Since the start of the industrial revolution, and even before, that line of who did what and when has been a major issue. Light bulb, telephone, etc...
FWIW, here is how my FS41e is wired. I think the confusion may be a result of the fact that the mfg. is using a multi-purpose terminal block that is...
I second Roger's advice that nothing protects against a lightning strike. In a bad electrical storm I unplug the expensive machines in my shop. Can't...