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Hi,
Hope you're all doing well. I have a customer who needs a 5 core cable to the boiler from the wiring centre. At the moment the feed is coming from a 13a socket in the upstairs cupboard through the programmer into the wiring centre and then 3 and earth under bathroom floor and into the kitchen. In order to get the 4th cable they were using the earth. The plumber has obviously put this back to its original purpose but now there's 1 cable too few - line, neutral, earth, call for heat and call for hot water.
Under the boiler is a fused spur for the cooker hood. Is it possible to use this as the feed for the boiler allowing the line or neutral cable to be used for the call for heat?

I hope this makes sense. Sorry I should have taken pictures but thought of posting here with this "fix" after I left!

Cheers

Paul
 
Is Y plan system boiler. The mains feed for the programmer would still be the 13a socket but the mains feed for the boiler would be the fused spur and not from the wiring Centre. This would also mean that the boiler could be isolated locally, via the sfcu. Yes I'm a sparky.
 
you can work it out from the plan .;) you only need one isolating point for the full system .
[ElectriciansForums.net] Central heating programmer cable 3 and earth
 
Yes, this is a cracking diagram that someone has spent time doing. It really helped the first few times I installed nest etc. My post is to try and avoid ripping up tiled bathroom flooring to get to run a cable. If I can use a supply to the boiler from a sfcu that's right next to it then I seem to have fulfilled all criteria in the diagram without the need for a new cable. I just wanted to check to see if I had missed something important!?
 
Yeah, sorry I thought it would get confusing. So the supply for the programmer would be the 13a plug up in the cupboard. The supply for the boiler in the kitchen would be the fcu. This would then mean that the 3 and earth would no longer be supplying the boiler with power and would only be used for call for heat and call for hot water.
So the line and neutral on the 3 and earth would not be connected in the wiring Centre to line and neutral but instead used for call for heat and call for hot water, plus a spare.
 
So you would need to both unplug the plug from upstairs, and switch off the fused connection unit to fully isolate power from the boiler? I guess you could fit a label saying multiple supplies present but I don't like it.

Is the pump in the boiler?
Is it a combi?
 
Cant you use the current cable as draw wire for the new 5 core? You sort of know what you need to do but are putting it off for an easier option, id just bite the bullet and fit a new cable.
 

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