Why should descent devices be locked off?

The rationale for locking off descent devices primarily revolves around safety, specifically to prevent accidental slippage. When a descent device is properly locked off, it ensures that the rope is securely held in place, minimizing the risk of unintentional movement that could lead to a fall. In rope access work, maintaining control over the descent is critical, as even minor errors can lead to significant safety hazards. By locking off a descent device, technicians can ensure that they have full control, allowing them to make calculated movements while securing themselves effectively.

While maintaining operational integrity, achieving rapid descents, and simplifying rope management are important considerations, the key focus here is the heightened safety that comes from preventing unintended rope movement during a descent.