Hi all
Can anyone tell me what the maximum Kw oven I can connect to a 13 amp supply.

Thanks

Very rough calculation:

Wattage = Volts x Amps

So, wattage = 240 x 13 = 3120 = 3.12 kW

However that doesn't take into consideration things like power factor (which I did 30 years ago on my electrics course and have forgotten all about!), and you would never run the fuse at the full rating, so 3.12 kW is the maximum power you could expect.

However, 230 x 13 = 2.99 kW so that's more likely to be your maximum.

The previous answer of 2.9 kW provided by Lectrician is definitely in the right ball park and I wouldn't choose to disagree with it - all I am doing is providing a rough and ready calculation which may be handy to give you an idea based upon fuse value.

Andrew

[quote author=plugwash  link=1098731535/0#3 date=1098734207]generally power factor is not an issue on heating and lighting (ie its so damn close to 1 it can be neglected)
[/quote]

Yeah, I thought that was probably the case, but I'm relying on very distant memory.

Isn't it motors and the like where power factor comes into play? Something with a large reactive or capacitive load if I remember correctly.

I'd love to do a refresher course for my OND Electrical Engineering - I know when I did all this stuff it was as boring as hell working out phase angles on a slide rule etc, but now I think I'm more inclined to take an interest. And obviously pocket calculators would make a bit of a difference

Andrew

And please remember to correctly identify the voltage range as 230V  

Many items of kit incorporate PF correction to bring the PF close to unity, but resistive loads such as filament lamps and heating elements will not affect the PF to a noticable degree.

Sorry, my answer was abbrupt.  2.9kW is in my head for a 13amp fuse!!

[quote author=supersparky  link=1098731535/0#9 date=1098775899]must use 230v in your calculations hm! [/quote]

I know - to be honest I don't do leccy calcs all that often. When I'm putting plugs on I instinctively know what size is needed.

Anyway, 230v may be the RMS voltage but from what I recall it can vary quite a bit from there (is it +10%, -6%?).

Andrew

[quote author=HandyMac  link=1098731535/0#10 date=1098787129]

I know - to be honest I don't do leccy calcs all that often. When I'm putting plugs on I instinctively know what size is neededAndrew
[/quote]

And that is why your not fired  



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Yes, for now at least, in a few years it will change to ±10%  

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no problem, gas is easier to cook with anyway..