How many pieces of checkered plate can be lifted when using plate grabs?

The capacity to lift a specific number of checkered plates with plate grabs is primarily influenced by safety regulations and the design capabilities of the lifting devices. Plate grabs are typically designed to securely hold and lift a single plate at a time. This ensures that the weight is evenly distributed and that the integrity of the lifted item remains intact during transport.

When lifting multiple plates, the risk of instability and the potential for slippage or mishandling increases, which can lead to accidents or damage. Therefore, lifting no more than one plate with plate grabs aligns with industry best practices aimed at maximizing safety and minimizing the risk of injury or equipment failure.

In contrast, the other choices suggest lifting two, three, or four plates, which exceeds the standard safety protocols associated with using plate grabs. Such practices could result in dangerous scenarios where the plates could come loose, leading to serious consequences for the operators and surrounding personnel.