Hi Bexs,You could use 2.5mm2 for all circuits but obviously cost increases and not practical as some of the junction box's will become to bulky.2.5mm2 is ok for the 15amp circuit as well.Cheers

Hi BexsTo answer your questionLight Circuits – 1.5 mm2 – 2 core + EarthSwitch Wire – 1 mm2 – 2 corePower Circuits- 2.5 mm2 – 2 core + EarthI recently done a job for 2 clients who wanted to save on labour charges and ran the cabling themselves under my instruction. But this was agreed to prior them doing it as if they had come after the fact I…[Read more]