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Wire size calcuation worksheet

David Meeker

20 Mar2015 *

Wire diameter fit from an AWG table, and the implied wire cross-section:

AWG d.wire 0.324861 in * 0.115943 AWG * - exp * :

AWG a.wire π 4 / AWG d.wire (2^* :

Density of various wire materials

ρ.cu 0.322 lb in 3^/ * :

ρ.al 0.1 lb in 3^/ * :

Electrical conductivity of various wire materials at room temperature

σ.cu 58106^* S m / * :

σ.al 0.65 σ.cu * :

Definition of Circular Mils, a funny units used by wire manufacturers

cmil π 4 / in 1000 / (2^* :

Resistance per unit length

length AWG R.wire length σ.cu AWG a.wire * / :

Mass per unit length

length AWG m.wire ρ.cu length * AWG a.wire * :

100 ft * 30 R.wire 10.319 Ω *

100 ft * 30 m.wire 0.0138 kg *