Pipes and fittings of high-density polyethylene (PE-HD) for buried cable ducting – Dimensions and technical delivery conditions
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 08/01/2010

Pipes and fittings of high-density polyethylene (PE-HD) for buried cable ducting – Dimensions and technical delivery condition
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 12/01/2016