Pick a unit whose Safe Working Load exceeds your maximum pull force by at least 20–30%. Consider conductor type, span length, and extra loads (wind/ice). Don’t forget friction losses from OHTLstringingequipment.com/Stringing-Blocks--Sheaves.html target='_blank'>Stringing Blocks; include those in your calculations. This safety margin covers dynamic effects during pulls and ensures the machine isn’t overloaded.