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In the UK, the letters, 'R-Y-B', stand for 'red-yellow-blue' which are the colours used to identify the lines (not phases) of a three-phase transmission or distribution cable. The colours are also used, in some cases, to identify the corresponding bushings for Transformers, circuit breakers, voltage transformers (potential transformers), etc., in substations. The sequence of these letters/colours also correspond to the normal phase sequence of the three-phase system.

In UK residential, commercial, and industrial installations, these colours have now been replaced by the EU harmonisation colours: brown-black-grey.

Other countries use different methods of identifying line conductors, including 1-2-3, A-B-C, R-S-T, L1-L2-L3, etc., or various combinations of these methods.

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