When repelling with a brake bar rack, how many bars should be engaged before loading the rope for descent?

When using a brake bar rack for repelling, it is important to ensure adequate safety through the engagement of multiple bars before loading the rope for descent. Engaging four bars creates a friction system that significantly enhances control over the descent speed. This setup allows for a safer and smoother descent, reducing the risk of uncontrolled falls and increasing the ability to manage the braking effect on the rope.

The rationale behind this requirement also stems from the need to account for variations in rope conditions, the weight of the person descending, and the desired descent speed. By using four bars, a sturdy and reliable braking mechanism is established, which can accommodate these variables effectively.

While fewer bars can be used in some situations, such as when dealing with lighter loads or specific conditions, four bars provide an ideal balance of control and safety for the majority of repelling operations.