daba, I'm not looking to be overly cantankerous here, but I disagree (again). There is no ambiguity about the text description of the system. I'm not sure about everywhere else, but relay ladder diagrams were littered with NOHC (normally open held closed) and NCHO references. It was the cue to the user about the orientation of the switch so there was no confusion about how it was intended to operate. I do agree with Steve that the switch drawing should have had the NOHC reference and should have been shown as such. But other than that I don't see a problem with it. This is probably because I have seen it my fair share of this in "the wild".
Which brings up the next point. If I have seen this in the field, at some point so will Rocguy. Better he sees it in class than sitting on a 100 degree shop floor with a plant manager hanging over his shoulder. Furthermore, one of the recurring complaints that ends up on this site is how new automation professionals can pass any book test put in front of them but they can't think their way out of a paper bag. The common consensus is that teachers aren't challenging them with real world problems. So we have this case. A problem was put in front of a class. Rocguy evaluated the information given, found what he thought was a discrepancy and searched out information to help him clear it up. Isn't that what we want our education system to force our students to do? The only unknown to me at this point is what the instructor would do with this case given an incorrect evaluation.
I do agree that the unactuated comment is unnecessary. But I would also say, look back at post #5 at your own description of what "actuated" and "unactuated" mean. By your own definition, the switches are shown in the unactuated position. Its just that in this case the up limit switch is unactuated when the door is in the full open position.
Which, by the way, highlights another lesson. Don't infer unless you absolutely have to. You allowed a personal bias to influence your evaluation; that bias being that the up switch would be "actuated" when the door was fully open. Nothing in any of the information given to you said that was the case. You inferred that the up switch was actuated by the opening door based on your personal experience, like most of us would. But fight the urge. It can sometimes lead you down a rabbit hole.
Keith