IEC 60838-1 :2016 pdf download – Miscellaneous lampholders – Part 1: General requirements and tests.
3.1 2 primary circuit circuit which is directly connected to the AC mains supply Note 1 to entry: It includes, for example, the means for connection to the AC mains supply, the primary windings of transformers, motors and other loading devices. 3.1 3 secondary circuit circuit which has no direct connection to a primary circuit and derives its power from a transformer, converter or equivalent isolation device, or from a battery Note 1 to entry: Exception: autotransformers. Although having direct connection to a primary circuit, the tapped part of them is also deemed to be a secondary circuit as defined above. Note 2 to entry: Mains transients in such a circuit are attenuated by the corresponding primary windings. Also inductive ballasts reduce the mains transient voltage height. Therefore, components located after a primary circuit or after an inductive ballast can be suited for an impulse withstand category of one step lower, i.e. for impulse withstand category II. 3.1 4 basic insulation insulation applied to live parts to provide basic protection against electric shock Note 1 to entry: Basic insulation does not necessarily include insulation used exclusively for functional purposes. 3.1 5 supplementary insulation independent insulation applied in addition to basic insulation in order to provide protection against electric shock in the event of a failure of basic insulation 3.1 6 double insulation insulation comprising both basic insulation and supplementary insulation 3.1 7 reinforced insulation single insulation system applied to live parts, which provides a degree of protection against electric shock equivalent to double insulation under the conditions specified Note 1 to entry: The term “insulation system” does not imply that the insulation shall be one homogeneous piece. It may comprise several layers which cannot be tested singly as supplementary or basic insulation.
3.20 polarized lampholder lampholder for building-in, specially designed for asymmetric rated pulse voltages, where the rated ignition voltage (higher rated pulse voltage) is designated to a fixed contact 3.21 single contact ignition voltage ignition voltage which appears on one contact of the lampholder only 3.22 dual contact ignition voltage ignition voltage which is split between the two contacts of the lampholder 4 General requirement Lampholders shall be so designed and constructed that in normal use they function reliably and cause no danger to persons or surroundings. In general, compliance is checked by carrying out all the tests specified. 5 General conditions for tests 5.1 Tests according to this standard are type tests. NOTE 1 The requirements and tolerances permitted by the standard are related to testing of type test sample submitted for that purpose. Compliance of type test sample does not ensure compliance of the whole production of a manufacturer with this safety standard. Conformity of production is the responsibility of the manufacturer and can include routine tests and quality assurance in addition to type testing. NOTE 2 For further information on conformity testing during manufacture see IEC 60061 -4. 5.2 Unless otherwise specified, the tests are made at an ambient temperature of 20 °C ± 5 °C and with the holder in the most unfavourable position for normal use. If a lampholder is declared to accept different lamp fits, it shall comply with the requirements of each of the fits mentioned.
5.4 Lampholders are deemed to comply with this standard if no specimen fails in the complete series of tests specified in 5.3. If one specimen fails in one test, that test and the preceding ones which may have influenced the result of that test are repeated on another set of specimens for 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. The applicant may submit, together with the first set of specimens, the additional set which may be needed in case of failure of one specimen. The testing station shall then, without further request, test the additional specimens and will reject only if a further failure occurs. If the additional set of specimens is not submitted at the same time, a failure of one specimen will entail the rejection. 6 Classification Lampholders are classified as follows. 6.1 According to their installation conditions − unenclosed lampholders; − enclosed lampholders; − partly reinforced insulated lampholders; − enclosed reinforced insulated lampholders. NOTE 1 Where a lampholder is used with a working voltage of 50 % or less of its maximum rating, it can be regarded as equivalent to a reinforced insulated lampholder.