Analogue phone line = thin round cable, white TV Aerial and SKY satellite dish = thick round coaxial cable, white or black Ethernet CAT5 computer connection from modem to wallplate = round 8-wire cable in assorted colours. The 8 wires are arranged into 4 twisted pairs: blue and blue/white, orange and orange/white, green and green/white, brown and brown/white. Lighting = 3 core flat cable (tru-rip) 1.5mm2 cross-sectional area Power sockets = 3 core flat cable (tru-rip) 2.5mm2 cross-sectional area