At what depth must a ladder or climbing device be used to enter a manhole or vault?

The appropriate depth at which a ladder or climbing device is required for entering a manhole or vault is determined by safety regulations to prevent accidents during entry. A depth of 4 feet is significant because it marks the point where the potential for falls increases, thus necessitating the use of a ladder or climbing device to provide safe access and egress. This requirement aims to ensure that workers can safely enter and exit the confined space, maintaining compliance with safety standards and reducing the risk of injury.

When the depth exceeds 4 feet, the use of a climbing device helps facilitate safe movement, reduces the risk of slips or falls, and complies with standard safety practices in environments that may pose hazards when working at various depths.