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The wire sheathing itself is usually marked. e.g. 14 CU 2 or 14/2 CU will indicate 14 gauge 2-wire (+ ground) copper (CU being the symbol for copper on the Periodic Table). For 15amp circuits you will likely has 14 gauge wire with most of that being 14/2 (Usually white, black, and bare copper).

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13y ago

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To determine the gauge of wire in your house, look for markings on the insulation or jacket of the wire. It usually indicates the gauge size, such as 14, 12, or 10. You can also use a wire gauge measuring tool to accurately determine the wire gauge.

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10mo ago
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Q: How do you tell what gauge wire you have in your house?
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