This article was posted 10/27/2006 and is most likely outdated.

Article 210 Branch Circuits 210.5

Subject - Article 210 Branch Circuits 210.5

October 27, 2006  

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Branch Circuits

210.5 Identification for Branch Circuits

The requirement for branch-circuit identification was relocated from 210.4(D) to 210.5(C) and the text expanded to require circuit identification for all circuits, not just those that are multiwire.
(C) Ungrounded Conductors. Where the premises wiring system contains branch circuits supplied from more than one voltage system, each ungrounded conductor, where accessible, must be identified by system. Identification can be by color-coding, marking tape, tagging, or other means approved by the authority having jurisdiction. Such identification must be permanently posted at each branch-circuit panelboard or branch-circuit distribution equipment. Figure 210-3

Authorís Comment: Electricians often use the following color system for power and lighting conductor identification:
  • 120/240V single-phase: black, red and white
  • 120/208V three-phase: black, red, blue and white
  • 120/240V three-phase: black, orange, blue and white
  • 277/480V three-phase: brown, orange, yellow and gray, or brown, purple, yellow and gray

Figure 210-3
(Click on image to enlarge)


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  • Time and time again we see voltages improperly stated. Please amend your documents to coincide with the NEC and IEEE stds.

    208Y/120V is 3 ph, 4 wire, 480Y/277V is 3 ph 4 wire,

    120/208Y is a 1 ph, 3 wire, open wye system.

    240/120V is a 3 ph, 4 wire high leg delta.

    B King

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