Historical
IEC 60400 Ed. 6.2 b:2004
Lampholders for tubular flurorescent lamps and starterholders
States the technical and dimensional requirements for lampholders for tubular fluorescent lamps and for starter-holders, and the methods of test to be used in determining the safety and the fit of the lamps in the lampholders and the starters in the starterholders.
International Electrotechnical Commission [iec]