5.9kw oven and 5.9kw hob wiring help

[knowalittle]

I am just about to install the above items but just wanted to check on the wiring requirement. Have checked previous threads and the diversity rule may come in handy but don't want cold turkey on xmas day.

Both items will be installed within 1 metre of each other. They are box approx 4m from consumer unit.

I don't really have a spare mcb so can i do the following

run 10mm from 32a on Cu to 45a DP switch and then from here run 4 or 6mm to each appliance?

Am I correct or have I over/under done cable and/or MCB choices?
Ta very much

 

[adwt2004]

As far as i know, an electric cooker and any other high drain device such as electric shower need to have a direct connection to the cu on their own mcb. 32amp mcb's are normally used for the socket ring. is that what you are using? Bad idea..

I'm no electric expert so take my advice with a "pinch of salt". I'd get an electrician to do this, for the sake of £100 it's better than doing this unsafely. This work cannot be diy anyway in a kitchen. Has to be done by a qualified sparky.

 

[IJWS15]

Surely - Can be diy - MUST be notified to BC.

 

[knowalittle]

Are there any qualified sparks out their to give me detailed info?
Much appreciated.

 

[securespark]

As far as i know, an electric cooker and any other high drain device such as electric shower need to have a direct connection to the cu on their own mcb. 32amp mcb's are normally used for the socket ring. is that what you are using? Bad idea..

Not according to the "laws" of diversity it isn't, providing your cable can carry in XS of 32A.

This has been done to death. Use search for keywords "diversity" & "cooker" and put me in the author box, ticking posts, not topics.

Bottom of P2.

 

[adwt2004]

[/quote]Not according to the "laws" of diversity it isn't, providing your cable can carry in XS of 32A.[/quote]

Well the total load is about 52 amps. A 45amp mcb fuse and suitable cable I could understand, very unlikely to trip it but 32amp... I know the full load may not be ever reached but what if it is? It would in my moms house!

 

[securespark]

Did you look up the diversity calcs?

 

[adwt2004]

Did you look up the diversity calcs?

I wouldn't apply diversity calcs to an oven/hob. What if i use all of it at once at full power?

 

[securespark]

Err, what do you think happens?

 

[securespark]

Well the total load is about 52 amps. A 45amp mcb fuse and suitable cable I could understand, very unlikely to trip

I wouldn't apply diversity calcs to an oven/hob. What if i use all of it at once at full power?

if you do use all of it at once at full power, then it will trip a 45A MCB as well as a 32A one.

Using diversity means the current comes out at 22.39 (+5A if you have a CCU).

This means that you can use an existing cable (providing it's CCC >32A), and the circuit will be safe. If it is overloaded, the MCB will trip. But diversity allows for the cooker not being fully loaded.

I'm not saying it is an ideal situation, but if it is not desired to rewire, then an existing circuit can be utilised in this manner.

If you want to utilise flc, then a 32A circuit for each would be in order. To run both from the 10mm² is impractical. For one thing, you'll need a 63A breaker & equally rated accessories. 10 milli on Method 1 is rated from memory at around 63A?

I would run two circuits if you think both appliances will be often fully loaded. If not, use diversity.

 

[knowalittle]

Thanks for all the input guys.

Have gone wth 2 circuits to save face on xmas day. Have run both in 6mm and each have their own 45a cooker swicthes (with socket) and then on to cooker plates ready for load.

What mcb's should I use on the board?

 

[securespark]

If you want to utilise flc, then a 32A circuit for each would be in order.

 

[knowalittle]

Cheers securespark, nice one.

 

[securespark]

If you have decided to bite the bullet & install new circuits, you may want to consider futureproofing the installation by installing a larger cable size protected by suitable breakers.