March 1935 Radio-Craft[Table of Contents]
People old and young enjoy waxing nostalgic about and learning some of the history of early electronics. Radio-Craft was published from 1929 through 1953. All copyrights are hereby acknowledged. See all articles from Radio-Craft.
Radio-Craft magazine used to run a feature where readers would write in with questions, and someone on the staff would respond. This month's query requested a table containing current carrying capacities for various wire gauge sizes. Values of fusing current were provided for 10 through 40 GA, for copper, German silver, and iron. The "B. & S. Gauge" wire size scale refers to Brown & Sharpe, which now goes by the designation of American Wire Gauge (AWG).
(313) Mr. L. L. Sander, Los Angeles, Calif. (Q.) I should be glad if you would tell me where a chart showing current-carrying capacity of wires of various gauges can be obtained.
(A.) Since a wire will pass current until it fuses, we print herewith an interesting chart (courtesy of General Electric Supply Company) showing current necessary to fuse wires of different gauges and materials. Note that a No. 40 copper wire will actually take over 1.5 amps. without fusing!
Posted October 10, 2016