Subscribe to IEC 60061 Database to access the full and updated content of the series. IEC 60061 Lamp caps and holders together with gauges for the control of interchange ablility and safety consists of four Parts: Part 1: Lamp caps Part 2: Lampholders Part 3: Gauges Part 4: Guidelines and general information Each part is independent of the other, but a given part should always be studied in conjunction with the other parts. This consolidated version of IEC 60061-4 is based on the first edition (1990) and its supplements A(1992), B(1994), C(1994), D(1995) and amendments 5(1998), 6(2000), 7(2001), 8(2003) et 9(2004). It bears the edition number 1.9.