Chip,
So long as the wire is not excessively discoloured before you get it,
it shouldn't be a problem. Most tinned wires have ony just enough tin
on them to make them look tinned anyway - not enough to provide real
protection.
You can get into problems if the wire has been exposed to contaminants
- looks black when stripped - but this is rare. In this case tinned
wire would also present problems.
Given the use you are putting it to & the likely environment I
wouldn't have any worries.
Richard P  

On 29/07/05, Chip Webber <cwebber@hotpop.com> wrote:
> Greetings,
> I recently ran across a good deal on deal on *untinned* 22ga solid hookup
> wire that will be used primarily on solderless breadboards and other
> projects for a design lab at a University.
> I realized that most of the wire that I have used recently for breadboarding
> circuits in pre-tinned.  I understand that there are probably more
> complicated issues concerning production and high-volume work, but I am only
> concerned about the one-of projects and prototypes.
> 
> Am I going to get myself in trouble if I buy 1000' of untinned copper wire?
> I guess I'm just thinking twice about it because it was about 1/2 price and
> on "surplus".
> 
> Issues I can think of are:
> -oxidation of copper.
> -ease of solder of pre-tinned wires.
> 
> Are there other issues?  I can't remember having any problems before.  I
> can't even remember it being an inconvenience.
> 
> Thank you,
> Chip
> 
> 
> 
> 
> 
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