New oven

[spongebob2509]

Good Afternoon

We are considering replacing our current gas cooker with an electric one, We know a gas engineer that has offered to remove the gas one and make safe the connection etc.

We will be using an qualified person for the electric connections, but just wanted to check what we currently have will work for the oven we are looking at or does it need upgrading/ or pick an other oven, if it does need upgrading we need to get housing group permission etc so wanted to check before going ahead.

The oven we are looking at is a 9.6-10.4 KW double oven by hotpoint. The breaker in the box says 32MA on it but the list on the box says the cooker circuit is rated for 40amps. Having looked at the manual for the oven online it says to use a 6mm2 cable.

Do you think that cable and breaker will be okay ? it will go into one of the oven juntion boxes behind the oven, which is in turn fed from a cooker socket on the wall (with the big red isolation switch), which also has 13amp plug connection.

Thanks in advance

 

[PrenticeBoyofDerry]

Standard arrangement for a cooker circuit would be 32A on a 6.00 T&E cable.
Using diversity this would normally allow for up to 15kW Appliance.

I would recheck the device labelled 32MA, as that does not sound correct.

 

[spongebob2509]

Thanks for the reply

having just checked the board again the cooker breaker says

B40 32Ma

I am guessing the B40 means a 40amp breaker?

 

[PrenticeBoyofDerry]

Is it a RCBO with a test button and say 40A/30mA?

 

[spongebob2509]

Is it a RCBO with a test button and say 40A/30mA?

It is an RCBO with a test button but only marking on it are

B40/32Ma

The whole house was rewired but the housing group last March

 

[spongebob2509]

Sorry it says

B40 30Ma

sorry for the confusion, posting from work and getting info over the phone from my wife.

 

[PrenticeBoyofDerry]

So you have a B type 40A RCBO. That is fine.

6.00mm2 T&E cable can in ideal circumstances handle 47A.
But be aware that certain methods of installation require the cable to have de-rating factor applied.
So you really need to know what CSA the cable on this breaker is?
http://www.elecsa.co.uk/Technical-L...ting/Current-Carrying-Capacity-of-Cables.aspx

 

[spongebob2509]

Having had a look (back home now)

It what looks to be a 10mm cable (each core is multi-stranded) and runs behind plasterboard a distance of around 4 meters, so if I am reading the link correctly would that make it 57 ?

is it okay to go from 10mm to 6mm via the junction box?

 

[EFLImpudence]

It probably says 30mA (not 30Ma), doesn't it?

There is a difference.

 

[spongebob2509]

yeh it is 30mA sorry that was my fault.

 

[PrenticeBoyofDerry]

Having had a look (back home now)

It what looks to be a 10mm cable (each core is multi-stranded) and runs behind plasterboard a distance of around 4 meters, so if I am reading the link correctly would that make it 57 ?

is it okay to go from 10mm to 6mm via the junction box?

Stranded cable can be 4.00mm and upwards, so don't assume 10mm because it is stranded.

It could possibly be printed on the cable sheath the CSA of the cable, not always but sometimes.
With regards to reducing cables CSA at a junction, if you do do this, then I would suggest a certificate is made out and remark accordingly. Junction boxes will require to be accessibly for maintenance, inspection and testing purposes.

I would suggest now is a time to inform the housing association, regarding alterations.

 

[securespark]

10mm² has a stranded cpc (earth) conductor.

 

[spongebob2509]

Thanks everyone for the help and advice.

We have ordered the oven and arranged a sparky to fit it all once it arrives.