Answer / mukesh

it is not a three phase voltage is three times the single phase voltages. we only take a voltage between two points not between three points. so when we measure voltage between two points in single phase system there is one of its point at higher potential and other is at zero potential(reference point). but in the three phase system if we take a reference point and measure voltage between them (between reference and higher potentials) and adds up algebraically we got a voltage 400 v. if we also measure voltage between two higher potential we got 400v due to the wave forms of phases reaches at potentials according to time. but this not happens that both the voltage reaches at higher vale in the same instant. so its never been 660 v....

Answer / rajakumar

11 questions answer 440v correct

Answer / percy

3 phase doesnot means 230+230+230

in three phase three lines carry same voltage but displaced
in time by 120* that is we obtain V (L-L)=400kv

Answer / dragon heart

because of the power generated from the 3 phase transformer
connected in Y

Answer / hemantpandey

because
single phase =phase voltage /square root of three
and the other reason is that the two terminals

Answer / kumar

our measering meater is have only two terminal that y 400v

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