....
The only thing I do is to make sure I know which wire is
the manufactured leg at each machine. Some CNC equipment, especially
older equipment, can only tolerate the different voltage on one
particular leg


Typically L1. Not always..but typically.

Gunner
....

Now I know I'm not typical. I've redone a whopping three machines where this
mattered. All three had the wild leg on L2.

Karl