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Power Wiring - Color Codes

Color codes used in power wiring.

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Typical power wiring color codes

120/240 Volt

  • black - phase 1
  • red - phase 2
  • blue - phase 3
  • white or with 3 white stripes - neutral
  • green - ground

277/480 Volt

  • brown - phase 1
  • orange - phase 2
  • yellow - phase 3
  • gray or with 2 white stripes
  • green with yellow stripe - ground
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