Is it permissible to undercut the sides of a trench?

Undercutting the sides of a trench is not permissible because it significantly increases the risk of collapse. When the sides of a trench are undercut, the structural integrity is compromised, which can lead to sudden cave-ins. Safety regulations, such as those from OSHA, emphasize that trenches must have sloped or vertical sides that are adequately supported to prevent accidents.

While certain safety methods, such as shoring or other protective systems, can help mitigate risks in trenches, the act of undercutting itself is inherently hazardous and not a safe practice. This underscores the importance of maintaining proper trench walls to ensure the safety of workers and compliance with established safety standards.