Voltage and current ,range of all voltages

Voltage and Current
              As an expression of potential energy is always relative between two locations or points.Some times it is called a voltage drop.When a voltage source is connected to a circuit the voltage will cause a uniform flow of charge carriers through that circuit called a current.

Low Voltage 100--1000v
Medium Voltage 1kv--100kv
High Voltage  100kv--345kv
Extra High Voltage  345kv--765kv
Ultra High Voltage     greater than 765kv


       In electrical power system low voltage most commonly refer to the main voltages as used by domestic and light industries commercial consumers.
   Colour coding of LV power cable
 1-Phase-1 :Red colour.
 2-Phase-2 :Yellow colour.
 3-Phase-3 :Blue colour.
 4-ground green or Green/yellow colour.

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