Trenching and Excavating Safety: Key Rules to Stay Safe
Trenching and excavating work can be dangerous, with an average of two workers killed monthly in trench collapses. To ensure safety, the AGC Self Insurers’ Fund outlines critical trenching safety rules in their “Trenching and Excavating Rules by the Numbers” flyer. Here’s a quick summary of the key regulations every worker should know:
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The 18-Inch Rule: When combining sloping with protective systems, shoring or shielding must extend at least 18 inches above the trench’s vertical side to enhance stability.
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The 2-Foot Rule: Keep soil piles and heavy equipment at least 2 feet from the trench edge to prevent cave-ins and crushing injuries.
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The 4-Foot Rule: Trenches 4 feet or deeper must have safe access and egress, such as ladders or ramps, located within 25 feet of workers for quick emergency exits.
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The 5-Foot Rule: Trenches 5 feet or deeper require protective systems (sloping, shoring, or shielding) unless in stable rock. A competent person may waive this for shallower trenches if deemed safe.
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The 20-Foot Rule: Trenches 20 feet or deeper need protective systems designed by a registered professional engineer.
While a designated competent person handles formal trench inspections, all employees should stay vigilant and report any safety concerns to their supervisor. For more details on trenching safety, consult your supervisor or refer to the full flyer.