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The resistance of copper wire is approximately 1 Ω / 1000 ft for 10 AWG, 10 Ω / 1000 ft for 20 AWG, 100 Ω / 1000 ft for 30 AWG, and so on. [ 5 ] : 27 For an arbitrary gauge n , it's approximately 10 n /10 Ω per 10 000 ft .
A device for measuring American wire gauge. Wire gauge is a measurement of wire diameter. This determines the amount of electric current the wire can safely carry, as well as its electrical resistance and weight.
A table of the gauge numbers and wire diameters is shown below. [ 1 ] [ 2 ] The basis of the system is the thou (or mil in US English), or 0.001 in . Sizes are specified as wire diameters, stated in thou and tenths of a thou (mils and tenths).
Also, the size of the aluminum wire needs to be larger compared to copper wire used for the same circuit due to the increased resistance of the aluminum alloys. For example, a 15 A branch circuit supplying standard lighting fixtures can be installed with either #14 AWG copper building wire or #12 AWG aluminum building wire according to the NEC ...
It is meant to show how the resistance doubles with every increase of 3 in AWG. And only 10 sizes are shown per column to show how the resistance increases by a factor of 10 for each increase of AWG by 10. I say the beauty of the original table in the reference is lost by the table in this article.
The gauge numbers in SWG (standard wire gauge) and AWG (American wire gauge) reduce as the wire gets larger. Sizing in square millimeters is common outside of the US. Suppliers and manufacturers often specify their cable in strand count. A 189 strand count wire has a cross-sectional area of 1.5 mm 2 which equates to 126.7 strands per mm 2. [5]