Thecorrect angle for a ladder is 75 degrees or the 1 in 4 rule. (see figure 6) Again, refer to manufacturers instructions and risk assessment before any set up of a ladder. Other factors to be considered in relation to set up are: supporting Followingthese guidelines will reduce your risk when working with ladders. Choose the right ladder, inspect it, set it up properly and climb safe. Dave Francis is the national safety director for Little Giant Ladders and holds five U.S. patents for ladder design. Reach him at dave@ 801-362-8586. The4-to-1 rule is a ladder safety rule. It states that four every 4 feet you climb up a ladder, you should move the ladder 1 foot away from the wall or vertical Thesafe ratio is determined by the ladder’s height and its distance from the wall or support. A common rule of thumb is the 4-to-1 ratio, where for every 4 units in ladder height, the ladder’s base should be 1 unit away from the wall. Different types of ladders require slightly different safe ratios due to their designs. Usethe Pythagorean theorem to calculate the hypotenuse from the right triangle sides. Take a square root of sum of squares: c = √ (a² + b²) Given an angle and one leg. c = a / sin (α) = b / sin (β), explained in Good Ladder Logic is a graphical based industrial programming language used to program and configure Programmable Logic Controllers, or PLC’s. Ladder programs consist of rungs that house instructions. Once compiled and downloaded to a PLC the ladder program is scanned like a book; from top-to-bottom, left-to-right. highif your knees are above top cap of the stepladder or if you cannot maintain a handhold on the ladder. Maintain a firm grip. Use both hands when climbing. Keep both feet on the ladder. Do not stand on a ladder and other object at the same time (for example, 1 foot on the ladder and 1 foot on anther object). Yourmaterials describe three "lock-pin" scaffold models. They are nominally 4 feet long by 26 inches wide, 6 feet long by 29 inches wide, and 7 feet long by 40 inches wide. We will refer to them respectively as the 4-foot, 6-foot and 7-foot models. II. Use of the scaffolds when no one is on them while they are moved Not using outriggers NaFCvcb.