Which of the following is a requirement for all portable, power-driven circular saws?

The requirement for all portable, power-driven circular saws to have guards equipped above and below the base plate is crucial for ensuring operator safety. These guards serve as protective barriers that help prevent accidental contact with the blade while the saw is in use, minimizing the risk of cuts, lacerations, or other injuries. The upper guard shields the operator from the upper part of the blade, especially when the saw is raised, while the lower guard protects against hazards from the underside, particularly when the base plate is lowered to the work surface.

Guard requirements are consistent with safety regulations that aim to minimize exposure to moving parts, ensuring that operators can use the equipment safely while maintaining full control. This precaution is essential, given that circular saws are powerful tools that can cause severe harm, making effective guarding a fundamental safety feature in their design and operation.