1、3-CONTENTSPage5FOREWORD.PREFACE。5SECTION FIVE:INDICATOR LIGHTSClause1.General.2.Definitions.3.Classification.4.Characteristics.5.Identification.6.Standard conditions of service.7.Standard conditions for construction.8.Tests.13SECTION SIX:STANDARDIZATION OF FIXING HOLE OF SINGLE HOLE MOUNTEDPUSH-BUTT
2、ONS AND INDICATOR LIGHTS1.Scope and object.19192.Classification.193.Mounting of devices.4.Grouping of devices.215INTERNATIONAL ELECTROTECHNICAL COMMISSIONThird supplement to Publication 337-2(1972)Control switches(low-voltage switching devices for control and auxiliary circuits,including contactor r
3、elays)Part 2:Special requirements for specific types of control switchesSection Five:Indicator lightsSection Six:Standardization of fixing hole of single hole mounted push-buttonsand indicator lightsFOREWORD1)The formal decisions or agreements of the IEC on technical matters,prepared by Technical Co
4、mmittees on which all theNational Committees having a special interest therein are represented,express,as nearly as possible,an internationalconsensus of opinion on the subjects dealt with.2)They have the form of recommendation for international use and they are accepted by the National Committees i
5、n thatsense.3)In order to promote international unification,the IEC expresses the wish that all National Committees should adoptthe text of the IEC recommendation for their national rules in so far as national conditions will permit.Any divergencebetween the IEC recommendation and the corresponding
6、national rules should,as far as possible,be clearly indicatedin the latter.PREFACESection Five of this standard has been prepared by Sub-Committee 17B,Low-voltage Switchgear and Controlgear,ofIEC Technical Committee No.17,Switchgear and Controlgear.A first draft was circulated in April 1975 and exam
7、ined in The Hague in September 1975.The draft,Document 17B(CentralOffice)91,was submitted to the National Committees for approval under the Six Months Rule in December 1975.The following countries voted explicitly in favour of publication:AustraliaIsraelSpainBelgiumItalySwedenBulgariaJapanSwitzerlan
8、dCanadaKorea(Democratic PeoplesTurkeyDenmarkRepublic of)Union of Soviet SocialistFinlandNetherlandsRepublicsFrancePolandUnited KingdomGermanySouth Africa(Republic of)YugoslaviaSection Six of this standard has been prepared by Sub-Committee 17B,Low-voltage Switchgear and Controlgear,ofIEC Technical C
9、ommittee No.17,Switchgear and Controlgear.Three successive drafts were respectively circulated in April 1972,February 1974 and July 1974.The second one wasexamined in Paris in February-March 1974 and the third one in The Hague in September 1975.The draft,Document 17B(Central Office)90,was submitted
10、to the National Committees for approval under the Six Months Rule in November 1975.The following countries voted explicitly in favour of publication:AustraliaIsraelSwedenAustriaJapanSwitzerlandBulgariaKorea(Democratic PeoplesTurkeyCanadaRepublic of)Union of Soviet SocialistDenmarkNetherlandsRepublic
11、sFinlandPolandUnited KingdomGermanyRomaniaUnited States of AmericaHungarySpainOther IEC publications quoted in this standard:Publications 50(45):International Electrotechnical Vocabulary-Chapter 45:Lighting.73:Colours of Indicator Lights and Push-buttons.337-1:Control Switches(Low-voltage Switching
12、Devices for Control and Auxiliary Circuits,includingContactor Relays),Part 1:General Requirements.337-2:Part 2:Special Requirements for Specific Types of Control Switches;Section One:Push-buttonsand Related Control Switches.439:Factory-built Assemblies of Low-voltage Switchgear and Controlgear.3.Cla
13、ssificationIndicator lights may be classified by:-the rated electrical power;一the colour;the fixing hole diameter;一the means of connection;-the nature of the current applied and its frequency if any(e.g.lights with built-in transformer);-the type of lamp socket;一etc.4.CharacteristicsRefer to IEC Pub
14、lication 337-1.4.2.1.2 Rated operational voltagesA value of voltage,assigned by the manufacturer,which,in combination with the rated electricalpower of a light,determines its application.In the case of a light with a built-in transformer,the recommended values of the rated secondaryvoltage Una of th
15、e transformer are:6 V,12 V and 24 V.In the case of a light with a built-in voltage-reducing device,the manufacturer shall,in addition,indicate the rated voltage and the rated electrical power of the lamp.4.2.1.3 Rated power of a lightThe maximum lamp power which an indicator light is designed to wit
16、hstand under specifiedconditions.Note.-As the power of the light has an effect on the temperature rise,it may be necessary to limit the power accord-ing to the mounting conditions;the manufacturer of the light may assign two values of rated power(seeClause 8.1):-the rated power of the light for moun
17、ting on a steel plate;-the rated power of the light for mounting in an insulating enclosure.5.IdentificationThe requirements of Clause 5.1 of IEC Publication 337-1 apply except for Items d),e)andf),which are modified in the following manner:d)the rated power of the light(see Clause 4.2.1.3)corresponding to the test conditions of Clause 8.1;e)the rated electrical power(or type number)of the lamp,in the case of a light with a built-involtage-reducing device(see Clause 4.2.1.2).Item f)of IEC Publication 337-1 does not apply.6.Standard conditions of serviceSee Clause 6 of IEC Publication 337-1.
