Can you collect one 220 volt phase from a 380 volt three phase plug?

Answer for UK and countries running a 50 Hz supply service.

The voltage potential of 380 volts is not common to North America.

It will probably be difficult to tap into the plug to get the voltage.

If you have a three phase 380 volt supply from a source then you can obtain a single phase voltage of 220 volts from it. 220/380 is a wye voltage connection. 380 divided by 1.73 will give you 220 volts. L1 - N = 220V, L2 - N =220V, L3 - N = 220V. L1 - L2 = 380, L2 - L3=380, L3 - L1 = 380.