Please get in touch with the relevant contact person at DIN if you have problems understanding the content of the standard or need advice on how to apply it.
Uninterruptible power systems (UPS) - Part 1-2: General and safety requirements for UPS used in restricted access locations; German version EN 50091-1-2:1998
Direct acting indicating analogue electrical-measuring instruments and their accessories - Part 1: Definitions and general requirements common to all parts (IEC 60051-1:1997); German version EN 60051-1:1998
Direct acting indicating analogue electrical-measuring instruments and their accessories - Part 1: Definitions and general requirements common to all parts (IEC 60051-1:1984/A1:1994); German version EN 60051-1:1989/A1:1995
Low-voltage electrical installations - Part 5-56: Selection and erection of electrical equipment - Safety services (IEC 60364-5-56:2009, modified); German implementation HD 60364-5-56:2010 + A1:2011