Approved Document R: volume 2: physical infrastructure for high-speed electronic communications networks (from 1 July 2025), file type: PDF, file size: 356 KB
Dogfen Gymeradwy R: cyfrol 2: seilwaith ffisegol ar gyfer rhwydweithiau cyfathrebu electronig cyflym iawn (o 1 Gorffennaf 2025), Saesneg yn unig, math o ffeil: PDF, maint ffeil: 356 KB