New 3kw oven connection

[ianphilip007]

hello there

after a little advise, just been to look at a possible 3kw oven replacement, as old oven keeps tripping RCD. But there is no dedicated cooker circuit, no cooker switch and no accessable means of isolation for the currently installed oven. The current oven is wired to the downstairs ring main (No Kitchen RFC) and i assume it is spurred via 13 a sfu or plugged into a spurred socket (but cannot be sure as sfu/socket are not even visable let alone accessable.

i have told customer that there should be a dedicated cooker radial circuit and that a suitable isolater switch should be fitted to allow safe isolation in case of fire/emergency. also advised reguards overloading of the downstairs ring main.

Now i feel that my advice and decision to not install new oven to existing circuit is in line with regulations,safe and electrically sound

but i have read that some electricians will connect a single oven <3kw to an existing RFC and dont see the need for a dedicated radial, or becuase its below 3kw local accessaable isolation.


any thoughts please ?

 

[Amp David]

Think the max advised for connection to the RFC is 2KW max.

Radial everytime for me.

 

[telectrix]

ditto^^^^^

 

[Engineer54]

On a well designed and installed FRC, that isn't load stressed, ...I wouldn't think twice about connecting a 2KW load to it!! That so called 3KW oven has i bet a 1.5mm flexible cord and a 13A plug top, which tells me, that the maximum load you can actually draw on that oven, is around 2KW.

I don't know, all this dedicated circuit for this, a dedicated circuit for that, You may just as well install a decent sized FRC ...Far more adaptable and ready for the inevitable future needs

 

[GLENNSPARK]

so is that 3KW...after diversity has been applied...which is what i think eng is driving at here ian?....... as in the 1st 10A....then 30% of owt left....if the cooker switch has a BS 1363 outlet incorparated...then just add 5A......

 

[Engineer54]

so is that 3KW...after diversity has been applied...which is what i think eng is driving at here ian?....... as in the 1st 10A....then 30% of owt left....if the cooker switch has a BS 1363 outlet incorparated...then just add 5A......

Not so much diversity, just that almost all ovens come with a grill, and that grill is a stand alone element, that isn't part of the main ovens operation. So you can eliminate that grill element out of the maximum load demand, normally around 1.25KW or so!!

It's about time that these oven manufactures started stating ''true'' maximum load, and NOT connected loads!!!

 

[GLENNSPARK]

Not so much diversity, just that almost all ovens come with a grill, and that grill is a stand alone element, that isn't part of the main ovens operation. So you can eliminate that grill element out of the maximum load demand, normally around 1.25KW or so!!

It's about time that these oven manufactures started stating ''true'' maximum load, and NOT connected loads!!!

so a way of putting it would be... apparant load...the manufacturers quotation and true load....actual current draw measured by clamp.....

 

[GLENNSPARK]

and yes....its high time manufacturere of such current using equipment were more accurate and candid about the true current draw of their products......

 

[stuart569]

well my oven states 2.1kw and draws 2kw.Cmon everyone go stick your oven on full tilt and see how it compares with stated power!

 

[Engineer54]

well my oven states 2.1kw and draws 2kw.Cmon everyone go stick your oven on full tilt and see how it compares with stated power!

You can't do that at the shop before you buy the thing though, ...can you?? lol!!

If your pulling that current, and it's stated connected load is 2.1 KW then i take it you don't have a grill element. It's either that or your oven's manufacturer is actually giving a ''true'' maximum load... That's a first!! ...lol!!

 

[stuart569]

Its got a grill element.Much and such the same when on grill or fan oven setting.Must be a true max load!
Unusual I agree

 

[Engineer54]

Its got a grill element.Much and such the same when on grill or fan oven setting.Must be a true max load!
Unusual I agree

Never heard of a 1KW fan oven before!! Smallest i've seen in the past was 1.5 or was it 1.75KW!! Grill elements are normally around 1.25KW'ish. So most of these stand alone ovens are around 2.3 KW (No Grill) to 2.75KW

So yes, seems as they are quoting true max loading, ...as i say, that's a First!! lol!!

 

[Jimmyb]

I always put it on own circuit but if it been installed already and is a direct replacement then i would just change it, the 2kw rule is only a recommendation and a very good one at that but if it a case of not getting the job i would as the old has been ok and as long as cables test ok. I would have turned this job down tho because of the isolation and not have access to fcu.

Shame someone from pub will do it lol

 

[stuart569]

I'm confused.Not had much dealings with the guts of fan ovens but I was under the illusion there was a 2kw element for the fan oven and then a grill element at around 2kw also?Hence why the loads are around the same when on either function

 

[GLENNSPARK]

I always put it on own circuit but if it been installed already and is a direct replacement then i would just change it, the 2kw rule is only a recommendation and a very good one at that but if it a case of not getting the job i would as the old has been ok and as long as cables test ok. I would have turned this job down tho because of the isolation and not have access to fcu.

Shame someone from pub will do it lol

offer to do the job on the proviso that its done correctly....show them the non compliance issues with it all and offer to sort it out for them properly for a price of course....i wouldn`t just walk off just because a means of isolation wasn`t present.....