If the 1-phase supply is 230V, why 3-phase supply 400, not 690?
If the 1-phase supply is 230V, why 3-phase supply 400, not 690?
Answer:
The voltage level between any two phases out of three phases in a three-phase system is 400V, not 690V.
This is only possible in case of ±% variation e.g. 400V±10% = 400V + 40V = 440V1.
The voltage level between Phase and Neutral in the Single Phase system is 230V.
