OP
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If this little lot is fed from a 13 amp supply via fused spur or plug top then I assume these elements are wired in series ...??
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How did you get 17.6ohms for 3kW at 240V?
230V not 240
Well thanks for the info Dave, 240V it is for all calculation from now on.Why use 240V when the element is going to be 3kW at 240V? The power at 230V will be different due to the lower voltage.
230V is a mythical figure which only exists in paper, in the real world everything is still manufactured exactly the same and just has a lower 230V rating put on the label to satisfy the paperwork.
A standard 3kW element will only be 2.75kW at 230V.
Well thanks for the info Dave, 240V it is for all calculation from now on.
Of course as you well know the supply voltage is allowed to be +10%, -6% from 230v (216.2 to 253v range) and does change through out the day as the load shifts.
Shouldn't you calculate the resistance from what voltage the manufacturer says? Ie 3kW at 230V or if it says 3KW at 240V.....last immersion I looked at said 3KW at 230V-240V
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