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The standard voltages for three phase at which the supply authorities deliver power to the consumer is:
1. 240 V, 50 Hz, 2 wire
2. 415 V, 50 Hz, 4 wire
3. 415 V, 50 Hz, 3 wire
4. 240 V, 50 Hz, 4 wire 

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Correct Answer - Option 2 : 415 V, 50 Hz, 4 wire

3-phase, 4-wire, 415 V, 50 Hz is the standard parameter for three phase at which the supply authorities deliver power to the consumer.

Concept:

Primary transmission :

The electric supply (132 kV, 220 kV, 500 kV or greater) is transmitted to load center by three-phase three-wire (3 phase - 3 wires) overhead transmission system.

Secondary transmission :

At the receiving station, the level of voltage reduced by step-down transformers up to 132 kV, 66 or 33 kV and electric power is transmitted by three-phase three-wire (3 phase - 3 wires) overhead system to different substations.

Primary distribution :

At a substation, the level of secondary transmission voltage (132KV, 66 or 33KV) is reduced to 11 kV (in a three-phase three-wire overhead system) by step down transformers. Large industrial consumers takes supply from here.

Secondary distribution :

  • Electric power is given to (from primary distribution line (i.e.) 11 kV) distribution substation.
  • This substation is located nearby consumers area where the level of voltage reduced by step down transformers is 415 V.
  • In a 3 phase four wire system (3 phase - 4 wires), there are 415 volts (Three-phase supply system) between any two phases and 230 volts (single-phase supply) between neutral and any one of the phases (lives) wire.
  • Residential load (i.e. Fans, light, and TV, etc) may be connected between any one phase and neutral wires, while three-phase loads may be connected directly to the three-phase lines.
  • A three-phase 415V, supply is used for supplying small industrial and commercial loads such as garages, schools, and blocks of flats. A single-phase 230 V supply is usually provided for individual domestic consumers.

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