Can I run an oven and induction hob off a 32A supply

proterra

I’ve got my 3.5kw oven connected to a 32A mcb and want to add a 7,5kw induction hob onto this. Would it be safe.

pinkshoes

proterra wrote: »

I’ve got my 3.5kw oven connected to a 32A mcb and want to add a 7,5kw induction hob onto this. Would it be safe.

No.

If you run them at the same time you would draw more than 32A, so the induction hob would need its own ring-main.

We did this last summer and had to have our entire (ancient) consumer unit changed to have another “loop” added in!!

Shaun_of_the_Dead

pinkshoes wrote: »

No.

If you run them at the same time you would draw more than 32A, so the induction hob would need its own ring-main.

We did this last summer and had to have our entire (ancient) consumer unit changed to have another “loop” added in!!

The hob may draw more than that on its own.

FreeBear

proterra wrote: »

I’ve got my 3.5kw oven connected to a 32A mcb and want to add a 7,5kw induction hob onto this. Would it be safe.

Depends.
What size is the cable from consumer unit to isolator switch ?
How long is this cable ?
Is the cable buried in an insulated wall or clipped in free air ?

Best to get a qualified electrician to have a look, do the calculations, and advise accordingly.

Risteard

pinkshoes wrote: »

No.

If you run them at the same time you would draw more than 32A, so the induction hob would need its own ring-main.

We did this last summer and had to have our entire (ancient) consumer unit changed to have another “loop” added in!!

Nonsense...

ianto11

Risteard wrote: »

Nonsense...

Why....?
With the potential for max 11Kw's, that's over 45A ? Admittedly the MCB will be undersized rather than oversized, but could cause nuisance tripping of the MCB from overloading ?

Owain_Moneysaver

Probably safe in a domestic setting.

(a) there is the principle of diversity which assumes that not all rings on the hob will be on max at the same time. They will cycle on/off according to head required, as will the oven.
(b) a lot of induction hobs have an installer setting to limit the maximum demand

FreeBear

ianto11 wrote: »

Why....?
With the potential for max 11Kw's, that's over 45A ? Admittedly the MCB will be undersized rather than oversized, but could cause nuisance tripping of the MCB from overloading ?

A type B mcb (most common in domestic consumer units) will not trip immediately until an overload of 3-5 times the rated current is detected. Below this, you can quite easily draw quite a bit of current for an extended period of time.

With a 32A mcb, you could quite easily draw 48A for a minute or more before it trips.

Hermione_Granger

Risteard wrote: »

Nonsense...

As you have previously deemed yourself to be:

probably the most helpful user on this forum.

https://forums.moneysavingexpert.com/showpost.php?p=75418167&postcount=11

then rather than posting a single word response, why not actually take the time to explain why you consider it to be nonsense? because what you have posted above isn't exactly helpful to anyone.

neilmcl

Risteard wrote: »

Nonsense...

If you going to make posts like this then at the very least back it up with the reasons why, otherwise it's just plain rude!

knightstyle

I was amazed by FreeBear's comment and looking at the graphs for type B MCBs I see that it can sustain 1.5 times the rated current for 10 minutes before tripping! So 48amps for 10 minutes!