Y limit switch labeled "Pr"

Didn’t know which category to put this in but a few simple questions. I attempted to install the new cable for my Ray5 10W laser after adding the limit switches - but there seems to be in incompatibility with the cable I received and a picture was sent to me by Longer. What is a cable marked “Pr” for? What marked cable goes into the “fall protection” socket/connector on the controller board? What marked cable goes into the “flame sensor” socket/connector - is that the Pr marked cable? Appreciate any detailed response(s).

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