Replacing built-in oven

gdunbar · 7 Oct 2014

Hello,

Im planning on replacing my old built in oven with a new one. I currently have a ceramic hob (5.8kw) and the current double oven (4.07kw). They are both connected to a junction box behind the kitchen units which is then connected to the standard oven and single plug unit on the wall. This then connects to a 45amp MCB. Im hoping to replace the oven with a Neff which is 4.9kw and to also keep the current hob. Is the 45amp MCB too much or too little for running both the hob and oven? After reading various forums some seem to suggest 32amp is fine and others 45amp. Im just trying to avoid any unexpected problems when I get the oven installed.

Many thanks for your help,

Glyn

deadshort · 7 Oct 2014

Hi, that will not be a problem as long as the connection behind the kitchen unit is suitable to take the two cables. You may require a dual appliance outlet plate .

Hope this helps.

DS

gdunbar · 7 Oct 2014

The cables running from the oven and hob connects to one of these junctions boxes for example:

http://www.screwfix.com/p/30a-3-terminal-heavy-duty-junction-box/73522

which then connects to one of these:

http://www.screwfix.com/p/crabtree-45a-dp-switch-13a-socket-slimline/63376

The grey cables running to the junction box and switch are a good 10mm in size.

deadshort · 7 Oct 2014

Hi,If you google BG nexus 45a dual cooker plate that will be ideal.

Regards,

DS

gdunbar · 7 Oct 2014

Nice one, cheers DS

deadshort · 7 Oct 2014

Ps. this will require a 47mm flush mounted back box.

Regards,

DS

EFLImpudence · 7 Oct 2014

deadshort said:
Ps. this will require a 47mm flush mounted back box.

It does say that in the instructions but I can't think why.

Taylortwocities · 7 Oct 2014

deadshort said:
Ps. this will require a 47mm flush mounted back box.

Regards,

DS

Not it does not.

With the dual appliance connector the connections are actually proud of the wall. The connector needs a bit more clearance as a result.

JohnW2 · 7 Oct 2014

Taylortwocities said:
deadshort said:

Ps. this will require a 47mm flush mounted back box.

Click to expand...

Not it does not. With the dual appliance connector the connections are actually proud of the wall. The connector needs a bit more clearance as a result.

Yes, as EFLI implied, we know that. However, as he also pointed out, the MIs call for a 47mm back box (actually, a minimum of 47mm - do they actually come any deeper?!).

For the next few months, I guess it depends upon people's attitudes to MIs. In this case, I'm very clear as to what my attitude would be

Kind Regards, John

AndyPRK · 7 Oct 2014

Probably a copy and paste from the single connection unit.

I've fitted the click version on a 25mm backbox.

JohnW2 · 7 Oct 2014

AndyPRK said:
Probably a copy and paste from the single connection unit.

Probably - or maybe someone who has being studying the subject of 'minimum bending radius' (of 10mm² cable or conductors) much too deeply

AndyPRK said:
I've fitted the click version on a 25mm backbox.

I can easily believe that. Does any of the 'works' actually protrude significantly into the backbox (whatever depth it may be)?

Kind Regards, John

AndyPRK · 7 Oct 2014

Nope. Non of the works goes into the back box. Its just there to get the supply cable in.

In fact I have been considering fitted one onto a 16mm box, however its a matter of getting the cable into the backbox i'm more concerned with.

JohnW2 · 7 Oct 2014

AndyPRK said:
Nope. Non of the works goes into the back box. Its just there to get the supply cable in. ... In fact I have been considering fitted one onto a 16mm box ...

As I suspected!

Kind Regards, John

securespark · 8 Oct 2014

JohnW2 said:
do they actually come any deeper?

No and yes.

Not as a single box, no.

But you could if you were desperate screw one of these to one, or indeed any depth of box, to get the desired depth:

http://www.ukelectricalsupplies.com/norslo-extension-box-steel-1-gang-35mm.htm

In fact, these extension boxes are available in 16, 25 and 35mm depths and both 1 and 2G sizes.

I'm sure you wouldn't want to, but you could fit these combinations of boxes and extension boxes together to create a wide range of depths up to around 75mm deep:

16, 25, 35, 41, 50, 57, 60, 66, 70, 75, 76mm

JohnW2 · 8 Oct 2014

securespark said:
Not as a single box, no.

That's what I meant, and thought.

securespark said:
But you could if you were desperate screw one of these to one, or indeed any depth of box, to get the desired depth: .... I'm sure you wouldn't want to, but you could fit these combinations of boxes and extension boxes together to create a wide range of depths up to around 75mm deep: 16, 25, 35, 41, 50, 57, 60, 66, 70, 75, 76mm

Yes, I'm familiar with extension boxes - but why a ceiling at 75/76mm? One could surely go on adding extensions 'ad infinitum', couldn't one? Maybe you've invented a new and expensive way to make ducting

Kind Regards, John

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Replacing built-in oven

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