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David J
I think it's the photo - I've used cable like that in the past, a pair of wires in red and black. When you pull them apart it leaves a bit of red on the black sleeving. My cable is the stuff used in solar panel insulation, good for 25A or so and I don't think that this is much thinner.
Nowadays I use the silicone-sleeved stuff that's made for electric R/C aircraft - not expensive, flexible, heat-resistant and good for high Amperage.
What gauge silicone wire do you use for your heatbed?
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David J
The only down-side of that R/C model cable is that you need a big iron to solder it! It is made up of 50 or 60 strands, so you need something with a high thermal capacity to make a good, quick joint.
Not really, I'm able to solder this stuff just fine with a Hakko FX-888D and a 2.4mm chisel tip:
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