MadMerv
Free Member
you all might find this informative.......
http://www.ehow.com/video_8059395_coil-extension-cords-won_t-tangle.html
http://www.ehow.com/video_8059395_coil-extension-cords-won_t-tangle.html
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So it's OK to use it like that, all folded in 3 and all those loops in it like he says, and it won't overheat?
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There's plenty of air circulation, no problem. It's when they are on a reel the air is trapped, then, there is an overheat danger.
It is not the air that is the problem Brian.. it is the fact you have a very big coil, that by induction into its self causes the issue.. the more current drawn the worse the effect..
Just to confuse the issue there is a formula that allows you to work out the safe working limit of the wire once in coil form.. As a rough guide maximum safe load can be reduced by up to 90%, so a big coil of say, 15 amp 2.5 cross section wire can be reduced down to as little as 1.5 amps
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It is not the air that is the problem Brian.. it is the fact you have a very big coil, that by induction into its self causes the issue.. the more current drawn the worse the effect..
No you don't have a very big coil you have several tiny coils.
Good old internet saves me typing in all the old formulea.
Go here:
http://www.daycounter.com/Calculators/Air-Core-Inductor-Calculator.phtml
Enter 4 inches diameter. 0.5 turns. Length 0.5 inch and it throws up
0.04348 uH or 0.00004348 mH.
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Enter 50 Hz. 0.05 ohms. 0.00004348 mH. 0 uF and it calculates 0.01 ohms.
So feed 13A through 0.01 ohms and you have 1.7 watts.
So at how hot is that wire going to heat up in free air with under 2 watts of heat.
No a lot !
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As young soldiers that's how we were taught to gather up the lines on a round parachute. Daisy chaining we called it.
The theatre industry has been coiling cables properly for years and we didn't get tangles..and none of that dividing by thirds crap and then knit one purl one rubbish.....lol
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