What does it mean when there is voltage between ground and neutral (220V) and between phase and neutral (220V) but no voltage between phase and ground (0V)?

What could happen? Is it safe?

Is it normal that when I plug in a lamp, it works just fine?


Question: 25V for PMOS switch VGS?
Answer: Add a Zener diode from Source to Gate. This can either replace the resistor that you already have there or can be added in parallel with it. 

Zener voltage is not critical - anywhere from 12 to 20 Volts is fine.