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Return to: Electronics related to alternative Energy |
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#Post#: 4054-------------------------------------------------- |
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Wire Gauge Physics |
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By: lynx wind Date: August 5, 2014, 9:19 am |
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Wire is pulled through a machine with a gauge or tool that forms |
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it. With every pass the wire becomes smaller in diameter. A |
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smaller number corresponds to a larger diameter. So 17 awg is |
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bigger than 20 awg. |
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An increase of three gauges corresponds to a halving of the |
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cross sectional area of the wire and a doubling of the |
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resistance. The reason you might use two strands rather than |
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one is for easier winding, tighter curves around the form, or |
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closer packing of the wire. |
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If you are more interested in current carrying ability than |
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physical size, then also remember that a change of 3 AWG numbers |
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equals a doubling or halving of the circular mills (the cross |
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sectional area). Thus, if 10 AWG is safe for 30 amps, then 13 |
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AWG (yeah, hard to find) is ok for 15 amps and 16 AWG is good |
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for 7.5 amps. The wire gauge is a logarithmic scale base on the |
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cross sectional area of the wire. Each 3-gauge step in size |
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corresponds to a doubling or halving of the cross sectional |
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area. For example, going from 20 gauge to 17 gauge doubles the |
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cross sectional area (which, by the way, halves the DC |
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resistance). So, one simple result of this is that if you take |
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two strands the same gauge, it's the equivalent of a single wire |
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that's 3 gauges lower. So two 20 gauge strands is equivaent to 1 |
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17 gauge. Wire Gauge Resistance per foot 4 .000292 6 .000465 8 |
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.000739 10 .00118 12 .00187 14 .00297 16 .00473 18 .00751 20 |
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.0119 22 .0190 24 .0302 26 .0480 28 .0764 |
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Read more at: |
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http://www.epanorama.net/documents/wiring/wire_resistance.html |
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