On 3/11/19 3:38 AM, Rob Atkinson wrote:
I've been told a lot of the copperweld problems today are due to
modern copperweld plating being cheap and no where near the thickness
of your dad's copperweld. The wire from say, 70 years ago is
nonexistent now and what you buy today has minimal copper. It's kind
of like the difference between steel hardware from the store that's
been zinc electroplated, and the good hot dip galvanized hardware from
manufacturers like Rohn.
That's hard to believe since Copper Clad Steel is rated by the
resistance compared to pure copper, and if the copper were thinner, the
resistance would be different.
They make 30% and 40% Copperweld - 30% and 40% of the conductivity of
pure copper in the same size, respectively. (3.3 and 2.5 ohms/1000 ft
for AWG 10)
The cladding on AWG 10 40% is probably about 6 mils, which is
substantially thicker than you can electroplate conveniently. The whole
process of making clad wire is a fascinating.
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