In this case, it would mean at least three paragraphs + a short 'error message'. Something like:
short error: This cable isn't connected to anything
first paragraph: explanation of how to check for unconnected cables manually (we have a 'zoom to' button but sometimes things look connected but actually aren't because they're e.g. on the wrong map layer in the drawing, so edge cases like that go in here too)
second paragraph: quotes from standards and rulebooks, explaining that cables always need to be connected, and the list of things they can be connected to. If you leave this out, contract…