1.1 This standard ( Part I ) specifies the requirements and tests for lamp-holders with edison thread E14, E27 and E40, designed for connection of lamps only to the supply.
1.2 As far as it reasonably applies, the specification also covers lamp-holders which are, wholly or partly, integral with a luminaire or intended to be built-in into appliances. Independent lampholders, that is, backplate lampholders, not specifically intended for building-in, are also tested as luminaires.
IS 10276 Pt.1-1982 history
1983IS 10276 Pt.1-1982 Edison Spiral Lamp Holder Specification Part I Requirements and Tests