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Low Earth Orbit
Lighting & Electrical
Correct feeder cable for distro
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<blockquote data-quote="Fred Campbell" data-source="post: 217847" data-attributes="member: 6035"><p>It is a long, long time ago that I learned electrical theory, so the laws of physics might have changed since then, but I was taught that ideal inductors were reactive components and thus did not dissipate energy. Real life inductors dissipate energy mainly because they also have a resistive component. Also, as someone previously mentioned, general purpose main cables have two close coupled conductors where the current is in opposite directions, cancelling out any induction effects however you wrap them.</p><p></p><p>Any cable will have a resistance, albeit very low. The resistance is usually specified in m ohms/metre Current flowing through this resistance will dissipate energy in the form of heat in Joules/sec/metre (W/m). Cables with a larger cross-sectional area have a lower resistance for a given length and, assuming the same current, will therefore dissipate less energy so not heat up as much.</p><p></p><p>Coiling the cable concentrates a longer length into a smaller area, so more Watts, and inhibits its ability to dissipate the heat. This results in the cable getting hotter, possibly to the point of melting the insulation.</p></blockquote><p></p>
[QUOTE="Fred Campbell, post: 217847, member: 6035"] It is a long, long time ago that I learned electrical theory, so the laws of physics might have changed since then, but I was taught that ideal inductors were reactive components and thus did not dissipate energy. Real life inductors dissipate energy mainly because they also have a resistive component. Also, as someone previously mentioned, general purpose main cables have two close coupled conductors where the current is in opposite directions, cancelling out any induction effects however you wrap them. Any cable will have a resistance, albeit very low. The resistance is usually specified in m ohms/metre Current flowing through this resistance will dissipate energy in the form of heat in Joules/sec/metre (W/m). Cables with a larger cross-sectional area have a lower resistance for a given length and, assuming the same current, will therefore dissipate less energy so not heat up as much. Coiling the cable concentrates a longer length into a smaller area, so more Watts, and inhibits its ability to dissipate the heat. This results in the cable getting hotter, possibly to the point of melting the insulation. [/QUOTE]
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Correct feeder cable for distro
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