Consolidated reprint consisting of IEC 191-2 (1966) and supplements 60191-2A (1967), 60191-2B (1969), 60191-2C (1970), 60191-2D (1971), 60191-2E (1974), 60191-2F (1976), 60191-2G (1978), 60191-2H (1978), 60191-2J (1980), 60191-2K (1981), 60191-2L (1982),