6kw sauna sharing cooker supply is it even a possibility??

[MickSmith5824]

Right this maybe a completely stupid idea....but, guy wants a 6kw pre built sauna in back garden. The fuseboard million miles to back of house so wiring new circuit would be a nightmare. But he does have a cooker supply right near back door of garden. I know it's deemed good practice to have cooker and sauna on own dedicated circuits but if come from cooker switch with adequate sized cable out to rotary switch for sauna and they was never used at same time could this not be a possibility? I have also heard mentioned before that in scenario like this a change over switch might be able to be used? And this would prevent both being used at same time. Could someone explain to me how this would work and how it would be installed. Thanks

 

[buzzlightyear]

Worse case scenario perhaps 5kW cooker. Applying diversity calcs for the cooker/hot tub combo comes out a 48 VAC. That would suggest 50 or 63 amp MCB and 6 guage cable. My 10p worth.

my computer say no, regulation 433.1.204 (iii) any power exceeding 2 kw on the own dedicated radail circuit ,does not include a 6 kw sauna .

 

[Pretty Mouth]

my computer say no, regulation 433.1.204 (iii) any power exceeding 2 kw on the own dedicated radail circuit ,does not include a 6 kw sauna .

Is that from a previous edition of the regs?

 

[buzzlightyear]

Is that from a previous edition of the regs

page 505 BBB.

 

[Ray Pooley]

my computer say no, regulation 433.1.204 (iii) any power exceeding 2 kw on the own dedicated radail circuit ,does not include a 6 kw sauna .

Not sure how to interpret that. Could you be more specific?

 

[buzzlightyear]

Not sure how to interpret that. Could you be more specific?

Not got the BBB then?

 

[radiohead]

my computer say no, regulation 433.1.204 (iii) any power exceeding 2 kw on the own dedicated radail circuit ,does not include a 6 kw sauna .

I do not have the regulation to hand but your interpretation means plugging a 3kw heater into a socket on a ring would be a breach of regulations.
A simple compliant and cheap solution to the OP's question has already been suggested, a 32a 2 pole changeover switch.
Why do some people get their knickers in a twist when something a bit out of the ordinary is suggested?

 

[pc1966]

433.1.204 is talking about ring circuits and there is no "(iii)" as such, but in Appendix 15 where it goes in to more detail it basically says not to hang big fixed loads such as cookers off a ring, and that is where the (iii) note it to be found.

 

[buzzlightyear]

what is saying wiether a ring or a radial it's is a judgment call on the spark to install the correct loading for a item. I can understand if you got a hob and a oven on the circuit then diversity would be applied not a sauna.
each spark that do not apply the regs is a bad one, but not all.

 

[Ray Pooley]

Not got the BBB then?

No. Do the honours and give me a quote.

 

[goasis]

No. Do the honours and give me a quote.

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[Ray Pooley]

Not got the BBB then?

Ok. I have read the image that

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Drum roll.

 

[pc1966]

I don't see anything electrically wrong with a changeover switch for cooker or sauna, but operationally it seems a bizarre thing to do. In many houses I can think of where the oven refuses to work until the clock is set following power-off I can see all sorts of trouble brewing.

So far no word on why a new circuit is not practical though?

 

[Ray Pooley]

I don't see anything electrically wrong with a changeover switch for cooker or sauna, but operationally it seems a bizarre thing to do. In many houses I can think of where the oven refuses to work until the clock is set following power-off I can see all sorts of trouble brewing.

So far no word on why a new circuit is not practical though?

I don't see why it isn't so long as the max load and diversity calcs are redone and any appropriate upgrade requirement they reveal are implemented as a result.

 

[Pretty Mouth]

page 505 BBB.

This is design options for general purpose socket circuits, not really applicable in this case.
[automerge]1586581107[/automerge]
433.1.1
(i) The rated current or current setting of the protective device (In) is not less than the design current (Ib) of the circuit

Unlikely you'll make this circuit comply with this reg

 

[timbobelfast]

Right this maybe a completely stupid idea....but, guy wants a 6kw pre built sauna in back garden. The fuseboard million miles to back of house so wiring new circuit would be a nightmare. But he does have a cooker supply right near back door of garden. I know it's deemed good practice to have cooker and sauna on own dedicated circuits but if come from cooker switch with adequate sized cable out to rotary switch for sauna and they was never used at same time could this not be a possibility? I have also heard mentioned before that in scenario like this a change over switch might be able to be used? And this would prevent both being used at same time. Could someone explain to me how this would work and how it would be installed. Thanks

So the customer spends probably thousands on a hot tub and then wants to skimp on a few hundred quid to get power out to it, LOL!