After exposing a trench for direct buried cables, what should be added first?

The correct choice is to add 3-4 inches of soft bedding first after exposing a trench for direct buried cables. Soft bedding is essential as it provides a protective cushion for the cables, ensuring that they are shielded from rocks and sharp objects that could potentially damage the insulation or the conductors. This layer serves to evenly distribute the weight of the soil above and minimizes the risk of pressure points which could lead to cable failure.

Using soft bedding establishes a stable environment for the cables and is a critical step in maintaining the integrity and function of the electrical installation. It prepares the trench for the proper burial of the cables without compromising their safety or durability.