Standardization – Part 11: Presentation of standards concerning safety regulations which are VDE-Specifications or VDE-Guidelines
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 06/01/2014

Standardization – Part 11: Presentation of Standards concerning safety regulations which are VDE-Specifications or VDE-Guidelines
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 01/01/2005