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Does the NEC specify a particular color arrangement for three phase systems?

No, but 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.

Courtesy Mike Holt Enterprises, Inc.

CTA-ID : 2042007
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