What is required for a trench that is at least 4 feet deep?

For a trench that is at least 4 feet deep, it is essential to ensure the safety of workers who may be entering the trench. While a ladder is indeed a component of safe trench practices, the requirement that specifically addresses the stability and safety of the trench itself is the implementation of a shoring system, sloping support, or a trench box.

A ladder is primarily used for access and egress from the trench and can help in situations where workers need to climb in and out safely. However, in the context of ensuring the structural integrity of the trench walls and preventing cave-ins, additional safety measures like a shoring system or trench box are necessary. These methods provide support to the walls of the trench to prevent them from collapsing, which is a critical safety requirement for trenches that are deeper than 4 feet.

In this case, while a ladder may be used in a trench of that depth, relying solely on it does not meet the safety standards required for such environments. The correct consideration involves the need for systems specifically designed to counteract the risks of trench collapses, making the need for a shoring system, trench box, or sloping support paramount for protecting workers.