how much on 32a

[ETAF]

My plan is now to run cables etc to appropriate positions and have a qualified guy do the connections.

Will they sign it all off for you , if you do that ?

 

[EFLImpudence]

I understand that, but I came across (I think
On AO) a 13A oven, where the advice was hard wired.

Advice - not MIs then.
It would be better not to have an oven or two on the socket circuit but there is no reason not to have a socket or two on the cooker circuit.
Then there is the fact that there will probably be a cooker switch so I would like it to switch all the cooking appliances including a hood but that is just my preference.

In truth, it does not matter a great deal,

Apart from the above.

I suppose.Plug in would be easier as the Sparks can do their thing and leave me to fit the oven.

Up to you.

My plan is now to run cables etc to appropriate positions and have a qualified guy do the connections.
Given the circs, is it fair to think a new CB and 3 radials (I assume that is what he meant) a bit OTT?

Yes, way over the top and unnecessary.

I know that I could go back and talk about it, but I don’t want to waste his time - and I have plenty of time in my hands to do the grunt work.
The main reason for inviting a firm to quote was for a quicker install time to minimise kitchen down time.

Surely fitting one circuit with three single or two dual cooker outlets will be quicker.

 

[ebee]

So the appendix to BS 7671 warns about the problems with ring finals, note we don't have the same problem with radials.

I would hardly classify those as problems Eric! Much of it would similarly apply to Radials too to some degree.

 

[ebee]

And being cheap skates, we wanted to try and get away with using just two RCD's, today we realise that did not really comply

There was an article in Wiring Matters a few years back that seemed to conclude they did comply if just one front end RCD there ditto two RCD.
To me though it was a bit silly and two was better (or could become better than one and one RCBO each circuit was best - but RCDs were still relatively expensive at the time although much cheaper the previous.
In fact nearly all were one RCD - I am a front-ender I will readily admit to!

 

[ebee]

Advice - not MIs then.
It would be better not to have an oven or two on the socket circuit but there is no reason not to have a socket or two on the cooker circuit.
Then there is the fact that there will probably be a cooker switch so I would like it to switch all the cooking appliances including a hood but that is just my preference.


Apart from the above.


Up to you.


Yes, way over the top and unnecessary.


Surely fitting one circuit with three single or two dual cooker outlets will be quicker.

Yup I`m pretty happy with that too.

 

[ebee]

Will they sign it all off for you , if you do that ?

Yes you must ask, they might not agree, I`ve agreed with time served qualified sparks then regretted the hassle but with "ordinary people" the chances of hassle is far greater surely?

 

[EFLImpudence]

Yup I`m pretty happy with that too.

 

[securespark]

In fact nearly all were one RCD - I am a front-ender I will readily admit to!

I have an RCD incomer inherited when we bought the house.

I can count on the fingers of less than one hand the number of times it has tripped in over 26 years and know all the reasons why.
None of them were developing faults as such, they were all cause and effect, like child shoving knife into toaster (Yikes!) and water leaking into under floor void and shorting out junction box.

 

[FiremanT]

You could put the ovens on with the Hob most probably and you will probably also get away with a 32 amp instead of a 40 amp.

The hob alone is 7.2Kw.
Are you saying that based on diversity factors?

 

[pete01]

The hob alone is 7.2Kw.
Are you saying that based on diversity factors?

Yes diversity, the hob works out to roughly 16 amps ish.

 

[EFLImpudence]

Yes diversity, the hob works out to roughly 16 amps ish.

However, it will be less than that when paired with two ovens.

Say the two ovens were each 3.6kW - also 7.2kW.

14.4kW after diversity is 25A; half of which is 12.25A.

 

[pete01]

However, it will be less than that when paired with two ovens.

Say the two ovens were each 3.6kW - also 7.2kW.

14.4kW after diversity is 25A; half of which is 12.25A.

Oh yeah

 

[ebee]

However, it will be less than that when paired with two ovens.

Say the two ovens were each 3.6kW - also 7.2kW.

14.4kW after diversity is 25A; half of which is 12.25A.

YES INDEED.

There is (almost always) no practical difference between a full blown traditional cooking appliance with hob, oven, grill etc all in one unit or with 3 or 4 separate units of the same total wattage and used in a similar fashion (example - a domestic setting with a typical family having a normal domestic life , the usual diversity factor can still be applied to the total possible load,