Which factor is NOT part of the equation for determining the load capacity of a chain?

The determination of a chain's load capacity is primarily influenced by a few critical factors that relate directly to the chain and its application in rigging. Among these, the type of load, chain grade, and the number of legs in a sling are essential parameters.

The type of load dictates how weight is distributed through the rigging system and can affect the dynamics of the lift. Different loads (such as static, dynamic, or shock loading) require different considerations.

The chain grade is vital because it indicates the strength and safety factors of the chain. Higher grade chains are designed to handle greater loads, so knowing the grade helps assess how much weight a particular chain can safely bear.

The number of legs in a sling is also significant, as this affects the overall load distribution and stability of the rigging. More legs can allow the system to spread the weight and reduce strain on each individual component.

Weather conditions, while potentially influencing performance and safety (such as freezing temperatures impacting the flexibility of the chain or the visibility for rigging crews), are not a component in the actual calculation of a chain’s load capacity. Hence, this factor is not part of the fundamental equation for determining how much load a chain can handle.