IPT Rigger 1 Practice Exam

The design factor is the safety margin used when selecting rope for lifting people. It’s calculated as the rope’s minimum breaking strength divided by the maximum load you expect the rope to carry, including any sudden shocks or dynamic forces that happen during hoisting. For rotation-resistant rope used to hoist personnel, the standard practice is a design factor of ten to one. That means the rope’s strength should be at least ten times the highest load it will encounter, giving enough cushion for dynamic effects, wear, and potential faults. The other options would provide smaller margins that aren’t considered adequate for life-critical hoisting, while a much larger factor (like twelve to one) is usually more conservative than typical requirements unless a specific standard calls for it.