2 x Ovens and a hob - can anyone help?

[Tattyt]

Hi,

I have had an electrician out to look at at what needs to be done to install two new ovens and a new hob.

Existing: 6mm cable which was used for a double oven & hob previously, with one isolating switch. 40A breaker (think it should be 32A)

Two new ovens: Neff 2 x 2.99KW 13A
New hob: 6.5 KW

I just want to confirm that his recommendations are correct as it involves running some new cables so carpet, floor boards up etc etc.

If anyone could advise that would be brilliant

 

[SparkyChick]

Hi,

I have had an electrician out to look at at what needs to be done to install two new ovens and a new hob.

Existing: 6mm cable which was used for a double oven & hob previously, with one isolating switch. 40A breaker (think it should be 32A)

Two new ovens: Neff 2 x 2.99KW 13A
New hob: 6.5 KW

I just want to confirm that his recommendations are correct as it involves running some new cables so carpet, floor boards up etc etc.

If anyone could advise that would be brilliant

Hi, welcome to the forums.

What has he recommended?

 

[telectrix]

you have a total load of 9.5kW. a 6.0mm cable on a 32A MCB can cope with 15kW, once you allow for diversity. running new/additional cables is just a waste of money.

 

[Tattyt]

Hi SparkyChick,

Thanks for a prompt reply.

To run two new 2.5 cables, 2 x new 20 amp breakers with two new isolation switches.

Regards, Tattyt

 

[Tattyt]

you have a total load of 9.5kW. a 6.0mm cable on a 32A MCB can cope with 15kW, once you allow for diversity. running new/additional cables is just a waste of money.

Would it not be 12.5kW in total? as its for 2 x new ovens (3KW each)

Regards, Tattyt

 

[telectrix]

Hi SparkyChick,

Thanks for a prompt reply.

To run two new 2.5 cables, 2 x new 20 amp breakers with two new isolation switches.

Regards, Tattyt

crazy. unless the appliances are in separate areas. and depending on installation methods, 2.5mm may not be up to it.

 

[SparkyChick]

I'm inclined to agree with @telectrix .

I'm guessing those two cables are for the two ovens... it's interesting that 20A breakers are specified for a 13A load (when 16A breakers are available)

 

[SparkyChick]

How far from the consumer unit are these appliances?

 

[Tattyt]

How far from the consumer unit are these appliances?

They are approx 4 metres from the consumer unit but I have no idea the path of the cables.

The ovens are on top of each other and the hob is about 35cm away from them.

 

[telectrix]

They are approx 4 metres from the consumer unit but I have no idea the path of the cables.

The ovens are on top of each other and the hob is about 350 away from them.

350 what? miles, yards, poles, furlongs?

 

[Tattyt]

350 what? miles, yards, poles, furlongs?

Apologies, I have corrected it to read 35cm.

 

[telectrix]

that's just over 1 foot. no reason not to feed all 2 ovens and the hob from existing 6.0mm (32A MCB/RCBO) via a 45A isolator and a dual connection unit. from the dual connection unit, feed hob in 4.0mm or 6.omm and each oven in 2.5mm (fixed loads do not require overcurrent protection for the 2.5mm).

 

[Octopus]

If you were having a rewire or refit I would recommend a 2nd supply ....

But as others have said your existing set up could be adapted .....

 

[Tattyt]

If you were having a rewire or refit I would recommend a 2nd supply ....

But as others have said your existing set up could be adapted .....

Thanks Murdoch, no rewire or refit so new cable(s) would require a lot of work and stress!. If it does need to be done then so be it but it would appear not by the replies I have had.

 

[robd]

I agree with above on face value. If it's in the onsite guide (as was) it's good enough for me...6mm cable 32a MCB up to 15kw...unless there's something else he is thinking of.

Edit..for cooker circuits obviously not showers