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Current-Carrying (Fusing) Capacity of Wire
March 1935 Radio-Craft

March 1935 Radio-Craft

March 1935 Radio Craft Cover - RF Cafe[Table of Contents]

Wax nostalgic about and learn from the history of early electronics. See articles from Radio-Craft, published 1929 - 1953. All copyrights are hereby acknowledged.

Radio-Craft magazine used to run a feature where readers would write in with questions, and someone on the staff would respond. This March 1935 issue's query requested a table containing maximum current carrying (fusing) 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).

Current-Carrying Capacity of Wire

Current-Carrying Capacity of Wire, March 1935 Radio-Craft - RF Cafe(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!

Current Required to Fuse Wires, Copper, German Silver, and Iron



Posted November 3, 2023
(updated from original post on 10/10/2016)

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About RF Cafe

Kirt Blattenberger - RF Cafe Webmaster

1996 - 2024


Kirt Blattenberger,


RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while tying up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

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