Why does a 3-phase current named as R,Y,B?

[Srini karthik]

Why does a 3-phase current named as R,Y,B??

A 3-phase current is normally called as R-Red, Y-Yellow, B-Blue,. y is it termed so? is there any specific reason?? we can't see any colour difference in transmission wires also!

 

[dlgoff]

The only color of 3-phase power that I know of is the color coding for the wires.

http://en.wikipedia.org/wiki/Three-phase_electric_power#Colour_codes

Conductors of a three-phase system are usually identified by a colour code,...

 

[ColinW]

Red Yellow and Blue were the colours of the wires used for the L1, L2 and L3 lives in three phase installations in the UK until 2006. Since then all new installations here have to conform to the EU standard colours Brown, Black and Grey. How this is meant to improve safety is anyone's guess, since there is no requirement (yet) to change old wiring and of course what used to be neutral (black) is now a live colour and what used to be live (blue) is now neutral. Such is life in the committee run insanity that is the European Union.