According to OSHA standards, what is the minimum number of vertical shores that must be used evenly spaced in a group?

The minimum number of vertical shores required to be used evenly spaced in a group, as specified by OSHA standards, is three. This requirement is in place to ensure adequate support for the excavation and to minimize the risk of cave-ins, which can occur in unstable soil conditions.

Using three vertical shores allows for better distribution of weight and forces acting on the excavation site. It creates a more robust support system, effectively managing lateral earth pressures and contributing to overall site safety. This spacing helps maintain stability and integrity within the excavation, making it crucial for protecting workers from potential hazards associated with excavation work.

While additional shores may enhance safety further, the requirement of three ensures that at a minimum level, the excavation is supported sufficiently to prevent collapse, in line with OSHA’s focus on safety in excavations.