It's two feet (610cm) but the safety system depends on what kind and use of catwalk
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7 mm
The answers depend on the tool with which you measure the width and length: W and L units. Find the smallest unit you can measure with the tool, e units. Then maximum width = W + e/2 units, minimum width = W - e/2 units, maximum length = L + e/2 units, minimum length = L - e/2 units.
36 feet
First, you decide how many intervals you need. (Can be between 5-15). Then, you find the range (Max-Min=Range) Next you divide the range by the amount of intervals you wanted. The quotient is the width of your data Example: Intervals(Width=10 and Minimum=28)(When you add the width to the minimum, you should count the minimum too. Instead of 28+10=38, it would be 37 since the 28 count, and to check the answer you have to add ten going down) 28-37 38-47 48-57 58-67 68-77
The height of scaffold tower is four (4) times the minimum base width.