I'm doing all the prep work for my new boiler - ie I am drilling holes, running pipes and cables etc but not connecting/soldering etc anything as I want to make sure it is done properly and to all the regs.
So just after some advice as wanted to see if an idea is viable before I call an electrician and get some funny looks.
Long story cut short(ish) - I have a switched fuses supply from the old boiler that terminates in the cupboard where all the pipes are. I am already cutting trenches for the new pipe work so can I cut a separate trench and run an SWA cable in the floor? Floor is concrete/screed.
Floor covering is going to be hardboard stuff and then laminate (unfortunately but it is a decent one and I'm renting it out) so no fixings will be going into the floor. I wasnt planning on re-screeding around the pipes or cable and just capping off the trenches with wood so new pipe/cable can be routed easily if required.
Is SWA going to be okay for this and is there a minimum depth baring in mind it's not going to be re-screeded and just capped and labelled for anyone who takes the floor up?
Also the boiler states 3A fuse and 0.75mm flex. The current cable is 3+earth and smaller than normal socket flex so I am assuming its 1.5mm. Is this okay to connect 1.5mm SWA to this and what do I do with the 3rd yellow insulated cable that was used for switching the back boiler on? Can this just be earthed at both ends?
correction - will the electrician just earth this both ends or do I need to prepare to run a new cable?


