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Johnny_B_Goode 2020-08-28 17:34:56
They're NOT silicone insulated cables (hence only the four star rating for not being precisely as described). I set my KSGER T12 soldering station to 200 deg C and gently stroked the tip against the croc clip end of the black cable which left a slightly flattened imprint showing that the insulation had softened and then set in an altered shape. I had already verified that the soldering iron's own silicone cable was the real deal by doing the same test. Although the insulation on the black banana to croc clip lead did soften and alter its shape, I couldn't detect any odour of melted PVC. The insulation might not be PVC but it sure as Hell Fire ain't silicone. Other than that, the cables are fine for use with 10 amp rated bench supplies. As others have done, I strung all five in series and shorted my 10A bench supply with them. I had to turn the voltage up to around the 2v mark before I was able to set a 10A current limit. I measured the volt drop across each section (avoiding inclusion of the inter lead contact resistance between each section). This was a quick test a few days ago. I didn't take any notes other than to work out a dissipation of 7W at 20A for each 1 metre lead which at 70mW per centimetre, I figured would warm the cable a little but not enough to immediately damage the insulation. By that reckoning, 15A will produce just under 40mW per centimetre and 10A, a mere 17.5mW/cm which might just be detectable as a modest warming over an hour or so of such abuse. From that one key 7W loss at 20A figure I'd managed to make a mental note of, it seems the resistance per lead is 17.5milli Ohms (175mV at the 10A test current I'd used) this value is in fairly close agreement with the figures obtained by others who had bothered to measure the resistance of their own leads. As long as you keep in mind that they're NOT silicone insulated, they'll be fine for use with a 10A rated bench supply. For 15 or 20A supplies, you'd best run your own test to be safe.
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