### 440 Volt Current/ why on 440 volt in 3 phase

# Why is there only 440 volt current in 3 phase?

**To know about 3 phase current, first we need to know about single phase current flow. AC current always travels in wave form. As you can see in the graph given below. **

When current flows, it travels in a wave form. There are 2 points of that wave, postive and negative point. Both these peak points are the points when the voltage is at its full voltage. But there is also a 0 point in between the two points. 0 point is the point when there is no voltage in the phase.

The journey of current from positive to negative goes on very fast. A process happens so fast that 0 point is not detected, where the voltage is 0, just a slight variation of 4-5 volts comes.

**Why is there only 440 volts in 3 phase? **

When current flows in 3 phase, then the peak point timing of the wave of all three phases is not the same, the wave of all three phases starts from different places.

In all the three phases at a time only two phase waves are at the peak point and the rest of the 1 phase wave is at 0 point. In this, 0 point is the point when the voltage is 0 and peak point is the point when the voltage is full i.e. 220 volts.