What protective measure should be in place at switch throws to guard against moving trips?

The use of shelter holes as a protective measure at switch throws is important because these designated areas offer a safe space for personnel to retreat in the event of an unexpected movement or operation of the trip mechanism. Shelter holes provide physical protection from potential hazards associated with the equipment's movement, ensuring that workers are shielded from injury while they are engaged in operational tasks near switch throws.

In contrast, warning lights could alert personnel about hazardous conditions but do not physically protect them; safety cones might help to demarcate areas but do not provide shelter. Emergency stop buttons serve important functions in halting equipment operation, yet they rely on someone being present and aware enough to activate them before an issue occurs. Shelter holes uniquely combine the aspect of safety by offering a reliable retreat point, enhancing worker safety significantly in high-risk environments like those near switch throws.