What is a block-and-tackle assembly used for in rigging?

A block-and-tackle assembly is a system of pulleys and ropes used primarily to lift heavy loads, effectively making the lifting process easier and more manageable. The correct answer highlights that this assembly does not directly calculate the wire rope's breaking strength but rather facilitates the lifting of loads by distributing weight and allowing for reduced physical effort.

The assembly works by using multiple pulleys to create a mechanical advantage, meaning that for a given load, the amount of force required to lift it is significantly decreased. Although knowing the breaking strength of the wire rope is essential for safety in rigging, it is not an application of the block-and-tackle assembly itself.

The purpose of a block-and-tackle assembly is primarily to enhance lifting efficiency and to allow one person to lift heavy items that otherwise would require multiple workers. Therefore, when considering its application in rigging, its role is not focused on stabilizing loads, calculating breaking strengths, or securing loads during transport, but rather on optimizing the lifting process.