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