Yes, there is a difference between single phase and three phase circuits.
You can divide a three phase service into (3) single phase circuits providing you have a 4th neutral wire.
Check continuity
Electrical circuits are designed in two phase types. Either single phase or three phase. A single phase is one wave of electricity while three phase is three waves that are offset.
yes we can use as a single phase circuit because at practise directly the 3-phase circuit is made by combining the three single phase circuits
Probably
A three phase system will have 3 phase branch circuits and no neutral.
Your incoming 208V 3 phase power supply will also need an incoming neutral of the same conductor size. Then any single pole breaker installed in the panel will have 110 volts to the neutral. That is you can run 208V 3 phase motor circuits from a three phase breakers in the panel and any number of 110V circuits from single pole breakers.
We can do wiring in staircase by two different circuits.(i.e. R or Y or B).
I do not believe any lighting fixtures of any voltage have ever been made to work off of three-phase circuits. Light Fixtures are always single-phase 2-wire circuits In the USA the standard voltages for branch circuits are: 120, 208, 240, 277 or 480 The light fixture must be rated to match whichever field voltage is being used. Some light fixtures are made multi-rated so they can be used on more than one circuit voltage
For a three phase distribution system there is one neutral. In North America the electrical code allows three individual branch circuits to connect with one neutral as long as the three circuits each use an individual phase leg. This differs from 120/240 volt single phase wiring where only two legs can be used with one neutral.
A K. Ahmed has written: 'Power factor correction of single-phase rectifier circuits with non-sinusoidal supply voltage'