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The white line on a black wire typically indicates that the wire is a hot wire that has been re-identified for use as a different phase or conductor in a circuit, often in situations where the wiring color code needs to be modified for clarity or safety. In electrical wiring, black is usually used for hot wires, while white is reserved for neutral wires. The marking helps ensure proper identification and prevents confusion during installation or maintenance. Always consult local electrical codes and standards for specific guidance.

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1w ago

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