In any trench over 4 feet deep, how often must ladders be placed?

In a trench that exceeds a depth of 4 feet, the requirement for ladder placement is crucial for maintaining safety standards. According to OSHA regulations, ladders must be provided to ensure that workers can safely enter and exit the trench. Specifically, ladders should be placed at intervals that allow for quick and easy access, minimizing the risk of falls or injuries.

The correct choice, which calls for ladders to be placed every 25 feet, aligns with these safety regulations. This interval is designed to ensure that workers have access to a means of escape in the event of an emergency, supporting safe work practices in potentially hazardous conditions.

The other options do not reflect the standard practice recommended for safety in deep trench work. For example, placing ladders every 15 feet or every 50 feet would not provide the same level of accessibility, and every 75 feet would be too infrequent, potentially compromising worker safety in emergency situations. By adhering to the 25-foot requirement, the regulations aim to enhance worker safety and reduce the likelihood of accidents in deep trenches.