O
olsonn
Made the fatal mistake of offering to do a friend a favour which always comes back to bite you. Its a one bedroom flat with concrete floor and ceiling and only one ring final circuit for sockets. Wants panel heaters fitting in the hall 1.25Kw and bathroom 0.75 kw so i said i would run a new circuit to accomodate this using 2.5mm T&E in surface mounting mini trunking. At the same time I was also going to put in another circuit to take the 3Kw immersion heater which currently resides on the socket circuit. I had hoped to run this circuit in the same trunking as the other new circuit using 2.5mm T&E as it is such a bugger to drill through the concrete ceiling but having done a few calculations it looks like if I use the same trunking I would have to up the cable size to at least 4mm (the run is about 12m). Is this correct? Another sparky seems to think that there is a reg which says that cable for an immersion heater has to be in trunking by itself, but I couldn't find this anywhere in the regs