Which is a requirement for scaffolds when using outriggers?

When using outriggers for scaffolds, the requirement that scaffolds must not exceed a ratio of 4:1 is essential for maintaining stability and safety. This ratio pertains to the height of the scaffold in relation to its base width; specifically, it indicates that for every four feet of height, the base should extend one foot outward. This guideline ensures that the scaffold remains balanced and reduces the risk of tipping, thus protecting workers who rely on the scaffold for access to elevated areas. Adhering to the 4:1 ratio is a critical aspect of scaffold safety standards, as it promotes structural integrity and supports safe working conditions on job sites.