For a trench that is 2 feet deep, 2 feet wide, and 40 feet long, OSHA regulations generally do not require protective systems such as shoring or trench boxes, as these are typically mandated for trenches deeper than 5 feet. However, it is important to ensure that the trench is safe for workers, even at this depth. Here are some key considerations:

1. Surface Encumbrances: Ensure that any surface encumbrances that could pose a hazard to employees are removed or supported to safeguard employees [1].

2. Underground Installations: Before starting excavation, determine the location of any underground utilities to avoid accidental damage [1].

3. Spoil Piles: Keep excavated materials at least 2 feet away from the edge of the trench to prevent them from falling back in [2].

4. Access and Egress: Although not required for trenches less than 4 feet deep, consider providing a safe means of entry and exit, such as a ladder, if workers need to enter the trench [3].

5. Inspection: Conduct daily inspections of the trench and surrounding areas for signs of potential hazards, such as cave-ins or hazardous atmospheres, especially after rain or other events that could affect trench stability [4].

While protective systems are not required for a trench of this depth, maintaining general safety practices is crucial to ensure worker safety.