Rewiring of a stator - The math behind it

[Luchekv]

Hi all, I recently saw a video on youtube where a fellow re-wires and old stator from a washing machine in order to reduce voltage from 400VAC to a safer value. See here.

Couple of questions:
1.) A before and after image/schematic is shown with a description of the configuration. Respectively 42 Pole 1x14C & 42Pole 7x2C - What does the 1x14C/7x2C mean?
2.) What is the math behind this re-wiring? Normally I would use this formula to calculate what I need:

p = 120f/n

However (unless it's a mistake) the video shows that in both before/after shots that the config has 42 Poles - So what's the math behind this?
Before:

After:


Thanks in advance!

 

[Guineafowl]

14 coils per phase in the first diagram, 7 groups of 2 coils per phase in the second.

I’m not sure what is unsafe about 400V versus whatever voltage it was converted to, nor why he didn’t just convert to delta 230V, but I haven’t watched the video yet.