IEC 60238-2020 pdf free download – Edison screw lampholders.
This International Standard applies to lampholders with Edison thread E14,E27 and E40,designed for connection to the supply of lamps and semi-luminaires1 only.
lt also applies to switched-lampholders for use in AC circuits only, where the working voltagedoes not exceed 250 v r.m.s.
This standard also applies to lampholders with Edison thread E5 designed for connection tothe supply mains of series connected lamps,with a working voltage not exceeding 25 V, to beused indoors,and to lampholders with Edison thread E10 designed for connection to thesupply mains of series connected lamps，with a working voltage not exceeding 60 V, to beused indoors or outdoors. It also applies to lampholdersE10 for building-in, for the connectionof single lamps to the supply.These lampholders are not intended for retail sale.
As far as it reasonably applies, this standard also covers lampholders other than lampholderswith Edison thread designed for connection of series-connected lamps to the supply.
NOTE This type of lampholder is for example used in Christmas tree lighting chains.
As far as it reasonably applies, this standard also covers adapters.
This standard also covers lampholders which are,wholly or partly, integral with a luminaire orintended to be built into appliances. lt covers the requirements for the lampholder only.For allother requirements,such as protection against electric shock in the area of the terminals or ofthe lamp cap, the requirements of the relevant appliance standard are observed and testedafter building into the appropriate equipment,when that equipment is tested according to itsown standard.Such lampholders as well as lampholders provided with a snap-on outer shell,for use by luminaire manufacturers only, are not for retail sale.
This standard applies to lampholders to be used indoors or outdoors in residential as well asin industrial lighting installations. It also applies to candle lampholders. ln locations wherespecial conditions prevail, as for street lighting, on board ships, in vehicles and in hazardouslocations， for example where explosions are liable to occur,special constructions may berequired.
This standard does not apply to three-light lampholders E26d.
This standard is based on the following data relative to lamps for general lighting service:
– caps E14 are used for lamps with a current not exceeding 2 A;
– caps E27 are used for lamps with a current not exceeding 4 A;
caps E40 are used for lamps with a current not exceeding 16 A,or 32 A if the nominalvoltage of the supply does not exceed 130 v (see 5.5 and 6.3).
Where lampholders are used in luminaires,their maximum operating temperatures arespecified in IEC 60598.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document andare indispensable for its application.For dated references,only the edition cited applies.Forundated references,the latest edition of the referenced document (including anyamendments ) applies.
IEC 60061-1,Lamp caps and holderstogether with gauges for the control ofinterchangeability and safety – Part 1: Lamp caps
IEC 60061-2, Lamp caps and holders together with gauges for the control ofinterchangeability and safety – Part 2: Lampholders
IEC 60061-3，Lamp caps and holders together with gauges for the control ofinterchangeability and safety – Part 3: Gauges
IEC 60068-2-32:1975,Basic environmental testing procedures – Part 2-32:Tests – Test Ed:Free fall
IEC 60068-2-75:2014,Environmental testing – Part 2-75: Tests – Test Eh:Hammer tests
IEC 60112:2003，Method for the determination of the proof and the comparative trackingindices of solid insulating materials
Amendment 1:2009.IEC 60238 pdf download.