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Your crew is inside the trench box. The sidewalls are protected. Everything looks secure. But what about the open ends? A trench shield can protect workers from collapsing sidewalls while leaving them exposed to soil falling or sliding into the box from either end....

A trench box does not have one universal maximum depth. Its allowable depth depends on soil conditions, trench depth, surcharge loads, and the manufacturer’s tabulated data. A box that can be used deeper in stable soil may have a much lower allowable depth in weaker...