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Three-Phase Wire Color Code

This entry was posted on January 12, 2024 by Vita Chernikhovska

The three-phase color code in North America is as follows:

Black for Phase 1 (L1)
Red for Phase 2 (L2)
Blue for Phase 3 (L3)
White or Grey for Neutral
Green or Green with Yellow stripe for Earth (Ground)

A three-phase power line is an electrical distribution system using three alternating currents, each phase 120 degrees apart for a stable power supply.
Three-phase power lines are used over single-phase power lines primarily for industrial and commercial applications that require high power loads, such as in manufacturing facilities and large commercial buildings. They are also used to transmit power over long distances.

three-phase color code

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Author Bio

Vita Chernikhovska

is a dedicated content creator at Nassau National Cable, where she simplifies complex electrical concepts for a broad audience. With over a decade of experience in educational content and five years specializing in wire and cable, her work has been cited by authoritative sources, including the New York Times. Vita's popular series, such as 'What is the amp rating for a cable size' and 'How to wire different switches and appliances,' make technical information accessible. She also interviews industry professionals and contributes regularly to the wire and cable podcast.