3.3.2.3, 8.3.3.2.4

and 8.3.3.2.5)........................................................................................................................46

Figure 9 – Test circuit for the verification of making and breaking capability (see 8.3.3.5) ......49

Figure 10 – Short-circuit testing (see 8.3.4.2) ........................................................................50

Figure 11 – Testing of the sensing range (see 8.4) ................................................................53

Figure 12 – Methods for measuring the operating frequency of inductive, capacitive and

non-mechanical magnetic proximity switches (if applicable) ...................................................54

Figure 13 – Methods for measuring the operating frequency f, ultrasonic proximity

switch ...................................................................................................................................55

Figure 14 – Output signal of direct current proximity switch during the measurement of

operating frequency f ............................................................................................................55

Figure 15 − Measurement means for turn-on time t and turn-off time t ..............................56

on off

Figure 16 − Turn-on time t measurement.............................................................................57

Figure 17 – Turn-off time t measurement ............................................................................57

off

Figure A.1 (IA) – Dimensions.................................................................................................60

Figure A.2 (IA) – Installation (mounting) ................................................................................62

Figure A.1 (IB) – Dimensions.................................................................................................63

Figure A.2 (IB) – Installation in damping material...................................................................64

Figure A.1 (IC) – Dimensions in millimetres ...........................................................................65

Figure A.1.2 (IC) – Dimensions in millimetres ........................................................................66

Figure A.1.3 (IC) – Dimensions in millimetres ........................................................................66

Figure A.1.4 (IC) – Dimensions in millimetres ........................................................................67

Figure A.2 (IC) – Installation of a I1C proximity switch in damping material ............................68

Figure A.3 (IC) – Installation of I2C35 in damping material.....................................................69

Figure A.1 (ID) – Dimensions ................................................................................................70

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SIST EN 60947-5-2:2009
– 4 – 60947-5-2 © IEC:2007

Figure A.2 (ID) – Installation of I2D in damping material ........................................................71

Figure A.1 (CA) – Dimensions ...............................................................................................72

Figure A.2 (CA) – Installation (mounting) ...............................................................................73

Figure A.1 (CC) a – Dimensions, type C30 in millimetres .......................................................75

Figure A.1 (CC) b – Dimensions, type C40 in millimetres .......................................................76

Figure A.2 (CC) – Installation (mounting)...............................................................................77

Figure A.1 (CD) – Dimensions in millimetres..........................................................................78

Figure A.2 (CD) – Installation (mounting)...............................................................................79

Figure A.1 (UA) – Dimensions ...............................................................................................80

Figure A.1 (UC) – Dimensions of type U3C40 ........................................................................82

Figure A.1 (UD) – Dimensions of type U3D80 in millimetres...................................................84

Figure B.1 – Encapsulated device .........................................................................................87

Figure B.2 – Test device .......................................................................................................89

Figure D.1 – M12 Ø 3-pin integral connector for a.c. proximity switches .................................93

Figure D.2 – M12 Ø 5-pin integral connector for d.c. proximity switches .................................94

Figure D.3 – 8 mm Ø 3-pin integral connector for d.c. proximity switches ...............................94

Figure D.4 – 8 mm Ø 4-pin integral connector for d.c. proximity switches ...............................95

Figure D.5 − M12 ∅ 4-pin integral connector for a.c. proximity switches .................................95

Figure D.6 – M12 ∅ 5-pin integral connector for a.c. proximity switches .................................96

Figure D.7 – M12 ∅ 6-pin integral connector for a.c. proximity switches .................................96

Figure E.1 – Examples of test configuration for verification of the immunity to an

alternating field ................................................................................................................... 100

Figure E.2 – Example of test configuration for verification of the immunity in a constant

magnetic field ..................................................................................................................... 101

Figure F.1 − Examples of symbols for proximity switches ..................................................... 102

Table 1 – Classification of proximity switches ........................................................................19

Table 2 – Utilization categories for switching elements ..........................................................25

Table 3 – Connection and wiring identification .......................................................................29

Table 4 – Verification of making and breaking capacities of switching elements under

normal conditions corresponding to the utilization categories ..............................................35

Table 5 – Verification of making and breaking capacities of switching elements under

abnormal conditions corresponding to the utilization categories ..........................................36

Table 7 − Acceptance criteria ................................................................................................37

Table 8 – Immunity tests .......................................................................................................38

Table 6 – Test voltages .........................................................................................................48

Table A.1 (IA) – Dimensions in millimetres ............................................................................61

Table A.2 (IA) – Rated operating distances in millimetres ......................................................61

Table A.1 (IB) – Dimensions in millimetres ............................................................................63

Table A.2 (IB) – Rated operating distance in millimetres ........................................................64

Table A.2 (IC) – Rated operating distance in millimetres ........................................................67

Table A.1 (ID) – Dimensions in millimetres ............................................................................70

Table A.2 (ID) – Rated operating distances in millimetres ......................................................71

Table A.1 (CA) – Dimensions in millimetres ...........................................................................72

---------------------- Page: 12 ----------------------
SIST EN 60947-5-2:2009
60947-5-2 © IEC:2007 – 5 –

Table A.2 (CA) – Rated operating distances in millimetres .....................................................

Table A.2 (CC) – Rated operational distance in millimetres....................................................76

Table A.1 (UA) – Dimensions in millimetres ...........................................................................80

Table A.2 (UA) – Requirements for sensing range in millimetres ............................................81

Table A.1 (UC) – Requirements for sensing range in millimetres............................................82

Table A.2 (UD) – Requirements for sensing range in millimetres............................................85

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SIST EN 60947-5-2:2009
– 6 – 60947-5-2 © IEC:2007
INTERNATIONAL ELECTROTECHNICAL COMMISSION
___________
LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR –
Part 5-2: Control circuit devices and switching elements –
Proximity switches
FOREWORD

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

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

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

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

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

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

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

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

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

agreement between the two organizations.

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

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

interested IEC National Committees.

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

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

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

misinterpretation by any end user.

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

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

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

the latter.

5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any

equipment declared to be in conformity with an IEC Publication.

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

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

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

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8) Attention is d
...

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