Two ovens one supply again

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Tomm

Hi all.

usaul story, first fixed a new build now boarded and skimmed. Customers has now gone to howdens to get the kitchen designed and has decided he wants two ovens. One is a fan oven and the other is an all in one grill, oven and microwave all in one, one is 2.8 kW and the other is 3 kW. I have run a 6 mm cable to a dp switch above the counter then to a outlet plate behind where the single cooker was meant to go. My first thought was just to run another cabe but now it's been skimmed this would be a pita! Not sure weather to run a new cable and keep them on separate mcb's or to use a dual outlet plate and put them both on the same breaker say a 32a. The cookers are on order so iv no manufacturers instructions at the moment but if I decide to run a new cable I will need to do it before the kitchen fitters come in!! What is the norm when having two ovens as all the new builds I have done up to now have either been a stand alone oven and hob in one or a single oven with a gas hob.

thanks
 
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Tomm said:
....... or to use a dual outlet plate and put them both on the same breaker say a 32a.
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^ That is your answer ^

Any appliance above 13a requires its own supply. These are 2.8Kw and 3Kw so no worries there then. 6mm on a 32A MCB for this install is fine. A dual outlet plate would be needed/best or if you really want to be posh, an Iso switch for each cooker?
 
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I despair as to the state of the building industry. Why the hell are plans being drawn after the plasterers have finished? What's the project manager doing to create that royal cockup?
 
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davesparks said:
I despair as to the state of the building industry. Why the hell are plans being drawn after the plasterers have finished? What's the project manager doing to create that royal cockup?
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There re is no project manager, it's a local chap who is building on a piece of land he owns so he is running it himself. So it's a kind of make it up as you go alone sort of build witch is a pita as no plans and constant changes etc. Will go there and move the dual output box before next week, thanks all
 
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When I was an apprentice my mentor would refuse to start any job like this without a set of plans. And that set of plans was never let out of our custody!
 
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davesparks said:
When I was an apprentice my mentor would refuse to start any job like this without a set of plans. And that set of plans was never let out of our custody!
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Dave things have change a lot since then. We have to be electrical Ninja's these days! Always ready to react to the ever changing movements of the client/builders requests. End of the day if they dont have a plan, here is the extras bill for your changes!
 
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You may find that the all in one grill microwave comes with a 13amp socket attached, did one a while ago, Bosch I thing it was.

The Bosch one that Howdens sell seems to, not sure about the other makes
 
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Hmmm, was thinking diversity, but your right of course, looking at the Bosch manual maximum combined load is 2.6kw so it would need to go on the cooker circuit. However, it has a pug attached (with a 16amp fuse apparently!) which manufacturer states must be connected to a socket.
 
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Hard to comment without seeing the manual <link?>
Many ovens etc are made for a wide market, europe incl. Sur le continent a usual circuit to the appliance would be a radial with a 16A breaker on it terminating in a 16A socket (schuko is likely).
Note that there is no fuse in the plug, its only us Brits that do these things………..
 
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Midwest said:
Hmmm, was thinking diversity, but your right of course, looking at the Bosch manual maximum combined load is 2.6kw so it would need to go on the cooker circuit. However, it has a pug attached (with a 16amp fuse apparently!) which manufacturer states must be connected to a socket.
Click to expand...


a pug like these?


is.jpg
 
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Still don't have any manual or anything as customer is still deciding on make and model etc, worst case will have to come from outlet plate to two sockets behind each appliance. Not ideal and will have to check if it conforms as will be doing away with the manufacturers plug but it's all boarded so not ideal to have to change the ring main now
 
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Tomm said:
Still don't have any manual or anything as customer is still deciding on make and model etc, worst case will have to come from outlet plate to two sockets behind each appliance. Not ideal and will have to check if it conforms as will be doing away with the manufacturers plug but it's all boarded so not ideal to have to change the ring main now
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Crikey, what is this house powering to require a ring main?!
 
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Taylortwocities said:
A bit pedantic!:6:

I bet you still say "live" when you should say "line":wink:
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I don't think it's pedantic at all. If people in this industry are qualified and working professionally then they should at least be able to use correct terminology to other professionals. Please refer me to where in BS7671 or any of the guidance notes it refers to a 'ring main' and how the phrase used it the above context is correct?
 
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IT was always called a ring main when I was at college so that's what I and many other sparks call it. It is also labeled as such in 90% of the consumer units I see. I'm sure everyone knows what is meant and I'm sure I'm not the only one to call it that either, besides its less typing than ring final circuit

thanks
 
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Tomm said:
IT was always called a ring main when I was at college so that's what I and many other sparks call it. It is also labeled as such in 90% of the consumer units I see. I'm sure everyone knows what is meant and I'm sure I'm not the only one to call it that either, besides its less typing than ring final circuit

thanks
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It has never been called a ring main as far as the regulations are concerned, it has been called variously a ring circuit, ring final sub-circuit, ring final circuit.

A ring main is a distribution circuit

This is very basic terminology in this trade and anyone working within it should be able to use the correct termimology in written communication for an unknown audience.

Main - distribution circuit (is sub-main is a distribution circuit within an installation installed after the incoming main)
Final - circuit which serves a point(s) of utilisation of energy.
 
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I'm fairly sure most of us will use terminology that isn't exactly 100% technically spot on in this trade from time to time.
For example I would always say 'earth wire' in a relevant discussion with a customer rather than 'CPC', just to make things easier for them to understand . I can't help wondering if some on here are a little over eager to criticise just for the sake of it.:rolleyes2:
 
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Dave OCD said:
I'm fairly sure most of us will use terminology that isn't exactly 100% technically spot on in this trade from time to time.
For example I would always say 'earth wire' in a relevant discussion with a customer rather than 'CPC', just to make things easier for them to understand . I can't help wondering if some on here are a little over eager to criticise just for the sake of it.:rolleyes2:
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Yes, but in written communication where you are seeking advice from a group of technically minded people you should use the correct terminology
 
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Dave OCD said:
Fair enough but regardless of that we all know what he meant.
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We did, and the possibility of the error causing a problem in this situation is minimal.
But what about the person who says main earth when they mean main bond, resistance when they mean impedance, RCBO when they mean RCCB?
It suggests a fundamental lack of knowledge and will discourage helpful replies
 
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