Urgent help with cooker instalation

[m10wew]

Due to move into a new place but currently have electricians doing some work . We have had a new cooker delivered and asked the electrician to fit it so it's all under the electrical cert .

House has 6mm cable on a 32amp fuse from the fuse box to the cooker switch and the distance is less than 6m.

The cooker is a freestanding 10kw(max load ) 32 amp cooker . Manufacturer states a min 4mm cable to be used .model number of cooker is beko XDC663sm.

This electrician has seen its a 10kw cooker and straight away said the cooker circuit needs rewiring to 10mm cable and 40amp fuse.

Spoke to other electricians who have said due to diversity ( no idea what that is ) the existing cooker circuit is more than adequate especially as the cooker control switch IS NOT over 20m away from consumer unit .

Any advice and thoughts would be apreciated.

 

[pete01]

The existing 32 amp 6mm circuit is ample for the 10kw.

 

[Murdochcat]

The existing circuit is perfect for the proposed oven.

And it’s a bit worrying that the spark you have doesn’t understand diversity

 

[flameport]

This electrician has seen its a 10kw cooker and straight away said the cooker circuit needs rewiring to 10mm cable and 40amp fuse.

Find someone else.
The standard 32A circuits is perfectly fine for the cooker.
The only wire needed is a length of 4mm² HO7 flex between the outlet plate and the cooker.

 

[m10wew]

Thanks for replies .. im sure the electrician does no diversity, I ment I don't no what it is lol ..

So basically the current electrician is just trying to get more work suggesting we need the 10mm rewire when he should no perfectly well the current 6mm 32amp circuit is sufficient.

 

[pete01]

No he thinks you need a 10mm and probably thinks diversity is a dance group lol.

 

[m10wew]

Can someone explain diversity to me in simple terms as I'm not an electrician and how is it applicable here ?

 

[SFK]

Diversity means that the oven because of its thermostats never needs its full rated power (current) all the time.

The oven and hobs turn off for a while (use no current) when they reach their selected temperature.

So on average in use the oven needs less power than is stated as a maximum on the label.

And even if you were to switch on everything on the oven at the start (from cold), the 6mm2 cable and fuse can cope with this initial high power draw for a while until the oven/hobs reach temperature and the thermostats start working switching them on and off to maintain their selected temperatures.

Sfk

 

[SFK]

Also, your whole house also has diversity.

For example...

You are unlikely to say switch on at exactly the same time you kettle, toaster, blender, coffee machine, iron, washing machine, tumble drier, dishwasher, etc at the same time.
So this unlikeness means it is okay that they are all connected to the same 'kitchen' circuit and fuse (MCB).
And them all having different start and on times means that have diversity on that circuit.

Sfk

 

[m10wew]

Also, your whole house also has diversity.

For example...

You are unlikely to say switch on at exactly the same time you kettle, toaster, blender, coffee machine, iron, washing machine, tumble drier, dishwasher, etc at the same time.
So this unlikeness means it is okay that they are all connected to the same 'kitchen' circuit and fuse (MCB).

Sfk

Really apreciate you explaining it in simple terms to me im going to have to speak to the electrician tomorrow , then speak with the landlord who found the electrician and raise some concerns.

The electrician wanted over £300 to rewire the cooker circuit to 10mm just to use the cooker we brought. Alarm bells rang .

 

[Murdochcat]

Tell the spark to read appendix A of the OSG

 

[EFLImpudence]

Just to say -

A 32A circuit with 6mm² cable (which is actually larger than necessary) is adequate for any domestic cooking appliance likely to be purchased.

 

[Adam_151]

Really apreciate you explaining it in simple terms to me im going to have to speak to the electrician tomorrow , then speak with the landlord who found the electrician and raise some concerns.

In case you are interested, the general rule for diversity for cookers is the first 10A, then 30% of anything above that, and add 5A if the cooker switch has a built in socket.

10kw is 10000/230 = 43.48A

Take off 10A and 30% of rest is (43.48-10)*0.3 = 33.48*0.3 = 10.04A

10A plus 10.04A from above + 5A assuming you have a socket outlet on the switch is 10+10.04A+5A=25.04A

So in reality a 25A cooker circuit (which would probably only need 4mm given typical domestic installation methods) would be sufficient, so there is no issue with your standard 32A/6mm cooker circuit