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Ask The Trades › DIY Forum › Electrical Questions › fused spur for underfloor heating & other stuff?

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fused spur for underfloor heating & other stuff? (Read 15240 times)

Chrissie

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fused spur for underfloor heating & other stuff?
Jun 27^th, 2008, 4:29pm

Hi Guys

I've got 4 double sockets on an existing 32 amp ring main (supplying my lounge & dining room). Can i take a 13 amp fused spur from this to supply power to a wall light, 1600 watt underfloor heating and 3 double sockets in my new conservatory?

(I know I'll need get a competent person to check it under part P, but I want to do all the work myself and want to get it right).

Thanks for any advice. xx.

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sparxxxx

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Re: fused spur for underfloor heating & other stuf
Reply #1 - Jun 27^th, 2008, 6:52pm

Are you sure the underfloor heating will be adequate. 1600w is going to take ages to heat it up, first you have to heat up the floor screed, then you going to lose probably 50% at least of the heat through the glazing.

If it was me, I'd stick a portable fan heater in there, gives instantaneous heat and no building costs. Or extend your central heating and put a radiator in there.

Your proposal seems ok, but speak to your spark before you do any work.

« Last Edit: Jun 27^th, 2008, 6:53pm by sparxxxx »

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RabbitRabbit

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Re: fused spur for underfloor heating & other stuf
Reply #2 - Jun 27^th, 2008, 7:50pm

In theory Chrissie - no.

You need to fuse the wall light at 3/5 amps max, the underfloor heating is marginal but I guess it's OK at 13 amps as by the time anything goes radically wrong the fuse will pop. If you want to take the sockets to conservatory and limit them to a total of 13 amps (plus underfloor heating) then that's also OK.

I would check if 13 amps is OK for the total load in the conservatory though. The underfloor heating at 1.6kW sounds about right (around 8 sq mtrs?).

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RabbitRabbit GDPR opt-out Total Thanks: 0 For This Post: 0	Re: fused spur for underfloor heating & other stuf Reply #3 - Jun 27^th, 2008, 7:59pm Adding welcome as a new member Chrissie.
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Chrissie GDPR opt-out Total Thanks: 0 For This Post: 0	Re: fused spur for underfloor heating & other stuf Reply #4 - Jun 27^th, 2008, 8:34pm Thanks Sparxxx and Rabbitx2 If what I'm suggesting isn't ideal, is it safe/legal and what would be the 'best practice' solution? Thanks xx
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RabbitRabbit

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Re: fused spur for underfloor heating & other stuf
Reply #5 - Jun 27^th, 2008, 8:40pm

Pleasure Chrissie.

It is neither safe nor 'legal'. What I suggest is that you fit a dual back box and fit two FCU's and install one with a 3A fuse and use this to feed to lighting and the second with a 13A fuse and use this to supply the u/f heating and the sockets in the conservatory. Basically, having a 13A fuse protecting the lighting circuit is a no-no I am afraid.

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sparxxxx Full Member Offline Posts: 435 Total Thanks: 0 For This Post: 0	Re: fused spur for underfloor heating & other stuf Reply #6 - Jun 28^th, 2008, 7:36am Sorry, missed the bit about the lighting, go wth the 2 bunnies suggestion.
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CWatters

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Re: fused spur for underfloor heating & other stuf
Reply #7 - Jun 29^th, 2008, 9:15am

Quote:

I know I'll need get a competent person to check it under part P, but I want to do all the work myself and want to get it right.

Best find that person first before you start. As I understand it a competent person isn't meant to sign off DIY work...

For DIY under Part P you're meant to submit a Building Control application (fee). The BCO will check your proposal beforehand and send a competent person to check sign it off afterwards (included in fee). The alternative is to have a competent person do the lot.

« Last Edit: Jun 29^th, 2008, 9:20am by CWatters »

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RabbitRabbit GDPR opt-out Total Thanks: 58 For This Post: 0	Re: fused spur for underfloor heating & other stuf Reply #8 - Jun 29^th, 2008, 9:22am It's marginal that Part P applies. No new circuits, not a special location mentioned
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Chrissie GDPR opt-out Total Thanks: 58 For This Post: 0	Re: fused spur for underfloor heating & other stuf Reply #9 - Jun 29^th, 2008, 9:12pm As I understand it, all underfloor heating, regardless of location, comes under Part P. Yes?
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NickW GDPR opt-out Total Thanks: 58 For This Post: 0	Re: fused spur for underfloor heating & other stuf Reply #10 - Jun 30^th, 2008, 8:31am Underfloor heating counts as a special location and so is under part P control. See Section 753 of the 17th ed.
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Dirty Harry

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Re: fused spur for underfloor heating & other stuf
Reply #11 - Jun 30^th, 2008, 11:22am

Hi all,

I'm new here and not trying to be clever but isn't it the case that all electrical work in a dwelling falls under part p of the building regulation and the question is whether or not the work is notifiable i.e. special location, new circuit etc?
Underfloor heating is special location under the 17th so that would be notifiable.

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RabbitRabbit GDPR opt-out Total Thanks: 58 For This Post: 0	Re: fused spur for underfloor heating & other stuf Reply #12 - Jun 30^th, 2008, 11:32am Agree it is notifiable under Part P. Not all electrical work is notifiable. Example - add a spur or indeed a rng socket off an existing ring in say the lounge and that is NOT notifiable.
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Chrissie GDPR opt-out Total Thanks: 58 For This Post: 0	Re: fused spur for underfloor heating & other stuf Reply #13 - Jun 30^th, 2008, 11:42am Thanks for all those really useful contributions. Keep up the good work.
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Dirty Harry GDPR opt-out Total Thanks: 58 For This Post: 0	Re: fused spur for underfloor heating & other stuf Reply #14 - Jun 30^th, 2008, 11:45am Not all notifiable, but all falls under Part P
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CWatters Super Member Offline "Daddy fick it" says James Posts: 5150 Total Thanks: 58 For This Post: 0 Gender:	Re: fused spur for underfloor heating & other stuf Reply #15 - Jul 1^st, 2008, 12:42pm I believe that's correct although someone will remind us that the regs and the Act aren't the same thing. It's the Act you have to comply with and the Regs provide guidance on how to achieve that. I can't remember what the act says about Part P.
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RabbitRabbit GDPR opt-out Total Thanks: 58 For This Post: 0	Re: fused spur for underfloor heating & other stuf Reply #16 - Jul 1^st, 2008, 6:32pm Hey dude, make my day not Nope not all electrical work come sunder Part P.
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