Safety of Information Technology Equipment, Including Electrical Business Equipment Second Edition; (Amendment 1-1992) (Amendment 2-1993) (CENELEC EN 60950: 1992) (CENELEC EN 60950/A1: 1993) (Amendment 3-1995) (ECMA ECMA TR/63) (AS/NZS 3260: 1993) (Amendment 4-1996)