What size shower??
- Thread starter camerart
- Start date
According to Triton, up to 9.5kW at 240V. Their rating plates give nominal power consumption at 230 and 240V. The 9.5kW figure is for 240V, the same shower is rated 8.7kW at 230V. (though I note that whilst 240x40=9600, 230x40=9200)
http://www.tritonshowers.co.uk/media/custom/upload/File-1439285024.pdf
http://www.tritonshowers.co.uk/media/custom/upload/File-1439285024.pdf
Yes but if the voltage drops the current will drop too so 230/240x40 * 230=8816. Still not quie right though.
Ah, yes - but the element will have a lower resistance as it will be at a slightly lower temperature, so the current will not drop linearly with the applied voltage, it will be slightly "above the line", which should account for the difference.
What size cable runs from the breaker and how is it installed?
Yes you are wrong. Read up on Ohms law.
I might be wrong, but I would doubt that any small difference in the temperature of the element would be enough to anything like explain the differences mentioned.
Kind Regards, John
The figures will be given for cold, in the box, values - makes them seem more powerful.
The current will be less when in use.
The current will be less when in use.
I suppose that's possible - but goodness knows what figures we would have been looking at if they'd adopted that same practice with incandescent lamps/bulbs!
Kind Regards, John
They didn't.
I know, but I suppose they could have done "to make them seem more powerful". Why do you think that they do that with showers, but never did it with lamps/bulbs?
If you're right, would there not be a "Trading Standards issue" - since it seems reasonable to expect the quoted power to relate to the situation when the product is 'in normal use', not the situation when it was 'just out of the box' and cold?
Pragmatically, if we just regard the specified figures as 'approximate', there's probably not much to worry about.
Kind Regards, John
I do not know the actual answer but would imagine they have to quote the maximum.
If you were to buy a shower which stated it was 10kW at 240V and you measured it to find it started at 11kW (or whatever) you may have cause for complaint.
Or they would have to quote 9kW at 240V at 200°C.
Presumably they may check the elements at manufacture to be ~5.76Ω cold.
The same, I suppose, with oven elements.
If you were to buy a shower which stated it was 10kW at 240V and you measured it to find it started at 11kW (or whatever) you may have cause for complaint.
Or they would have to quote 9kW at 240V at 200°C.
Presumably they may check the elements at manufacture to be ~5.76Ω cold.
The same, I suppose, with oven elements.
As I've said, I would think that the (IMO reasonable) expectation is that the 'power' of any energy-converting product should be quoted 'under normal operating conditions'. If, as with motors, the brief 'start up' power consumption might be very different, that figure can (probably should) also be quoted.
I imagine they probably do, but it should not be beyond their mathematical capabilities to extrapolate from that to what power will be consumed at a specified 'normal operating temperature'.
Indeed, and many other things - and, in all cases, I would expect/hope to be told what power they would consume under 'normal operating conditions', not during the first few seconds (or whatever) after they had been switched on. It's not restricted to electrical things, either - for example, the fuel consumption of a car is much higher until the engine gets up to 'normal operating temperature'.
Kind Regards, John
Perhaps we have to do the converse with these products.
Nor ours ??? although I do not know the figures for the element material. Perhaps it's not that much.
...and all cars do 0 mpg at the lights although some use a lot more fuel.
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