On 20/08/2012 19:23, Tim Watts wrote:
> Owain wrote:
>
>> On Aug 20, 6:54 pm, "ARWadsworth" wrote:
>>> May I assume that you gust want to change an existing vertical cooker
>>> switch to add a much needed socket and there is no chiseling into the
>>> wall allowed?
>>
>> Dual box and separate cooker switch and socket?
>>
>> Not sure if a 'separate' socket is allowed on a cooker circuit, or
>> only as a combined Cooker Control Unit
>>
>> Owain
>
> It would be on a 32A circuit without question - it would be a variation on a
> 32A radial socket circuit - but that may not leave enough for the actual
> cooker circuit.
In the circumstances it would seem entirely reasonable to treat as a
cooker point and apply the same diversity allowance (5A for the socket,
plus 10A of the actual load plus 30% of the remaining load)
> But as the entire thing is protected by a 32A breaker you
> are not going to set anything alight - possibly just get nuisance trips.
Even that is fairly unlikely (and no more so than with a COTS "cooker
point")
> A single socket ona 40-45A circuit would be a very special case. Obviously
> not unreasonable as cooker switches with integral sockets prove.
>
> The question of protection for the spur cable to the socket comes to mind,
> but as the socket is protected from overload downstream by the plug's 13A
> (or less) fuse you coul dmakea reasonable argument for it. Or you could run
> 6mm2 as the spur cable provided the socket terminals are OK with this.
Most of them should be - and in the same double backbox it would seem
simplest to loop the 6mm^2 through. However, even 2.5mm^2 would have
adequate fault protection from a 32A MCB as it does with a spur from a
32A radial or ring.
> OTOH, it could attract all sorts of comments and/or markdowns should you
> need to get a PIR done by a sparky who disagrees with you as you will not be
> able to claim it is a standard circuit...
Well shit happens, only some of it matters ;-)
--
Cheers,
John.
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