Conduit systems for cable management - Outside diameters of conduits for electrical installations and threads for conduits and fittings (IEC 60423:2007); German version EN 60423:2007— 15 стр.
Drainage and Sewerage Systems for Buildings and Plots of Land; Specifications for the Determination of the Internal Diameters and Nominal Widths of Pipelines— 28 стр.