When To Use 12/2 Wire

What's the difference between 10 2 wire and 10 3 wire? 12-2 wire vs 12-3 wire Wire electrical ebay

12-2 Wire vs 12-3 Wire | DoItYourself.com

12-2 wire Knob steady construction doityourself

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12-2 Wire | eBay

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What's the difference between 10 2 wire and 10 3 wire?

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12-2 Wire vs 12-3 Wire | DoItYourself.com