Home |
Search |
Today's Posts |
|
UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
Reply |
|
LinkBack | Thread Tools | Display Modes |
#1
|
|||
|
|||
FCU Wired to Ring Main?
Hello
I've had my underfloor heating installed but not wired in yet. I plan to wire it in where I have removed a double socket, so on the ring main. Do I just wire in a FCU to the old socket cables and then the thermostat from that? I read in some posts that permanently fixed heating devices shouldn't be wired directly to the ring main and if this is true what is the correct way to do this using my existing ring main cables, do I need to use a junction box and spur from this? not sure how this is different though. Help and explanantions appreciated. TIA Cheers Richard |
#2
|
|||
|
|||
|
#3
|
|||
|
|||
|
#4
|
|||
|
|||
Andy Wade wrote: wrote: I've had my underfloor heating installed but not wired in yet. I plan to wire it in where I have removed a double socket, so on the ring main. Do I just wire in a FCU to the old socket cables and then the thermostat from that? Alarm bells loudly ring. What's the scope of the underfloor heating installation and what sort of load are we talking about? I read in some posts that permanently fixed heating devices shouldn't be wired directly to the ring main and if this is true [...] Quite right. Any comprehensive space heating installation needs its own dedicated circuit or circuits from the consumer unit or distribution board. Unless this is something very small and localised it's not at all appropriate to feed it from an existing ring circuit. Underfloor heating comes under the 'special installation' provisions of Part P and requires a Building Notice or installation and sign-off by a member of a competent persons scheme, even if no new circuit is provided. -- Andy Interesting stuff, the installer said it would be fine but I didn't see him analyse what was already on the ring so not sure how he came to this conclusion The room size is 20m2 but the UFH area is probably about 15-16m2 From what I remember and by looking at the wires coming out of the screed there are 2 heaters and I'm pretty sure they are 2KW each. On the existing ring which serves the dining room and the kitchen are the following: Toaster, Dishwasher (spur), Coffee machine, hot tub (connected from a FCU which was spurred from the ring) and a fridge freezer (Spur) kettle is also there but very rarely used. The hob and the oven are on their own circuit of course Thanks for your repsonses. Cheers Richard |
#5
|
|||
|
|||
Actually I was wrong the 2 heaters are about 1KW each, what do other
common applicances I mention in my previous post draw? Thanks richard |
#6
|
|||
|
|||
|
#7
|
|||
|
|||
|
#8
|
|||
|
|||
On Sun, 09 Jan 2005 08:41:46 -0800, r.rain wrote:
Actually I was wrong the 2 heaters are about 1KW each, what do other common applicances I mention in my previous post draw? Thanks richard Listen to Stefek, get someone in WHO KNOWS what they are doing !!. Dave -- For what we are about to balls up may common sense prevent us doing it again in the future!! |
#9
|
|||
|
|||
Richard wrote
| Interesting stuff, the installer said it would be fine but I didn't | see him analyse what was already on the ring so not sure how | he came to this conclusion I'm not sure how he came to any conclusion either. If he's being paid to install it then he should *install* it, not leave half the job undone. If he's not Part P certified then he must subcontract to someone who is. If he hasn't connected it, how do you know what he's installed actually works? Owain |
#10
|
|||
|
|||
Thanks for your advice Stefek.
OK so in summary, I have done some further checking on devices to see what the draw will be Hot Tub = 1.5KW Thermostat controlled and well insualted Toaster = 950W Rarley on Coffee = 1.2KW Rarley on Kettle = 2KW Rarely on UFH (Kitchen) = 2KW F/Freezer = 300W So from my math when all these devices are on (They never will be) the total draw is 7.95 KW = 31.8 AMPS So taking this figure and taking some advice I was given from this forum regarding wiring a cooker and a hob together on the same circuit I should be ok allowing for diversity. Just like to add here that Stefek you stated you wouldn't do this and that I should wire the hob onto a seperate circuit. I'm not stating here that you were wrong simply that some people tend to me more cautious than others, which when dealing with electicity is probably a wise thing to do. Basically in this previous post it was stated that because my cooker and hob would never be on at the same time, meaning all elements, then a 9KW draw would be ok. I actually did put all elements on and the MCB didn't even trip. I didn't however leave these on for an extended period of time though. In addition to this, if it was an easier job than it will be to wire these seperate circuits in as you suggest then I would do it without question. I have floorboards upstairs and the previous occupiers have built units over where the consumer unit is so this will be a hellish job and if I can get away without wiring in seperate circuits then I would like to. Is Owain or Lurch around, I would like a second opinion please, they stated the oven and hob could go on the same circuit which turned out to be correct. However they did talk about cable lengths too so maybe this will come into play in my scenario. BTW the hot tub is protected by a 30MA RCD and the company who installed it are basically the main players in the hot tub market and are not cowboys, also my UFH guy is not a cowboy either he also works for a very reputable company. It makes me laugh that people automatically assume everybody is a cowboy, now ask me about my kitchen fitter, he was a cowboy! Thanks for your contribution Dave. Richard |
#11
|
|||
|
|||
In addition to this, if it was an easier job than it will be to wire
these seperate circuits in as you suggest then I would do it without question. The problem is that it is explicitly forbidden and would fail the inspection. Do it properly and run a new circuit for the UFH. Christian. |
#12
|
|||
|
|||
OK now we are getting there. Which part is explicitly forbidden,
running the UFH from the ring main or the amount of load? If the latter then my cooker and hob together on one circuit (9KW) would fail if the work was done after Part P was introduced and I had to get it inspected. If you are saying the former then I will have some serious words with the installer as I would not of had UFH if I needed a seperate circuit, the only reason I got it was because we needed to get the floor levelled anyway prior to tiling so I thought what the hell. To re-iterate it will be a complete pain in the butt to run a seperate circuit and will involve dismantling a huge cupboard to some degree, that said looking likely I may need to do this now! SWMBO will not be happy its in her dressing room. Sorry to ask all these questions, just want to get everything straight. Cheers Christian Richard |
#13
|
|||
|
|||
|
#14
|
|||
|
|||
On Mon, 10 Jan 2005 10:30:37 -0000, "Christian McArdle"
strung together this: The problem is that it is explicitly forbidden By who, and how exactly? -- SJW Please reply to group or use 'usenet' in email subject |
#15
|
|||
|
|||
"Owain" wrote in message ... Richard wrote | Interesting stuff, the installer said it would be fine but I didn't | see him analyse what was already on the ring so not sure how | he came to this conclusion I'm not sure how he came to any conclusion either. If he's being paid to install it then he should *install* it, not leave half the job undone. If he's not Part P certified then he must subcontract to someone who is. If he hasn't connected it, how do you know what he's installed actually works? Owain Funny that, but that's what I first thought. If he was paid to install it, then why leave the main connection for the householder to do by themselves? Unless he was a floor layer with no electrical experience, or an electrician with no Part P self certification. Weird that. |
#16
|
|||
|
|||
He is coming back after tiling has completed, I was currious and wanted
to make sure what he's doing is correct and I will probably do it myself anyways to make sure its mounted all neat inside a kitchen cupboard. I have monitor boxes on at the moment which are monitoring the integrity of the UFH element just in case I drop a tile on the screed and break something. As for Part P I couldn't really give a hoot about it, as far as I'm concerned the work was done before the regs came in, my house, my problem if it goes South and I will continue to do electrical work. I already paid a BCO guy to come and do nothing when I knocked a wall down and erected a steel structure for an opening, money for old rope, another tax me thinks. As for the UFH company then they obviously need to make sure they are covered in some way but I didn't ask, they may well be. So did you read the complete thread, interested to hear your opinion on what you would do regarding seperate circuit or not? Cheers Richard |
#17
|
|||
|
|||
That was meant for Owain BTW post looks like its got out of order!
|
#18
|
|||
|
|||
Richard wrote
| So did you read the complete thread, interested to hear your opinion | on what you would do regarding seperate circuit or not? | That was meant for Owain BTW post looks like its got out of order! I wouldn't have put electric underfloor heating in in the first place matey :-) If it's *only* 2kW and the other loading on the ring is light and it's a right hassle to put in a separate circuit then I would probably spur it off the ring.[1] But then I wouldn't be doing it as a professional installer with a commensurate duty of care towards a customer. Owain [1] I have done worse things but my excuse is that I was only 13 and not given enough pocket money for proper materials to rewire the bedroom without my parents knowing. |
#19
|
|||
|
|||
"Lurch" wrote
| Is Owain or Lurch around, I would like a second opinion please, | Recognition at last! ;-) There was a Lurch on Scrapheap Challenge last night - was that not you? Owain |
#20
|
|||
|
|||
Owain wrote:
[1] I have done worse things but my excuse is that I was only 13 and not given enough pocket money for proper materials to rewire the bedroom without my parents knowing. Hmm, that sounds familiar... -- Andy |
#21
|
|||
|
|||
On Mon, 10 Jan 2005 21:04:18 -0000, "Owain"
strung together this: There was a Lurch on Scrapheap Challenge last night - was that not you? I dont think so. If it was I've forgotten what I built. -- SJW Please reply to group or use 'usenet' in email subject |
#22
|
|||
|
|||
|
#23
|
|||
|
|||
On looking at the post again you DIDN'T in fact state that, so my
profuse apologies. Having problems telling who said what must do better! Anyway thanks for all the great information you have provided me. In this case I will put it on the ring main but only due to the fact of the MAJOR hassle it would be to put it on a sep circuit, so dont think I'm just ignoring your advice and not answer my future questions I have learn't a hell of a lot just from this thread. I will however plan to do this for the future when we renovate the upstairs. I really didn't need the extra stress of trying to sort wiring out as well as all my other jobs I have on at the moment. I'm in stress city at the moment, I dont think I'll ever buy an old house in need of renovation again. Nearly done downstairs now though and looking sweet............ Thanks again Cheers Richard |
#24
|
|||
|
|||
Well as usual I would just like to thank everyone for all their contributions, you have all been a great help. See response to Stefeks last posting Cheers! Richard |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
boiler / central heating problem - main burner weak and cuts out | UK diy | |||
Non-copper wire in ring main? | UK diy | |||
Is my main socket ring too big? | UK diy | |||
Question regarding adding an extra socket to the ring main | UK diy | |||
extending a ring main | UK diy |