Aluminum whip on 30 amp oven

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goldstar said:
I would bet that's the case. If you look carefully at the ends of the wire strands you'll probably see the copper conductors.
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I've been fooled by tinned copper before. Older rag wire, looked like it was AL, but when I pulled it off the breaker, found it must have been factory tinned as even stripping back it still had that bright look AL but could "shave" some of tin off to find copper underneath.
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Thanks everyone! These forums are really handy. I’m going to go with Polaris lugs and bill the contractor. Wasn’t even supposed to be wiring the oven. One of those “since you’re there” moves
 
Fred B said:
I've been fooled by tinned copper before. Older rag wire, looked like it was AL, but when I pulled it off the breaker, found it must have been factory tinned as even stripping back it still had that bright look AL but could "shave" some of tin off to find copper underneath.
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Honestly I think it’s a bad use, but probably a reason why (cheaper?). Kind of like how all the 12 nm and 14 nm use to be the same color sheathing. There’s a reason they made all the color change in sheathing 🤔
 
Fred B said:
I've been fooled by tinned copper before. Older rag wire, looked like it was AL, but when I pulled it off the breaker, found it must have been factory tinned as even stripping back it still had that bright look AL but could "shave" some of tin off to find copper underneath.
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The reason why copper wires are tinned, just a side-bar to this (not looking to pirate the thread). Years ago when wire manufacturers started insulating wires, they used a rubber coating on the copper conductors. They found that the coating was corroding the wire and then began tinning the cooper to avoid the corrosion. Apparently the coating has no affect on tin. If I can find the article I'll post it here.
 
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