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odd color copper wire

1943 Views 3 Replies 3 Participants Last post by  theatretch85
I replaced 2 6g leads for my ac(240v) that had smaller leads... the old copper leads, one looked shiny copper and the other was a dull copper with some blackish spotting on it...

what would cause the copper to dis-color?

also I clamped an amp meter on to each lead and they both pulled 19 amps each...(dont know if that helps any)
1 - 1 of 4 Posts
Dull black copper sounds like it was overheated at some time. This can be due to a poor connection or excessive current draw. Is the insulation OK or does it also appear brittle or burned. 19A does not sound like you have an existing problem, assuming all is working OK..
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