New Cooker Install Help Needed

[wcavanagh]

I wonder if you can offer some advice. I know I have to have a Part B eng check over the install, and have found one to test, and sign off when I am done, so thats all fab.

I am installing a Rangemaster Induction Cooker, this thing is a beast. They rate the total max power to be 15.8kW.

Now I have two consumer units at the moment. One RCD Protected with an 80A 30mA breaker, this covers only the house lights, boiler, and a few other low power items, including the garden supply.

The 2nd consumer unit has 100A double isolator, and has the house ring mains on, 4 individual rings.

Now I do not have anything high power, like an electric shower. So this cooker is going to be the beast. I was thinking of adding it to the consumer unit with the RCD.

Now looking at calcs, this is 60A + without taking into account diversity.

Am I correct in thinking I should use 10mm cable, and a 50A MCB?

I notice the cooker switch is rated at 45A.

The run from the consumer unit to the oven is 4 meters.

Any help would be great.

Oh the tales to each consumer units are 25mm.

 

[kevindgas]

I know I have to have a Part B eng check

.

think a Fire Safety engineer check might be difficult to arrange

try a Part P one they would be better and more appropriate

 

[Spark123]

Try working it out with diversity.
It is not OK to protect a 45A rated switch with a 50A MCB.
Why not have your Part P electrician do the work for you?

 

[securespark]

Is it all electric?

Have you considered diversity?

 

[RF Lighting]

Ask you electrician.

She will be the one signing it off, so you need to make sure you use cable sizes etc. that she is happy with.

 

[wcavanagh]

Sorry guys,

A misstype of course I ment B. lol,

I read that induction you cant apply diversity. Is this right?

 

[wcavanagh]

Manual is here

http://www.rangemaster.co.uk/SiteImages/Site_311/BigMedia/Toledo90Electric_09_04.pdf

They don't spec what MCB to use.

 

[wcavanagh]

Ask you electrician.

She will be the one signing it off, so you need to make sure you use cable sizes etc. that she is happy with.

I cant get hold of him tonight. I am going shopping at 7am tomorrow. Forgot to call him today got caught up tiling the floor. The fun never ends.


So 45A MCB with 45A Cooker Switch and 10mm cable.

I cant find a cooker switch rated any more than 45.

 

[securespark]

Crabtree 4500?

 

[wcavanagh]

Crabtree 4500?

Oooo 50A

Now just to work out what rating the MCB should be.

 

[securespark]

Indeedy!

 

[wcavanagh]

Just got hold on the manufacture. They have confirmed 45A MCB to be RCD protected and 10mm Cable.

Cheers all

 

[ban-all-sheds]

I wonder if you can offer some advice. I know I have to have a Part B eng check over the install, and have found one to test, and sign off when I am done, so thats all fab.

So you've found a registered electrician who is prepared to let you design and install a circuit and then falsify certificates and lie on official forms to say that he did it all?

Don't leave him unsupervised for a second - he's utterly dishonest, so who knows what he might do given half a chance.

 

[wcavanagh]

Sorry I think you miss understand. I am buying the stuff, pulling the cable though the trunking, that is all still fully visable, then he is connecting and testing, then signing. I needed to get the right parts today, ready for him.