The point to remember with an AC signal is that peak-to- peak is not a real thing,as the negative & positive half cycles are not present at the same time.
It exists primarily so that if you take a "peek" at the waveform with an Oscilloscope.you have a convenenient measurement to compare
with other readings,so you may for instance, read 20mV p-p & adjust it to 50mV p-p,without having to calculate the actual peak or RMS
values.
Peak to Peak is also used,when AC & DC signals are combined,for instance, the input circuit of a particular amplifier may need to go between +2v to -2V without being either clipped by the input circuitry or driving the output device into clipping.
The only "Peak" voltage you need to think about when dealing with normal single phase 220V AC circuits is the peak voltage in
any half cycle.
RMS is the same value as that DC voltage which would need to be used to dissipate the same power in the same load resistance as that achieved using an AC supply.
A classic method is to heat some water electrically---good old 19th Century technology!
As has already been pointed out,V peak for VRMS of 220v is,near as dammit,311V.