[Solved] Relay and cables getting hot July 21, 2015 07:28AM |
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Re: Relay and cables getting hot July 21, 2015 07:38AM |
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Re: Relay and cables getting hot July 21, 2015 11:08AM |
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Re: Relay and cables getting hot July 21, 2015 01:28PM |
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Re: Relay and cables getting hot July 21, 2015 02:50PM |
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Re: Relay and cables getting hot July 21, 2015 03:44PM |
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Re: Relay and cables getting hot July 21, 2015 04:43PM |
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Re: Relay and cables getting hot July 21, 2015 06:40PM |
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Re: Relay and cables getting hot July 21, 2015 09:24PM |
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Re: Relay and cables getting hot July 22, 2015 02:12AM |
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Re: Relay and cables getting hot July 22, 2015 04:16AM |
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Quote
Downunder35m
For as an electrician the problem already starts with the heatbed.
Let's face it: Copper is for good connection and low resitance but not for heating, this is where materials like Nichrome or today even Carbon comes into play.
For the same amout of heat energy produced a proper resistance wire would need only a fraction of the amps.
Re: Relay and cables getting hot July 22, 2015 08:09AM |
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Re: Relay and cables getting hot July 22, 2015 08:24AM |
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Re: Relay and cables getting hot July 22, 2015 08:31AM |
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Quote
Downunder35m
You are a bit wrong assuming heat energy produced equals the power consumption.
If I take a given length of nichrome wire and use it to heat to a certain temp it will use far less current than copper getting to the same temp.
Re: Relay and cables getting hot July 22, 2015 11:46AM |
Registered: 8 years ago Posts: 606 |
Quote
Downunder35m
You are a bit wrong assuming heat energy produced equals the power consumption.
If I take a given length of nichrome wire and use it to heat to a certain temp it will use far less current than copper getting to the same temp.
Take a 1mm copper wire (for ease o calculations) and @12V increase the current until it reaches a temp of 100° C.
Now a 0.2mm copper wire and do the same.
You will notice the thinner wire requires less current as the resistance is higher.
With Nichrome you also have the benefit of the greater surface area (copper with the same resistance is much thinner) - and most people would agree heat transfers better using big surface instead of small spots.
Or why do you think no electric heater actually uses copper for the heating elements? - Please do explain!