Ive never understood the 6 ft rule any way if there is large attic space with lots of head room in the area of the scuttle and a person wants to deck it there are not going to stop at 6 ft , what purpose is it to draw the line at 6 ft. it is like wise just as stupid to say if you have a permanent stairs no wire can be on top of the joists all the way over to the plate where the heigth is zero and on trusses there are a mase of braces to even get over there, I think the old rule on the height of 3 ft or less does not have to be protected unless with in 6 ft of opening was the best, when i say heigth IM refering to the clearence in the attic crawl space , not the placing of a cable