New Heated Towel Rail blows fuse...
- Thread starter Rodtheplod
- Start date
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Why not?
I'm taking it to be open circuit with a reading of '1'
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How can the filament resistance, L to N, reduce to 0.3Ω if, as I think, L to E is open circuit?
Unless they make a noise, all electric heating elements are as efficient as each other - 100% of the energy they consume is turned into heat.
Your element should be 180-200Ω.
L-E is supposed to be open circuit - it makes towel rails a lot safer.
L-N is 0.3Ω because the element is faulty, and the 800-ish amps it draws is popping the fuse and tripping the circuit breaker.
Sorry! Just took that from the eBay description:
•300 watt PTC energy efficient electrical heating element
•Working towel rail temperature 65 C
•Electrical supply 220-240V - 50Hz
Cheers,
R.
That's what I meant - as it should be with no shorts.
Yes, faulty perhaps but how does the resistance reduce causing overload, let alone by such a huge amount?
There is no short to earth - there doesn't have to be for there to be a short from L to N.
I don't understand that. What do you mean how does it reduce causing overload?
I'm a little surprised that the first application of power didn't vaporise the fault, but there ya go.
Ah, you mean across the terminals or conductors - not through the filament.
I wasn't thinking of that.
As above.
It must be well made.
It could be through the element - it could have a short close to the two ends of it.
Wherever it is, it has (so far as we can tell) a resistance of 0.3Ω
And you asked, in effect, was "How does the resistance of 0.3Ω between L & N reduce causing overload, let alone by such a huge amount?".
Sorry - I still have no idea what you mean.
My apologise that does seem to be the case.
On a meter where the probes shorted reads 0.0 ohms, it is. I think his element is a short.
No, the resistance of the filament reducing from whatever it should be to 0.3Ω.
I had in my mind something like an immersion or oven element, not this small element where all the terminals, connections and flex are close together and fixed.
In these items (immersion or oven), if the L to E is open circuit (as it should be), and the L to N should be, say 19Ω, then there is no way any fault in the filament could result in this resistance becoming lower, reducing to 0.3Ω.
I presume that this small probe type element has the filament 'up and back' separated only by insulation so, I now realise, 'anything could happen'.
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