Answer / chandrashekar

just simple multiply by Square root of 3
sq. rt.3=1.73
therefore
1.73*240v=415v

Answer / khadar baba

per phase values is 415/1.732 =240V
that is why single phase is 240V

Answer / pradhyumn

In a 3 phase supply,at any instant one of the phase act as
a returning path for the two phase in a same way as neutral
is used in single phase so 3 phase is 440V and not 660V.

Answer / sajid hussain

For three phase
1.732*220v=381v
if single phase voltage is 220 then three phase is 381v. just multiply 1.732 to your single phase voltage.

Answer / supreet virdee

hey if we consider 3 phases R,Y,B
we know tht in each phase there is 220v that means in 3 it
should be 660v. but we gnerally consider 2 phase i.e.
combination R-Y,Y-B,R-B, there fore the total voltage is
440v or 415v.

Answer / rajesh

Whrere 3 Phase Star connection
Line vlotage = root 3 * phase voltage
if line voltage (Phase to Phase) = 415V
then phase voltage (phase to neutral) = 415/(root 3)
= 240v

Answer / md. obaydur rahman

In case of single phase voltage the voltage is measured from
1-phase to neutral but in case of 3-phase voltage the
voltage is measured from 1-phase to another phase but not
among three phases. Hence the 3-phase voltage is
=1.732*single phase voltage.

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