Sandi wrote:

Some insulated multistrnd copper wire is pre-tinned and a lot is
not.

What is the purpose of pre-tinned wire? As far as I can see the
advantage is that the copper core doesn't oxidise which means the
wire can be soldered or fixed to a terminate with only minimal
cleaning.

Sounds like a good thing to me, so why isn't almost all wire pre-
tinned?

Is cost really so different?

Does the tinning-coating replace where copper would have been in
the overall wire and tinning is of higher reistence?

Is flexibility affected?

Are you certain that its tinned wire you are looking at and not
nickel-plated copper? That is often used for high temp applications
where the copper alone will oxidize.

--
Paul Hovnanian
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At some point it becomes necessary to behead all the architects and
begin construction. -- Abi-Bar-Shim (Project Mgr. - Great Pyramid)