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  • bare copper wire is copper orange color.
  • tinned copper wire is silvery color.
  • enamel coated copper magnet wire can come in any color, depending on enamel.
  • plastic coated copper hookup wire can come in any color, depending on plastic.

copper wire for household wiring is color coded using plastic coating:

  1. black - hot 120 VAC
  2. white - neutral 0 V current return
  3. green - ground 0 V safety return (no current normally)
  4. red - hot 120 VAC, opposite phase from black for use in 240 VAC hookups
  5. etc.

copper wiring for industrial 3-phase power has additional colors, which I won't visit here.

copper wire for electronic use follows an entirely different color code:

  1. red - positive DC power
  2. black - DC return
  3. green - negative DC power, or signal if no negative power
  4. other colors - signals

don't confuse color codes!

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