When is it safe to get in between the two sections of an articulating machine?

Getting in between the two sections of an articulating machine is only safe when the machine is turned off and the locking device is in place. This is crucial for ensuring the safety of the personnel involved. When the machine is off, it eliminates the risk of accidental movement, which could lead to serious injuries.

Additionally, the locking device functions as an essential safety mechanism that prevents the articulating sections from moving while someone is in the potentially dangerous space between them. Without the machine being completely powered down and securely locked, there remains a risk of unintended activation, making it hazardous to be in that area.

The other choices imply situations where safety is not guaranteed. For instance, having the machine turned on or simply parked does not ensure that it won’t move, and relying on the presence of an operator does not eliminate the risks associated with the machine potentially being unintentionally activated. Thus, the emphasis on both turning the machine off and utilizing the locking device is critical for safe operations within the articulating machine's sections.