i am wanting to run a new cable from my fuse box to the cooker wall switch as the old one is broken, i am wanting to run it around the top part of the wall in pvc trunking from checking the distance etc i will need to use 6mm cable can someone tell me what size trunking i would need i am looking at this site to purchase it from http://www.tlc-direct.co.uk/Main_Index/Trunking_Pvc_Index/index.html , i will not be connecting the cable myself just running it from the fuse box to the cooker switch and a professional is going to connect it for me