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Low Earth Orbit
Lighting & Electrical
Correct feeder cable for distro
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<blockquote data-quote="Rob Timmerman" data-source="post: 217856" data-attributes="member: 172"><p>If you have ferromagnetic material near the cable, you will get current flow into that material due the the changing magnetic field. That current circulates and can cause heating of the material. This is the "eddy current" phenomenon, and is how induction heating works. This is a cause for concern, and is covered by Article 300.20 of NFPA 70 (which generally requires conductors for a circuit to be grouped of there to be slots in the metal so that there isn't a closed-loop path for current to circulate).</p><p></p><p>But the case of the coil functioning as an inductor isn't cause for concern from a heating perspective, and the choice of over-over, over-under, or figure-8 depends on how you choose to manage cable twist, and how much you care about creating an electromagnet.</p></blockquote><p></p>
[QUOTE="Rob Timmerman, post: 217856, member: 172"] If you have ferromagnetic material near the cable, you will get current flow into that material due the the changing magnetic field. That current circulates and can cause heating of the material. This is the "eddy current" phenomenon, and is how induction heating works. This is a cause for concern, and is covered by Article 300.20 of NFPA 70 (which generally requires conductors for a circuit to be grouped of there to be slots in the metal so that there isn't a closed-loop path for current to circulate). But the case of the coil functioning as an inductor isn't cause for concern from a heating perspective, and the choice of over-over, over-under, or figure-8 depends on how you choose to manage cable twist, and how much you care about creating an electromagnet. [/QUOTE]
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Correct feeder cable for distro
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