Question

Why we use 220 volts in three phase supply .??

Answer 1

Answer:

basically physically chemically biologically

Explanation:

I don't know the answer

Answer 2

Now all the 3 phases (i.e., 3 cables in the 3 phase supply ) have the same max rms (for undestanding you take it as avg.) value. i.e. if you take any of the phases and check its voltage against neutral it will come 220 or 240 or so. But when you take the voltage between one phase to the other then it becomes 440.