Which type of safeguarding strategy is prohibited for a full-revolution press?

The correct answer identifies the presence-sensing device as a safeguarding strategy that is prohibited for full-revolution presses. This is due to the operational characteristics of full-revolution presses, which can complete a full cycle of operation, including the point of risk, regardless of whether an operator is still in the danger zone.

Presence-sensing devices are designed to detect the presence of a person in a hazardous area and typically stop the equipment to prevent injury. However, in the case of full-revolution presses, the mechanical nature of their operation means that even if a person interrupts the sensing field, the press may not stop in time to prevent injury, because it is already in motion. This lack of immediate reaction creates a significant safety risk.

Other safeguarding strategies, such as fixed barriers, two-hand controls, and pullback devices, are considered appropriate for full-revolution presses because they effectively minimize risk. Fixed barriers provide a physical obstruction that prevents access to the dangerous areas of the machinery during operation. Two-hand controls require the use of both hands to operate the machine, keeping the operator's hands away from the danger zone while the machine cycles. Pullback devices allow the operator's hands to be withdrawn from the danger zone before the press cycles. Each of these