IEC 60238:2020 pdf download-Edison screw lampholders.
For lampholders according to this standard, the distances for impulse withstand category II are usually applicable. For holders in equipment where a higher degree of availability is expected, distances for impulse withstand category III may be applicable. This information shall be indicated in the manufacturer’s catalogue or the like. Enclosed reinforced insulated lampholders offer an adequate level of protection for use in luminaires where they are accessible in normal use. This information shall be indicated in the manufacturer’s catalogue or the like. For partly reinforced insulated lampholders, sufficient creepage distances and clearances to outer accessible surfaces will require additional protection to some parts of the lampholder by the luminaire design or by use of additional attachment(s) or cover(s). This information shall be indicated in the manufacturer’s catalogue or the like.
Pending gauges for lampholders E5 and E10, the contact-making is checked by means of the corresponding lamps. It is presumed that the manufacturer of the lampholder for the purpose of the test delivers the lamps for which the lampholder is intended. The checking of contact-making is done on lampholders as delivered and after the tests of Clauses 19 and 20.2. For lampholders for use in appliances other than luminaires only: If the fixing means of lampholders are integrated parts of the rim and the lampholder is designed for use with a selected standardized lamp only, parts of the lampholder rim could interfere with the relevant contact-making gauge. In this case, compliance with the requirements for maximum lamp outlines according to IEC 60630 for the lamp indicated in the lampholder manufacturer’s instructions shall be checked. Following this checking, the contact- making gauge shall be applied after those parts of the lampholder interfering with the gauge have been removed.