What is the meaning of the number of conductor per phase in electrical wiring system?

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tipu_sultan

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I am a little bit confuse about the conductor per phase and ECC in mm2 as mentioned in the attached figures.




In the above figure there is a data of a Substation containing Feeder-pillars and the second figure contains the data of Feeder-pillars.
Can any one help me about these two terms.

Why number of conductor per phase in Substation is Two while number of conductor per phase in Feeder-pillar is one.

And what ECC Stands for?
Is it a abbreviation or some kind of unit?
 

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