Answer / v v r s

three phase supply means RYB AND NEUTRAL 4 WIRE SYSTEM

( phase to phase voltage is 415V and phase to neutral is
230V )

Two phase supply RY OR YB and neutral

Answer / avinash jakate

in polyphase altermating current two circuit used with
voltage phase differing by 90 degree is called two phase
supply system.
whereas atleast 3 conductor carrying electricl voltage
phase differening by 120 degree to connect load is called
three phase supply.

Answer / vaibhav

TWO PHASE SUPPLY MEANS HAVE 3 LINES R,Y,N.WHERN RN AND YN
ARE TWO PHASE.RN IS ONE PHASE AND YN IS ANOTHER PHASE.
WHERE AS RN,YN,BN ARE THE THREE PHASE WITH 4 LINE . AND N
IS RETURN PATH FOR EACH PHASE.

Answer / v8snail

In the case you're asking the question about 2 phase power in the farming community (as opposed to the old 90 degree out of phase 2 phase power), although colloquially known as 2 phase it is in fact split phase power. Due to economics of the long transmission lines required for rural electricity distribution, only 2 conductors are usually used at an elevated voltage (often 22 kilovolts) and a transformer utilised at each spur line tapping point (often 1 for each property) which converts the high voltage to 480v with a centre tap effectively giving 2x 240v in phase (for Australia). These two phases can be split between different circuits in a house or workshop, or in the case of high current draining devices or machines (like a wool press, large welder, large heating element or large pump) can be connected in series to give 480V power for devices designed to operate on this voltage, with only half the current required than for 240v single phase. 2 phase motors often have the option in the junction box to wire it up as single phase 240v or 2 phase 480v (a typical wool press will draw about 20 amps on 240v single phase and only 10 amps connected as 480v 2 phase).
3 phase was explained in earlier posts, usually requiring 4 conductors for transmission with 1 being for the neutral/earth return.

Answer / bala.a

in the 3 phase system no need separate neutral wire because
phase to phase have 120 deg phase shift,so by the cycle one
phase alternatively act as neutral.

Mr . vinoth babu please explain the above statment .

Answer / vinothbabu.k

2 phase supply ststem have 2 wire, one act as a phase and
another act as neutral or we have for safty purpose we go
to earth system so we add anoher one wire for 2
phase.example:red,black,green wire.1.red -act as
phase,2.black act as neutral,3.green act as earth.
for phase to neutral or phase to earth =240volts as per
indian standard.
in 3 phase system has red,blue&yellow here also for safety
need green wire used for earthing.RED TO YELLOW OR YELLOW
TO BLUE OR BLUE TO YELLOW=415V.any one of the two phase we
have 415v,but phase to earth we have 240v.
in the 3 phase system no need separate neutral wire because
phase to phase have 120 deg phase shift,so by the cycle one
phase alternatively act as neutral.

Answer / r r estake

in 2 ph supplu there is no neutral , but in three ph supply
one ph act as a neutral & all 3 phases are 120 degree
spaced to each other.

If a 3 phase transformer is a 500 kva using the formulae 500kva= 500000/433 x 1.732 = 666.71amps does this mean that each phase on the secondary side is 666.71

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