A widely accepted practice is to identify 3-phase ungrounded (hot) conductors as ____ in 208/120 volt, 4-wire, wye-connected systems.
A) yellow, green, and blue
B) black, red, and blue
C) red, yellow, and green
D) black, red, and white

Question

Quizplus · Accepted Answer

The most commonly used colors for 3-phase ungrounded (hot) conductors in 208/120 volt, 4-wire, wye-connected systems are black, red, and blue. This is consistent with the standard colors for AC power wiring. White is typically used as the neutral conductor, and green or green/yellow striped is used for the grounding conductor.

A Widely Accepted Practice Is to Identify 3-Phase Ungrounded (Hot)