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Hi, I have been asked to fit a ringmaster cooker and wanted to confirm everything I plan to do is correct. I'm sure it is would just like to double check on here if anyone doesn't mind answering.

The rangemaster cooker draws around 10kw max, which works out at 43A. The manual asks for a 45A double pole switch which is fine.

The run from fuse board to cooker is 10m maximum, under floor boards, so according to my calcs 10mm is sufficient.

There is a separate consumer unit for the shower backed by a 63A RCD and has 2 spare ways. I plan on putting a 50A MCB alongside the 50A MCB for the shower. I will then change to 63A upfront RCD to a 100A.

I will use a 45A double pole cooker switch inside a unit and leave an outgoing cable for the installers to connect into the cooker.

Can somebody please confirm that this is all correct and if anybody has any advice on a better way to do it that would be great.

Thanks a lot in advance.
 
Thanks for the quick reply. I did actuallyforget to check that. I think they were 25 but can't be sure. 16 should be sufficient though right? It is fed straight from RDL block.

Thanks again.
 
Our Rangemaster has a "theoretical" load of 17.7kw.

It is installed to the manufacturers instructions with a 32A MCB and could be on 6mm (we were rewiring so I ran 10mm)
 
Cheers murdoch, what is theoretical load then? If everything was turned up full to the max I am guessing? On the specs it does actually say 32A connection, but asks for 45A connection point. I thought it would be a safe bet to run a 10mm rather than 6mm just so I am covered.

It is still safe to use a 50A MCB rather than a 32A MCB though if I have used 10mm cable right?
 
6mm cable with a 32A MCB is adequate for this cooker,once diversity has been considred.
 
Cheers murdoch, what is theoretical load then? If everything was turned up full to the max I am guessing? On the specs it does actually say 32A connection, but asks for 45A connection point. I thought it would be a safe bet to run a 10mm rather than 6mm just so I am covered.

It is still safe to use a 50A MCB rather than a 32A MCB though if I have used 10mm cable right?

If it asks for a 32A circuit then that's your starting point for your calculations. As said, a 6mm cable will suffice based on your installation method.

I'd like to hear your thoughts as to why the manual asks for a 45A DP switch though :)
 
Ok so I've just looked into diversity which I should have known!

So my total load is 10.56kw.

10560kw / 230 = 45.9A

45.9A - 10 = 35.9A

30 x 35.9 / 100 = 10.7A

+ first 10A = 20.7A

Can somebody confirm this is the correct calculations now? Thanks
 
Ok thanks a lot for the quick reply.

I will still need to upgrade the upfront RCD to a 100A because I have a 32A cooker ciruit and a 50A shower circuit totalling 82A?
 
Because thats the next size up from a 20A double pole switch?

Bingo ! Well traditionally anyway. Certain manufacturers do make available a 32A domestic DP switch these days. I would stick to a 45A in this case though.
 
can anybody confirm I need to swap the upfront RCD as they are quite expensive and if it doesn't need doing I won't do it. I suspect it does. Thanks
 
what's the rating of the existing RCD? bear in mind diversity, and the short duration of load from the shower.
 
The existing RCD is 63a. I have a 50a shower circuit and 32a cooker circuit so 82a in total.

You have also said your diversity calc leaves your oven at 21A and the shower probably pulls no more than 45A for short durations.
That said, are you really worrying about the cost of an extra, possibly more suitable, RCD (max £30 ?) on a job where someone is spending £1.5k -£2k on a cooker ?
 
and the 63A RCD can be kept in your stock for a future job, so everyone's a winner.
 

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