Copper corrodes. It turns pretty green and blue. It eats up the wire.
If it is plated with something - it won't.

If you remember the old telephone lines - those with lots stretched across
crossbars....

Those are copper covered Steel. Thick - but it is known once the copper
is breached - as the steel changes the resistance. Methods were developed
to calculate the distance of the open, break or change in impedance.

We got some of this when the lines were falling down - abandoned lines.
They were on Air force property and old telegraph/telephone lines.

We used it in a massive grape arbor - strong steel copper clad wire.

Learned to coil wire with two hands that day.

Martin

Martin Eastburn
@ home at Lions' Lair with our computer lionslair at consolidated dot net
NRA LOH & Endowment Member
NRA Second Amendment Task Force Charter Founder



Proctologically Violated©® wrote:
Very interesting!

Which then suggests brazing electrical connections?

You omitted alum, nickel, gold.

Old wiring, at least in parts of NY, were soldered AND wire nutted!!
I think soldering of splices in house wiring is a very good, safe idea.
Just not all that convenient.

Now here's sumpn fer you electricians:

I have old cloth-covered #9-10 solid wire in my old cloth-covered house,
and sed wire is, I believe, *silver plated*!!!! Well, plated w/ sumpn,
brite and shiny.
If it *is* silver, it is a marvelous idea, because sposedly the bulk of the
current density in a conducting wire lies on the surface of the wire.
If it's tin plated, the question is then *why*!
Nickel??

Might make sense then, to silver, or even copper plate aluminum wire.
Like our pennies.
--
Mr. P.V.'d
formerly Droll Troll
"spaco" wrote in message
.. .

I was just looking up expansion rates of metal for another post. The next
column in the Machinery's Handbook lists electrical conductivity ratings.
I have worked with electricity in one way or another, most of my life, but
I never realized how poorly some metals that are commonly associated with
electrical connections are!

With Silver as Conductivity = 100,
Copper = 97.61 Yup.
Lead = 8.42 !!! No wonder car batteries get hot!!!
Tin =14.39 !!! Lead and tin are the main constituents of most soft
solders. If you ever needed a case for making a good mechanical joint
before soldering, there it is!

Oh-- page 2193 of the 19th edition.

Pete Stanaitis




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