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]

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.

no it can not be done, considering the loading.think about the loading.

 

[MickSmith5824]

no it can not be done, considering the loading.think about the loading.

But 6000 ÷ 230 is 26Amps. If cooker is on a 32 Amp Mcb and cooker is not on at same time as sauna this will not overload the breaker will it?

 

[pc1966]

Is the cooker on an RCD circuit?

Also what sort of distances and what cable is already in place? You need to check the voltage drop even though a change over switch would avoid the risk of cooker and sauna at the same time.

Does the sauna have lights? It might be a risk if someone changes back to use the cooker with folk in there. I'm not seeing this as a terribly good idea.

 

[freddo]

I will also say no this is not a good idea. It is bad practice to design a circuit with fixed loads that exceed the rating of the circuit.

they was never used at same time

You can't rely on a customer to ensure that.

but if come from cooker switch with adequate sized cable

A cooker switch is unlikely to be designed to accommodate 2 cables per terminal.

 

[Lucien Nunes]

Would a shower priority relay do the job? It's rough as far as functionality goes - people wouldn't expect to have two seemingly unrelated things interlocked - but would solve the electrical objections.

 

[MickSmith5824]

Is the cooker on an RCD circuit?

Also what sort of distances and what cable is already in place? You need to check the voltage drop even though a change over switch would avoid the risk of cooker and sauna at the same time.

Does the sauna have lights? It might be a risk if someone changes back to use the cooker with folk in there. I'm not seeing this as a terribly good idea.

The DB is rcd protected mate. The cooker is on 6mm and would say at most 10 metres in length. I would extend this in 4mm in swa to outside waterproof rotary switch. This additional length would be around 5 metres
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Is the cooker on an RCD circuit?
a change over switch would avoid the risk of cooker and sauna at the same time.

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A cooker switch is unlikely to be designed to accommodate 2 cables per terminal.

Yeah very true Freddo ?
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Would a shower priority relay do the job? It's rough as far as functionality goes - people wouldn't expect to have two seemingly unrelated things interlocked - but would solve the electrical objections.

Have you got a link or description of these Lucien and how they could potentially be used. Thanks

 

[SJD]

Where actually is the consumer unit - front of the house? If so, can you not run a new circuit in SWA down the side of the house and in to the front to the CU?

 

[SparkyChick]

Have you got a link or description of these Lucien and how they could potentially be used. Thanks

Google 'shower priority unit' and you'll get relevant information include a YouTube video from David Savery which explains them.

 

[Baddegg]

As above priority switch but I don’t think it’s something I’d want to be involved in....you mentioned 10 mtrs and 5 mtrs is that all the distance is to the consumer unit?...doesn’t seem far are you sure there’s no way to run a dedicated circuit? Outside building etc?

 

[pc1966]

Is there an other reason for not running in a new circuit (e.g. no free slots in CU)?

That would be best solution. A quick search for shower priority units pulls up a few in the £100 region, but its not a great solution as you also have to reset cooker clocks, etc, after every operation, etc.

 

[buzzlightyear]

I don't think it is acceptable doing it. I would be better running a swa or conduit to the rotory switch amd and a new circuit if the customer does not except it move on.

 

[Wilko]

A two pole changeover switch would keep the two loads separate. But I think the whole thing would not be advisable in that it’s an unusual configuration and we can’t rely on the installation not being interfered with down the track ... just my 20p.

 

[Ray Pooley]

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.

 

[pc1966]

Depending on how it is enclosed/insulated 6mm T&E won't be suitable for 48A

But checking and/or replacing with 10mm would allow something like a 50A MCB at the CU if a lack of space is the reason for not running another circuit.

 

[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?