The three phases may be represented by numbers (1, 2, and 3) or by letters (a, b, and c) or by colours (red, yellow, and blue,i.e.,R, Y, and B). In India, they are named by R, Y, and B,that is, red, yellow, and blue.


The three phases may be represented by numbers (1, 2, and 3) or by letters (a, b, and c) or by colours (red, yellow, and blue,i.e.,R, Y, and B). In India, they are named by R, Y, and B,that is, red, yellow, and blue.
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