IEC 60238:2020 pdf free download – Edison screw lampholders
1 Scope
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 vr.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. lt 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. In 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.
5.6 Lampholders are deemed to comply with this standard if no specimen fails in thecomplete series of tests specified in 5.3.
lf one specimen fails in one test, that test and the preceding ones which may have influencedthe result of that test are repeated on another set of specimens to the number required by 5.3,all of which shall then comply with the repeated tests and with the subsequent tests.Lampholders are deemed not to comply with this standard if there are more failures than one.
NOTE Lampholders with external parts consisting partly of metal and lampholders comprising external parts ofinsulating material with a conductive outer surface,for example a metallized outer shell, are considered as metallampholders (see 13.3). This does not apply to threaded entries and external parts, for example a metal shade ringmounted onto the outside of a lampholder of insulating material, which cannot become live even in the case of aninsulation fault. Metal holders with insulating coverings are considered as metal lampholders (see 10.5).