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That's a significant difference in price!
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buy on Amazon, put up a folding table in Lowe's parking lot and sell these at $75
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Speedy wrote:
Boy, have I been out of it for far too long. My use of Romex only included three wires; a hot, a neutral and a ground. Now they come with five wires. Holy moly.

Comment on the Amazon listing is that they have the wrong item pictured, they provide a picture of the actual wire bought. Would be interesting to know what the pictured wire is used for, the two conductors on the left side are visibly smaller gauge.
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Southwire Romex SIMpull 25-ft 10/3 Solid Non-Metallic Wire (By-the-Roll)
What's it made from that conducts electricity?
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Doing a search, the two extra conductors are for controls like dimmer circuits.
Home Depot lists it as "SIMpull NM-B-PCS Duo Cable."
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Speaking for anyone living in the Chicago area, I forgot that Romex still existed.